granicus.if.org Git - imagemagick/blob - coders/png.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            PPPP   N   N   GGGG                              %
   7 %                            P   P  NN  N  G                                  %
   8 %                            PPPP   N N N  G  GG                              %
   9 %                            P      N  NN  G   G                              %
  10 %                            P      N   N   GGG                               %
  11 %                                                                             %
  12 %                                                                             %
  13 %              Read/Write Portable Network Graphics Image Format              %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                           Glenn Randers-Pehrson                             %
  18 %                               November 1997                                 %
  19 %                                                                             %
  20 %                                                                             %
  21 %  Copyright 1999-2011 ImageMagick Studio LLC, a non-profit organization      %
  22 %  dedicated to making software imaging solutions freely available.           %
  23 %                                                                             %
  24 %  You may not use this file except in compliance with the License.  You may  %
  25 %  obtain a copy of the License at                                            %
  26 %                                                                             %
  27 %    http://www.imagemagick.org/script/license.php                            %
  28 %                                                                             %
  29 %  Unless required by applicable law or agreed to in writing, software        %
  30 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  31 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  32 %  See the License for the specific language governing permissions and        %
  33 %  limitations under the License.                                             %
  34 %                                                                             %
  35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  36 %
  37 %
  38 */
  39
  40 \f
  41 /*
  42   Include declarations.
  43 */
  44 #include "magick/studio.h"
  45 #include "magick/artifact.h"
  46 #include "magick/attribute.h"
  47 #include "magick/blob.h"
  48 #include "magick/blob-private.h"
  49 #include "magick/cache.h"
  50 #include "magick/color.h"
  51 #include "magick/color-private.h"
  52 #include "magick/colormap.h"
  53 #include "magick/colorspace.h"
  54 #include "magick/constitute.h"
  55 #include "magick/enhance.h"
  56 #include "magick/exception.h"
  57 #include "magick/exception-private.h"
  58 #include "magick/geometry.h"
  59 #include "magick/histogram.h"
  60 #include "magick/image.h"
  61 #include "magick/image-private.h"
  62 #include "magick/layer.h"
  63 #include "magick/list.h"
  64 #include "magick/log.h"
  65 #include "magick/magick.h"
  66 #include "magick/memory_.h"
  67 #include "magick/module.h"
  68 #include "magick/monitor.h"
  69 #include "magick/monitor-private.h"
  70 #include "magick/option.h"
  71 #include "magick/quantum-private.h"
  72 #include "magick/profile.h"
  73 #include "magick/property.h"
  74 #include "magick/resource_.h"
  75 #include "magick/semaphore.h"
  76 #include "magick/quantum-private.h"
  77 #include "magick/static.h"
  78 #include "magick/statistic.h"
  79 #include "magick/string_.h"
  80 #include "magick/string-private.h"
  81 #include "magick/transform.h"
  82 #include "magick/utility.h"
  83 #if defined(MAGICKCORE_PNG_DELEGATE)
  84
  85 /* Suppress libpng pedantic warnings that were added in
  86  * libpng-1.2.41 and libpng-1.4.0.  If you are working on
  87  * migration to libpng-1.5, remove these defines and then
  88  * fix any code that generates warnings.
  89  */
  90 /* #define PNG_DEPRECATED   Use of this function is deprecated */
  91 /* #define PNG_USE_RESULT   The result of this function must be checked */
  92 /* #define PNG_NORETURN     This function does not return */
  93 /* #define PNG_ALLOCATED    The result of the function is new memory */
  94 /* #define PNG_DEPSTRUCT    Access to this struct member is deprecated */
  95
  96 #include "png.h"
  97 #include "zlib.h"
  98 \f
  99 /* ImageMagick differences */
 100 #define first_scene scene
 101
 102 #if PNG_LIBPNG_VER > 10011
 103 /*
 104   Optional declarations. Define or undefine them as you like.
 105 */
 106 /* #define PNG_DEBUG -- turning this on breaks VisualC compiling */
 107
 108 /*
 109   Features under construction.  Define these to work on them.
 110 */
 111 #undef MNG_OBJECT_BUFFERS
 112 #undef MNG_BASI_SUPPORTED
 113 #define MNG_COALESCE_LAYERS /* In 5.4.4, this interfered with MMAP'ed files. */
 114 #define MNG_INSERT_LAYERS   /* Troublesome, but seem to work as of 5.4.4 */
 115 #define BUILD_PNG_PALETTE   /* This works as of 6.6.6 */
 116 #if defined(MAGICKCORE_JPEG_DELEGATE)
 117 #  define JNG_SUPPORTED /* Not finished as of 5.5.2.  See "To do" comments. */
 118 #endif
 119 #if !defined(RGBColorMatchExact)
 120 #define IsPNGColorEqual(color,target) \
 121    (((color).red == (target).red) && \
 122     ((color).green == (target).green) && \
 123     ((color).blue == (target).blue))
 124 #endif
 125
 126 /*
 127   Establish thread safety.
 128   setjmp/longjmp is claimed to be safe on these platforms:
 129   setjmp/longjmp is alleged to be unsafe on these platforms:
 130 */
 131 #ifndef SETJMP_IS_THREAD_SAFE
 132 #define PNG_SETJMP_NOT_THREAD_SAFE
 133 #endif
 134
 135 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
 136 static SemaphoreInfo
 137   *ping_semaphore = (SemaphoreInfo *) NULL;
 138 #endif
 139
 140 /*
 141   This temporary until I set up malloc'ed object attributes array.
 142   Recompile with MNG_MAX_OBJECTS=65536L to avoid this limit but
 143   waste more memory.
 144 */
 145 #define MNG_MAX_OBJECTS 256
 146
 147 /*
 148   If this not defined, spec is interpreted strictly.  If it is
 149   defined, an attempt will be made to recover from some errors,
 150   including
 151       o global PLTE too short
 152 */
 153 #undef MNG_LOOSE
 154
 155 /*
 156   Don't try to define PNG_MNG_FEATURES_SUPPORTED here.  Make sure
 157   it's defined in libpng/pngconf.h, version 1.0.9 or later.  It won't work
 158   with earlier versions of libpng.  From libpng-1.0.3a to libpng-1.0.8,
 159   PNG_READ|WRITE_EMPTY_PLTE were used but those have been deprecated in
 160   libpng in favor of PNG_MNG_FEATURES_SUPPORTED, so we set them here.
 161   PNG_MNG_FEATURES_SUPPORTED is disabled by default in libpng-1.0.9 and
 162   will be enabled by default in libpng-1.2.0.
 163 */
 164 #ifdef PNG_MNG_FEATURES_SUPPORTED
 165 #  ifndef PNG_READ_EMPTY_PLTE_SUPPORTED
 166 #    define PNG_READ_EMPTY_PLTE_SUPPORTED
 167 #  endif
 168 #  ifndef PNG_WRITE_EMPTY_PLTE_SUPPORTED
 169 #    define PNG_WRITE_EMPTY_PLTE_SUPPORTED
 170 #  endif
 171 #endif
 172
 173 /*
 174   Maximum valid size_t in PNG/MNG chunks is (2^31)-1
 175   This macro is only defined in libpng-1.0.3 and later.
 176   Previously it was PNG_MAX_UINT but that was deprecated in libpng-1.2.6
 177 */
 178 #ifndef PNG_UINT_31_MAX
 179 #define PNG_UINT_31_MAX (png_uint_32) 0x7fffffffL
 180 #endif
 181
 182 /*
 183   Constant strings for known chunk types.  If you need to add a chunk,
 184   add a string holding the name here.   To make the code more
 185   portable, we use ASCII numbers like this, not characters.
 186 */
 187
 188 static png_byte FARDATA mng_MHDR[5]={ 77,  72,  68,  82, (png_byte) '\0'};
 189 static png_byte FARDATA mng_BACK[5]={ 66,  65,  67,  75, (png_byte) '\0'};
 190 static png_byte FARDATA mng_BASI[5]={ 66,  65,  83,  73, (png_byte) '\0'};
 191 static png_byte FARDATA mng_CLIP[5]={ 67,  76,  73,  80, (png_byte) '\0'};
 192 static png_byte FARDATA mng_CLON[5]={ 67,  76,  79,  78, (png_byte) '\0'};
 193 static png_byte FARDATA mng_DEFI[5]={ 68,  69,  70,  73, (png_byte) '\0'};
 194 static png_byte FARDATA mng_DHDR[5]={ 68,  72,  68,  82, (png_byte) '\0'};
 195 static png_byte FARDATA mng_DISC[5]={ 68,  73,  83,  67, (png_byte) '\0'};
 196 static png_byte FARDATA mng_ENDL[5]={ 69,  78,  68,  76, (png_byte) '\0'};
 197 static png_byte FARDATA mng_FRAM[5]={ 70,  82,  65,  77, (png_byte) '\0'};
 198 static png_byte FARDATA mng_IEND[5]={ 73,  69,  78,  68, (png_byte) '\0'};
 199 static png_byte FARDATA mng_IHDR[5]={ 73,  72,  68,  82, (png_byte) '\0'};
 200 static png_byte FARDATA mng_JHDR[5]={ 74,  72,  68,  82, (png_byte) '\0'};
 201 static png_byte FARDATA mng_LOOP[5]={ 76,  79,  79,  80, (png_byte) '\0'};
 202 static png_byte FARDATA mng_MAGN[5]={ 77,  65,  71,  78, (png_byte) '\0'};
 203 static png_byte FARDATA mng_MEND[5]={ 77,  69,  78,  68, (png_byte) '\0'};
 204 static png_byte FARDATA mng_MOVE[5]={ 77,  79,  86,  69, (png_byte) '\0'};
 205 static png_byte FARDATA mng_PAST[5]={ 80,  65,  83,  84, (png_byte) '\0'};
 206 static png_byte FARDATA mng_PLTE[5]={ 80,  76,  84,  69, (png_byte) '\0'};
 207 static png_byte FARDATA mng_SAVE[5]={ 83,  65,  86,  69, (png_byte) '\0'};
 208 static png_byte FARDATA mng_SEEK[5]={ 83,  69,  69,  75, (png_byte) '\0'};
 209 static png_byte FARDATA mng_SHOW[5]={ 83,  72,  79,  87, (png_byte) '\0'};
 210 static png_byte FARDATA mng_TERM[5]={ 84,  69,  82,  77, (png_byte) '\0'};
 211 static png_byte FARDATA mng_bKGD[5]={ 98,  75,  71,  68, (png_byte) '\0'};
 212 static png_byte FARDATA mng_cHRM[5]={ 99,  72,  82,  77, (png_byte) '\0'};
 213 static png_byte FARDATA mng_gAMA[5]={103,  65,  77,  65, (png_byte) '\0'};
 214 static png_byte FARDATA mng_iCCP[5]={105,  67,  67,  80, (png_byte) '\0'};
 215 static png_byte FARDATA mng_nEED[5]={110,  69,  69,  68, (png_byte) '\0'};
 216 static png_byte FARDATA mng_pHYg[5]={112,  72,  89, 103, (png_byte) '\0'};
 217 static png_byte FARDATA mng_vpAg[5]={118, 112,  65, 103, (png_byte) '\0'};
 218 static png_byte FARDATA mng_pHYs[5]={112,  72,  89, 115, (png_byte) '\0'};
 219 static png_byte FARDATA mng_sBIT[5]={115,  66,  73,  84, (png_byte) '\0'};
 220 static png_byte FARDATA mng_sRGB[5]={115,  82,  71,  66, (png_byte) '\0'};
 221 static png_byte FARDATA mng_tRNS[5]={116,  82,  78,  83, (png_byte) '\0'};
 222
 223 #if defined(JNG_SUPPORTED)
 224 static png_byte FARDATA mng_IDAT[5]={ 73,  68,  65,  84, (png_byte) '\0'};
 225 static png_byte FARDATA mng_JDAT[5]={ 74,  68,  65,  84, (png_byte) '\0'};
 226 static png_byte FARDATA mng_JDAA[5]={ 74,  68,  65,  65, (png_byte) '\0'};
 227 static png_byte FARDATA mng_JdAA[5]={ 74, 100,  65,  65, (png_byte) '\0'};
 228 static png_byte FARDATA mng_JSEP[5]={ 74,  83,  69,  80, (png_byte) '\0'};
 229 static png_byte FARDATA mng_oFFs[5]={111,  70,  70, 115, (png_byte) '\0'};
 230 #endif
 231
 232 /*
 233 Other known chunks that are not yet supported by ImageMagick:
 234 static png_byte FARDATA mng_hIST[5]={104,  73,  83,  84, (png_byte) '\0'};
 235 static png_byte FARDATA mng_iCCP[5]={105,  67,  67,  80, (png_byte) '\0'};
 236 static png_byte FARDATA mng_iTXt[5]={105,  84,  88, 116, (png_byte) '\0'};
 237 static png_byte FARDATA mng_sPLT[5]={115,  80,  76,  84, (png_byte) '\0'};
 238 static png_byte FARDATA mng_sTER[5]={115,  84,  69,  82, (png_byte) '\0'};
 239 static png_byte FARDATA mng_tEXt[5]={116,  69,  88, 116, (png_byte) '\0'};
 240 static png_byte FARDATA mng_tIME[5]={116,  73,  77,  69, (png_byte) '\0'};
 241 static png_byte FARDATA mng_zTXt[5]={122,  84,  88, 116, (png_byte) '\0'};
 242 */
 243
 244 typedef struct _MngBox
 245 {
 246   long
 247     left,
 248     right,
 249     top,
 250     bottom;
 251 } MngBox;
 252
 253 typedef struct _MngPair
 254 {
 255   volatile long
 256     a,
 257     b;
 258 } MngPair;
 259
 260 #ifdef MNG_OBJECT_BUFFERS
 261 typedef struct _MngBuffer
 262 {
 263
 264   size_t
 265     height,
 266     width;
 267
 268   Image
 269     *image;
 270
 271   png_color
 272     plte[256];
 273
 274   int
 275     reference_count;
 276
 277   unsigned char
 278     alpha_sample_depth,
 279     compression_method,
 280     color_type,
 281     concrete,
 282     filter_method,
 283     frozen,
 284     image_type,
 285     interlace_method,
 286     pixel_sample_depth,
 287     plte_length,
 288     sample_depth,
 289     viewable;
 290 } MngBuffer;
 291 #endif
 292
 293 typedef struct _MngInfo
 294 {
 295
 296 #ifdef MNG_OBJECT_BUFFERS
 297   MngBuffer
 298     *ob[MNG_MAX_OBJECTS];
 299 #endif
 300
 301   Image *
 302     image;
 303
 304   RectangleInfo
 305     page;
 306
 307   int
 308     adjoin,
 309 #ifndef PNG_READ_EMPTY_PLTE_SUPPORTED
 310     bytes_in_read_buffer,
 311     found_empty_plte,
 312 #endif
 313     equal_backgrounds,
 314     equal_chrms,
 315     equal_gammas,
 316 #if defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) || \
 317     defined(PNG_MNG_FEATURES_SUPPORTED)
 318     equal_palettes,
 319 #endif
 320     equal_physs,
 321     equal_srgbs,
 322     framing_mode,
 323     have_global_bkgd,
 324     have_global_chrm,
 325     have_global_gama,
 326     have_global_phys,
 327     have_global_sbit,
 328     have_global_srgb,
 329     have_saved_bkgd_index,
 330     have_write_global_chrm,
 331     have_write_global_gama,
 332     have_write_global_plte,
 333     have_write_global_srgb,
 334     need_fram,
 335     object_id,
 336     old_framing_mode,
 337     saved_bkgd_index;
 338
 339   int
 340     new_number_colors;
 341
 342   ssize_t
 343     image_found,
 344     loop_count[256],
 345     loop_iteration[256],
 346     scenes_found,
 347     x_off[MNG_MAX_OBJECTS],
 348     y_off[MNG_MAX_OBJECTS];
 349
 350   MngBox
 351     clip,
 352     frame,
 353     image_box,
 354     object_clip[MNG_MAX_OBJECTS];
 355
 356   unsigned char
 357     /* These flags could be combined into one byte */
 358     exists[MNG_MAX_OBJECTS],
 359     frozen[MNG_MAX_OBJECTS],
 360     loop_active[256],
 361     invisible[MNG_MAX_OBJECTS],
 362     viewable[MNG_MAX_OBJECTS];
 363
 364   MagickOffsetType
 365     loop_jump[256];
 366
 367   png_colorp
 368     global_plte;
 369
 370   png_color_8
 371     global_sbit;
 372
 373   png_byte
 374 #ifndef PNG_READ_EMPTY_PLTE_SUPPORTED
 375     read_buffer[8],
 376 #endif
 377     global_trns[256];
 378
 379   float
 380     global_gamma;
 381
 382   ChromaticityInfo
 383     global_chrm;
 384
 385   RenderingIntent
 386     global_srgb_intent;
 387
 388   unsigned int
 389     delay,
 390     global_plte_length,
 391     global_trns_length,
 392     global_x_pixels_per_unit,
 393     global_y_pixels_per_unit,
 394     mng_width,
 395     mng_height,
 396     ticks_per_second;
 397
 398   MagickBooleanType
 399     need_blob;
 400
 401   unsigned int
 402     IsPalette,
 403     global_phys_unit_type,
 404     basi_warning,
 405     clon_warning,
 406     dhdr_warning,
 407     jhdr_warning,
 408     magn_warning,
 409     past_warning,
 410     phyg_warning,
 411     phys_warning,
 412     sbit_warning,
 413     show_warning,
 414     mng_type,
 415     write_mng,
 416     write_png_colortype,
 417     write_png_depth,
 418     write_png8,
 419     write_png24,
 420     write_png32;
 421
 422 #ifdef MNG_BASI_SUPPORTED
 423   size_t
 424     basi_width,
 425     basi_height;
 426
 427   unsigned int
 428     basi_depth,
 429     basi_color_type,
 430     basi_compression_method,
 431     basi_filter_type,
 432     basi_interlace_method,
 433     basi_red,
 434     basi_green,
 435     basi_blue,
 436     basi_alpha,
 437     basi_viewable;
 438 #endif
 439
 440   png_uint_16
 441     magn_first,
 442     magn_last,
 443     magn_mb,
 444     magn_ml,
 445     magn_mr,
 446     magn_mt,
 447     magn_mx,
 448     magn_my,
 449     magn_methx,
 450     magn_methy;
 451
 452   PixelPacket
 453     mng_global_bkgd;
 454
 455   /* Added at version 6.6.6-7 */
 456   MagickBooleanType
 457     ping_exclude_bKGD,
 458     ping_exclude_cHRM,
 459     ping_exclude_EXIF,
 460     ping_exclude_gAMA,
 461     ping_exclude_iCCP,
 462     /* ping_exclude_iTXt, */
 463     ping_exclude_oFFs,
 464     ping_exclude_pHYs,
 465     ping_exclude_sRGB,
 466     ping_exclude_tEXt,
 467     ping_exclude_tRNS,
 468     ping_exclude_vpAg,
 469     ping_exclude_zCCP, /* hex-encoded iCCP */
 470     ping_exclude_zTXt;
 471
 472 } MngInfo;
 473 #endif /* VER */
 474 \f
 475 /*
 476   Forward declarations.
 477 */
 478 static MagickBooleanType
 479   WritePNGImage(const ImageInfo *,Image *);
 480
 481 static MagickBooleanType
 482   WriteMNGImage(const ImageInfo *,Image *);
 483
 484 #if defined(JNG_SUPPORTED)
 485 static MagickBooleanType
 486   WriteJNGImage(const ImageInfo *,Image *);
 487 #endif
 488
 489 #if PNG_LIBPNG_VER > 10011
 490
 491 #if (MAGICKCORE_QUANTUM_DEPTH >= 16)
 492 static MagickBooleanType
 493   LosslessReduceDepthOK(Image *image)
 494 {
 495     MagickBooleanType
 496       ok_to_reduce=MagickFalse;
 497
 498     /* Reduce bit depth if it can be reduced losslessly from 16 to 8.
 499      * Note that the method GetImageDepth doesn't check background
 500      * and doesn't handle PseudoClass specially.  Also it uses
 501      * multiplication and division by 257 instead of shifting, so
 502      * might be slower.
 503      */
 504
 505     if (image->depth == 16)
 506       {
 507
 508         const PixelPacket
 509           *p;
 510
 511         ok_to_reduce=
 512           (((((size_t) image->background_color.red >> 8) & 0xff)
 513           == ((size_t) image->background_color.red & 0xff)) &&
 514            ((((size_t) image->background_color.green >> 8) & 0xff)
 515           == ((size_t) image->background_color.green & 0xff)) &&
 516            ((((size_t) image->background_color.blue >> 8) & 0xff)
 517           == ((size_t) image->background_color.blue & 0xff))) ? MagickTrue :
 518           MagickFalse;
 519
 520         if (ok_to_reduce != MagickFalse && image->storage_class == PseudoClass)
 521           {
 522             int indx;
 523
 524             for (indx=0; indx < (ssize_t) image->colors; indx++)
 525               {
 526                 ok_to_reduce=(((((size_t) image->colormap[indx].red >>
 527                     8) & 0xff)
 528                   == ((size_t) image->colormap[indx].red & 0xff)) &&
 529                   ((((size_t) image->colormap[indx].green >> 8) & 0xff)
 530                   == ((size_t) image->colormap[indx].green & 0xff)) &&
 531                   ((((size_t) image->colormap[indx].blue >> 8) & 0xff)
 532                   == ((size_t) image->colormap[indx].blue & 0xff)) &&
 533                   (image->matte == MagickFalse ||
 534                   (((size_t) image->colormap[indx].opacity >> 8) & 0xff)
 535                   == ((size_t) image->colormap[indx].opacity & 0xff))) ?
 536                   MagickTrue : MagickFalse;
 537                 if (ok_to_reduce == MagickFalse)
 538                   break;
 539               }
 540           }
 541
 542         if ((ok_to_reduce != MagickFalse) &&
 543             (image->storage_class != PseudoClass))
 544           {
 545             ssize_t
 546               y;
 547
 548             register ssize_t
 549               x;
 550
 551             for (y=0; y < (ssize_t) image->rows; y++)
 552             {
 553               p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 554
 555               if (p == (const PixelPacket *) NULL)
 556                 {
 557                   ok_to_reduce = MagickFalse;
 558                   break;
 559                 }
 560
 561               for (x=(ssize_t) image->columns-1; x >= 0; x--)
 562               {
 563                 ok_to_reduce=((
 564                   (((size_t) p->red >> 8) & 0xff) ==
 565                   ((size_t) p->red & 0xff)) &&
 566                   ((((size_t) p->green >> 8) & 0xff) ==
 567                   ((size_t) p->green & 0xff)) &&
 568                   ((((size_t) p->blue >> 8) & 0xff) ==
 569                   ((size_t) p->blue & 0xff)) &&
 570                   (((image->matte == MagickFalse ||
 571                   (((size_t) p->opacity >> 8) & 0xff) ==
 572                   ((size_t) p->opacity & 0xff))))) ? MagickTrue : MagickFalse;
 573
 574                 if (ok_to_reduce == MagickFalse)
 575                   break;
 576
 577                 p++;
 578               }
 579               if (x >= 0)
 580                 break;
 581             }
 582           }
 583
 584         if (ok_to_reduce != MagickFalse)
 585           {
 586             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 587                 "  OK to reduce PNG bit depth to 8 without loss of info");
 588           }
 589         else
 590           {
 591             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 592                 "  Not OK to reduce PNG bit depth to 8 without loss of info");
 593           }
 594       }
 595
 596     return ok_to_reduce;
 597 }
 598 #endif /* MAGICKCORE_QUANTUM_DEPTH >= 16 */
 599
 600 static int
 601 Magick_RenderingIntent_to_PNG_RenderingIntent(const RenderingIntent intent)
 602 {
 603   switch (intent)
 604   {
 605     case PerceptualIntent:
 606        return 0;
 607
 608     case RelativeIntent:
 609        return 1;
 610
 611     case SaturationIntent:
 612        return 2;
 613
 614     case AbsoluteIntent:
 615        return 3;
 616
 617     default:
 618        return -1;
 619   }
 620 }
 621
 622 static RenderingIntent
 623 Magick_RenderingIntent_from_PNG_RenderingIntent(const int ping_intent)
 624 {
 625   switch (ping_intent)
 626   {
 627     case 0:
 628       return PerceptualIntent;
 629
 630     case 1:
 631       return RelativeIntent;
 632
 633     case 2:
 634       return SaturationIntent;
 635
 636     case 3:
 637       return AbsoluteIntent;
 638
 639     default:
 640       return UndefinedIntent;
 641     }
 642 }
 643
 644 static inline ssize_t MagickMax(const ssize_t x,const ssize_t y)
 645 {
 646   if (x > y)
 647     return(x);
 648
 649   return(y);
 650 }
 651
 652 static inline ssize_t MagickMin(const ssize_t x,const ssize_t y)
 653 {
 654   if (x < y)
 655     return(x);
 656
 657   return(y);
 658 }
 659
 660 \f
 661 /*
 662 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 663 %                                                                             %
 664 %                                                                             %
 665 %                                                                             %
 666 %   I m a g e I s G r a y                                                     %
 667 %                                                                             %
 668 %                                                                             %
 669 %                                                                             %
 670 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 671 %                                                                             %
 672 %   Like IsGrayImage except does not change DirectClass to PseudoClass        %
 673 %                                                                             %
 674 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 675 */
 676 static MagickBooleanType ImageIsGray(Image *image)
 677 {
 678   register const PixelPacket
 679     *p;
 680
 681   register ssize_t
 682     i,
 683     x,
 684     y;
 685
 686   assert(image != (Image *) NULL);
 687   assert(image->signature == MagickSignature);
 688   if (image->debug != MagickFalse)
 689     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 690
 691   if (image->storage_class == PseudoClass)
 692     {
 693       for (i=0; i < (ssize_t) image->colors; i++)
 694         if (IsGray(image->colormap+i) == MagickFalse)
 695           return(MagickFalse);
 696       return(MagickTrue);
 697     }
 698   for (y=0; y < (ssize_t) image->rows; y++)
 699   {
 700     p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 701     if (p == (const PixelPacket *) NULL)
 702       return(MagickFalse);
 703     for (x=(ssize_t) image->columns-1; x >= 0; x--)
 704     {
 705        if (IsGray(p) == MagickFalse)
 706           return(MagickFalse);
 707        p++;
 708     }
 709   }
 710   return(MagickTrue);
 711 }
 712 #endif /* PNG_LIBPNG_VER > 10011 */
 713 #endif /* MAGICKCORE_PNG_DELEGATE */
 714 \f
 715 /*
 716 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 717 %                                                                             %
 718 %                                                                             %
 719 %                                                                             %
 720 %   I s M N G                                                                 %
 721 %                                                                             %
 722 %                                                                             %
 723 %                                                                             %
 724 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 725 %
 726 %  IsMNG() returns MagickTrue if the image format type, identified by the
 727 %  magick string, is MNG.
 728 %
 729 %  The format of the IsMNG method is:
 730 %
 731 %      MagickBooleanType IsMNG(const unsigned char *magick,const size_t length)
 732 %
 733 %  A description of each parameter follows:
 734 %
 735 %    o magick: compare image format pattern against these bytes.
 736 %
 737 %    o length: Specifies the length of the magick string.
 738 %
 739 %
 740 */
 741 static MagickBooleanType IsMNG(const unsigned char *magick,const size_t length)
 742 {
 743   if (length < 8)
 744     return(MagickFalse);
 745
 746   if (memcmp(magick,"\212MNG\r\n\032\n",8) == 0)
 747     return(MagickTrue);
 748
 749   return(MagickFalse);
 750 }
 751 \f
 752 /*
 753 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 754 %                                                                             %
 755 %                                                                             %
 756 %                                                                             %
 757 %   I s J N G                                                                 %
 758 %                                                                             %
 759 %                                                                             %
 760 %                                                                             %
 761 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 762 %
 763 %  IsJNG() returns MagickTrue if the image format type, identified by the
 764 %  magick string, is JNG.
 765 %
 766 %  The format of the IsJNG method is:
 767 %
 768 %      MagickBooleanType IsJNG(const unsigned char *magick,const size_t length)
 769 %
 770 %  A description of each parameter follows:
 771 %
 772 %    o magick: compare image format pattern against these bytes.
 773 %
 774 %    o length: Specifies the length of the magick string.
 775 %
 776 %
 777 */
 778 static MagickBooleanType IsJNG(const unsigned char *magick,const size_t length)
 779 {
 780   if (length < 8)
 781     return(MagickFalse);
 782
 783   if (memcmp(magick,"\213JNG\r\n\032\n",8) == 0)
 784     return(MagickTrue);
 785
 786   return(MagickFalse);
 787 }
 788 \f
 789 /*
 790 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 791 %                                                                             %
 792 %                                                                             %
 793 %                                                                             %
 794 %   I s P N G                                                                 %
 795 %                                                                             %
 796 %                                                                             %
 797 %                                                                             %
 798 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 799 %
 800 %  IsPNG() returns MagickTrue if the image format type, identified by the
 801 %  magick string, is PNG.
 802 %
 803 %  The format of the IsPNG method is:
 804 %
 805 %      MagickBooleanType IsPNG(const unsigned char *magick,const size_t length)
 806 %
 807 %  A description of each parameter follows:
 808 %
 809 %    o magick: compare image format pattern against these bytes.
 810 %
 811 %    o length: Specifies the length of the magick string.
 812 %
 813 */
 814 static MagickBooleanType IsPNG(const unsigned char *magick,const size_t length)
 815 {
 816   if (length < 8)
 817     return(MagickFalse);
 818
 819   if (memcmp(magick,"\211PNG\r\n\032\n",8) == 0)
 820     return(MagickTrue);
 821
 822   return(MagickFalse);
 823 }
 824 \f
 825 #if defined(MAGICKCORE_PNG_DELEGATE)
 826 #if defined(__cplusplus) || defined(c_plusplus)
 827 extern "C" {
 828 #endif
 829
 830 #if (PNG_LIBPNG_VER > 10011)
 831 static size_t WriteBlobMSBULong(Image *image,const size_t value)
 832 {
 833   unsigned char
 834     buffer[4];
 835
 836   assert(image != (Image *) NULL);
 837   assert(image->signature == MagickSignature);
 838   buffer[0]=(unsigned char) (value >> 24);
 839   buffer[1]=(unsigned char) (value >> 16);
 840   buffer[2]=(unsigned char) (value >> 8);
 841   buffer[3]=(unsigned char) value;
 842   return((size_t) WriteBlob(image,4,buffer));
 843 }
 844
 845 static void PNGLong(png_bytep p,png_uint_32 value)
 846 {
 847   *p++=(png_byte) ((value >> 24) & 0xff);
 848   *p++=(png_byte) ((value >> 16) & 0xff);
 849   *p++=(png_byte) ((value >> 8) & 0xff);
 850   *p++=(png_byte) (value & 0xff);
 851 }
 852
 853 #if defined(JNG_SUPPORTED)
 854 static void PNGsLong(png_bytep p,png_int_32 value)
 855 {
 856   *p++=(png_byte) ((value >> 24) & 0xff);
 857   *p++=(png_byte) ((value >> 16) & 0xff);
 858   *p++=(png_byte) ((value >> 8) & 0xff);
 859   *p++=(png_byte) (value & 0xff);
 860 }
 861 #endif
 862
 863 static void PNGShort(png_bytep p,png_uint_16 value)
 864 {
 865   *p++=(png_byte) ((value >> 8) & 0xff);
 866   *p++=(png_byte) (value & 0xff);
 867 }
 868
 869 static void PNGType(png_bytep p,png_bytep type)
 870 {
 871   (void) CopyMagickMemory(p,type,4*sizeof(png_byte));
 872 }
 873
 874 static void LogPNGChunk(MagickBooleanType logging, png_bytep type,
 875    size_t length)
 876 {
 877   if (logging != MagickFalse)
 878     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
 879       "  Writing %c%c%c%c chunk, length: %.20g",
 880       type[0],type[1],type[2],type[3],(double) length);
 881 }
 882 #endif /* PNG_LIBPNG_VER > 10011 */
 883
 884 #if defined(__cplusplus) || defined(c_plusplus)
 885 }
 886 #endif
 887
 888 #if PNG_LIBPNG_VER > 10011
 889 /*
 890 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 891 %                                                                             %
 892 %                                                                             %
 893 %                                                                             %
 894 %   R e a d P N G I m a g e                                                   %
 895 %                                                                             %
 896 %                                                                             %
 897 %                                                                             %
 898 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 899 %
 900 %  ReadPNGImage() reads a Portable Network Graphics (PNG) or
 901 %  Multiple-image Network Graphics (MNG) image file and returns it.  It
 902 %  allocates the memory necessary for the new Image structure and returns a
 903 %  pointer to the new image or set of images.
 904 %
 905 %  MNG support written by Glenn Randers-Pehrson, glennrp@image...
 906 %
 907 %  The format of the ReadPNGImage method is:
 908 %
 909 %      Image *ReadPNGImage(const ImageInfo *image_info,ExceptionInfo *exception)
 910 %
 911 %  A description of each parameter follows:
 912 %
 913 %    o image_info: the image info.
 914 %
 915 %    o exception: return any errors or warnings in this structure.
 916 %
 917 %  To do, more or less in chronological order (as of version 5.5.2,
 918 %   November 26, 2002 -- glennrp -- see also "To do" under WriteMNGImage):
 919 %
 920 %    Get 16-bit cheap transparency working.
 921 %
 922 %    (At this point, PNG decoding is supposed to be in full MNG-LC compliance)
 923 %
 924 %    Preserve all unknown and not-yet-handled known chunks found in input
 925 %    PNG file and copy them into output PNG files according to the PNG
 926 %    copying rules.
 927 %
 928 %    (At this point, PNG encoding should be in full MNG compliance)
 929 %
 930 %    Provide options for choice of background to use when the MNG BACK
 931 %    chunk is not present or is not mandatory (i.e., leave transparent,
 932 %    user specified, MNG BACK, PNG bKGD)
 933 %
 934 %    Implement LOOP/ENDL [done, but could do discretionary loops more
 935 %    efficiently by linking in the duplicate frames.].
 936 %
 937 %    Decode and act on the MHDR simplicity profile (offer option to reject
 938 %    files or attempt to process them anyway when the profile isn't LC or VLC).
 939 %
 940 %    Upgrade to full MNG without Delta-PNG.
 941 %
 942 %        o  BACK [done a while ago except for background image ID]
 943 %        o  MOVE [done 15 May 1999]
 944 %        o  CLIP [done 15 May 1999]
 945 %        o  DISC [done 19 May 1999]
 946 %        o  SAVE [partially done 19 May 1999 (marks objects frozen)]
 947 %        o  SEEK [partially done 19 May 1999 (discard function only)]
 948 %        o  SHOW
 949 %        o  PAST
 950 %        o  BASI
 951 %        o  MNG-level tEXt/iTXt/zTXt
 952 %        o  pHYg
 953 %        o  pHYs
 954 %        o  sBIT
 955 %        o  bKGD
 956 %        o  iTXt (wait for libpng implementation).
 957 %
 958 %    Use the scene signature to discover when an identical scene is
 959 %    being reused, and just point to the original image->exception instead
 960 %    of storing another set of pixels.  This not specific to MNG
 961 %    but could be applied generally.
 962 %
 963 %    Upgrade to full MNG with Delta-PNG.
 964 %
 965 %    JNG tEXt/iTXt/zTXt
 966 %
 967 %    We will not attempt to read files containing the CgBI chunk.
 968 %    They are really Xcode files meant for display on the iPhone.
 969 %    These are not valid PNG files and it is impossible to recover
 970 %    the orginal PNG from files that have been converted to Xcode-PNG,
 971 %    since irretrievable loss of color data has occurred due to the
 972 %    use of premultiplied alpha.
 973 */
 974
 975 #if defined(__cplusplus) || defined(c_plusplus)
 976 extern "C" {
 977 #endif
 978
 979 /*
 980   This the function that does the actual reading of data.  It is
 981   the same as the one supplied in libpng, except that it receives the
 982   datastream from the ReadBlob() function instead of standard input.
 983 */
 984 static void png_get_data(png_structp png_ptr,png_bytep data,png_size_t length)
 985 {
 986   Image
 987     *image;
 988
 989   image=(Image *) png_get_io_ptr(png_ptr);
 990   if (length)
 991     {
 992       png_size_t
 993         check;
 994
 995       check=(png_size_t) ReadBlob(image,(size_t) length,data);
 996       if (check != length)
 997         {
 998           char
 999             msg[MaxTextExtent];
1000
1001           (void) FormatMagickString(msg,MaxTextExtent,
1002             "Expected %.20g bytes; found %.20g bytes",(double) length,
1003             (double) check);
1004           png_warning(png_ptr,msg);
1005           png_error(png_ptr,"Read Exception");
1006         }
1007     }
1008 }
1009
1010 #if !defined(PNG_READ_EMPTY_PLTE_SUPPORTED) && \
1011     !defined(PNG_MNG_FEATURES_SUPPORTED)
1012 /* We use mng_get_data() instead of png_get_data() if we have a libpng
1013  * older than libpng-1.0.3a, which was the first to allow the empty
1014  * PLTE, or a newer libpng in which PNG_MNG_FEATURES_SUPPORTED was
1015  * ifdef'ed out.  Earlier versions would crash if the bKGD chunk was
1016  * encountered after an empty PLTE, so we have to look ahead for bKGD
1017  * chunks and remove them from the datastream that is passed to libpng,
1018  * and store their contents for later use.
1019  */
1020 static void mng_get_data(png_structp png_ptr,png_bytep data,png_size_t length)
1021 {
1022   MngInfo
1023     *mng_info;
1024
1025   Image
1026     *image;
1027
1028   png_size_t
1029     check;
1030
1031   register ssize_t
1032     i;
1033
1034   i=0;
1035   mng_info=(MngInfo *) png_get_io_ptr(png_ptr);
1036   image=(Image *) mng_info->image;
1037   while (mng_info->bytes_in_read_buffer && length)
1038   {
1039     data[i]=mng_info->read_buffer[i];
1040     mng_info->bytes_in_read_buffer--;
1041     length--;
1042     i++;
1043   }
1044   if (length)
1045     {
1046       check=(png_size_t) ReadBlob(image,(size_t) length,(char *) data);
1047
1048       if (check != length)
1049         png_error(png_ptr,"Read Exception");
1050
1051       if (length == 4)
1052         {
1053           if ((data[0] == 0) && (data[1] == 0) && (data[2] == 0) &&
1054               (data[3] == 0))
1055             {
1056               check=(png_size_t) ReadBlob(image,(size_t) length,
1057                 (char *) mng_info->read_buffer);
1058               mng_info->read_buffer[4]=0;
1059               mng_info->bytes_in_read_buffer=4;
1060               if (memcmp(mng_info->read_buffer,mng_PLTE,4) == 0)
1061                 mng_info->found_empty_plte=MagickTrue;
1062               if (memcmp(mng_info->read_buffer,mng_IEND,4) == 0)
1063                 {
1064                   mng_info->found_empty_plte=MagickFalse;
1065                   mng_info->have_saved_bkgd_index=MagickFalse;
1066                 }
1067             }
1068
1069           if ((data[0] == 0) && (data[1] == 0) && (data[2] == 0) &&
1070               (data[3] == 1))
1071             {
1072               check=(png_size_t) ReadBlob(image,(size_t) length,
1073                 (char *) mng_info->read_buffer);
1074               mng_info->read_buffer[4]=0;
1075               mng_info->bytes_in_read_buffer=4;
1076               if (memcmp(mng_info->read_buffer,mng_bKGD,4) == 0)
1077                 if (mng_info->found_empty_plte)
1078                   {
1079                     /*
1080                       Skip the bKGD data byte and CRC.
1081                     */
1082                     check=(png_size_t)
1083                       ReadBlob(image,5,(char *) mng_info->read_buffer);
1084                     check=(png_size_t) ReadBlob(image,(size_t) length,
1085                       (char *) mng_info->read_buffer);
1086                     mng_info->saved_bkgd_index=mng_info->read_buffer[0];
1087                     mng_info->have_saved_bkgd_index=MagickTrue;
1088                     mng_info->bytes_in_read_buffer=0;
1089                   }
1090             }
1091         }
1092     }
1093 }
1094 #endif
1095
1096 static void png_put_data(png_structp png_ptr,png_bytep data,png_size_t length)
1097 {
1098   Image
1099     *image;
1100
1101   image=(Image *) png_get_io_ptr(png_ptr);
1102   if (length)
1103     {
1104       png_size_t
1105         check;
1106
1107       check=(png_size_t) WriteBlob(image,(size_t) length,data);
1108
1109       if (check != length)
1110         png_error(png_ptr,"WriteBlob Failed");
1111     }
1112 }
1113
1114 static void png_flush_data(png_structp png_ptr)
1115 {
1116   (void) png_ptr;
1117 }
1118
1119 #ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED
1120 static int PalettesAreEqual(Image *a,Image *b)
1121 {
1122   ssize_t
1123     i;
1124
1125   if ((a == (Image *) NULL) || (b == (Image *) NULL))
1126     return((int) MagickFalse);
1127
1128   if (a->storage_class != PseudoClass || b->storage_class != PseudoClass)
1129     return((int) MagickFalse);
1130
1131   if (a->colors != b->colors)
1132     return((int) MagickFalse);
1133
1134   for (i=0; i < (ssize_t) a->colors; i++)
1135   {
1136     if ((a->colormap[i].red != b->colormap[i].red) ||
1137         (a->colormap[i].green != b->colormap[i].green) ||
1138         (a->colormap[i].blue != b->colormap[i].blue))
1139       return((int) MagickFalse);
1140   }
1141
1142   return((int) MagickTrue);
1143 }
1144 #endif
1145
1146 static void MngInfoDiscardObject(MngInfo *mng_info,int i)
1147 {
1148   if (i && (i < MNG_MAX_OBJECTS) && (mng_info != (MngInfo *) NULL) &&
1149       mng_info->exists[i] && !mng_info->frozen[i])
1150     {
1151 #ifdef MNG_OBJECT_BUFFERS
1152       if (mng_info->ob[i] != (MngBuffer *) NULL)
1153         {
1154           if (mng_info->ob[i]->reference_count > 0)
1155             mng_info->ob[i]->reference_count--;
1156
1157           if (mng_info->ob[i]->reference_count == 0)
1158             {
1159               if (mng_info->ob[i]->image != (Image *) NULL)
1160                 mng_info->ob[i]->image=DestroyImage(mng_info->ob[i]->image);
1161
1162               mng_info->ob[i]=DestroyString(mng_info->ob[i]);
1163             }
1164         }
1165       mng_info->ob[i]=(MngBuffer *) NULL;
1166 #endif
1167       mng_info->exists[i]=MagickFalse;
1168       mng_info->invisible[i]=MagickFalse;
1169       mng_info->viewable[i]=MagickFalse;
1170       mng_info->frozen[i]=MagickFalse;
1171       mng_info->x_off[i]=0;
1172       mng_info->y_off[i]=0;
1173       mng_info->object_clip[i].left=0;
1174       mng_info->object_clip[i].right=(ssize_t) PNG_UINT_31_MAX;
1175       mng_info->object_clip[i].top=0;
1176       mng_info->object_clip[i].bottom=(ssize_t) PNG_UINT_31_MAX;
1177     }
1178 }
1179
1180 static void MngInfoFreeStruct(MngInfo *mng_info,
1181     MagickBooleanType *have_mng_structure)
1182 {
1183   if (*have_mng_structure != MagickFalse && (mng_info != (MngInfo *) NULL))
1184     {
1185       register ssize_t
1186         i;
1187
1188       for (i=1; i < MNG_MAX_OBJECTS; i++)
1189         MngInfoDiscardObject(mng_info,i);
1190
1191       if (mng_info->global_plte != (png_colorp) NULL)
1192         mng_info->global_plte=(png_colorp)
1193           RelinquishMagickMemory(mng_info->global_plte);
1194
1195       mng_info=(MngInfo *) RelinquishMagickMemory(mng_info);
1196       *have_mng_structure=MagickFalse;
1197     }
1198 }
1199
1200 static MngBox mng_minimum_box(MngBox box1,MngBox box2)
1201 {
1202   MngBox
1203     box;
1204
1205   box=box1;
1206   if (box.left < box2.left)
1207     box.left=box2.left;
1208
1209   if (box.top < box2.top)
1210     box.top=box2.top;
1211
1212   if (box.right > box2.right)
1213     box.right=box2.right;
1214
1215   if (box.bottom > box2.bottom)
1216     box.bottom=box2.bottom;
1217
1218   return box;
1219 }
1220
1221 static MngBox mng_read_box(MngBox previous_box,char delta_type,unsigned char *p)
1222 {
1223    MngBox
1224       box;
1225
1226   /*
1227     Read clipping boundaries from DEFI, CLIP, FRAM, or PAST chunk.
1228   */
1229   box.left=(ssize_t) ((p[0]  << 24) | (p[1]  << 16) | (p[2]  << 8) | p[3]);
1230   box.right=(ssize_t) ((p[4]  << 24) | (p[5]  << 16) | (p[6]  << 8) | p[7]);
1231   box.top=(ssize_t) ((p[8]  << 24) | (p[9]  << 16) | (p[10] << 8) | p[11]);
1232   box.bottom=(ssize_t) ((p[12] << 24) | (p[13] << 16) | (p[14] << 8) | p[15]);
1233   if (delta_type != 0)
1234     {
1235       box.left+=previous_box.left;
1236       box.right+=previous_box.right;
1237       box.top+=previous_box.top;
1238       box.bottom+=previous_box.bottom;
1239     }
1240
1241   return(box);
1242 }
1243
1244 static MngPair mng_read_pair(MngPair previous_pair,int delta_type,
1245   unsigned char *p)
1246 {
1247   MngPair
1248     pair;
1249   /*
1250     Read two ssize_ts from CLON, MOVE or PAST chunk
1251   */
1252   pair.a=(long) ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
1253   pair.b=(long) ((p[4] << 24) | (p[5] << 16) | (p[6] << 8) | p[7]);
1254
1255   if (delta_type != 0)
1256     {
1257       pair.a+=previous_pair.a;
1258       pair.b+=previous_pair.b;
1259     }
1260
1261   return(pair);
1262 }
1263
1264 static long mng_get_long(unsigned char *p)
1265 {
1266   return((long) ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]));
1267 }
1268
1269 static void MagickPNGErrorHandler(png_struct *ping,png_const_charp message)
1270 {
1271   Image
1272     *image;
1273
1274   image=(Image *) png_get_error_ptr(ping);
1275
1276   if (image->debug != MagickFalse)
1277     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1278       "  libpng-%s error: %s", PNG_LIBPNG_VER_STRING,message);
1279
1280   (void) ThrowMagickException(&image->exception,GetMagickModule(),CoderError,
1281     message,"`%s'",image->filename);
1282
1283 #if (PNG_LIBPNG_VER < 10500)
1284   /* A warning about deprecated use of jmpbuf here is unavoidable if you
1285    * are building with libpng-1.4.x and can be ignored.
1286    */
1287   longjmp(ping->jmpbuf,1);
1288 #else
1289   png_longjmp(ping,1);
1290 #endif
1291 }
1292
1293 static void MagickPNGWarningHandler(png_struct *ping,png_const_charp message)
1294 {
1295   Image
1296     *image;
1297
1298   if (LocaleCompare(message, "Missing PLTE before tRNS") == 0)
1299     png_error(ping, message);
1300
1301   image=(Image *) png_get_error_ptr(ping);
1302   if (image->debug != MagickFalse)
1303     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1304       "  libpng-%s warning: %s", PNG_LIBPNG_VER_STRING,message);
1305
1306   (void) ThrowMagickException(&image->exception,GetMagickModule(),CoderWarning,
1307     message,"`%s'",image->filename);
1308 }
1309
1310 #ifdef PNG_USER_MEM_SUPPORTED
1311 static png_voidp Magick_png_malloc(png_structp png_ptr,png_uint_32 size)
1312 {
1313 #if (PNG_LIBPNG_VER < 10011)
1314   png_voidp
1315     ret;
1316
1317   png_ptr=png_ptr;
1318   ret=((png_voidp) AcquireMagickMemory((size_t) size));
1319
1320   if (ret == NULL)
1321     png_error("Insufficient memory.");
1322
1323   return(ret);
1324 #else
1325   png_ptr=png_ptr;
1326   return((png_voidp) AcquireMagickMemory((size_t) size));
1327 #endif
1328 }
1329
1330 /*
1331   Free a pointer.  It is removed from the list at the same time.
1332 */
1333 static png_free_ptr Magick_png_free(png_structp png_ptr,png_voidp ptr)
1334 {
1335   png_ptr=png_ptr;
1336   ptr=RelinquishMagickMemory(ptr);
1337   return((png_free_ptr) NULL);
1338 }
1339 #endif
1340
1341 #if defined(__cplusplus) || defined(c_plusplus)
1342 }
1343 #endif
1344
1345 static int
1346 Magick_png_read_raw_profile(Image *image, const ImageInfo *image_info,
1347    png_textp text,int ii)
1348 {
1349   register ssize_t
1350     i;
1351
1352   register unsigned char
1353     *dp;
1354
1355   register png_charp
1356     sp;
1357
1358   png_uint_32
1359     length,
1360     nibbles;
1361
1362   StringInfo
1363     *profile;
1364
1365   const unsigned char
1366     unhex[103]={0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,
1367                  0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,
1368                  0,0,0,0,0,0,0,0,0,1, 2,3,4,5,6,7,8,9,0,0,
1369                  0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,
1370                  0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,10,11,12,
1371                  13,14,15};
1372
1373   sp=text[ii].text+1;
1374   /* look for newline */
1375   while (*sp != '\n')
1376      sp++;
1377
1378   /* look for length */
1379   while (*sp == '\0' || *sp == ' ' || *sp == '\n')
1380      sp++;
1381
1382   length=(png_uint_32) StringToLong(sp);
1383
1384   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1385        "      length: %lu",(unsigned long) length);
1386
1387   while (*sp != ' ' && *sp != '\n')
1388      sp++;
1389
1390   /* allocate space */
1391   if (length == 0)
1392   {
1393     (void) ThrowMagickException(&image->exception,GetMagickModule(),
1394       CoderWarning,"UnableToCopyProfile","`%s'","invalid profile length");
1395     return(MagickFalse);
1396   }
1397
1398   profile=AcquireStringInfo(length);
1399
1400   if (profile == (StringInfo *) NULL)
1401   {
1402     (void) ThrowMagickException(&image->exception,GetMagickModule(),
1403       ResourceLimitError,"MemoryAllocationFailed","`%s'",
1404       "unable to copy profile");
1405     return(MagickFalse);
1406   }
1407
1408   /* copy profile, skipping white space and column 1 "=" signs */
1409   dp=GetStringInfoDatum(profile);
1410   nibbles=length*2;
1411
1412   for (i=0; i < (ssize_t) nibbles; i++)
1413   {
1414     while (*sp < '0' || (*sp > '9' && *sp < 'a') || *sp > 'f')
1415     {
1416       if (*sp == '\0')
1417         {
1418           (void) ThrowMagickException(&image->exception,GetMagickModule(),
1419             CoderWarning,"UnableToCopyProfile","`%s'","ran out of data");
1420           profile=DestroyStringInfo(profile);
1421           return(MagickFalse);
1422         }
1423       sp++;
1424     }
1425
1426     if (i%2 == 0)
1427       *dp=(unsigned char) (16*unhex[(int) *sp++]);
1428
1429     else
1430       (*dp++)+=unhex[(int) *sp++];
1431   }
1432   /*
1433     We have already read "Raw profile type.
1434   */
1435   (void) SetImageProfile(image,&text[ii].key[17],profile);
1436   profile=DestroyStringInfo(profile);
1437
1438   if (image_info->verbose)
1439     (void) printf(" Found a generic profile, type %s\n",&text[ii].key[17]);
1440
1441   return MagickTrue;
1442 }
1443
1444 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1445 static int read_vpag_chunk_callback(png_struct *ping, png_unknown_chunkp chunk)
1446 {
1447   Image
1448     *image;
1449
1450
1451   /* The unknown chunk structure contains the chunk data:
1452      png_byte name[5];
1453      png_byte *data;
1454      png_size_t size;
1455
1456      Note that libpng has already taken care of the CRC handling.
1457   */
1458
1459
1460   if (chunk->name[0] != 118 || chunk->name[1] != 112 ||
1461       chunk->name[2] != 65 ||chunk-> name[3] != 103)
1462     return(0); /* Did not recognize */
1463
1464   /* recognized vpAg */
1465
1466   if (chunk->size != 9)
1467     return(-1); /* Error return */
1468
1469   if (chunk->data[8] != 0)
1470     return(0);  /* ImageMagick requires pixel units */
1471
1472   image=(Image *) png_get_user_chunk_ptr(ping);
1473
1474   image->page.width=(size_t) ((chunk->data[0] << 24) |
1475      (chunk->data[1] << 16) | (chunk->data[2] << 8) | chunk->data[3]);
1476
1477   image->page.height=(size_t) ((chunk->data[4] << 24) |
1478      (chunk->data[5] << 16) | (chunk->data[6] << 8) | chunk->data[7]);
1479
1480   /* Return one of the following: */
1481      /* return(-n);  chunk had an error */
1482      /* return(0);  did not recognize */
1483      /* return(n);  success */
1484
1485   return(1);
1486
1487 }
1488 #endif
1489
1490 /*
1491 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1492 %                                                                             %
1493 %                                                                             %
1494 %                                                                             %
1495 %   R e a d O n e P N G I m a g e                                             %
1496 %                                                                             %
1497 %                                                                             %
1498 %                                                                             %
1499 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1500 %
1501 %  ReadOnePNGImage() reads a Portable Network Graphics (PNG) image file
1502 %  (minus the 8-byte signature)  and returns it.  It allocates the memory
1503 %  necessary for the new Image structure and returns a pointer to the new
1504 %  image.
1505 %
1506 %  The format of the ReadOnePNGImage method is:
1507 %
1508 %      Image *ReadOnePNGImage(MngInfo *mng_info, const ImageInfo *image_info,
1509 %         ExceptionInfo *exception)
1510 %
1511 %  A description of each parameter follows:
1512 %
1513 %    o mng_info: Specifies a pointer to a MngInfo structure.
1514 %
1515 %    o image_info: the image info.
1516 %
1517 %    o exception: return any errors or warnings in this structure.
1518 %
1519 */
1520 static Image *ReadOnePNGImage(MngInfo *mng_info,
1521     const ImageInfo *image_info, ExceptionInfo *exception)
1522 {
1523   /* Read one PNG image */
1524
1525   Image
1526     *image;
1527
1528   int
1529     num_text,
1530     num_passes,
1531     pass,
1532     ping_bit_depth,
1533     ping_color_type,
1534     ping_interlace_method,
1535     ping_compression_method,
1536     ping_filter_method,
1537     ping_num_trans;
1538
1539   LongPixelPacket
1540     transparent_color;
1541
1542   MagickBooleanType
1543     logging,
1544     status;
1545
1546   png_bytep
1547      ping_trans_alpha;
1548
1549   png_color_16p
1550      ping_background,
1551      ping_trans_color;
1552
1553   png_info
1554     *end_info,
1555     *ping_info;
1556
1557   png_struct
1558     *ping;
1559
1560   png_textp
1561     text;
1562
1563   png_uint_32
1564     ping_height,
1565     ping_width,
1566     ping_rowbytes;
1567
1568   QuantumInfo
1569     *quantum_info;
1570
1571   unsigned char
1572     *ping_pixels;
1573
1574   ssize_t
1575     y;
1576
1577   register unsigned char
1578     *p;
1579
1580   register IndexPacket
1581     *indexes;
1582
1583   register ssize_t
1584     i,
1585     x;
1586
1587   register PixelPacket
1588     *q;
1589
1590   size_t
1591     length,
1592     row_offset;
1593
1594 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1595   png_byte unused_chunks[]=
1596   {
1597     104,  73,  83,  84, (png_byte) '\0',   /* hIST */
1598     105,  84,  88, 116, (png_byte) '\0',   /* iTXt */
1599     112,  67,  65,  76, (png_byte) '\0',   /* pCAL */
1600     115,  67,  65,  76, (png_byte) '\0',   /* sCAL */
1601     115,  80,  76,  84, (png_byte) '\0',   /* sPLT */
1602     116,  73,  77,  69, (png_byte) '\0',   /* tIME */
1603   };
1604 #endif
1605
1606   logging=LogMagickEvent(CoderEvent,GetMagickModule(),
1607     "  enter ReadOnePNGImage()");
1608
1609 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
1610   LockSemaphoreInfo(ping_semaphore);
1611 #endif
1612
1613 #if (PNG_LIBPNG_VER < 10200)
1614   if (image_info->verbose)
1615     printf("Your PNG library (libpng-%s) is rather old.\n",
1616        PNG_LIBPNG_VER_STRING);
1617 #endif
1618
1619 #if (PNG_LIBPNG_VER >= 10400)
1620 #  ifndef  PNG_TRANSFORM_GRAY_TO_RGB    /* Added at libpng-1.4.0beta67 */
1621   if (image_info->verbose)
1622     {
1623       printf("Your PNG library (libpng-%s) is an old beta version.\n",
1624            PNG_LIBPNG_VER_STRING);
1625       printf("Please update it.\n");
1626     }
1627 #  endif
1628 #endif
1629
1630
1631   quantum_info = (QuantumInfo *) NULL;
1632   image=mng_info->image;
1633
1634   if (logging != MagickFalse)
1635     (void)LogMagickEvent(CoderEvent,GetMagickModule(),
1636       "  image->matte=%d",(int) image->matte);
1637
1638   /* Set to an out-of-range color unless tRNS chunk is present */
1639   transparent_color.red=65537;
1640   transparent_color.green=65537;
1641   transparent_color.blue=65537;
1642   transparent_color.opacity=65537;
1643
1644   /*
1645     Allocate the PNG structures
1646   */
1647 #ifdef PNG_USER_MEM_SUPPORTED
1648  ping=png_create_read_struct_2(PNG_LIBPNG_VER_STRING, image,
1649    MagickPNGErrorHandler,MagickPNGWarningHandler, NULL,
1650    (png_malloc_ptr) Magick_png_malloc,(png_free_ptr) Magick_png_free);
1651 #else
1652   ping=png_create_read_struct(PNG_LIBPNG_VER_STRING,image,
1653     MagickPNGErrorHandler,MagickPNGWarningHandler);
1654 #endif
1655   if (ping == (png_struct *) NULL)
1656     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
1657
1658   ping_info=png_create_info_struct(ping);
1659
1660   if (ping_info == (png_info *) NULL)
1661     {
1662       png_destroy_read_struct(&ping,(png_info **) NULL,(png_info **) NULL);
1663       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
1664     }
1665
1666   end_info=png_create_info_struct(ping);
1667
1668   if (end_info == (png_info *) NULL)
1669     {
1670       png_destroy_read_struct(&ping,&ping_info,(png_info **) NULL);
1671       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
1672     }
1673
1674   ping_pixels=(unsigned char *) NULL;
1675
1676   if (setjmp(png_jmpbuf(ping)))
1677     {
1678       /*
1679         PNG image is corrupt.
1680       */
1681       png_destroy_read_struct(&ping,&ping_info,&end_info);
1682 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
1683       UnlockSemaphoreInfo(ping_semaphore);
1684 #endif
1685       if (logging != MagickFalse)
1686         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1687           "  exit ReadOnePNGImage() with error.");
1688
1689       if (image != (Image *) NULL)
1690         {
1691           InheritException(exception,&image->exception);
1692           image->columns=0;
1693         }
1694
1695       return(GetFirstImageInList(image));
1696     }
1697   /*
1698     Prepare PNG for reading.
1699   */
1700
1701   mng_info->image_found++;
1702   png_set_sig_bytes(ping,8);
1703
1704   if (LocaleCompare(image_info->magick,"MNG") == 0)
1705     {
1706 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1707       (void) png_permit_mng_features(ping,PNG_ALL_MNG_FEATURES);
1708       png_set_read_fn(ping,image,png_get_data);
1709 #else
1710 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED)
1711       png_permit_empty_plte(ping,MagickTrue);
1712       png_set_read_fn(ping,image,png_get_data);
1713 #else
1714       mng_info->image=image;
1715       mng_info->bytes_in_read_buffer=0;
1716       mng_info->found_empty_plte=MagickFalse;
1717       mng_info->have_saved_bkgd_index=MagickFalse;
1718       png_set_read_fn(ping,mng_info,mng_get_data);
1719 #endif
1720 #endif
1721     }
1722
1723   else
1724     png_set_read_fn(ping,image,png_get_data);
1725
1726 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1727   /* Ignore unused chunks and all unknown chunks except for vpAg */
1728   png_set_keep_unknown_chunks(ping, 1, NULL, 0);
1729   png_set_keep_unknown_chunks(ping, 2, mng_vpAg, 1);
1730   png_set_keep_unknown_chunks(ping, 1, unused_chunks,
1731      (int)sizeof(unused_chunks)/5);
1732   /* Callback for other unknown chunks */
1733   png_set_read_user_chunk_fn(ping, image, read_vpag_chunk_callback);
1734 #endif
1735
1736 #if (PNG_LIBPNG_VER < 10400)
1737 #  if defined(PNG_USE_PNGGCCRD) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) && \
1738    (PNG_LIBPNG_VER >= 10200) && (PNG_LIBPNG_VER < 10220) && defined(__i386__)
1739   /* Disable thread-unsafe features of pnggccrd */
1740   if (png_access_version_number() >= 10200)
1741   {
1742     png_uint_32 mmx_disable_mask=0;
1743     png_uint_32 asm_flags;
1744
1745     mmx_disable_mask |= ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
1746                         | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
1747                         | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
1748                         | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH );
1749     asm_flags=png_get_asm_flags(ping);
1750     png_set_asm_flags(ping, asm_flags & ~mmx_disable_mask);
1751   }
1752 #  endif
1753 #endif
1754
1755   png_read_info(ping,ping_info);
1756
1757   png_get_IHDR(ping,ping_info,&ping_width,&ping_height,
1758                &ping_bit_depth,&ping_color_type,
1759                &ping_interlace_method,&ping_compression_method,
1760                &ping_filter_method);
1761
1762   (void) png_get_tRNS(ping, ping_info, &ping_trans_alpha, &ping_num_trans,
1763                       &ping_trans_color);
1764
1765   (void) png_get_bKGD(ping, ping_info, &ping_background);
1766
1767   if (ping_bit_depth < 8)
1768     {
1769       if (((int) ping_color_type == PNG_COLOR_TYPE_PALETTE))
1770         {
1771           png_set_packing(ping);
1772           ping_bit_depth = 8;
1773         }
1774     }
1775
1776   image->depth=ping_bit_depth;
1777   image->depth=GetImageQuantumDepth(image,MagickFalse);
1778   image->interlace=ping_interlace_method != 0 ? PNGInterlace : NoInterlace;
1779   if (logging != MagickFalse)
1780     {
1781       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1782         "    PNG width: %.20g, height: %.20g",
1783         (double) ping_width, (double) ping_height);
1784
1785       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1786         "    PNG color_type: %d, bit_depth: %d",
1787         ping_color_type, ping_bit_depth);
1788
1789       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1790         "    PNG compression_method: %d",
1791         ping_compression_method);
1792
1793       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1794         "    PNG interlace_method: %d, filter_method: %d",
1795         ping_interlace_method,ping_filter_method);
1796     }
1797
1798 #ifdef PNG_READ_iCCP_SUPPORTED
1799   if (png_get_valid(ping,ping_info,PNG_INFO_iCCP))
1800     {
1801       int
1802         compression;
1803
1804 #if (PNG_LIBPNG_VER < 10500)
1805       png_charp
1806         info;
1807 #else
1808       png_bytep
1809         info;
1810 #endif
1811
1812       png_charp
1813         name;
1814
1815       png_uint_32
1816         profile_length;
1817
1818       (void) png_get_iCCP(ping,ping_info,&name,(int *) &compression,&info,
1819         &profile_length);
1820
1821       if (profile_length != 0)
1822         {
1823           StringInfo
1824             *profile;
1825
1826           if (logging != MagickFalse)
1827             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1828               "    Reading PNG iCCP chunk.");
1829           profile=AcquireStringInfo(profile_length);
1830           SetStringInfoDatum(profile,(const unsigned char *) info);
1831           (void) SetImageProfile(image,"icc",profile);
1832           profile=DestroyStringInfo(profile);
1833       }
1834     }
1835 #endif
1836 #if defined(PNG_READ_sRGB_SUPPORTED)
1837   {
1838     int
1839       intent;
1840
1841     if (mng_info->have_global_srgb)
1842       image->rendering_intent=Magick_RenderingIntent_from_PNG_RenderingIntent
1843         (mng_info->global_srgb_intent);
1844
1845     if (png_get_sRGB(ping,ping_info,&intent))
1846       {
1847         image->rendering_intent=Magick_RenderingIntent_from_PNG_RenderingIntent
1848           (intent);
1849
1850         if (logging != MagickFalse)
1851           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1852             "    Reading PNG sRGB chunk: rendering_intent: %d",intent);
1853       }
1854   }
1855 #endif
1856   {
1857      double
1858         file_gamma;
1859
1860      if (!png_get_gAMA(ping,ping_info,&file_gamma))
1861        if (mng_info->have_global_gama)
1862          png_set_gAMA(ping,ping_info,mng_info->global_gamma);
1863
1864      if (png_get_gAMA(ping,ping_info,&file_gamma))
1865        {
1866          image->gamma=(float) file_gamma;
1867          if (logging != MagickFalse)
1868            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1869              "    Reading PNG gAMA chunk: gamma: %f",file_gamma);
1870        }
1871   }
1872   if (!png_get_valid(ping,ping_info,PNG_INFO_cHRM))
1873     {
1874       if (mng_info->have_global_chrm != MagickFalse)
1875         {
1876           (void) png_set_cHRM(ping,ping_info,
1877             mng_info->global_chrm.white_point.x,
1878             mng_info->global_chrm.white_point.y,
1879             mng_info->global_chrm.red_primary.x,
1880             mng_info->global_chrm.red_primary.y,
1881             mng_info->global_chrm.green_primary.x,
1882             mng_info->global_chrm.green_primary.y,
1883             mng_info->global_chrm.blue_primary.x,
1884             mng_info->global_chrm.blue_primary.y);
1885         }
1886     }
1887
1888   if (png_get_valid(ping,ping_info,PNG_INFO_cHRM))
1889     {
1890       (void) png_get_cHRM(ping,ping_info,
1891         &image->chromaticity.white_point.x,
1892         &image->chromaticity.white_point.y,
1893         &image->chromaticity.red_primary.x,
1894         &image->chromaticity.red_primary.y,
1895         &image->chromaticity.green_primary.x,
1896         &image->chromaticity.green_primary.y,
1897         &image->chromaticity.blue_primary.x,
1898         &image->chromaticity.blue_primary.y);
1899
1900       if (logging != MagickFalse)
1901         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1902           "    Reading PNG cHRM chunk.");
1903     }
1904
1905   if (image->rendering_intent != UndefinedIntent)
1906     {
1907       png_set_sRGB(ping,ping_info,
1908          Magick_RenderingIntent_to_PNG_RenderingIntent
1909          (image->rendering_intent));
1910       png_set_gAMA(ping,ping_info,0.45455f);
1911       png_set_cHRM(ping,ping_info,
1912                   0.6400f, 0.3300f, 0.3000f, 0.6000f,
1913                   0.1500f, 0.0600f, 0.3127f, 0.3290f);
1914     }
1915 #if defined(PNG_oFFs_SUPPORTED)
1916   if (png_get_valid(ping,ping_info,PNG_INFO_oFFs))
1917     {
1918       image->page.x=(ssize_t) png_get_x_offset_pixels(ping, ping_info);
1919       image->page.y=(ssize_t) png_get_y_offset_pixels(ping, ping_info);
1920
1921       if (logging != MagickFalse)
1922         if (image->page.x || image->page.y)
1923           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1924             "    Reading PNG oFFs chunk: x: %.20g, y: %.20g.",(double)
1925             image->page.x,(double) image->page.y);
1926     }
1927 #endif
1928 #if defined(PNG_pHYs_SUPPORTED)
1929   if (!png_get_valid(ping,ping_info,PNG_INFO_pHYs))
1930     {
1931       if (mng_info->have_global_phys)
1932         {
1933           png_set_pHYs(ping,ping_info,
1934                        mng_info->global_x_pixels_per_unit,
1935                        mng_info->global_y_pixels_per_unit,
1936                        mng_info->global_phys_unit_type);
1937         }
1938     }
1939
1940   if (png_get_valid(ping,ping_info,PNG_INFO_pHYs))
1941     {
1942       int
1943         unit_type;
1944
1945       png_uint_32
1946         x_resolution,
1947         y_resolution;
1948
1949       /*
1950         Set image resolution.
1951       */
1952       (void) png_get_pHYs(ping,ping_info,&x_resolution,&y_resolution,
1953         &unit_type);
1954       image->x_resolution=(double) x_resolution;
1955       image->y_resolution=(double) y_resolution;
1956
1957       if (unit_type == PNG_RESOLUTION_METER)
1958         {
1959           image->units=PixelsPerCentimeterResolution;
1960           image->x_resolution=(double) x_resolution/100.0;
1961           image->y_resolution=(double) y_resolution/100.0;
1962         }
1963
1964       if (logging != MagickFalse)
1965         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
1966           "    Reading PNG pHYs chunk: xres: %.20g, yres: %.20g, units: %d.",
1967           (double) x_resolution,(double) y_resolution,unit_type);
1968     }
1969 #endif
1970   if (png_get_valid(ping,ping_info,PNG_INFO_PLTE))
1971     {
1972       int
1973         number_colors;
1974
1975       png_colorp
1976         palette;
1977
1978       (void) png_get_PLTE(ping,ping_info,&palette,&number_colors);
1979
1980       if ((number_colors == 0) &&
1981           ((int) ping_color_type == PNG_COLOR_TYPE_PALETTE))
1982         {
1983           if (mng_info->global_plte_length)
1984             {
1985               png_set_PLTE(ping,ping_info,mng_info->global_plte,
1986                 (int) mng_info->global_plte_length);
1987
1988               if (!png_get_valid(ping,ping_info,PNG_INFO_tRNS))
1989                 if (mng_info->global_trns_length)
1990                   {
1991                     if (mng_info->global_trns_length >
1992                         mng_info->global_plte_length)
1993                       (void) ThrowMagickException(&image->exception,
1994                         GetMagickModule(),CoderError,
1995                         "global tRNS has more entries than global PLTE",
1996                         "`%s'",image_info->filename);
1997                     png_set_tRNS(ping,ping_info,mng_info->global_trns,
1998                       (int) mng_info->global_trns_length,NULL);
1999                   }
2000 #if defined(PNG_READ_bKGD_SUPPORTED)
2001               if (
2002 #ifndef PNG_READ_EMPTY_PLTE_SUPPORTED
2003                    mng_info->have_saved_bkgd_index ||
2004 #endif
2005                    png_get_valid(ping,ping_info,PNG_INFO_bKGD))
2006                     {
2007                       png_color_16
2008                          background;
2009
2010 #ifndef PNG_READ_EMPTY_PLTE_SUPPORTED
2011                       if (mng_info->have_saved_bkgd_index)
2012                         background.index=mng_info->saved_bkgd_index;
2013 #endif
2014                       if (png_get_valid(ping, ping_info, PNG_INFO_bKGD))
2015                         background.index=ping_background->index;
2016
2017                       background.red=(png_uint_16)
2018                         mng_info->global_plte[background.index].red;
2019
2020                       background.green=(png_uint_16)
2021                         mng_info->global_plte[background.index].green;
2022
2023                       background.blue=(png_uint_16)
2024                         mng_info->global_plte[background.index].blue;
2025
2026                       png_set_bKGD(ping,ping_info,&background);
2027                     }
2028 #endif
2029                 }
2030               else
2031                 (void) ThrowMagickException(&image->exception,GetMagickModule(),
2032                   CoderError,"No global PLTE in file","`%s'",
2033                   image_info->filename);
2034             }
2035         }
2036
2037 #if defined(PNG_READ_bKGD_SUPPORTED)
2038   if (mng_info->have_global_bkgd &&
2039           (!png_get_valid(ping,ping_info,PNG_INFO_bKGD)))
2040       image->background_color=mng_info->mng_global_bkgd;
2041
2042   if (png_get_valid(ping,ping_info,PNG_INFO_bKGD))
2043     {
2044       /*
2045         Set image background color.
2046       */
2047       if (logging != MagickFalse)
2048         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2049           "    Reading PNG bKGD chunk.");
2050
2051       if (ping_bit_depth == MAGICKCORE_QUANTUM_DEPTH)
2052         {
2053           image->background_color.red=ping_background->red;
2054           image->background_color.green=ping_background->green;
2055           image->background_color.blue=ping_background->blue;
2056         }
2057
2058       else /* Scale background components to 16-bit */
2059         {
2060           unsigned int
2061             bkgd_scale;
2062
2063           if (logging != MagickFalse)
2064             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2065               "    raw ping_background=(%d,%d,%d).",ping_background->red,
2066               ping_background->green,ping_background->blue);
2067
2068           bkgd_scale = 1;
2069
2070           if (ping_bit_depth == 1)
2071              bkgd_scale = 255;
2072
2073           else if (ping_bit_depth == 2)
2074              bkgd_scale = 85;
2075
2076           else if (ping_bit_depth == 4)
2077              bkgd_scale = 17;
2078
2079           if (ping_bit_depth <= 8)
2080              bkgd_scale *= 257;
2081
2082           ping_background->red *= bkgd_scale;
2083           ping_background->green *= bkgd_scale;
2084           ping_background->blue *= bkgd_scale;
2085
2086           if (logging != MagickFalse)
2087             {
2088             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2089               "    bkgd_scale=%d.",bkgd_scale);
2090
2091             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2092               "    ping_background=(%d,%d,%d).",ping_background->red,
2093               ping_background->green,ping_background->blue);
2094             }
2095
2096           image->background_color.red=
2097             ScaleShortToQuantum(ping_background->red);
2098
2099           image->background_color.green=
2100             ScaleShortToQuantum(ping_background->green);
2101
2102           image->background_color.blue=
2103             ScaleShortToQuantum(ping_background->blue);
2104
2105           image->background_color.opacity=OpaqueOpacity;
2106
2107           if (logging != MagickFalse)
2108             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2109               "    image->background_color=(%.20g,%.20g,%.20g).",
2110               (double) image->background_color.red,
2111               (double) image->background_color.green,
2112               (double) image->background_color.blue);
2113         }
2114     }
2115 #endif
2116
2117   if (png_get_valid(ping,ping_info,PNG_INFO_tRNS))
2118     {
2119       /*
2120         Image has a tRNS chunk.
2121       */
2122       int
2123         max_sample;
2124
2125       size_t
2126         one=1;
2127
2128       if (logging != MagickFalse)
2129         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2130           "    Reading PNG tRNS chunk.");
2131
2132       max_sample = (int) ((one << ping_bit_depth) - 1);
2133
2134       if ((ping_color_type == PNG_COLOR_TYPE_GRAY &&
2135           (int)ping_trans_color->gray > max_sample) ||
2136           (ping_color_type == PNG_COLOR_TYPE_RGB &&
2137           ((int)ping_trans_color->red > max_sample ||
2138           (int)ping_trans_color->green > max_sample ||
2139           (int)ping_trans_color->blue > max_sample)))
2140         {
2141           if (logging != MagickFalse)
2142             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2143               "    Ignoring PNG tRNS chunk with out-of-range sample.");
2144           png_free_data(ping, ping_info, PNG_FREE_TRNS, 0);
2145           png_set_invalid(ping,ping_info,PNG_INFO_tRNS);
2146           image->matte=MagickFalse;
2147         }
2148       else
2149         {
2150           int
2151              scale_to_short;
2152
2153           scale_to_short = 65535L/((1UL << ping_bit_depth)-1);
2154
2155           /* Scale transparent_color to short */
2156           transparent_color.red= scale_to_short*ping_trans_color->red;
2157           transparent_color.green= scale_to_short*ping_trans_color->green;
2158           transparent_color.blue= scale_to_short*ping_trans_color->blue;
2159           transparent_color.opacity= scale_to_short*ping_trans_color->gray;
2160
2161           if (ping_color_type == PNG_COLOR_TYPE_GRAY)
2162             {
2163               if (logging != MagickFalse)
2164               {
2165                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2166                   "    Raw tRNS graylevel is %d.",ping_trans_color->gray);
2167
2168                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2169                   "    scaled graylevel is %d.",transparent_color.opacity);
2170               }
2171               transparent_color.red=transparent_color.opacity;
2172               transparent_color.green=transparent_color.opacity;
2173               transparent_color.blue=transparent_color.opacity;
2174             }
2175         }
2176     }
2177 #if defined(PNG_READ_sBIT_SUPPORTED)
2178   if (mng_info->have_global_sbit)
2179     {
2180       if (!png_get_valid(ping,ping_info,PNG_INFO_sBIT))
2181         png_set_sBIT(ping,ping_info,&mng_info->global_sbit);
2182     }
2183 #endif
2184   num_passes=png_set_interlace_handling(ping);
2185
2186   png_read_update_info(ping,ping_info);
2187
2188   ping_rowbytes=png_get_rowbytes(ping,ping_info);
2189
2190   /*
2191     Initialize image structure.
2192   */
2193   mng_info->image_box.left=0;
2194   mng_info->image_box.right=(ssize_t) ping_width;
2195   mng_info->image_box.top=0;
2196   mng_info->image_box.bottom=(ssize_t) ping_height;
2197   if (mng_info->mng_type == 0)
2198     {
2199       mng_info->mng_width=ping_width;
2200       mng_info->mng_height=ping_height;
2201       mng_info->frame=mng_info->image_box;
2202       mng_info->clip=mng_info->image_box;
2203     }
2204
2205   else
2206     {
2207       image->page.y=mng_info->y_off[mng_info->object_id];
2208     }
2209
2210   image->compression=ZipCompression;
2211   image->columns=ping_width;
2212   image->rows=ping_height;
2213   if (((int) ping_color_type == PNG_COLOR_TYPE_PALETTE) ||
2214       ((int) ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA) ||
2215       ((int) ping_color_type == PNG_COLOR_TYPE_GRAY))
2216     {
2217       size_t
2218         one;
2219
2220       image->storage_class=PseudoClass;
2221       one=1;
2222       image->colors=one << ping_bit_depth;
2223 #if (MAGICKCORE_QUANTUM_DEPTH == 8)
2224       if (image->colors > 256)
2225         image->colors=256;
2226 #else
2227       if (image->colors > 65536L)
2228         image->colors=65536L;
2229 #endif
2230       if ((int) ping_color_type == PNG_COLOR_TYPE_PALETTE)
2231         {
2232           int
2233             number_colors;
2234
2235           png_colorp
2236             palette;
2237
2238           (void) png_get_PLTE(ping,ping_info,&palette,&number_colors);
2239           image->colors=(size_t) number_colors;
2240
2241           if (logging != MagickFalse)
2242             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2243               "    Reading PNG PLTE chunk: number_colors: %d.",number_colors);
2244         }
2245     }
2246
2247   if (image->storage_class == PseudoClass)
2248     {
2249       /*
2250         Initialize image colormap.
2251       */
2252       if (AcquireImageColormap(image,image->colors) == MagickFalse)
2253         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
2254
2255       if ((int) ping_color_type == PNG_COLOR_TYPE_PALETTE)
2256         {
2257           int
2258             number_colors;
2259
2260           png_colorp
2261             palette;
2262
2263           (void) png_get_PLTE(ping,ping_info,&palette,&number_colors);
2264
2265           for (i=0; i < (ssize_t) image->colors; i++)
2266           {
2267             image->colormap[i].red=ScaleCharToQuantum(palette[i].red);
2268             image->colormap[i].green=ScaleCharToQuantum(palette[i].green);
2269             image->colormap[i].blue=ScaleCharToQuantum(palette[i].blue);
2270           }
2271         }
2272
2273       else
2274         {
2275           size_t
2276             scale;
2277
2278           scale=(QuantumRange/((1UL << ping_bit_depth)-1));
2279
2280           if (scale < 1)
2281              scale=1;
2282
2283           for (i=0; i < (ssize_t) image->colors; i++)
2284           {
2285             image->colormap[i].red=(Quantum) (i*scale);
2286             image->colormap[i].green=(Quantum) (i*scale);
2287             image->colormap[i].blue=(Quantum) (i*scale);
2288           }
2289        }
2290     }
2291   /*
2292     Read image scanlines.
2293   */
2294   if (image->delay != 0)
2295     mng_info->scenes_found++;
2296
2297   if ((mng_info->mng_type == 0 && (image->ping != MagickFalse)) || (
2298       (image_info->number_scenes != 0) && (mng_info->scenes_found > (ssize_t)
2299       (image_info->first_scene+image_info->number_scenes))))
2300     {
2301       if (logging != MagickFalse)
2302         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2303           "    Skipping PNG image data for scene %.20g",(double)
2304           mng_info->scenes_found-1);
2305       png_destroy_read_struct(&ping,&ping_info,&end_info);
2306 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
2307       UnlockSemaphoreInfo(ping_semaphore);
2308 #endif
2309       if (logging != MagickFalse)
2310         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2311           "  exit ReadOnePNGImage().");
2312
2313       return(image);
2314     }
2315
2316   if (logging != MagickFalse)
2317     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2318       "    Reading PNG IDAT chunk(s)");
2319
2320   if (num_passes > 1)
2321     ping_pixels=(unsigned char *) AcquireQuantumMemory(image->rows,
2322       ping_rowbytes*sizeof(*ping_pixels));
2323
2324   else
2325     ping_pixels=(unsigned char *) AcquireQuantumMemory(ping_rowbytes,
2326       sizeof(*ping_pixels));
2327
2328   if (ping_pixels == (unsigned char *) NULL)
2329     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
2330
2331   if (logging != MagickFalse)
2332     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2333       "    Converting PNG pixels to pixel packets");
2334   /*
2335     Convert PNG pixels to pixel packets.
2336   */
2337   if (setjmp(png_jmpbuf(ping)))
2338     {
2339       /*
2340         PNG image is corrupt.
2341       */
2342       png_destroy_read_struct(&ping,&ping_info,&end_info);
2343 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
2344       UnlockSemaphoreInfo(ping_semaphore);
2345 #endif
2346       if (quantum_info != (QuantumInfo *) NULL)
2347         quantum_info = DestroyQuantumInfo(quantum_info);
2348
2349       if (ping_pixels != (unsigned char *) NULL)
2350         ping_pixels=(unsigned char *) RelinquishMagickMemory(ping_pixels);
2351
2352       if (logging != MagickFalse)
2353         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2354           "  exit ReadOnePNGImage() with error.");
2355
2356       if (image != (Image *) NULL)
2357         {
2358           InheritException(exception,&image->exception);
2359           image->columns=0;
2360         }
2361
2362       return(GetFirstImageInList(image));
2363     }
2364
2365   quantum_info=AcquireQuantumInfo(image_info,image);
2366
2367   if (quantum_info == (QuantumInfo *) NULL)
2368     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
2369
2370   {
2371
2372    MagickBooleanType
2373      found_transparent_pixel;
2374
2375   found_transparent_pixel=MagickFalse;
2376
2377   if (image->storage_class == DirectClass)
2378     {
2379       for (pass=0; pass < num_passes; pass++)
2380       {
2381         /*
2382           Convert image to DirectClass pixel packets.
2383         */
2384 #if  (MAGICKCORE_QUANTUM_DEPTH == 8)
2385         int
2386           depth;
2387
2388         depth=(ssize_t) ping_bit_depth;
2389 #endif
2390         image->matte=(((int) ping_color_type == PNG_COLOR_TYPE_RGB_ALPHA) ||
2391             ((int) ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA) ||
2392             (png_get_valid(ping,ping_info,PNG_INFO_tRNS))) ?
2393             MagickTrue : MagickFalse;
2394
2395         for (y=0; y < (ssize_t) image->rows; y++)
2396         {
2397           if (num_passes > 1)
2398             row_offset=ping_rowbytes*y;
2399
2400           else
2401             row_offset=0;
2402
2403           png_read_row(ping,ping_pixels+row_offset,NULL);
2404           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
2405
2406           if (q == (PixelPacket *) NULL)
2407             break;
2408
2409 #if  (0 && (MAGICKCORE_QUANTUM_DEPTH == 8) && !defined(MAGICKCORE_HDRI_SUPPORT))
2410 /* code deleted from version 6.6.6-8 */
2411 #else  /* (MAGICKCORE_QUANTUM_DEPTH != 8) */
2412
2413           if ((int) ping_color_type == PNG_COLOR_TYPE_GRAY)
2414             (void) ImportQuantumPixels(image,(CacheView *) NULL,quantum_info,
2415               GrayQuantum,ping_pixels+row_offset,exception);
2416
2417           else if ((int) ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
2418             (void) ImportQuantumPixels(image,(CacheView *) NULL,quantum_info,
2419               GrayAlphaQuantum,ping_pixels+row_offset,exception);
2420
2421           else if ((int) ping_color_type == PNG_COLOR_TYPE_RGB_ALPHA)
2422             (void) ImportQuantumPixels(image,(CacheView *) NULL,quantum_info,
2423               RGBAQuantum,ping_pixels+row_offset,exception);
2424
2425           else if ((int) ping_color_type == PNG_COLOR_TYPE_PALETTE)
2426             (void) ImportQuantumPixels(image,(CacheView *) NULL,quantum_info,
2427               IndexQuantum,ping_pixels+row_offset,exception);
2428
2429           else /* ping_color_type == PNG_COLOR_TYPE_RGB */
2430             (void) ImportQuantumPixels(image,(CacheView *) NULL,quantum_info,
2431               RGBQuantum,ping_pixels+row_offset,exception);
2432 #endif
2433           if (found_transparent_pixel == MagickFalse)
2434             {
2435               /* Is there a transparent pixel in the row? */
2436               if (y== 0 && logging != MagickFalse)
2437                  (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2438                    "    Looking for cheap transparent pixel");
2439
2440               for (x=(ssize_t) image->columns-1; x >= 0; x--)
2441               {
2442                 if ((ping_color_type == PNG_COLOR_TYPE_RGBA ||
2443                     ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA) &&
2444                    (q->opacity != OpaqueOpacity))
2445                   {
2446                     if (logging != MagickFalse)
2447                       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2448                         "    ...got one.");
2449
2450                     found_transparent_pixel = MagickTrue;
2451                     break;
2452                   }
2453                 if ((ping_color_type == PNG_COLOR_TYPE_RGB ||
2454                     ping_color_type == PNG_COLOR_TYPE_GRAY) &&
2455                     (ScaleQuantumToShort(q->red) == transparent_color.red &&
2456                     ScaleQuantumToShort(q->green) == transparent_color.green &&
2457                     ScaleQuantumToShort(q->blue) == transparent_color.blue))
2458                   {
2459                     if (logging != MagickFalse)
2460                       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2461                         "    ...got one.");
2462                     found_transparent_pixel = MagickTrue;
2463                     break;
2464                   }
2465                 q++;
2466               }
2467             }
2468
2469           if ((image->previous == (Image *) NULL) && (num_passes == 1))
2470             {
2471               status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
2472                   image->rows);
2473
2474               if (status == MagickFalse)
2475                 break;
2476             }
2477           if (SyncAuthenticPixels(image,exception) == MagickFalse)
2478             break;
2479         }
2480
2481         if ((image->previous == (Image *) NULL) && (num_passes != 1))
2482           {
2483             status=SetImageProgress(image,LoadImageTag,pass,num_passes);
2484             if (status == MagickFalse)
2485               break;
2486           }
2487       }
2488     }
2489
2490   else /* image->storage_class != DirectClass */
2491
2492     for (pass=0; pass < num_passes; pass++)
2493     {
2494       Quantum
2495         *quantum_scanline;
2496
2497       register Quantum
2498         *r;
2499
2500       /*
2501         Convert grayscale image to PseudoClass pixel packets.
2502       */
2503       image->matte=ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA ?
2504         MagickTrue : MagickFalse;
2505
2506       quantum_scanline=(Quantum *) AcquireQuantumMemory(image->columns,
2507         (image->matte ?  2 : 1)*sizeof(*quantum_scanline));
2508
2509       if (quantum_scanline == (Quantum *) NULL)
2510         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
2511
2512       for (y=0; y < (ssize_t) image->rows; y++)
2513       {
2514         if (num_passes > 1)
2515           row_offset=ping_rowbytes*y;
2516
2517         else
2518           row_offset=0;
2519
2520         png_read_row(ping,ping_pixels+row_offset,NULL);
2521         q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
2522
2523         if (q == (PixelPacket *) NULL)
2524           break;
2525
2526         indexes=GetAuthenticIndexQueue(image);
2527         p=ping_pixels+row_offset;
2528         r=quantum_scanline;
2529
2530         switch (ping_bit_depth)
2531         {
2532           case 1:
2533           {
2534             register ssize_t
2535               bit;
2536
2537             for (x=(ssize_t) image->columns-7; x > 0; x-=8)
2538             {
2539               for (bit=7; bit >= 0; bit--)
2540                 *r++=(Quantum) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
2541               p++;
2542             }
2543
2544             if ((image->columns % 8) != 0)
2545               {
2546                 for (bit=7; bit >= (ssize_t) (8-(image->columns % 8)); bit--)
2547                   *r++=(Quantum) ((*p) & (0x01 << bit) ? 0x01 : 0x00);
2548               }
2549
2550             break;
2551           }
2552
2553           case 2:
2554           {
2555             for (x=(ssize_t) image->columns-3; x > 0; x-=4)
2556             {
2557               *r++=(*p >> 6) & 0x03;
2558               *r++=(*p >> 4) & 0x03;
2559               *r++=(*p >> 2) & 0x03;
2560               *r++=(*p++) & 0x03;
2561             }
2562
2563             if ((image->columns % 4) != 0)
2564               {
2565                 for (i=3; i >= (ssize_t) (4-(image->columns % 4)); i--)
2566                   *r++=(Quantum) ((*p >> (i*2)) & 0x03);
2567               }
2568
2569             break;
2570           }
2571
2572           case 4:
2573           {
2574             for (x=(ssize_t) image->columns-1; x > 0; x-=2)
2575             {
2576               *r++=(*p >> 4) & 0x0f;
2577               *r++=(*p++) & 0x0f;
2578             }
2579
2580             if ((image->columns % 2) != 0)
2581               *r++=(*p++ >> 4) & 0x0f;
2582
2583             break;
2584           }
2585
2586           case 8:
2587           {
2588             if (ping_color_type == 4)
2589               for (x=(ssize_t) image->columns-1; x >= 0; x--)
2590               {
2591                 *r++=*p++;
2592                 /* In image.h, OpaqueOpacity is 0
2593                  * TransparentOpacity is QuantumRange
2594                  * In a PNG datastream, Opaque is QuantumRange
2595                  * and Transparent is 0.
2596                  */
2597                 q->opacity=ScaleCharToQuantum((unsigned char) (255-(*p++)));
2598                 if (q->opacity != OpaqueOpacity)
2599                   found_transparent_pixel = MagickTrue;
2600                 q++;
2601               }
2602
2603             else
2604               for (x=(ssize_t) image->columns-1; x >= 0; x--)
2605                 *r++=*p++;
2606
2607             break;
2608           }
2609
2610           case 16:
2611           {
2612             for (x=(ssize_t) image->columns-1; x >= 0; x--)
2613             {
2614 #if (MAGICKCORE_QUANTUM_DEPTH == 16)
2615               size_t
2616                 quantum;
2617
2618               if (image->colors > 256)
2619                 *r=((*p++) << 8);
2620
2621               else
2622                 *r=0;
2623
2624               quantum=(*r);
2625               quantum|=(*p++);
2626               *r=(Quantum) quantum;
2627               r++;
2628
2629               if (ping_color_type == 4)
2630                 {
2631                   quantum=((*p++) << 8);
2632                   quantum|=(*p++);
2633                   q->opacity=(Quantum) (QuantumRange-quantum);
2634                   if (q->opacity != OpaqueOpacity)
2635                     found_transparent_pixel = MagickTrue;
2636                   q++;
2637                 }
2638 #else
2639 #if (MAGICKCORE_QUANTUM_DEPTH == 32)
2640               size_t
2641                 quantum;
2642
2643               if (image->colors > 256)
2644                 *r=((*p++) << 8);
2645
2646               else
2647                 *r=0;
2648
2649               quantum=(*r);
2650               quantum|=(*p++);
2651               *r=quantum;
2652               r++;
2653
2654               if (ping_color_type == 4)
2655                 {
2656                   q->opacity=(*p << 8) | *(p+1);
2657                   q->opacity*=65537L;
2658                   q->opacity=(Quantum) GetAlphaPixelComponent(q);
2659                   if (q->opacity != OpaqueOpacity)
2660                     found_transparent_pixel = MagickTrue;
2661                   p+=2;
2662                   q++;
2663                 }
2664
2665 #else /* MAGICKCORE_QUANTUM_DEPTH == 8 */
2666               *r++=(*p++);
2667               p++; /* strip low byte */
2668
2669               if (ping_color_type == 4)
2670                 {
2671                   q->opacity=(Quantum) (QuantumRange-(*p++));
2672                   if (q->opacity != OpaqueOpacity)
2673                     found_transparent_pixel = MagickTrue;
2674                   p++;
2675                   q++;
2676                 }
2677 #endif
2678 #endif
2679             }
2680
2681             break;
2682           }
2683
2684           default:
2685             break;
2686         }
2687         /*
2688           Transfer image scanline.
2689         */
2690         r=quantum_scanline;
2691
2692         for (x=0; x < (ssize_t) image->columns; x++)
2693           indexes[x]=(IndexPacket) (*r++);
2694
2695         if (SyncAuthenticPixels(image,exception) == MagickFalse)
2696           break;
2697
2698         if ((image->previous == (Image *) NULL) && (num_passes == 1))
2699           {
2700             status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
2701                 image->rows);
2702
2703             if (status == MagickFalse)
2704               break;
2705           }
2706       }
2707
2708       if ((image->previous == (Image *) NULL) && (num_passes != 1))
2709         {
2710           status=SetImageProgress(image,LoadImageTag,pass,num_passes);
2711
2712           if (status == MagickFalse)
2713             break;
2714         }
2715
2716       quantum_scanline=(Quantum *) RelinquishMagickMemory(quantum_scanline);
2717     }
2718
2719     image->matte=found_transparent_pixel;
2720
2721     if (logging != MagickFalse)
2722       {
2723         if (found_transparent_pixel != MagickFalse)
2724           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2725             "    Found transparent pixel");
2726         else
2727           {
2728             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2729               "    No transparent pixel was found");
2730
2731             ping_color_type&=0x03;
2732           }
2733       }
2734     }
2735
2736   if (quantum_info != (QuantumInfo *) NULL)
2737     quantum_info=DestroyQuantumInfo(quantum_info);
2738
2739   if (image->storage_class == PseudoClass)
2740     {
2741       MagickBooleanType
2742         matte;
2743
2744       matte=image->matte;
2745       image->matte=MagickFalse;
2746       (void) SyncImage(image);
2747       image->matte=matte;
2748     }
2749
2750   png_read_end(ping,ping_info);
2751
2752   if (image_info->number_scenes != 0 && mng_info->scenes_found-1 <
2753       (ssize_t) image_info->first_scene && image->delay != 0)
2754     {
2755       png_destroy_read_struct(&ping,&ping_info,&end_info);
2756       ping_pixels=(unsigned char *) RelinquishMagickMemory(ping_pixels);
2757       image->colors=2;
2758       (void) SetImageBackgroundColor(image);
2759 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
2760       UnlockSemaphoreInfo(ping_semaphore);
2761 #endif
2762       if (logging != MagickFalse)
2763         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2764           "  exit ReadOnePNGImage() early.");
2765       return(image);
2766     }
2767
2768   if (png_get_valid(ping,ping_info,PNG_INFO_tRNS))
2769     {
2770       ClassType
2771         storage_class;
2772
2773       /*
2774         Image has a transparent background.
2775       */
2776       storage_class=image->storage_class;
2777       image->matte=MagickTrue;
2778
2779 /* Balfour fix from imagemagick discourse server, 5 Feb 2010 */
2780
2781       if (storage_class == PseudoClass)
2782         {
2783           if ((int) ping_color_type == PNG_COLOR_TYPE_PALETTE)
2784             {
2785               for (x=0; x < ping_num_trans; x++)
2786               {
2787                  image->colormap[x].opacity =
2788                    ScaleCharToQuantum((unsigned char)(255-ping_trans_alpha[x]));
2789               }
2790             }
2791
2792           else if (ping_color_type == PNG_COLOR_TYPE_GRAY)
2793             {
2794               for (x=0; x < (int) image->colors; x++)
2795               {
2796                  if (ScaleQuantumToShort(image->colormap[x].red) ==
2797                      transparent_color.opacity)
2798                  {
2799                     image->colormap[x].opacity = (Quantum) TransparentOpacity;
2800                  }
2801               }
2802             }
2803           (void) SyncImage(image);
2804         }
2805
2806 #if 1 /* Should have already been done above, but glennrp problem P10
2807        * needs this.
2808        */
2809       else
2810         {
2811           for (y=0; y < (ssize_t) image->rows; y++)
2812           {
2813             image->storage_class=storage_class;
2814             q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
2815
2816             if (q == (PixelPacket *) NULL)
2817               break;
2818
2819             indexes=GetAuthenticIndexQueue(image);
2820
2821             /* Caution: on a Q8 build, this does not distinguish between
2822              * 16-bit colors that differ only in the low byte
2823              */
2824             for (x=(ssize_t) image->columns-1; x >= 0; x--)
2825             {
2826               if (ScaleQuantumToShort(q->red) == transparent_color.red &&
2827                   ScaleQuantumToShort(q->green) == transparent_color.green &&
2828                   ScaleQuantumToShort(q->blue) == transparent_color.blue)
2829                 {
2830                   q->opacity=(Quantum) TransparentOpacity;
2831                 }
2832
2833 #if 0 /* I have not found a case where this is needed. */
2834               else
2835                 {
2836                   q->opacity=(Quantum) OpaqueOpacity;
2837                 }
2838 #endif
2839
2840               q++;
2841             }
2842
2843             if (SyncAuthenticPixels(image,exception) == MagickFalse)
2844                break;
2845           }
2846         }
2847 #endif
2848
2849       image->storage_class=DirectClass;
2850     }
2851
2852   if ((ping_color_type == PNG_COLOR_TYPE_GRAY) ||
2853       (ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA))
2854     image->colorspace=GRAYColorspace;
2855
2856   if (png_get_text(ping,ping_info,&text,&num_text) != 0)
2857     for (i=0; i < (ssize_t) num_text; i++)
2858     {
2859       /* Check for a profile */
2860
2861       if (logging != MagickFalse)
2862         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2863           "    Reading PNG text chunk");
2864
2865       if (memcmp(text[i].key, "Raw profile type ",17) == 0)
2866           (void) Magick_png_read_raw_profile(image,image_info,text,(int) i);
2867
2868       else
2869         {
2870           char
2871             *value;
2872
2873           length=text[i].text_length;
2874           value=(char *) AcquireQuantumMemory(length+MaxTextExtent,
2875             sizeof(*value));
2876           if (value == (char *) NULL)
2877             {
2878               (void) ThrowMagickException(&image->exception,GetMagickModule(),
2879                 ResourceLimitError,"MemoryAllocationFailed","`%s'",
2880                 image->filename);
2881               break;
2882             }
2883           *value='\0';
2884           (void) ConcatenateMagickString(value,text[i].text,length+2);
2885           (void) SetImageProperty(image,text[i].key,value);
2886
2887           if (logging != MagickFalse)
2888           {
2889             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2890               "      length: %lu",(unsigned long) length);
2891             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
2892               "      Keyword: %s",text[i].key);
2893           }
2894
2895           value=DestroyString(value);
2896         }
2897     }
2898
2899 #ifdef MNG_OBJECT_BUFFERS
2900   /*
2901     Store the object if necessary.
2902   */
2903   if (object_id && !mng_info->frozen[object_id])
2904     {
2905       if (mng_info->ob[object_id] == (MngBuffer *) NULL)
2906         {
2907           /*
2908             create a new object buffer.
2909           */
2910           mng_info->ob[object_id]=(MngBuffer *)
2911             AcquireMagickMemory(sizeof(MngBuffer));
2912
2913           if (mng_info->ob[object_id] != (MngBuffer *) NULL)
2914             {
2915               mng_info->ob[object_id]->image=(Image *) NULL;
2916               mng_info->ob[object_id]->reference_count=1;
2917             }
2918         }
2919
2920       if ((mng_info->ob[object_id] == (MngBuffer *) NULL) ||
2921           mng_info->ob[object_id]->frozen)
2922         {
2923           if (mng_info->ob[object_id] == (MngBuffer *) NULL)
2924             (void) ThrowMagickException(&image->exception,GetMagickModule(),
2925               ResourceLimitError,"MemoryAllocationFailed","`%s'",
2926               image->filename);
2927
2928           if (mng_info->ob[object_id]->frozen)
2929             (void) ThrowMagickException(&image->exception,GetMagickModule(),
2930               ResourceLimitError,"Cannot overwrite frozen MNG object buffer",
2931               "`%s'",image->filename);
2932         }
2933
2934       else
2935         {
2936
2937           if (mng_info->ob[object_id]->image != (Image *) NULL)
2938             mng_info->ob[object_id]->image=DestroyImage
2939                 (mng_info->ob[object_id]->image);
2940
2941           mng_info->ob[object_id]->image=CloneImage(image,0,0,MagickTrue,
2942             &image->exception);
2943
2944           if (mng_info->ob[object_id]->image != (Image *) NULL)
2945             mng_info->ob[object_id]->image->file=(FILE *) NULL;
2946
2947           else
2948             (void) ThrowMagickException(&image->exception,GetMagickModule(),
2949               ResourceLimitError,"Cloning image for object buffer failed",
2950               "`%s'",image->filename);
2951
2952           if (ping_width > 250000L || ping_height > 250000L)
2953              png_error(ping,"PNG Image dimensions are too large.");
2954
2955           mng_info->ob[object_id]->width=ping_width;
2956           mng_info->ob[object_id]->height=ping_height;
2957           mng_info->ob[object_id]->color_type=ping_color_type;
2958           mng_info->ob[object_id]->sample_depth=ping_bit_depth;
2959           mng_info->ob[object_id]->interlace_method=ping_interlace_method;
2960           mng_info->ob[object_id]->compression_method=
2961              ping_compression_method;
2962           mng_info->ob[object_id]->filter_method=ping_filter_method;
2963
2964           if (png_get_valid(ping,ping_info,PNG_INFO_PLTE))
2965             {
2966               int
2967                 number_colors;
2968
2969               png_colorp
2970                 plte;
2971
2972               /*
2973                 Copy the PLTE to the object buffer.
2974               */
2975               png_get_PLTE(ping,ping_info,&plte,&number_colors);
2976               mng_info->ob[object_id]->plte_length=number_colors;
2977
2978               for (i=0; i < number_colors; i++)
2979               {
2980                 mng_info->ob[object_id]->plte[i]=plte[i];
2981               }
2982             }
2983
2984           else
2985               mng_info->ob[object_id]->plte_length=0;
2986         }
2987     }
2988 #endif
2989   /*
2990     Relinquish resources.
2991   */
2992   png_destroy_read_struct(&ping,&ping_info,&end_info);
2993
2994   ping_pixels=(unsigned char *) RelinquishMagickMemory(ping_pixels);
2995 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
2996   UnlockSemaphoreInfo(ping_semaphore);
2997 #endif
2998
2999   if (logging != MagickFalse)
3000     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3001       "  exit ReadOnePNGImage()");
3002
3003   return(image);
3004
3005 /* end of reading one PNG image */
3006 }
3007
3008 static Image *ReadPNGImage(const ImageInfo *image_info,ExceptionInfo *exception)
3009 {
3010   Image
3011     *image,
3012     *previous;
3013
3014   MagickBooleanType
3015     have_mng_structure,
3016     logging,
3017     status;
3018
3019   MngInfo
3020     *mng_info;
3021
3022   char
3023     magic_number[MaxTextExtent];
3024
3025   ssize_t
3026     count;
3027
3028   /*
3029     Open image file.
3030   */
3031   assert(image_info != (const ImageInfo *) NULL);
3032   assert(image_info->signature == MagickSignature);
3033
3034   if (image_info->debug != MagickFalse)
3035     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
3036       image_info->filename);
3037
3038   assert(exception != (ExceptionInfo *) NULL);
3039   assert(exception->signature == MagickSignature);
3040   logging=LogMagickEvent(CoderEvent,GetMagickModule(),"enter ReadPNGImage()");
3041   image=AcquireImage(image_info);
3042   mng_info=(MngInfo *) NULL;
3043   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
3044
3045   if (status == MagickFalse)
3046     ThrowReaderException(FileOpenError,"UnableToOpenFile");
3047
3048   /*
3049     Verify PNG signature.
3050   */
3051   count=ReadBlob(image,8,(unsigned char *) magic_number);
3052
3053   if (count < 8 || memcmp(magic_number,"\211PNG\r\n\032\n",8) != 0)
3054     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
3055
3056   /*
3057     Allocate a MngInfo structure.
3058   */
3059   have_mng_structure=MagickFalse;
3060   mng_info=(MngInfo *) AcquireMagickMemory(sizeof(MngInfo));
3061
3062   if (mng_info == (MngInfo *) NULL)
3063     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
3064
3065   /*
3066     Initialize members of the MngInfo structure.
3067   */
3068   (void) ResetMagickMemory(mng_info,0,sizeof(MngInfo));
3069   mng_info->image=image;
3070   have_mng_structure=MagickTrue;
3071
3072   previous=image;
3073   image=ReadOnePNGImage(mng_info,image_info,exception);
3074   MngInfoFreeStruct(mng_info,&have_mng_structure);
3075
3076   if (image == (Image *) NULL)
3077     {
3078       if (previous != (Image *) NULL)
3079         {
3080           if (previous->signature != MagickSignature)
3081             ThrowReaderException(CorruptImageError,"CorruptImage");
3082
3083           (void) CloseBlob(previous);
3084           (void) DestroyImageList(previous);
3085         }
3086
3087       if (logging != MagickFalse)
3088         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3089           "exit ReadPNGImage() with error");
3090
3091       return((Image *) NULL);
3092     }
3093
3094   (void) CloseBlob(image);
3095
3096   if ((image->columns == 0) || (image->rows == 0))
3097     {
3098       if (logging != MagickFalse)
3099         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3100           "exit ReadPNGImage() with error.");
3101
3102       ThrowReaderException(CorruptImageError,"CorruptImage");
3103     }
3104
3105   if (LocaleCompare(image_info->magick,"PNG8") == 0)
3106     {
3107       (void) SetImageType(image,PaletteType);
3108
3109       if (image->matte != MagickFalse)
3110         {
3111           /* To do: Reduce to binary transparency */
3112         }
3113     }
3114
3115   if (LocaleCompare(image_info->magick,"PNG24") == 0)
3116     {
3117       (void) SetImageType(image,TrueColorType);
3118       image->matte=MagickFalse;
3119     }
3120
3121   if (LocaleCompare(image_info->magick,"PNG32") == 0)
3122     (void) SetImageType(image,TrueColorMatteType);
3123
3124   if (logging != MagickFalse)
3125     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3126         "  page.w: %.20g, page.h: %.20g,page.x: %.20g, page.y: %.20g.",
3127             (double) image->page.width,(double) image->page.height,
3128             (double) image->page.x,(double) image->page.y);
3129
3130   if (logging != MagickFalse)
3131     (void) LogMagickEvent(CoderEvent,GetMagickModule(),"exit ReadPNGImage()");
3132
3133   return(image);
3134 }
3135
3136
3137
3138 #if defined(JNG_SUPPORTED)
3139 /*
3140 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3141 %                                                                             %
3142 %                                                                             %
3143 %                                                                             %
3144 %   R e a d O n e J N G I m a g e                                             %
3145 %                                                                             %
3146 %                                                                             %
3147 %                                                                             %
3148 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3149 %
3150 %  ReadOneJNGImage() reads a JPEG Network Graphics (JNG) image file
3151 %  (minus the 8-byte signature)  and returns it.  It allocates the memory
3152 %  necessary for the new Image structure and returns a pointer to the new
3153 %  image.
3154 %
3155 %  JNG support written by Glenn Randers-Pehrson, glennrp@image...
3156 %
3157 %  The format of the ReadOneJNGImage method is:
3158 %
3159 %      Image *ReadOneJNGImage(MngInfo *mng_info, const ImageInfo *image_info,
3160 %         ExceptionInfo *exception)
3161 %
3162 %  A description of each parameter follows:
3163 %
3164 %    o mng_info: Specifies a pointer to a MngInfo structure.
3165 %
3166 %    o image_info: the image info.
3167 %
3168 %    o exception: return any errors or warnings in this structure.
3169 %
3170 */
3171 static Image *ReadOneJNGImage(MngInfo *mng_info,
3172     const ImageInfo *image_info, ExceptionInfo *exception)
3173 {
3174   Image
3175     *alpha_image,
3176     *color_image,
3177     *image,
3178     *jng_image;
3179
3180   ImageInfo
3181     *alpha_image_info,
3182     *color_image_info;
3183
3184   MagickBooleanType
3185     logging;
3186
3187   ssize_t
3188     y;
3189
3190   MagickBooleanType
3191     status;
3192
3193   png_uint_32
3194     jng_height,
3195     jng_width;
3196
3197   png_byte
3198     jng_color_type,
3199     jng_image_sample_depth,
3200     jng_image_compression_method,
3201     jng_image_interlace_method,
3202     jng_alpha_sample_depth,
3203     jng_alpha_compression_method,
3204     jng_alpha_filter_method,
3205     jng_alpha_interlace_method;
3206
3207   register const PixelPacket
3208     *s;
3209
3210   register ssize_t
3211     i,
3212     x;
3213
3214   register PixelPacket
3215     *q;
3216
3217   register unsigned char
3218     *p;
3219
3220   unsigned int
3221     read_JSEP,
3222     reading_idat,
3223     skip_to_iend;
3224
3225   size_t
3226     length;
3227
3228   jng_alpha_compression_method=0;
3229   jng_alpha_sample_depth=8;
3230   jng_color_type=0;
3231   jng_height=0;
3232   jng_width=0;
3233   alpha_image=(Image *) NULL;
3234   color_image=(Image *) NULL;
3235   alpha_image_info=(ImageInfo *) NULL;
3236   color_image_info=(ImageInfo *) NULL;
3237
3238   logging=LogMagickEvent(CoderEvent,GetMagickModule(),
3239     "  enter ReadOneJNGImage()");
3240
3241   image=mng_info->image;
3242
3243   if (GetAuthenticPixelQueue(image) != (PixelPacket *) NULL)
3244     {
3245       /*
3246         Allocate next image structure.
3247       */
3248       if (logging != MagickFalse)
3249         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3250            "  AcquireNextImage()");
3251
3252       AcquireNextImage(image_info,image);
3253
3254       if (GetNextImageInList(image) == (Image *) NULL)
3255         return((Image *) NULL);
3256
3257       image=SyncNextImageInList(image);
3258     }
3259   mng_info->image=image;
3260
3261   /*
3262     Signature bytes have already been read.
3263   */
3264
3265   read_JSEP=MagickFalse;
3266   reading_idat=MagickFalse;
3267   skip_to_iend=MagickFalse;
3268   for (;;)
3269   {
3270     char
3271       type[MaxTextExtent];
3272
3273     unsigned char
3274       *chunk;
3275
3276     unsigned int
3277       count;
3278
3279     /*
3280       Read a new JNG chunk.
3281     */
3282     status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
3283       2*GetBlobSize(image));
3284
3285     if (status == MagickFalse)
3286       break;
3287
3288     type[0]='\0';
3289     (void) ConcatenateMagickString(type,"errr",MaxTextExtent);
3290     length=ReadBlobMSBLong(image);
3291     count=(unsigned int) ReadBlob(image,4,(unsigned char *) type);
3292
3293     if (logging != MagickFalse)
3294       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3295         "  Reading JNG chunk type %c%c%c%c, length: %.20g",
3296         type[0],type[1],type[2],type[3],(double) length);
3297
3298     if (length > PNG_UINT_31_MAX || count == 0)
3299       ThrowReaderException(CorruptImageError,"CorruptImage");
3300
3301     p=NULL;
3302     chunk=(unsigned char *) NULL;
3303
3304     if (length)
3305       {
3306         chunk=(unsigned char *) AcquireQuantumMemory(length,sizeof(*chunk));
3307
3308         if (chunk == (unsigned char *) NULL)
3309           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
3310
3311         for (i=0; i < (ssize_t) length; i++)
3312           chunk[i]=(unsigned char) ReadBlobByte(image);
3313
3314         p=chunk;
3315       }
3316
3317     (void) ReadBlobMSBLong(image);  /* read crc word */
3318
3319     if (skip_to_iend)
3320       {
3321         if (length)
3322           chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3323
3324         continue;
3325       }
3326
3327     if (memcmp(type,mng_JHDR,4) == 0)
3328       {
3329         if (length == 16)
3330           {
3331             jng_width=(size_t) ((p[0] << 24) | (p[1] << 16) |
3332                 (p[2] << 8) | p[3]);
3333             jng_height=(size_t) ((p[4] << 24) | (p[5] << 16) |
3334                 (p[6] << 8) | p[7]);
3335             jng_color_type=p[8];
3336             jng_image_sample_depth=p[9];
3337             jng_image_compression_method=p[10];
3338             jng_image_interlace_method=p[11];
3339
3340             image->interlace=jng_image_interlace_method != 0 ? PNGInterlace :
3341               NoInterlace;
3342
3343             jng_alpha_sample_depth=p[12];
3344             jng_alpha_compression_method=p[13];
3345             jng_alpha_filter_method=p[14];
3346             jng_alpha_interlace_method=p[15];
3347
3348             if (logging != MagickFalse)
3349               {
3350                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3351                   "    jng_width:      %16lu",(unsigned long) jng_width);
3352
3353                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3354                   "    jng_width:      %16lu",(unsigned long) jng_height);
3355
3356                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3357                   "    jng_color_type: %16d",jng_color_type);
3358
3359                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3360                   "    jng_image_sample_depth:      %3d",
3361                   jng_image_sample_depth);
3362
3363                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3364                   "    jng_image_compression_method:%3d",
3365                   jng_image_compression_method);
3366
3367                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3368                   "    jng_image_interlace_method:  %3d",
3369                   jng_image_interlace_method);
3370
3371                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3372                   "    jng_alpha_sample_depth:      %3d",
3373                   jng_alpha_sample_depth);
3374
3375                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3376                   "    jng_alpha_compression_method:%3d",
3377                   jng_alpha_compression_method);
3378
3379                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3380                   "    jng_alpha_filter_method:     %3d",
3381                   jng_alpha_filter_method);
3382
3383                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3384                   "    jng_alpha_interlace_method:  %3d",
3385                   jng_alpha_interlace_method);
3386               }
3387           }
3388
3389         if (length)
3390           chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3391
3392         continue;
3393       }
3394
3395
3396     if ((reading_idat == MagickFalse) && (read_JSEP == MagickFalse) &&
3397         ((memcmp(type,mng_JDAT,4) == 0) || (memcmp(type,mng_JdAA,4) == 0) ||
3398          (memcmp(type,mng_IDAT,4) == 0) || (memcmp(type,mng_JDAA,4) == 0)))
3399       {
3400         /*
3401            o create color_image
3402            o open color_blob, attached to color_image
3403            o if (color type has alpha)
3404                open alpha_blob, attached to alpha_image
3405         */
3406
3407         color_image_info=(ImageInfo *)AcquireMagickMemory(sizeof(ImageInfo));
3408
3409         if (color_image_info == (ImageInfo *) NULL)
3410           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
3411
3412         GetImageInfo(color_image_info);
3413         color_image=AcquireImage(color_image_info);
3414
3415         if (color_image == (Image *) NULL)
3416           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
3417
3418         if (logging != MagickFalse)
3419           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3420             "    Creating color_blob.");
3421
3422         (void) AcquireUniqueFilename(color_image->filename);
3423         status=OpenBlob(color_image_info,color_image,WriteBinaryBlobMode,
3424           exception);
3425
3426         if (status == MagickFalse)
3427           return((Image *) NULL);
3428
3429         if ((image_info->ping == MagickFalse) && (jng_color_type >= 12))
3430           {
3431             alpha_image_info=(ImageInfo *)
3432               AcquireMagickMemory(sizeof(ImageInfo));
3433
3434             if (alpha_image_info == (ImageInfo *) NULL)
3435               ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
3436
3437             GetImageInfo(alpha_image_info);
3438             alpha_image=AcquireImage(alpha_image_info);
3439
3440             if (alpha_image == (Image *) NULL)
3441               {
3442                 alpha_image=DestroyImage(alpha_image);
3443                 ThrowReaderException(ResourceLimitError,
3444                   "MemoryAllocationFailed");
3445               }
3446
3447             if (logging != MagickFalse)
3448               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3449                 "    Creating alpha_blob.");
3450
3451             (void) AcquireUniqueFilename(alpha_image->filename);
3452             status=OpenBlob(alpha_image_info,alpha_image,WriteBinaryBlobMode,
3453               exception);
3454
3455             if (status == MagickFalse)
3456               return((Image *) NULL);
3457
3458             if (jng_alpha_compression_method == 0)
3459               {
3460                 unsigned char
3461                   data[18];
3462
3463                 if (logging != MagickFalse)
3464                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3465                     "    Writing IHDR chunk to alpha_blob.");
3466
3467                 (void) WriteBlob(alpha_image,8,(const unsigned char *)
3468                   "\211PNG\r\n\032\n");
3469
3470                 (void) WriteBlobMSBULong(alpha_image,13L);
3471                 PNGType(data,mng_IHDR);
3472                 LogPNGChunk(logging,mng_IHDR,13L);
3473                 PNGLong(data+4,jng_width);
3474                 PNGLong(data+8,jng_height);
3475                 data[12]=jng_alpha_sample_depth;
3476                 data[13]=0; /* color_type gray */
3477                 data[14]=0; /* compression method 0 */
3478                 data[15]=0; /* filter_method 0 */
3479                 data[16]=0; /* interlace_method 0 */
3480                 (void) WriteBlob(alpha_image,17,data);
3481                 (void) WriteBlobMSBULong(alpha_image,crc32(0,data,17));
3482               }
3483           }
3484         reading_idat=MagickTrue;
3485       }
3486
3487     if (memcmp(type,mng_JDAT,4) == 0)
3488       {
3489         /* Copy chunk to color_image->blob */
3490
3491         if (logging != MagickFalse)
3492           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3493             "    Copying JDAT chunk data to color_blob.");
3494
3495         (void) WriteBlob(color_image,length,chunk);
3496
3497         if (length)
3498           chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3499
3500         continue;
3501       }
3502
3503     if (memcmp(type,mng_IDAT,4) == 0)
3504       {
3505         png_byte
3506            data[5];
3507
3508         /* Copy IDAT header and chunk data to alpha_image->blob */
3509
3510         if (image_info->ping == MagickFalse)
3511           {
3512             if (logging != MagickFalse)
3513               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3514                 "    Copying IDAT chunk data to alpha_blob.");
3515
3516             (void) WriteBlobMSBULong(alpha_image,(size_t) length);
3517             PNGType(data,mng_IDAT);
3518             LogPNGChunk(logging,mng_IDAT,length);
3519             (void) WriteBlob(alpha_image,4,data);
3520             (void) WriteBlob(alpha_image,length,chunk);
3521             (void) WriteBlobMSBULong(alpha_image,
3522               crc32(crc32(0,data,4),chunk,(uInt) length));
3523           }
3524
3525         if (length)
3526           chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3527
3528         continue;
3529       }
3530
3531     if ((memcmp(type,mng_JDAA,4) == 0) || (memcmp(type,mng_JdAA,4) == 0))
3532       {
3533         /* Copy chunk data to alpha_image->blob */
3534
3535         if (image_info->ping == MagickFalse)
3536           {
3537             if (logging != MagickFalse)
3538               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3539                 "    Copying JDAA chunk data to alpha_blob.");
3540
3541             (void) WriteBlob(alpha_image,length,chunk);
3542           }
3543
3544         if (length)
3545           chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3546
3547         continue;
3548       }
3549
3550     if (memcmp(type,mng_JSEP,4) == 0)
3551       {
3552         read_JSEP=MagickTrue;
3553
3554         if (length)
3555           chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3556
3557         continue;
3558       }
3559
3560     if (memcmp(type,mng_bKGD,4) == 0)
3561       {
3562         if (length == 2)
3563           {
3564             image->background_color.red=ScaleCharToQuantum(p[1]);
3565             image->background_color.green=image->background_color.red;
3566             image->background_color.blue=image->background_color.red;
3567           }
3568
3569         if (length == 6)
3570           {
3571             image->background_color.red=ScaleCharToQuantum(p[1]);
3572             image->background_color.green=ScaleCharToQuantum(p[3]);
3573             image->background_color.blue=ScaleCharToQuantum(p[5]);
3574           }
3575
3576         chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3577         continue;
3578       }
3579
3580     if (memcmp(type,mng_gAMA,4) == 0)
3581       {
3582         if (length == 4)
3583           image->gamma=((float) mng_get_long(p))*0.00001;
3584
3585         chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3586         continue;
3587       }
3588
3589     if (memcmp(type,mng_cHRM,4) == 0)
3590       {
3591         if (length == 32)
3592           {
3593             image->chromaticity.white_point.x=0.00001*mng_get_long(p);
3594             image->chromaticity.white_point.y=0.00001*mng_get_long(&p[4]);
3595             image->chromaticity.red_primary.x=0.00001*mng_get_long(&p[8]);
3596             image->chromaticity.red_primary.y=0.00001*mng_get_long(&p[12]);
3597             image->chromaticity.green_primary.x=0.00001*mng_get_long(&p[16]);
3598             image->chromaticity.green_primary.y=0.00001*mng_get_long(&p[20]);
3599             image->chromaticity.blue_primary.x=0.00001*mng_get_long(&p[24]);
3600             image->chromaticity.blue_primary.y=0.00001*mng_get_long(&p[28]);
3601           }
3602
3603         chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3604         continue;
3605       }
3606
3607     if (memcmp(type,mng_sRGB,4) == 0)
3608       {
3609         if (length == 1)
3610           {
3611             image->rendering_intent=
3612               Magick_RenderingIntent_from_PNG_RenderingIntent(p[0]);
3613             image->gamma=0.45455f;
3614             image->chromaticity.red_primary.x=0.6400f;
3615             image->chromaticity.red_primary.y=0.3300f;
3616             image->chromaticity.green_primary.x=0.3000f;
3617             image->chromaticity.green_primary.y=0.6000f;
3618             image->chromaticity.blue_primary.x=0.1500f;
3619             image->chromaticity.blue_primary.y=0.0600f;
3620             image->chromaticity.white_point.x=0.3127f;
3621             image->chromaticity.white_point.y=0.3290f;
3622           }
3623
3624         chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3625         continue;
3626       }
3627
3628     if (memcmp(type,mng_oFFs,4) == 0)
3629       {
3630         if (length > 8)
3631           {
3632             image->page.x=(ssize_t) mng_get_long(p);
3633             image->page.y=(ssize_t) mng_get_long(&p[4]);
3634
3635             if ((int) p[8] != 0)
3636               {
3637                 image->page.x/=10000;
3638                 image->page.y/=10000;
3639               }
3640           }
3641
3642         if (length)
3643           chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3644
3645         continue;
3646       }
3647
3648     if (memcmp(type,mng_pHYs,4) == 0)
3649       {
3650         if (length > 8)
3651           {
3652             image->x_resolution=(double) mng_get_long(p);
3653             image->y_resolution=(double) mng_get_long(&p[4]);
3654             if ((int) p[8] == PNG_RESOLUTION_METER)
3655               {
3656                 image->units=PixelsPerCentimeterResolution;
3657                 image->x_resolution=image->x_resolution/100.0f;
3658                 image->y_resolution=image->y_resolution/100.0f;
3659               }
3660           }
3661
3662         chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3663         continue;
3664       }
3665
3666 #if 0
3667     if (memcmp(type,mng_iCCP,4) == 0)
3668       {
3669         /* To do. */
3670         if (length)
3671           chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3672
3673         continue;
3674       }
3675 #endif
3676
3677     if (length)
3678       chunk=(unsigned char *) RelinquishMagickMemory(chunk);
3679
3680     if (memcmp(type,mng_IEND,4))
3681       continue;
3682
3683     break;
3684   }
3685
3686
3687   /* IEND found */
3688
3689   /*
3690     Finish up reading image data:
3691
3692        o read main image from color_blob.
3693
3694        o close color_blob.
3695
3696        o if (color_type has alpha)
3697             if alpha_encoding is PNG
3698                read secondary image from alpha_blob via ReadPNG
3699             if alpha_encoding is JPEG
3700                read secondary image from alpha_blob via ReadJPEG
3701
3702        o close alpha_blob.
3703
3704        o copy intensity of secondary image into
3705          opacity samples of main image.
3706
3707        o destroy the secondary image.
3708   */
3709
3710   (void) CloseBlob(color_image);
3711
3712   if (logging != MagickFalse)
3713     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3714       "    Reading jng_image from color_blob.");
3715
3716   (void) FormatMagickString(color_image_info->filename,MaxTextExtent,"%s",
3717     color_image->filename);
3718
3719   color_image_info->ping=MagickFalse;   /* To do: avoid this */
3720   jng_image=ReadImage(color_image_info,exception);
3721
3722   if (jng_image == (Image *) NULL)
3723     return((Image *) NULL);
3724
3725   (void) RelinquishUniqueFileResource(color_image->filename);
3726   color_image=DestroyImage(color_image);
3727   color_image_info=DestroyImageInfo(color_image_info);
3728
3729   if (jng_image == (Image *) NULL)
3730     return((Image *) NULL);
3731
3732   if (logging != MagickFalse)
3733     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3734       "    Copying jng_image pixels to main image.");
3735
3736   image->rows=jng_height;
3737   image->columns=jng_width;
3738   length=image->columns*sizeof(PixelPacket);
3739
3740   for (y=0; y < (ssize_t) image->rows; y++)
3741   {
3742     s=GetVirtualPixels(jng_image,0,y,image->columns,1,&image->exception);
3743     q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
3744     (void) CopyMagickMemory(q,s,length);
3745
3746     if (SyncAuthenticPixels(image,exception) == MagickFalse)
3747       break;
3748   }
3749
3750   jng_image=DestroyImage(jng_image);
3751
3752   if (image_info->ping == MagickFalse)
3753     {
3754      if (jng_color_type >= 12)
3755        {
3756          if (jng_alpha_compression_method == 0)
3757            {
3758              png_byte
3759                data[5];
3760              (void) WriteBlobMSBULong(alpha_image,0x00000000L);
3761              PNGType(data,mng_IEND);
3762              LogPNGChunk(logging,mng_IEND,0L);
3763              (void) WriteBlob(alpha_image,4,data);
3764              (void) WriteBlobMSBULong(alpha_image,crc32(0,data,4));
3765            }
3766
3767          (void) CloseBlob(alpha_image);
3768
3769          if (logging != MagickFalse)
3770            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3771              "    Reading opacity from alpha_blob.");
3772
3773          (void) FormatMagickString(alpha_image_info->filename,MaxTextExtent,
3774            "%s",alpha_image->filename);
3775
3776          jng_image=ReadImage(alpha_image_info,exception);
3777
3778          if (jng_image != (Image *) NULL)
3779            for (y=0; y < (ssize_t) image->rows; y++)
3780            {
3781              s=GetVirtualPixels(jng_image,0,y,image->columns,1,
3782                 &image->exception);
3783              q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
3784
3785              if (image->matte != MagickFalse)
3786                for (x=(ssize_t) image->columns; x != 0; x--,q++,s++)
3787                   q->opacity=(Quantum) QuantumRange-s->red;
3788
3789              else
3790                for (x=(ssize_t) image->columns; x != 0; x--,q++,s++)
3791                {
3792                   q->opacity=(Quantum) QuantumRange-s->red;
3793                   if (q->opacity != OpaqueOpacity)
3794                     image->matte=MagickTrue;
3795                }
3796
3797              if (SyncAuthenticPixels(image,exception) == MagickFalse)
3798                break;
3799            }
3800          (void) RelinquishUniqueFileResource(alpha_image->filename);
3801          alpha_image=DestroyImage(alpha_image);
3802          alpha_image_info=DestroyImageInfo(alpha_image_info);
3803          if (jng_image != (Image *) NULL)
3804            jng_image=DestroyImage(jng_image);
3805        }
3806     }
3807
3808   /* Read the JNG image.  */
3809
3810   if (mng_info->mng_type == 0)
3811     {
3812       mng_info->mng_width=jng_width;
3813       mng_info->mng_height=jng_height;
3814     }
3815
3816   if (image->page.width == 0 && image->page.height == 0)
3817     {
3818       image->page.width=jng_width;
3819       image->page.height=jng_height;
3820     }
3821
3822   if (image->page.x == 0 && image->page.y == 0)
3823     {
3824       image->page.x=mng_info->x_off[mng_info->object_id];
3825       image->page.y=mng_info->y_off[mng_info->object_id];
3826     }
3827
3828   else
3829     {
3830       image->page.y=mng_info->y_off[mng_info->object_id];
3831     }
3832
3833   mng_info->image_found++;
3834   status=SetImageProgress(image,LoadImagesTag,2*TellBlob(image),
3835     2*GetBlobSize(image));
3836
3837   if (logging != MagickFalse)
3838     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3839       "  exit ReadOneJNGImage()");
3840
3841   return(image);
3842 }
3843
3844 /*
3845 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3846 %                                                                             %
3847 %                                                                             %
3848 %                                                                             %
3849 %   R e a d J N G I m a g e                                                   %
3850 %                                                                             %
3851 %                                                                             %
3852 %                                                                             %
3853 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3854 %
3855 %  ReadJNGImage() reads a JPEG Network Graphics (JNG) image file
3856 %  (including the 8-byte signature)  and returns it.  It allocates the memory
3857 %  necessary for the new Image structure and returns a pointer to the new
3858 %  image.
3859 %
3860 %  JNG support written by Glenn Randers-Pehrson, glennrp@image...
3861 %
3862 %  The format of the ReadJNGImage method is:
3863 %
3864 %      Image *ReadJNGImage(const ImageInfo *image_info, ExceptionInfo
3865 %         *exception)
3866 %
3867 %  A description of each parameter follows:
3868 %
3869 %    o image_info: the image info.
3870 %
3871 %    o exception: return any errors or warnings in this structure.
3872 %
3873 */
3874
3875 static Image *ReadJNGImage(const ImageInfo *image_info,ExceptionInfo *exception)
3876 {
3877   Image
3878     *image,
3879     *previous;
3880
3881   MagickBooleanType
3882     have_mng_structure,
3883     logging,
3884     status;
3885
3886   MngInfo
3887     *mng_info;
3888
3889   char
3890     magic_number[MaxTextExtent];
3891
3892   size_t
3893     count;
3894
3895   /*
3896     Open image file.
3897   */
3898   assert(image_info != (const ImageInfo *) NULL);
3899   assert(image_info->signature == MagickSignature);
3900   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image_info->filename);
3901   assert(exception != (ExceptionInfo *) NULL);
3902   assert(exception->signature == MagickSignature);
3903   logging=LogMagickEvent(CoderEvent,GetMagickModule(),"enter ReadJNGImage()");
3904   image=AcquireImage(image_info);
3905   mng_info=(MngInfo *) NULL;
3906   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
3907
3908   if (status == MagickFalse)
3909     return((Image *) NULL);
3910
3911   if (LocaleCompare(image_info->magick,"JNG") != 0)
3912     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
3913
3914   /* Verify JNG signature.  */
3915
3916   count=(size_t) ReadBlob(image,8,(unsigned char *) magic_number);
3917
3918   if (count < 8 || memcmp(magic_number,"\213JNG\r\n\032\n",8) != 0)
3919     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
3920
3921   /* Allocate a MngInfo structure.  */
3922
3923   have_mng_structure=MagickFalse;
3924   mng_info=(MngInfo *) AcquireMagickMemory(sizeof(*mng_info));
3925
3926   if (mng_info == (MngInfo *) NULL)
3927     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
3928
3929   /* Initialize members of the MngInfo structure.  */
3930
3931   (void) ResetMagickMemory(mng_info,0,sizeof(MngInfo));
3932   have_mng_structure=MagickTrue;
3933
3934   mng_info->image=image;
3935   previous=image;
3936   image=ReadOneJNGImage(mng_info,image_info,exception);
3937   MngInfoFreeStruct(mng_info,&have_mng_structure);
3938
3939   if (image == (Image *) NULL)
3940     {
3941       if (IsImageObject(previous) != MagickFalse)
3942         {
3943           (void) CloseBlob(previous);
3944           (void) DestroyImageList(previous);
3945         }
3946
3947       if (logging != MagickFalse)
3948         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3949           "exit ReadJNGImage() with error");
3950
3951       return((Image *) NULL);
3952     }
3953   (void) CloseBlob(image);
3954
3955   if (image->columns == 0 || image->rows == 0)
3956     {
3957       if (logging != MagickFalse)
3958         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
3959           "exit ReadJNGImage() with error");
3960
3961       ThrowReaderException(CorruptImageError,"CorruptImage");
3962     }
3963
3964   if (logging != MagickFalse)
3965     (void) LogMagickEvent(CoderEvent,GetMagickModule(),"exit ReadJNGImage()");
3966
3967   return(image);
3968 }
3969 #endif
3970
3971 static Image *ReadMNGImage(const ImageInfo *image_info,ExceptionInfo *exception)
3972 {
3973   char
3974     page_geometry[MaxTextExtent];
3975
3976   Image
3977     *image,
3978     *previous;
3979
3980   MagickBooleanType
3981     logging,
3982     have_mng_structure;
3983
3984   volatile int
3985     first_mng_object,
3986     object_id,
3987     term_chunk_found,
3988     skip_to_iend;
3989
3990   volatile ssize_t
3991     image_count=0;
3992
3993   MagickBooleanType
3994     status;
3995
3996   MagickOffsetType
3997     offset;
3998
3999   MngInfo
4000     *mng_info;
4001
4002   MngBox
4003     default_fb,
4004     fb,
4005     previous_fb;
4006
4007 #if defined(MNG_INSERT_LAYERS)
4008   PixelPacket
4009     mng_background_color;
4010 #endif
4011
4012   register unsigned char
4013     *p;
4014
4015   register ssize_t
4016     i;
4017
4018   size_t
4019     count;
4020
4021   ssize_t
4022     loop_level;
4023
4024   volatile short
4025     skipping_loop;
4026
4027 #if defined(MNG_INSERT_LAYERS)
4028   unsigned int
4029     mandatory_back=0;
4030 #endif
4031
4032   volatile unsigned int
4033 #ifdef MNG_OBJECT_BUFFERS
4034     mng_background_object=0,
4035 #endif
4036     mng_type=0;   /* 0: PNG or JNG; 1: MNG; 2: MNG-LC; 3: MNG-VLC */
4037
4038   size_t
4039     default_frame_timeout,
4040     frame_timeout,
4041 #if defined(MNG_INSERT_LAYERS)
4042     image_height,
4043     image_width,
4044 #endif
4045     length;
4046
4047   /* These delays are all measured in image ticks_per_second,
4048    * not in MNG ticks_per_second
4049    */
4050   volatile size_t
4051     default_frame_delay,
4052     final_delay,
4053     final_image_delay,
4054     frame_delay,
4055 #if defined(MNG_INSERT_LAYERS)
4056     insert_layers,
4057 #endif
4058     mng_iterations=1,
4059     simplicity=0,
4060     subframe_height=0,
4061     subframe_width=0;
4062
4063   previous_fb.top=0;
4064   previous_fb.bottom=0;
4065   previous_fb.left=0;
4066   previous_fb.right=0;
4067   default_fb.top=0;
4068   default_fb.bottom=0;
4069   default_fb.left=0;
4070   default_fb.right=0;
4071
4072   /* Open image file.  */
4073
4074   assert(image_info != (const ImageInfo *) NULL);
4075   assert(image_info->signature == MagickSignature);
4076   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image_info->filename);
4077   assert(exception != (ExceptionInfo *) NULL);
4078   assert(exception->signature == MagickSignature);
4079   logging=LogMagickEvent(CoderEvent,GetMagickModule(),"enter ReadMNGImage()");
4080   image=AcquireImage(image_info);
4081   mng_info=(MngInfo *) NULL;
4082   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
4083
4084   if (status == MagickFalse)
4085     return((Image *) NULL);
4086
4087   first_mng_object=MagickFalse;
4088   skipping_loop=(-1);
4089   have_mng_structure=MagickFalse;
4090
4091   /* Allocate a MngInfo structure.  */
4092
4093   mng_info=(MngInfo *) AcquireMagickMemory(sizeof(MngInfo));
4094
4095   if (mng_info == (MngInfo *) NULL)
4096     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
4097
4098   /* Initialize members of the MngInfo structure.  */
4099
4100   (void) ResetMagickMemory(mng_info,0,sizeof(MngInfo));
4101   mng_info->image=image;
4102   have_mng_structure=MagickTrue;
4103
4104   if (LocaleCompare(image_info->magick,"MNG") == 0)
4105     {
4106       char
4107         magic_number[MaxTextExtent];
4108
4109       /* Verify MNG signature.  */
4110       count=(size_t) ReadBlob(image,8,(unsigned char *) magic_number);
4111       if (memcmp(magic_number,"\212MNG\r\n\032\n",8) != 0)
4112         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
4113
4114       /* Initialize some nonzero members of the MngInfo structure.  */
4115       for (i=0; i < MNG_MAX_OBJECTS; i++)
4116       {
4117         mng_info->object_clip[i].right=(ssize_t) PNG_UINT_31_MAX;
4118         mng_info->object_clip[i].bottom=(ssize_t) PNG_UINT_31_MAX;
4119       }
4120       mng_info->exists[0]=MagickTrue;
4121     }
4122
4123   first_mng_object=MagickTrue;
4124   mng_type=0;
4125 #if defined(MNG_INSERT_LAYERS)
4126   insert_layers=MagickFalse; /* should be False when converting or mogrifying */
4127 #endif
4128   default_frame_delay=0;
4129   default_frame_timeout=0;
4130   frame_delay=0;
4131   final_delay=1;
4132   mng_info->ticks_per_second=1UL*image->ticks_per_second;
4133   object_id=0;
4134   skip_to_iend=MagickFalse;
4135   term_chunk_found=MagickFalse;
4136   mng_info->framing_mode=1;
4137 #if defined(MNG_INSERT_LAYERS)
4138   mandatory_back=MagickFalse;
4139 #endif
4140 #if defined(MNG_INSERT_LAYERS)
4141   mng_background_color=image->background_color;
4142 #endif
4143   default_fb=mng_info->frame;
4144   previous_fb=mng_info->frame;
4145   do
4146   {
4147     char
4148       type[MaxTextExtent];
4149
4150     if (LocaleCompare(image_info->magick,"MNG") == 0)
4151       {
4152         unsigned char
4153           *chunk;
4154
4155         /*
4156           Read a new chunk.
4157         */
4158         type[0]='\0';
4159         (void) ConcatenateMagickString(type,"errr",MaxTextExtent);
4160         length=ReadBlobMSBLong(image);
4161         count=(size_t) ReadBlob(image,4,(unsigned char *) type);
4162
4163         if (logging != MagickFalse)
4164           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4165            "  Reading MNG chunk type %c%c%c%c, length: %.20g",
4166            type[0],type[1],type[2],type[3],(double) length);
4167
4168         if (length > PNG_UINT_31_MAX)
4169           status=MagickFalse;
4170
4171         if (count == 0)
4172           ThrowReaderException(CorruptImageError,"CorruptImage");
4173
4174         p=NULL;
4175         chunk=(unsigned char *) NULL;
4176
4177         if (length)
4178           {
4179             chunk=(unsigned char *) AcquireQuantumMemory(length,sizeof(*chunk));
4180
4181             if (chunk == (unsigned char *) NULL)
4182               ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
4183
4184             for (i=0; i < (ssize_t) length; i++)
4185               chunk[i]=(unsigned char) ReadBlobByte(image);
4186
4187             p=chunk;
4188           }
4189
4190         (void) ReadBlobMSBLong(image);  /* read crc word */
4191
4192 #if !defined(JNG_SUPPORTED)
4193         if (memcmp(type,mng_JHDR,4) == 0)
4194           {
4195             skip_to_iend=MagickTrue;
4196
4197             if (mng_info->jhdr_warning == 0)
4198               (void) ThrowMagickException(&image->exception,GetMagickModule(),
4199                 CoderError,"JNGCompressNotSupported","`%s'",image->filename);
4200
4201             mng_info->jhdr_warning++;
4202           }
4203 #endif
4204         if (memcmp(type,mng_DHDR,4) == 0)
4205           {
4206             skip_to_iend=MagickTrue;
4207
4208             if (mng_info->dhdr_warning == 0)
4209               (void) ThrowMagickException(&image->exception,GetMagickModule(),
4210                 CoderError,"DeltaPNGNotSupported","`%s'",image->filename);
4211
4212             mng_info->dhdr_warning++;
4213           }
4214         if (memcmp(type,mng_MEND,4) == 0)
4215           break;
4216
4217         if (skip_to_iend)
4218           {
4219             if (memcmp(type,mng_IEND,4) == 0)
4220               skip_to_iend=MagickFalse;
4221
4222             if (length)
4223               chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4224
4225             if (logging != MagickFalse)
4226               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4227                 "  Skip to IEND.");
4228
4229             continue;
4230           }
4231
4232         if (memcmp(type,mng_MHDR,4) == 0)
4233           {
4234             mng_info->mng_width=(size_t) ((p[0] << 24) | (p[1] << 16) |
4235                 (p[2] << 8) | p[3]);
4236
4237             mng_info->mng_height=(size_t) ((p[4] << 24) | (p[5] << 16) |
4238                 (p[6] << 8) | p[7]);
4239
4240             if (logging != MagickFalse)
4241               {
4242                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4243                   "  MNG width: %.20g",(double) mng_info->mng_width);
4244                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4245                   "  MNG height: %.20g",(double) mng_info->mng_height);
4246               }
4247
4248             p+=8;
4249             mng_info->ticks_per_second=(size_t) mng_get_long(p);
4250
4251             if (mng_info->ticks_per_second == 0)
4252               default_frame_delay=0;
4253
4254             else
4255               default_frame_delay=1UL*image->ticks_per_second/
4256                 mng_info->ticks_per_second;
4257
4258             frame_delay=default_frame_delay;
4259             simplicity=0;
4260
4261             if (length > 16)
4262               {
4263                 p+=16;
4264                 simplicity=(size_t) mng_get_long(p);
4265               }
4266
4267             mng_type=1;    /* Full MNG */
4268
4269             if ((simplicity != 0) && ((simplicity | 11) == 11))
4270               mng_type=2; /* LC */
4271
4272             if ((simplicity != 0) && ((simplicity | 9) == 9))
4273               mng_type=3; /* VLC */
4274
4275 #if defined(MNG_INSERT_LAYERS)
4276             if (mng_type != 3)
4277               insert_layers=MagickTrue;
4278 #endif
4279             if (GetAuthenticPixelQueue(image) != (PixelPacket *) NULL)
4280               {
4281                 /* Allocate next image structure.  */
4282                 AcquireNextImage(image_info,image);
4283
4284                 if (GetNextImageInList(image) == (Image *) NULL)
4285                   return((Image *) NULL);
4286
4287                 image=SyncNextImageInList(image);
4288                 mng_info->image=image;
4289               }
4290
4291             if ((mng_info->mng_width > 65535L) ||
4292                 (mng_info->mng_height > 65535L))
4293               ThrowReaderException(ImageError,"WidthOrHeightExceedsLimit");
4294
4295             (void) FormatMagickString(page_geometry,MaxTextExtent,
4296               "%.20gx%.20g+0+0",(double) mng_info->mng_width,(double)
4297               mng_info->mng_height);
4298
4299             mng_info->frame.left=0;
4300             mng_info->frame.right=(ssize_t) mng_info->mng_width;
4301             mng_info->frame.top=0;
4302             mng_info->frame.bottom=(ssize_t) mng_info->mng_height;
4303             mng_info->clip=default_fb=previous_fb=mng_info->frame;
4304
4305             for (i=0; i < MNG_MAX_OBJECTS; i++)
4306               mng_info->object_clip[i]=mng_info->frame;
4307
4308             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4309             continue;
4310           }
4311
4312         if (memcmp(type,mng_TERM,4) == 0)
4313           {
4314             int
4315               repeat=0;
4316
4317
4318             if (length)
4319               repeat=p[0];
4320
4321             if (repeat == 3)
4322               {
4323                 final_delay=(png_uint_32) mng_get_long(&p[2]);
4324                 mng_iterations=(png_uint_32) mng_get_long(&p[6]);
4325
4326                 if (mng_iterations == PNG_UINT_31_MAX)
4327                   mng_iterations=0;
4328
4329                 image->iterations=mng_iterations;
4330                 term_chunk_found=MagickTrue;
4331               }
4332
4333             if (logging != MagickFalse)
4334               {
4335                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4336                   "    repeat=%d",repeat);
4337
4338                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4339                   "    final_delay=%.20g",(double) final_delay);
4340
4341                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4342                   "    image->iterations=%.20g",(double) image->iterations);
4343               }
4344
4345             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4346             continue;
4347           }
4348         if (memcmp(type,mng_DEFI,4) == 0)
4349           {
4350             if (mng_type == 3)
4351               (void) ThrowMagickException(&image->exception,GetMagickModule(),
4352                 CoderError,"DEFI chunk found in MNG-VLC datastream","`%s'",
4353                 image->filename);
4354
4355             object_id=(p[0] << 8) | p[1];
4356
4357             if (mng_type == 2 && object_id != 0)
4358               (void) ThrowMagickException(&image->exception,GetMagickModule(),
4359                 CoderError,"Nonzero object_id in MNG-LC datastream","`%s'",
4360                 image->filename);
4361
4362             if (object_id > MNG_MAX_OBJECTS)
4363               {
4364                 /*
4365                   Instead ofsuing a warning we should allocate a larger
4366                   MngInfo structure and continue.
4367                 */
4368                 (void) ThrowMagickException(&image->exception,GetMagickModule(),
4369                   CoderError,"object id too large","`%s'",image->filename);
4370                 object_id=MNG_MAX_OBJECTS;
4371               }
4372
4373             if (mng_info->exists[object_id])
4374               if (mng_info->frozen[object_id])
4375                 {
4376                   chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4377                   (void) ThrowMagickException(&image->exception,
4378                     GetMagickModule(),CoderError,
4379                     "DEFI cannot redefine a frozen MNG object","`%s'",
4380                     image->filename);
4381                   continue;
4382                 }
4383
4384             mng_info->exists[object_id]=MagickTrue;
4385
4386             if (length > 2)
4387               mng_info->invisible[object_id]=p[2];
4388
4389             /*
4390               Extract object offset info.
4391             */
4392             if (length > 11)
4393               {
4394                 mng_info->x_off[object_id]=(ssize_t) ((p[4] << 24) |
4395                     (p[5] << 16) | (p[6] << 8) | p[7]);
4396
4397                 mng_info->y_off[object_id]=(ssize_t) ((p[8] << 24) |
4398                     (p[9] << 16) | (p[10] << 8) | p[11]);
4399
4400                 if (logging != MagickFalse)
4401                   {
4402                     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4403                       "  x_off[%d]: %.20g",object_id,(double)
4404                       mng_info->x_off[object_id]);
4405
4406                     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4407                       "  y_off[%d]: %.20g",object_id,(double)
4408                       mng_info->y_off[object_id]);
4409                   }
4410               }
4411
4412             /*
4413               Extract object clipping info.
4414             */
4415             if (length > 27)
4416               mng_info->object_clip[object_id]=mng_read_box(mng_info->frame,0,
4417                 &p[12]);
4418
4419             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4420             continue;
4421           }
4422         if (memcmp(type,mng_bKGD,4) == 0)
4423           {
4424             mng_info->have_global_bkgd=MagickFalse;
4425
4426             if (length > 5)
4427               {
4428                 mng_info->mng_global_bkgd.red=
4429                   ScaleShortToQuantum((unsigned short) ((p[0] << 8) | p[1]));
4430
4431                 mng_info->mng_global_bkgd.green=
4432                   ScaleShortToQuantum((unsigned short) ((p[2] << 8) | p[3]));
4433
4434                 mng_info->mng_global_bkgd.blue=
4435                   ScaleShortToQuantum((unsigned short) ((p[4] << 8) | p[5]));
4436
4437                 mng_info->have_global_bkgd=MagickTrue;
4438               }
4439
4440             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4441             continue;
4442           }
4443         if (memcmp(type,mng_BACK,4) == 0)
4444           {
4445 #if defined(MNG_INSERT_LAYERS)
4446             if (length > 6)
4447               mandatory_back=p[6];
4448
4449             else
4450               mandatory_back=0;
4451
4452             if (mandatory_back && length > 5)
4453               {
4454                 mng_background_color.red=
4455                     ScaleShortToQuantum((unsigned short) ((p[0] << 8) | p[1]));
4456
4457                 mng_background_color.green=
4458                     ScaleShortToQuantum((unsigned short) ((p[2] << 8) | p[3]));
4459
4460                 mng_background_color.blue=
4461                     ScaleShortToQuantum((unsigned short) ((p[4] << 8) | p[5]));
4462
4463                 mng_background_color.opacity=OpaqueOpacity;
4464               }
4465
4466 #ifdef MNG_OBJECT_BUFFERS
4467             if (length > 8)
4468               mng_background_object=(p[7] << 8) | p[8];
4469 #endif
4470 #endif
4471             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4472             continue;
4473           }
4474
4475         if (memcmp(type,mng_PLTE,4) == 0)
4476           {
4477             /* Read global PLTE.  */
4478
4479             if (length && (length < 769))
4480               {
4481                 if (mng_info->global_plte == (png_colorp) NULL)
4482                   mng_info->global_plte=(png_colorp) AcquireQuantumMemory(256,
4483                     sizeof(*mng_info->global_plte));
4484
4485                 for (i=0; i < (ssize_t) (length/3); i++)
4486                 {
4487                   mng_info->global_plte[i].red=p[3*i];
4488                   mng_info->global_plte[i].green=p[3*i+1];
4489                   mng_info->global_plte[i].blue=p[3*i+2];
4490                 }
4491
4492                 mng_info->global_plte_length=(unsigned int) (length/3);
4493               }
4494 #ifdef MNG_LOOSE
4495             for ( ; i < 256; i++)
4496             {
4497               mng_info->global_plte[i].red=i;
4498               mng_info->global_plte[i].green=i;
4499               mng_info->global_plte[i].blue=i;
4500             }
4501
4502             if (length)
4503               mng_info->global_plte_length=256;
4504 #endif
4505             else
4506               mng_info->global_plte_length=0;
4507
4508             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4509             continue;
4510           }
4511
4512         if (memcmp(type,mng_tRNS,4) == 0)
4513           {
4514             /* read global tRNS */
4515
4516             if (length < 257)
4517               for (i=0; i < (ssize_t) length; i++)
4518                 mng_info->global_trns[i]=p[i];
4519
4520 #ifdef MNG_LOOSE
4521             for ( ; i < 256; i++)
4522               mng_info->global_trns[i]=255;
4523 #endif
4524             mng_info->global_trns_length=(unsigned int) length;
4525             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4526             continue;
4527           }
4528         if (memcmp(type,mng_gAMA,4) == 0)
4529           {
4530             if (length == 4)
4531               {
4532                 ssize_t
4533                   igamma;
4534
4535                 igamma=mng_get_long(p);
4536                 mng_info->global_gamma=((float) igamma)*0.00001;
4537                 mng_info->have_global_gama=MagickTrue;
4538               }
4539
4540             else
4541               mng_info->have_global_gama=MagickFalse;
4542
4543             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4544             continue;
4545           }
4546
4547         if (memcmp(type,mng_cHRM,4) == 0)
4548           {
4549             /* Read global cHRM */
4550
4551             if (length == 32)
4552               {
4553                 mng_info->global_chrm.white_point.x=0.00001*mng_get_long(p);
4554                 mng_info->global_chrm.white_point.y=0.00001*mng_get_long(&p[4]);
4555                 mng_info->global_chrm.red_primary.x=0.00001*mng_get_long(&p[8]);
4556                 mng_info->global_chrm.red_primary.y=0.00001*
4557                   mng_get_long(&p[12]);
4558                 mng_info->global_chrm.green_primary.x=0.00001*
4559                   mng_get_long(&p[16]);
4560                 mng_info->global_chrm.green_primary.y=0.00001*
4561                   mng_get_long(&p[20]);
4562                 mng_info->global_chrm.blue_primary.x=0.00001*
4563                   mng_get_long(&p[24]);
4564                 mng_info->global_chrm.blue_primary.y=0.00001*
4565                   mng_get_long(&p[28]);
4566                 mng_info->have_global_chrm=MagickTrue;
4567               }
4568             else
4569               mng_info->have_global_chrm=MagickFalse;
4570
4571             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4572             continue;
4573           }
4574
4575         if (memcmp(type,mng_sRGB,4) == 0)
4576           {
4577             /*
4578               Read global sRGB.
4579             */
4580             if (length)
4581               {
4582                 mng_info->global_srgb_intent=
4583                   Magick_RenderingIntent_from_PNG_RenderingIntent(p[0]);
4584                 mng_info->have_global_srgb=MagickTrue;
4585               }
4586             else
4587               mng_info->have_global_srgb=MagickFalse;
4588
4589             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4590             continue;
4591           }
4592
4593         if (memcmp(type,mng_iCCP,4) == 0)
4594           {
4595             /* To do. */
4596
4597             /*
4598               Read global iCCP.
4599             */
4600             if (length)
4601               chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4602
4603             continue;
4604           }
4605
4606         if (memcmp(type,mng_FRAM,4) == 0)
4607           {
4608             if (mng_type == 3)
4609               (void) ThrowMagickException(&image->exception,GetMagickModule(),
4610                 CoderError,"FRAM chunk found in MNG-VLC datastream","`%s'",
4611                 image->filename);
4612
4613             if ((mng_info->framing_mode == 2) || (mng_info->framing_mode == 4))
4614               image->delay=frame_delay;
4615
4616             frame_delay=default_frame_delay;
4617             frame_timeout=default_frame_timeout;
4618             fb=default_fb;
4619
4620             if (length)
4621               if (p[0])
4622                 mng_info->framing_mode=p[0];
4623
4624             if (logging != MagickFalse)
4625               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4626                 "    Framing_mode=%d",mng_info->framing_mode);
4627
4628             if (length > 6)
4629               {
4630                 /* Note the delay and frame clipping boundaries.  */
4631
4632                 p++; /* framing mode */
4633
4634                 while (*p && ((p-chunk) < (ssize_t) length))
4635                   p++;  /* frame name */
4636
4637                 p++;  /* frame name terminator */
4638
4639                 if ((p-chunk) < (ssize_t) (length-4))
4640                   {
4641                     int
4642                       change_delay,
4643                       change_timeout,
4644                       change_clipping;
4645
4646                     change_delay=(*p++);
4647                     change_timeout=(*p++);
4648                     change_clipping=(*p++);
4649                     p++; /* change_sync */
4650
4651                     if (change_delay)
4652                       {
4653                         frame_delay=1UL*image->ticks_per_second*
4654                           mng_get_long(p);
4655
4656                         if (mng_info->ticks_per_second != 0)
4657                           frame_delay/=mng_info->ticks_per_second;
4658
4659                         else
4660                           frame_delay=PNG_UINT_31_MAX;
4661
4662                         if (change_delay == 2)
4663                           default_frame_delay=frame_delay;
4664
4665                         p+=4;
4666
4667                         if (logging != MagickFalse)
4668                           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4669                             "    Framing_delay=%.20g",(double) frame_delay);
4670                       }
4671
4672                     if (change_timeout)
4673                       {
4674                         frame_timeout=1UL*image->ticks_per_second*
4675                           mng_get_long(p);
4676
4677                         if (mng_info->ticks_per_second != 0)
4678                           frame_timeout/=mng_info->ticks_per_second;
4679
4680                         else
4681                           frame_timeout=PNG_UINT_31_MAX;
4682
4683                         if (change_delay == 2)
4684                           default_frame_timeout=frame_timeout;
4685
4686                         p+=4;
4687
4688                         if (logging != MagickFalse)
4689                           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4690                             "    Framing_timeout=%.20g",(double) frame_timeout);
4691                       }
4692
4693                     if (change_clipping)
4694                       {
4695                         fb=mng_read_box(previous_fb,(char) p[0],&p[1]);
4696                         p+=17;
4697                         previous_fb=fb;
4698
4699                         if (logging != MagickFalse)
4700                           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4701                             "    Frame_clip: L=%.20g R=%.20g T=%.20g B=%.20g",
4702                             (double) fb.left,(double) fb.right,(double) fb.top,
4703                             (double) fb.bottom);
4704
4705                         if (change_clipping == 2)
4706                           default_fb=fb;
4707                       }
4708                   }
4709               }
4710             mng_info->clip=fb;
4711             mng_info->clip=mng_minimum_box(fb,mng_info->frame);
4712
4713             subframe_width=(size_t) (mng_info->clip.right
4714                -mng_info->clip.left);
4715
4716             subframe_height=(size_t) (mng_info->clip.bottom
4717                -mng_info->clip.top);
4718             /*
4719               Insert a background layer behind the frame if framing_mode is 4.
4720             */
4721 #if defined(MNG_INSERT_LAYERS)
4722             if (logging != MagickFalse)
4723               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4724                 "   subframe_width=%.20g, subframe_height=%.20g",(double)
4725                 subframe_width,(double) subframe_height);
4726
4727             if (insert_layers && (mng_info->framing_mode == 4) &&
4728                 (subframe_width) && (subframe_height))
4729               {
4730                 /* Allocate next image structure.  */
4731                 if (GetAuthenticPixelQueue(image) != (PixelPacket *) NULL)
4732                   {
4733                     AcquireNextImage(image_info,image);
4734
4735                     if (GetNextImageInList(image) == (Image *) NULL)
4736                       {
4737                         image=DestroyImageList(image);
4738                         MngInfoFreeStruct(mng_info,&have_mng_structure);
4739                         return((Image *) NULL);
4740                       }
4741
4742                     image=SyncNextImageInList(image);
4743                   }
4744
4745                 mng_info->image=image;
4746
4747                 if (term_chunk_found)
4748                   {
4749                     image->start_loop=MagickTrue;
4750                     image->iterations=mng_iterations;
4751                     term_chunk_found=MagickFalse;
4752                   }
4753
4754                 else
4755                     image->start_loop=MagickFalse;
4756
4757                 image->columns=subframe_width;
4758                 image->rows=subframe_height;
4759                 image->page.width=subframe_width;
4760                 image->page.height=subframe_height;
4761                 image->page.x=mng_info->clip.left;
4762                 image->page.y=mng_info->clip.top;
4763                 image->background_color=mng_background_color;
4764                 image->matte=MagickFalse;
4765                 image->delay=0;
4766                 (void) SetImageBackgroundColor(image);
4767
4768                 if (logging != MagickFalse)
4769                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4770                     "  Insert backgd layer, L=%.20g, R=%.20g T=%.20g, B=%.20g",
4771                     (double) mng_info->clip.left,(double) mng_info->clip.right,
4772                     (double) mng_info->clip.top,(double) mng_info->clip.bottom);
4773               }
4774 #endif
4775             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4776             continue;
4777           }
4778         if (memcmp(type,mng_CLIP,4) == 0)
4779           {
4780             unsigned int
4781               first_object,
4782               last_object;
4783
4784             /*
4785               Read CLIP.
4786             */
4787             first_object=(p[0] << 8) | p[1];
4788             last_object=(p[2] << 8) | p[3];
4789
4790             for (i=(int) first_object; i <= (int) last_object; i++)
4791             {
4792               if (mng_info->exists[i] && !mng_info->frozen[i])
4793                 {
4794                   MngBox
4795                     box;
4796
4797                   box=mng_info->object_clip[i];
4798                   mng_info->object_clip[i]=mng_read_box(box,(char) p[4],&p[5]);
4799                 }
4800             }
4801
4802             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4803             continue;
4804           }
4805         if (memcmp(type,mng_SAVE,4) == 0)
4806           {
4807             for (i=1; i < MNG_MAX_OBJECTS; i++)
4808               if (mng_info->exists[i])
4809                 {
4810                  mng_info->frozen[i]=MagickTrue;
4811 #ifdef MNG_OBJECT_BUFFERS
4812                  if (mng_info->ob[i] != (MngBuffer *) NULL)
4813                     mng_info->ob[i]->frozen=MagickTrue;
4814 #endif
4815                 }
4816
4817             if (length)
4818               chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4819
4820             continue;
4821           }
4822
4823         if ((memcmp(type,mng_DISC,4) == 0) || (memcmp(type,mng_SEEK,4) == 0))
4824           {
4825             /* Read DISC or SEEK.  */
4826
4827             if ((length == 0) || !memcmp(type,mng_SEEK,4))
4828               {
4829                 for (i=1; i < MNG_MAX_OBJECTS; i++)
4830                   MngInfoDiscardObject(mng_info,i);
4831               }
4832
4833             else
4834               {
4835                 register ssize_t
4836                   j;
4837
4838                 for (j=0; j < (ssize_t) length; j+=2)
4839                 {
4840                   i=p[j] << 8 | p[j+1];
4841                   MngInfoDiscardObject(mng_info,i);
4842                 }
4843               }
4844
4845             if (length)
4846               chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4847
4848             continue;
4849           }
4850
4851         if (memcmp(type,mng_MOVE,4) == 0)
4852           {
4853             size_t
4854               first_object,
4855               last_object;
4856
4857             /* read MOVE */
4858
4859             first_object=(p[0] << 8) | p[1];
4860             last_object=(p[2] << 8) | p[3];
4861             for (i=(ssize_t) first_object; i <= (ssize_t) last_object; i++)
4862             {
4863               if (mng_info->exists[i] && !mng_info->frozen[i])
4864                 {
4865                   MngPair
4866                     new_pair;
4867
4868                   MngPair
4869                     old_pair;
4870
4871                   old_pair.a=mng_info->x_off[i];
4872                   old_pair.b=mng_info->y_off[i];
4873                   new_pair=mng_read_pair(old_pair,(int) p[4],&p[5]);
4874                   mng_info->x_off[i]=new_pair.a;
4875                   mng_info->y_off[i]=new_pair.b;
4876                 }
4877             }
4878
4879             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4880             continue;
4881           }
4882
4883         if (memcmp(type,mng_LOOP,4) == 0)
4884           {
4885             ssize_t loop_iters=1;
4886             loop_level=chunk[0];
4887             mng_info->loop_active[loop_level]=1;  /* mark loop active */
4888
4889             /* Record starting point.  */
4890             loop_iters=mng_get_long(&chunk[1]);
4891
4892             if (logging != MagickFalse)
4893               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4894                 "  LOOP level %.20g has %.20g iterations ",(double) loop_level,
4895                 (double) loop_iters);
4896
4897             if (loop_iters == 0)
4898               skipping_loop=loop_level;
4899
4900             else
4901               {
4902                 mng_info->loop_jump[loop_level]=TellBlob(image);
4903                 mng_info->loop_count[loop_level]=loop_iters;
4904               }
4905
4906             mng_info->loop_iteration[loop_level]=0;
4907             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4908             continue;
4909           }
4910
4911         if (memcmp(type,mng_ENDL,4) == 0)
4912           {
4913             loop_level=chunk[0];
4914
4915             if (skipping_loop > 0)
4916               {
4917                 if (skipping_loop == loop_level)
4918                   {
4919                     /*
4920                       Found end of zero-iteration loop.
4921                     */
4922                     skipping_loop=(-1);
4923                     mng_info->loop_active[loop_level]=0;
4924                   }
4925               }
4926
4927             else
4928               {
4929                 if (mng_info->loop_active[loop_level] == 1)
4930                   {
4931                     mng_info->loop_count[loop_level]--;
4932                     mng_info->loop_iteration[loop_level]++;
4933
4934                     if (logging != MagickFalse)
4935                       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
4936                         "  ENDL: LOOP level %.20g has %.20g remaining iters ",
4937                         (double) loop_level,(double)
4938                         mng_info->loop_count[loop_level]);
4939
4940                     if (mng_info->loop_count[loop_level] != 0)
4941                       {
4942                         offset=SeekBlob(image,mng_info->loop_jump[loop_level],
4943                           SEEK_SET);
4944
4945                         if (offset < 0)
4946                           ThrowReaderException(CorruptImageError,
4947                             "ImproperImageHeader");
4948                       }
4949
4950                     else
4951                       {
4952                         short
4953                           last_level;
4954
4955                         /*
4956                           Finished loop.
4957                         */
4958                         mng_info->loop_active[loop_level]=0;
4959                         last_level=(-1);
4960                         for (i=0; i < loop_level; i++)
4961                           if (mng_info->loop_active[i] == 1)
4962                             last_level=(short) i;
4963                         loop_level=last_level;
4964                       }
4965                   }
4966               }
4967
4968             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
4969             continue;
4970           }
4971
4972         if (memcmp(type,mng_CLON,4) == 0)
4973           {
4974             if (mng_info->clon_warning == 0)
4975               (void) ThrowMagickException(&image->exception,GetMagickModule(),
4976                 CoderError,"CLON is not implemented yet","`%s'",
4977                 image->filename);
4978
4979             mng_info->clon_warning++;
4980           }
4981
4982         if (memcmp(type,mng_MAGN,4) == 0)
4983           {
4984             png_uint_16
4985               magn_first,
4986               magn_last,
4987               magn_mb,
4988               magn_ml,
4989               magn_mr,
4990               magn_mt,
4991               magn_mx,
4992               magn_my,
4993               magn_methx,
4994               magn_methy;
4995
4996             if (length > 1)
4997               magn_first=(p[0] << 8) | p[1];
4998
4999             else
5000               magn_first=0;
5001
5002             if (length > 3)
5003               magn_last=(p[2] << 8) | p[3];
5004
5005             else
5006               magn_last=magn_first;
5007 #ifndef MNG_OBJECT_BUFFERS
5008             if (magn_first || magn_last)
5009               if (mng_info->magn_warning == 0)
5010                 {
5011                   (void) ThrowMagickException(&image->exception,
5012                      GetMagickModule(),CoderError,
5013                      "MAGN is not implemented yet for nonzero objects",
5014                      "`%s'",image->filename);
5015
5016                    mng_info->magn_warning++;
5017                 }
5018 #endif
5019             if (length > 4)
5020               magn_methx=p[4];
5021
5022             else
5023               magn_methx=0;
5024
5025             if (length > 6)
5026               magn_mx=(p[5] << 8) | p[6];
5027
5028             else
5029               magn_mx=1;
5030
5031             if (magn_mx == 0)
5032               magn_mx=1;
5033
5034             if (length > 8)
5035               magn_my=(p[7] << 8) | p[8];
5036
5037             else
5038               magn_my=magn_mx;
5039
5040             if (magn_my == 0)
5041               magn_my=1;
5042
5043             if (length > 10)
5044               magn_ml=(p[9] << 8) | p[10];
5045
5046             else
5047               magn_ml=magn_mx;
5048
5049             if (magn_ml == 0)
5050               magn_ml=1;
5051
5052             if (length > 12)
5053               magn_mr=(p[11] << 8) | p[12];
5054
5055             else
5056               magn_mr=magn_mx;
5057
5058             if (magn_mr == 0)
5059               magn_mr=1;
5060
5061             if (length > 14)
5062               magn_mt=(p[13] << 8) | p[14];
5063
5064             else
5065               magn_mt=magn_my;
5066
5067             if (magn_mt == 0)
5068               magn_mt=1;
5069
5070             if (length > 16)
5071               magn_mb=(p[15] << 8) | p[16];
5072
5073             else
5074               magn_mb=magn_my;
5075
5076             if (magn_mb == 0)
5077               magn_mb=1;
5078
5079             if (length > 17)
5080               magn_methy=p[17];
5081
5082             else
5083               magn_methy=magn_methx;
5084
5085
5086             if (magn_methx > 5 || magn_methy > 5)
5087               if (mng_info->magn_warning == 0)
5088                 {
5089                   (void) ThrowMagickException(&image->exception,
5090                      GetMagickModule(),CoderError,
5091                      "Unknown MAGN method in MNG datastream","`%s'",
5092                      image->filename);
5093
5094                    mng_info->magn_warning++;
5095                 }
5096 #ifdef MNG_OBJECT_BUFFERS
5097           /* Magnify existing objects in the range magn_first to magn_last */
5098 #endif
5099             if (magn_first == 0 || magn_last == 0)
5100               {
5101                 /* Save the magnification factors for object 0 */
5102                 mng_info->magn_mb=magn_mb;
5103                 mng_info->magn_ml=magn_ml;
5104                 mng_info->magn_mr=magn_mr;
5105                 mng_info->magn_mt=magn_mt;
5106                 mng_info->magn_mx=magn_mx;
5107                 mng_info->magn_my=magn_my;
5108                 mng_info->magn_methx=magn_methx;
5109                 mng_info->magn_methy=magn_methy;
5110               }
5111           }
5112
5113         if (memcmp(type,mng_PAST,4) == 0)
5114           {
5115             if (mng_info->past_warning == 0)
5116               (void) ThrowMagickException(&image->exception,GetMagickModule(),
5117                 CoderError,"PAST is not implemented yet","`%s'",
5118                 image->filename);
5119
5120             mng_info->past_warning++;
5121           }
5122
5123         if (memcmp(type,mng_SHOW,4) == 0)
5124           {
5125             if (mng_info->show_warning == 0)
5126               (void) ThrowMagickException(&image->exception,GetMagickModule(),
5127                 CoderError,"SHOW is not implemented yet","`%s'",
5128                 image->filename);
5129
5130             mng_info->show_warning++;
5131           }
5132
5133         if (memcmp(type,mng_sBIT,4) == 0)
5134           {
5135             if (length < 4)
5136               mng_info->have_global_sbit=MagickFalse;
5137
5138             else
5139               {
5140                 mng_info->global_sbit.gray=p[0];
5141                 mng_info->global_sbit.red=p[0];
5142                 mng_info->global_sbit.green=p[1];
5143                 mng_info->global_sbit.blue=p[2];
5144                 mng_info->global_sbit.alpha=p[3];
5145                 mng_info->have_global_sbit=MagickTrue;
5146              }
5147           }
5148         if (memcmp(type,mng_pHYs,4) == 0)
5149           {
5150             if (length > 8)
5151               {
5152                 mng_info->global_x_pixels_per_unit=
5153                     (size_t) mng_get_long(p);
5154                 mng_info->global_y_pixels_per_unit=
5155                     (size_t) mng_get_long(&p[4]);
5156                 mng_info->global_phys_unit_type=p[8];
5157                 mng_info->have_global_phys=MagickTrue;
5158               }
5159
5160             else
5161               mng_info->have_global_phys=MagickFalse;
5162           }
5163         if (memcmp(type,mng_pHYg,4) == 0)
5164           {
5165             if (mng_info->phyg_warning == 0)
5166               (void) ThrowMagickException(&image->exception,GetMagickModule(),
5167                 CoderError,"pHYg is not implemented.","`%s'",image->filename);
5168
5169             mng_info->phyg_warning++;
5170           }
5171         if (memcmp(type,mng_BASI,4) == 0)
5172           {
5173             skip_to_iend=MagickTrue;
5174
5175             if (mng_info->basi_warning == 0)
5176               (void) ThrowMagickException(&image->exception,GetMagickModule(),
5177                 CoderError,"BASI is not implemented yet","`%s'",
5178                 image->filename);
5179
5180             mng_info->basi_warning++;
5181 #ifdef MNG_BASI_SUPPORTED
5182             basi_width=(size_t) ((p[0] << 24) | (p[1] << 16) |
5183                (p[2] << 8) | p[3]);
5184             basi_height=(size_t) ((p[4] << 24) | (p[5] << 16) |
5185                (p[6] << 8) | p[7]);
5186             basi_color_type=p[8];
5187             basi_compression_method=p[9];
5188             basi_filter_type=p[10];
5189             basi_interlace_method=p[11];
5190             if (length > 11)
5191               basi_red=(p[12] << 8) & p[13];
5192
5193             else
5194               basi_red=0;
5195
5196             if (length > 13)
5197               basi_green=(p[14] << 8) & p[15];
5198
5199             else
5200               basi_green=0;
5201
5202             if (length > 15)
5203               basi_blue=(p[16] << 8) & p[17];
5204
5205             else
5206               basi_blue=0;
5207
5208             if (length > 17)
5209               basi_alpha=(p[18] << 8) & p[19];
5210
5211             else
5212               {
5213                 if (basi_sample_depth == 16)
5214                   basi_alpha=65535L;
5215                 else
5216                   basi_alpha=255;
5217               }
5218
5219             if (length > 19)
5220               basi_viewable=p[20];
5221
5222             else
5223               basi_viewable=0;
5224
5225 #endif
5226             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
5227             continue;
5228           }
5229
5230         if (memcmp(type,mng_IHDR,4)
5231 #if defined(JNG_SUPPORTED)
5232             && memcmp(type,mng_JHDR,4)
5233 #endif
5234             )
5235           {
5236             /* Not an IHDR or JHDR chunk */
5237             if (length)
5238               chunk=(unsigned char *) RelinquishMagickMemory(chunk);
5239
5240             continue;
5241           }
5242 /* Process IHDR */
5243         if (logging != MagickFalse)
5244           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5245             "  Processing %c%c%c%c chunk",type[0],type[1],type[2],type[3]);
5246
5247         mng_info->exists[object_id]=MagickTrue;
5248         mng_info->viewable[object_id]=MagickTrue;
5249
5250         if (mng_info->invisible[object_id])
5251           {
5252             if (logging != MagickFalse)
5253               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5254                 "  Skipping invisible object");
5255
5256             skip_to_iend=MagickTrue;
5257             chunk=(unsigned char *) RelinquishMagickMemory(chunk);
5258             continue;
5259           }
5260 #if defined(MNG_INSERT_LAYERS)
5261         if (length < 8)
5262           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
5263
5264         image_width=(size_t) mng_get_long(p);
5265         image_height=(size_t) mng_get_long(&p[4]);
5266 #endif
5267         chunk=(unsigned char *) RelinquishMagickMemory(chunk);
5268
5269         /*
5270           Insert a transparent background layer behind the entire animation
5271           if it is not full screen.
5272         */
5273 #if defined(MNG_INSERT_LAYERS)
5274         if (insert_layers && mng_type && first_mng_object)
5275           {
5276             if ((mng_info->clip.left > 0) || (mng_info->clip.top > 0) ||
5277                 (image_width < mng_info->mng_width) ||
5278                 (mng_info->clip.right < (ssize_t) mng_info->mng_width) ||
5279                 (image_height < mng_info->mng_height) ||
5280                 (mng_info->clip.bottom < (ssize_t) mng_info->mng_height))
5281               {
5282                 if (GetAuthenticPixelQueue(image) != (PixelPacket *) NULL)
5283                   {
5284                     /*
5285                       Allocate next image structure.
5286                     */
5287                     AcquireNextImage(image_info,image);
5288
5289                     if (GetNextImageInList(image) == (Image *) NULL)
5290                       {
5291                         image=DestroyImageList(image);
5292                         MngInfoFreeStruct(mng_info,&have_mng_structure);
5293                         return((Image *) NULL);
5294                       }
5295
5296                     image=SyncNextImageInList(image);
5297                   }
5298                 mng_info->image=image;
5299
5300                 if (term_chunk_found)
5301                   {
5302                     image->start_loop=MagickTrue;
5303                     image->iterations=mng_iterations;
5304                     term_chunk_found=MagickFalse;
5305                   }
5306
5307                 else
5308                     image->start_loop=MagickFalse;
5309
5310                 /* Make a background rectangle.  */
5311
5312                 image->delay=0;
5313                 image->columns=mng_info->mng_width;
5314                 image->rows=mng_info->mng_height;
5315                 image->page.width=mng_info->mng_width;
5316                 image->page.height=mng_info->mng_height;
5317                 image->page.x=0;
5318                 image->page.y=0;
5319                 image->background_color=mng_background_color;
5320                 (void) SetImageBackgroundColor(image);
5321                 if (logging != MagickFalse)
5322                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5323                     "  Inserted transparent background layer, W=%.20g, H=%.20g",
5324                     (double) mng_info->mng_width,(double) mng_info->mng_height);
5325               }
5326           }
5327         /*
5328           Insert a background layer behind the upcoming image if
5329           framing_mode is 3, and we haven't already inserted one.
5330         */
5331         if (insert_layers && (mng_info->framing_mode == 3) &&
5332                 (subframe_width) && (subframe_height) && (simplicity == 0 ||
5333                 (simplicity & 0x08)))
5334           {
5335             if (GetAuthenticPixelQueue(image) != (PixelPacket *) NULL)
5336             {
5337               /*
5338                 Allocate next image structure.
5339               */
5340               AcquireNextImage(image_info,image);
5341
5342               if (GetNextImageInList(image) == (Image *) NULL)
5343                 {
5344                   image=DestroyImageList(image);
5345                   MngInfoFreeStruct(mng_info,&have_mng_structure);
5346                   return((Image *) NULL);
5347                 }
5348
5349               image=SyncNextImageInList(image);
5350             }
5351
5352             mng_info->image=image;
5353
5354             if (term_chunk_found)
5355               {
5356                 image->start_loop=MagickTrue;
5357                 image->iterations=mng_iterations;
5358                 term_chunk_found=MagickFalse;
5359               }
5360
5361             else
5362                 image->start_loop=MagickFalse;
5363
5364             image->delay=0;
5365             image->columns=subframe_width;
5366             image->rows=subframe_height;
5367             image->page.width=subframe_width;
5368             image->page.height=subframe_height;
5369             image->page.x=mng_info->clip.left;
5370             image->page.y=mng_info->clip.top;
5371             image->background_color=mng_background_color;
5372             image->matte=MagickFalse;
5373             (void) SetImageBackgroundColor(image);
5374
5375             if (logging != MagickFalse)
5376               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5377                 "  Insert background layer, L=%.20g, R=%.20g T=%.20g, B=%.20g",
5378                 (double) mng_info->clip.left,(double) mng_info->clip.right,
5379                 (double) mng_info->clip.top,(double) mng_info->clip.bottom);
5380           }
5381 #endif /* MNG_INSERT_LAYERS */
5382         first_mng_object=MagickFalse;
5383
5384         if (GetAuthenticPixelQueue(image) != (PixelPacket *) NULL)
5385           {
5386             /*
5387               Allocate next image structure.
5388             */
5389             AcquireNextImage(image_info,image);
5390
5391             if (GetNextImageInList(image) == (Image *) NULL)
5392               {
5393                 image=DestroyImageList(image);
5394                 MngInfoFreeStruct(mng_info,&have_mng_structure);
5395                 return((Image *) NULL);
5396               }
5397
5398             image=SyncNextImageInList(image);
5399           }
5400         mng_info->image=image;
5401         status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
5402           GetBlobSize(image));
5403
5404         if (status == MagickFalse)
5405           break;
5406
5407         if (term_chunk_found)
5408           {
5409             image->start_loop=MagickTrue;
5410             term_chunk_found=MagickFalse;
5411           }
5412
5413         else
5414             image->start_loop=MagickFalse;
5415
5416         if (mng_info->framing_mode == 1 || mng_info->framing_mode == 3)
5417           {
5418             image->delay=frame_delay;
5419             frame_delay=default_frame_delay;
5420           }
5421
5422         else
5423           image->delay=0;
5424
5425         image->page.width=mng_info->mng_width;
5426         image->page.height=mng_info->mng_height;
5427         image->page.x=mng_info->x_off[object_id];
5428         image->page.y=mng_info->y_off[object_id];
5429         image->iterations=mng_iterations;
5430
5431         /*
5432           Seek back to the beginning of the IHDR or JHDR chunk's length field.
5433         */
5434
5435         if (logging != MagickFalse)
5436           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5437             "  Seeking back to beginning of %c%c%c%c chunk",type[0],type[1],
5438             type[2],type[3]);
5439
5440         offset=SeekBlob(image,-((ssize_t) length+12),SEEK_CUR);
5441
5442         if (offset < 0)
5443           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
5444       }
5445
5446     previous=image;
5447     mng_info->image=image;
5448     mng_info->mng_type=mng_type;
5449     mng_info->object_id=object_id;
5450
5451     if (memcmp(type,mng_IHDR,4) == 0)
5452       image=ReadOnePNGImage(mng_info,image_info,exception);
5453
5454 #if defined(JNG_SUPPORTED)
5455     else
5456       image=ReadOneJNGImage(mng_info,image_info,exception);
5457 #endif
5458
5459     if (image == (Image *) NULL)
5460       {
5461         if (IsImageObject(previous) != MagickFalse)
5462           {
5463             (void) DestroyImageList(previous);
5464             (void) CloseBlob(previous);
5465           }
5466
5467         MngInfoFreeStruct(mng_info,&have_mng_structure);
5468         return((Image *) NULL);
5469       }
5470
5471     if (image->columns == 0 || image->rows == 0)
5472       {
5473         (void) CloseBlob(image);
5474         image=DestroyImageList(image);
5475         MngInfoFreeStruct(mng_info,&have_mng_structure);
5476         return((Image *) NULL);
5477       }
5478
5479     mng_info->image=image;
5480
5481     if (mng_type)
5482       {
5483         MngBox
5484           crop_box;
5485
5486         if (mng_info->magn_methx || mng_info->magn_methy)
5487           {
5488             png_uint_32
5489                magnified_height,
5490                magnified_width;
5491
5492             if (logging != MagickFalse)
5493               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5494                 "  Processing MNG MAGN chunk");
5495
5496             if (mng_info->magn_methx == 1)
5497               {
5498                 magnified_width=mng_info->magn_ml;
5499
5500                 if (image->columns > 1)
5501                    magnified_width += mng_info->magn_mr;
5502
5503                 if (image->columns > 2)
5504                    magnified_width += (png_uint_32)
5505                       ((image->columns-2)*(mng_info->magn_mx));
5506               }
5507
5508             else
5509               {
5510                 magnified_width=(png_uint_32) image->columns;
5511
5512                 if (image->columns > 1)
5513                    magnified_width += mng_info->magn_ml-1;
5514
5515                 if (image->columns > 2)
5516                    magnified_width += mng_info->magn_mr-1;
5517
5518                 if (image->columns > 3)
5519                    magnified_width += (png_uint_32)
5520                       ((image->columns-3)*(mng_info->magn_mx-1));
5521               }
5522
5523             if (mng_info->magn_methy == 1)
5524               {
5525                 magnified_height=mng_info->magn_mt;
5526
5527                 if (image->rows > 1)
5528                    magnified_height += mng_info->magn_mb;
5529
5530                 if (image->rows > 2)
5531                    magnified_height += (png_uint_32)
5532                       ((image->rows-2)*(mng_info->magn_my));
5533               }
5534
5535             else
5536               {
5537                 magnified_height=(png_uint_32) image->rows;
5538
5539                 if (image->rows > 1)
5540                    magnified_height += mng_info->magn_mt-1;
5541
5542                 if (image->rows > 2)
5543                    magnified_height += mng_info->magn_mb-1;
5544
5545                 if (image->rows > 3)
5546                    magnified_height += (png_uint_32)
5547                       ((image->rows-3)*(mng_info->magn_my-1));
5548               }
5549
5550             if (magnified_height > image->rows ||
5551                 magnified_width > image->columns)
5552               {
5553                 Image
5554                   *large_image;
5555
5556                 int
5557                   yy;
5558
5559                 ssize_t
5560                   m,
5561                   y;
5562
5563                 register ssize_t
5564                   x;
5565
5566                 register PixelPacket
5567                   *n,
5568                   *q;
5569
5570                 PixelPacket
5571                   *next,
5572                   *prev;
5573
5574                 png_uint_16
5575                   magn_methx,
5576                   magn_methy;
5577
5578                 /* Allocate next image structure.  */
5579
5580                 if (logging != MagickFalse)
5581                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5582                     "    Allocate magnified image");
5583
5584                 AcquireNextImage(image_info,image);
5585
5586                 if (GetNextImageInList(image) == (Image *) NULL)
5587                   {
5588                     image=DestroyImageList(image);
5589                     MngInfoFreeStruct(mng_info,&have_mng_structure);
5590                     return((Image *) NULL);
5591                   }
5592
5593                 large_image=SyncNextImageInList(image);
5594
5595                 large_image->columns=magnified_width;
5596                 large_image->rows=magnified_height;
5597
5598                 magn_methx=mng_info->magn_methx;
5599                 magn_methy=mng_info->magn_methy;
5600
5601 #if (MAGICKCORE_QUANTUM_DEPTH == 32)
5602 #define QM unsigned short
5603                 if (magn_methx != 1 || magn_methy != 1)
5604                   {
5605                   /*
5606                      Scale pixels to unsigned shorts to prevent
5607                      overflow of intermediate values of interpolations
5608                   */
5609                      for (y=0; y < (ssize_t) image->rows; y++)
5610                      {
5611                        q=GetAuthenticPixels(image,0,y,image->columns,1,
5612                           exception);
5613
5614                        for (x=(ssize_t) image->columns-1; x >= 0; x--)
5615                        {
5616                           q->red=ScaleQuantumToShort(q->red);
5617                           q->green=ScaleQuantumToShort(q->green);
5618                           q->blue=ScaleQuantumToShort(q->blue);
5619                           q->opacity=ScaleQuantumToShort(q->opacity);
5620                           q++;
5621                        }
5622
5623                        if (SyncAuthenticPixels(image,exception) == MagickFalse)
5624                          break;
5625                      }
5626                   }
5627 #else
5628 #define QM Quantum
5629 #endif
5630
5631                 if (image->matte != MagickFalse)
5632                    (void) SetImageBackgroundColor(large_image);
5633
5634                 else
5635                   {
5636                     large_image->background_color.opacity=OpaqueOpacity;
5637                     (void) SetImageBackgroundColor(large_image);
5638
5639                     if (magn_methx == 4)
5640                       magn_methx=2;
5641
5642                     if (magn_methx == 5)
5643                       magn_methx=3;
5644
5645                     if (magn_methy == 4)
5646                       magn_methy=2;
5647
5648                     if (magn_methy == 5)
5649                       magn_methy=3;
5650                   }
5651
5652                 /* magnify the rows into the right side of the large image */
5653
5654                 if (logging != MagickFalse)
5655                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5656                     "    Magnify the rows to %.20g",(double) large_image->rows);
5657                 m=(ssize_t) mng_info->magn_mt;
5658                 yy=0;
5659                 length=(size_t) image->columns;
5660                 next=(PixelPacket *) AcquireQuantumMemory(length,sizeof(*next));
5661                 prev=(PixelPacket *) AcquireQuantumMemory(length,sizeof(*prev));
5662
5663                 if ((prev == (PixelPacket *) NULL) ||
5664                     (next == (PixelPacket *) NULL))
5665                   {
5666                      image=DestroyImageList(image);
5667                      MngInfoFreeStruct(mng_info,&have_mng_structure);
5668                      ThrowReaderException(ResourceLimitError,
5669                        "MemoryAllocationFailed");
5670                   }
5671
5672                 n=GetAuthenticPixels(image,0,0,image->columns,1,exception);
5673                 (void) CopyMagickMemory(next,n,length);
5674
5675                 for (y=0; y < (ssize_t) image->rows; y++)
5676                 {
5677                   if (y == 0)
5678                     m=(ssize_t) mng_info->magn_mt;
5679
5680                   else if (magn_methy > 1 && y == (ssize_t) image->rows-2)
5681                     m=(ssize_t) mng_info->magn_mb;
5682
5683                   else if (magn_methy <= 1 && y == (ssize_t) image->rows-1)
5684                     m=(ssize_t) mng_info->magn_mb;
5685
5686                   else if (magn_methy > 1 && y == (ssize_t) image->rows-1)
5687                     m=1;
5688
5689                   else
5690                     m=(ssize_t) mng_info->magn_my;
5691
5692                   n=prev;
5693                   prev=next;
5694                   next=n;
5695
5696                   if (y < (ssize_t) image->rows-1)
5697                     {
5698                       n=GetAuthenticPixels(image,0,y+1,image->columns,1,
5699                           exception);
5700                       (void) CopyMagickMemory(next,n,length);
5701                     }
5702
5703                   for (i=0; i < m; i++, yy++)
5704                   {
5705                     register PixelPacket
5706                       *pixels;
5707
5708                     assert(yy < (ssize_t) large_image->rows);
5709                     pixels=prev;
5710                     n=next;
5711                     q=GetAuthenticPixels(large_image,0,yy,large_image->columns,
5712                           1,exception);
5713                     q+=(large_image->columns-image->columns);
5714
5715                     for (x=(ssize_t) image->columns-1; x >= 0; x--)
5716                     {
5717                       /* TO DO: get color as function of indexes[x] */
5718                       /*
5719                       if (image->storage_class == PseudoClass)
5720                         {
5721                         }
5722                       */
5723
5724                       if (magn_methy <= 1)
5725                         {
5726                           *q=(*pixels); /* replicate previous */
5727                         }
5728
5729                       else if (magn_methy == 2 || magn_methy == 4)
5730                         {
5731                           if (i == 0)
5732                              *q=(*pixels);
5733
5734                           else
5735                             {
5736                               /* Interpolate */
5737                               (*q).red=(QM) (((ssize_t) (2*i*((*n).red
5738                                  -(*pixels).red)+m))/((ssize_t) (m*2))
5739                                  +(*pixels).red);
5740                               (*q).green=(QM) (((ssize_t) (2*i*((*n).green
5741                                  -(*pixels).green)+m))/((ssize_t) (m*2))
5742                                  +(*pixels).green);
5743                               (*q).blue=(QM) (((ssize_t) (2*i*((*n).blue
5744                                  -(*pixels).blue)+m))/((ssize_t) (m*2))
5745                                  +(*pixels).blue);
5746
5747                               if (image->matte != MagickFalse)
5748                                  (*q).opacity=(QM) (((ssize_t)
5749                                  (2*i*((*n).opacity
5750                                  -(*pixels).opacity)+m))
5751                                  /((ssize_t) (m*2))+(*pixels).opacity);
5752                             }
5753
5754                           if (magn_methy == 4)
5755                             {
5756                               /* Replicate nearest */
5757                               if (i <= ((m+1) << 1))
5758                                  (*q).opacity=(*pixels).opacity+0;
5759                               else
5760                                  (*q).opacity=(*n).opacity+0;
5761                             }
5762                         }
5763
5764                       else /* if (magn_methy == 3 || magn_methy == 5) */
5765                         {
5766                           /* Replicate nearest */
5767                           if (i <= ((m+1) << 1))
5768                              *q=(*pixels);
5769
5770                           else
5771                              *q=(*n);
5772
5773                           if (magn_methy == 5)
5774                             {
5775                               (*q).opacity=(QM) (((ssize_t) (2*i*((*n).opacity
5776                                  -(*pixels).opacity)+m))/((ssize_t) (m*2))
5777                                  +(*pixels).opacity);
5778                             }
5779                         }
5780                       n++;
5781                       q++;
5782                       pixels++;
5783                     } /* x */
5784
5785                     if (SyncAuthenticPixels(large_image,exception) == 0)
5786                       break;
5787
5788                   } /* i */
5789                 } /* y */
5790
5791                 prev=(PixelPacket *) RelinquishMagickMemory(prev);
5792                 next=(PixelPacket *) RelinquishMagickMemory(next);
5793
5794                 length=image->columns;
5795
5796                 if (logging != MagickFalse)
5797                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5798                     "    Delete original image");
5799
5800                 DeleteImageFromList(&image);
5801
5802                 image=large_image;
5803
5804                 mng_info->image=image;
5805
5806                 /* magnify the columns */
5807                 if (logging != MagickFalse)
5808                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5809                     "    Magnify the columns to %.20g",(double) image->columns);
5810
5811                 for (y=0; y < (ssize_t) image->rows; y++)
5812                 {
5813                   register PixelPacket
5814                     *pixels;
5815
5816                   q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
5817                   pixels=q+(image->columns-length);
5818                   n=pixels+1;
5819
5820                   for (x=(ssize_t) (image->columns-length);
5821                     x < (ssize_t) image->columns; x++)
5822                   {
5823                     if (x == (ssize_t) (image->columns-length))
5824                       m=(ssize_t) mng_info->magn_ml;
5825
5826                     else if (magn_methx > 1 && x == (ssize_t) image->columns-2)
5827                       m=(ssize_t) mng_info->magn_mr;
5828
5829                     else if (magn_methx <= 1 && x == (ssize_t) image->columns-1)
5830                       m=(ssize_t) mng_info->magn_mr;
5831
5832                     else if (magn_methx > 1 && x == (ssize_t) image->columns-1)
5833                       m=1;
5834
5835                     else
5836                       m=(ssize_t) mng_info->magn_mx;
5837
5838                     for (i=0; i < m; i++)
5839                     {
5840                       if (magn_methx <= 1)
5841                         {
5842                           /* replicate previous */
5843                           *q=(*pixels);
5844                         }
5845
5846                       else if (magn_methx == 2 || magn_methx == 4)
5847                         {
5848                           if (i == 0)
5849                             *q=(*pixels);
5850
5851                           else
5852                             {
5853                               /* Interpolate */
5854                               (*q).red=(QM) ((2*i*((*n).red
5855                                  -(*pixels).red)+m)
5856                                  /((ssize_t) (m*2))+(*pixels).red);
5857                               (*q).green=(QM) ((2*i*((*n).green
5858                                  -(*pixels).green)
5859                                  +m)/((ssize_t) (m*2))+(*pixels).green);
5860                               (*q).blue=(QM) ((2*i*((*n).blue
5861                                  -(*pixels).blue)+m)
5862                                  /((ssize_t) (m*2))+(*pixels).blue);
5863                               if (image->matte != MagickFalse)
5864                                  (*q).opacity=(QM) ((2*i*((*n).opacity
5865                                    -(*pixels).opacity)+m)/((ssize_t) (m*2))
5866                                    +(*pixels).opacity);
5867                             }
5868
5869                           if (magn_methx == 4)
5870                             {
5871                               /* Replicate nearest */
5872                               if (i <= ((m+1) << 1))
5873                                  (*q).opacity=(*pixels).opacity+0;
5874                               else
5875                                  (*q).opacity=(*n).opacity+0;
5876                             }
5877                         }
5878
5879                       else /* if (magn_methx == 3 || magn_methx == 5) */
5880                         {
5881                           /* Replicate nearest */
5882                           if (i <= ((m+1) << 1))
5883                              *q=(*pixels);
5884
5885                           else
5886                              *q=(*n);
5887
5888                           if (magn_methx == 5)
5889                             {
5890                               /* Interpolate */
5891                               (*q).opacity=(QM) ((2*i*((*n).opacity
5892                                  -(*pixels).opacity)+m) /((ssize_t) (m*2))
5893                                  +(*pixels).opacity);
5894                             }
5895                         }
5896                       q++;
5897                     }
5898                     n++;
5899                     p++;
5900                   }
5901
5902                   if (SyncAuthenticPixels(image,exception) == MagickFalse)
5903                     break;
5904                 }
5905 #if (MAGICKCORE_QUANTUM_DEPTH == 32)
5906               if (magn_methx != 1 || magn_methy != 1)
5907                 {
5908                 /*
5909                    Rescale pixels to Quantum
5910                 */
5911                    for (y=0; y < (ssize_t) image->rows; y++)
5912                    {
5913                      q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
5914
5915                      for (x=(ssize_t) image->columns-1; x >= 0; x--)
5916                      {
5917                         q->red=ScaleShortToQuantum(q->red);
5918                         q->green=ScaleShortToQuantum(q->green);
5919                         q->blue=ScaleShortToQuantum(q->blue);
5920                         q->opacity=ScaleShortToQuantum(q->opacity);
5921                         q++;
5922                      }
5923
5924                      if (SyncAuthenticPixels(image,exception) == MagickFalse)
5925                        break;
5926                    }
5927                 }
5928 #endif
5929                 if (logging != MagickFalse)
5930                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5931                     "  Finished MAGN processing");
5932               }
5933           }
5934
5935         /*
5936           Crop_box is with respect to the upper left corner of the MNG.
5937         */
5938         crop_box.left=mng_info->image_box.left+mng_info->x_off[object_id];
5939         crop_box.right=mng_info->image_box.right+mng_info->x_off[object_id];
5940         crop_box.top=mng_info->image_box.top+mng_info->y_off[object_id];
5941         crop_box.bottom=mng_info->image_box.bottom+mng_info->y_off[object_id];
5942         crop_box=mng_minimum_box(crop_box,mng_info->clip);
5943         crop_box=mng_minimum_box(crop_box,mng_info->frame);
5944         crop_box=mng_minimum_box(crop_box,mng_info->object_clip[object_id]);
5945         if ((crop_box.left != (mng_info->image_box.left
5946             +mng_info->x_off[object_id])) ||
5947             (crop_box.right != (mng_info->image_box.right
5948             +mng_info->x_off[object_id])) ||
5949             (crop_box.top != (mng_info->image_box.top
5950             +mng_info->y_off[object_id])) ||
5951             (crop_box.bottom != (mng_info->image_box.bottom
5952             +mng_info->y_off[object_id])))
5953           {
5954             if (logging != MagickFalse)
5955               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
5956                 "  Crop the PNG image");
5957
5958             if ((crop_box.left < crop_box.right) &&
5959                 (crop_box.top < crop_box.bottom))
5960               {
5961                 Image
5962                   *im;
5963
5964                 RectangleInfo
5965                   crop_info;
5966
5967                 /*
5968                   Crop_info is with respect to the upper left corner of
5969                   the image.
5970                 */
5971                 crop_info.x=(crop_box.left-mng_info->x_off[object_id]);
5972                 crop_info.y=(crop_box.top-mng_info->y_off[object_id]);
5973                 crop_info.width=(size_t) (crop_box.right-crop_box.left);
5974                 crop_info.height=(size_t) (crop_box.bottom-crop_box.top);
5975                 image->page.width=image->columns;
5976                 image->page.height=image->rows;
5977                 image->page.x=0;
5978                 image->page.y=0;
5979                 im=CropImage(image,&crop_info,exception);
5980
5981                 if (im != (Image *) NULL)
5982                   {
5983                     image->columns=im->columns;
5984                     image->rows=im->rows;
5985                     im=DestroyImage(im);
5986                     image->page.width=image->columns;
5987                     image->page.height=image->rows;
5988                     image->page.x=crop_box.left;
5989                     image->page.y=crop_box.top;
5990                   }
5991               }
5992
5993             else
5994               {
5995                 /*
5996                   No pixels in crop area.  The MNG spec still requires
5997                   a layer, though, so make a single transparent pixel in
5998                   the top left corner.
5999                 */
6000                 image->columns=1;
6001                 image->rows=1;
6002                 image->colors=2;
6003                 (void) SetImageBackgroundColor(image);
6004                 image->page.width=1;
6005                 image->page.height=1;
6006                 image->page.x=0;
6007                 image->page.y=0;
6008               }
6009           }
6010 #ifndef PNG_READ_EMPTY_PLTE_SUPPORTED
6011         image=mng_info->image;
6012 #endif
6013       }
6014
6015 #if (MAGICKCORE_QUANTUM_DEPTH > 16)
6016       /* PNG does not handle depths greater than 16 so reduce it even
6017        * if lossy
6018        */
6019       if (image->depth > 16)
6020          image->depth=16;
6021 #endif
6022
6023 #if (MAGICKCORE_QUANTUM_DEPTH >= 16)
6024       if (LosslessReduceDepthOK(image) != MagickFalse)
6025          image->depth = 8;
6026 #endif
6027
6028       GetImageException(image,exception);
6029
6030       if (image_info->number_scenes != 0)
6031         {
6032           if (mng_info->scenes_found >
6033              (ssize_t) (image_info->first_scene+image_info->number_scenes))
6034             break;
6035         }
6036
6037       if (logging != MagickFalse)
6038         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6039           "  Finished reading image datastream.");
6040
6041   } while (LocaleCompare(image_info->magick,"MNG") == 0);
6042
6043   (void) CloseBlob(image);
6044
6045   if (logging != MagickFalse)
6046     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6047       "  Finished reading all image datastreams.");
6048
6049 #if defined(MNG_INSERT_LAYERS)
6050   if (insert_layers && !mng_info->image_found && (mng_info->mng_width) &&
6051        (mng_info->mng_height))
6052     {
6053       /*
6054         Insert a background layer if nothing else was found.
6055       */
6056       if (logging != MagickFalse)
6057         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6058           "  No images found.  Inserting a background layer.");
6059
6060       if (GetAuthenticPixelQueue(image) != (PixelPacket *) NULL)
6061         {
6062           /*
6063             Allocate next image structure.
6064           */
6065           AcquireNextImage(image_info,image);
6066           if (GetNextImageInList(image) == (Image *) NULL)
6067             {
6068               image=DestroyImageList(image);
6069               MngInfoFreeStruct(mng_info,&have_mng_structure);
6070
6071               if (logging != MagickFalse)
6072                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6073                   "  Allocation failed, returning NULL.");
6074
6075               return((Image *) NULL);
6076             }
6077           image=SyncNextImageInList(image);
6078         }
6079       image->columns=mng_info->mng_width;
6080       image->rows=mng_info->mng_height;
6081       image->page.width=mng_info->mng_width;
6082       image->page.height=mng_info->mng_height;
6083       image->page.x=0;
6084       image->page.y=0;
6085       image->background_color=mng_background_color;
6086       image->matte=MagickFalse;
6087
6088       if (image_info->ping == MagickFalse)
6089         (void) SetImageBackgroundColor(image);
6090
6091       mng_info->image_found++;
6092     }
6093 #endif
6094   image->iterations=mng_iterations;
6095
6096   if (mng_iterations == 1)
6097     image->start_loop=MagickTrue;
6098
6099   while (GetPreviousImageInList(image) != (Image *) NULL)
6100   {
6101     image_count++;
6102     if (image_count > 10*mng_info->image_found)
6103       {
6104         if (logging != MagickFalse)
6105           (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  No beginning");
6106
6107         (void) ThrowMagickException(&image->exception,GetMagickModule(),
6108           CoderError,"Linked list is corrupted, beginning of list not found",
6109           "`%s'",image_info->filename);
6110
6111         return((Image *) NULL);
6112       }
6113
6114     image=GetPreviousImageInList(image);
6115
6116     if (GetNextImageInList(image) == (Image *) NULL)
6117       {
6118         if (logging != MagickFalse)
6119           (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  Corrupt list");
6120
6121         (void) ThrowMagickException(&image->exception,GetMagickModule(),
6122           CoderError,"Linked list is corrupted; next_image is NULL","`%s'",
6123           image_info->filename);
6124       }
6125   }
6126
6127   if (mng_info->ticks_per_second && mng_info->image_found > 1 &&
6128              GetNextImageInList(image) ==
6129      (Image *) NULL)
6130     {
6131       if (logging != MagickFalse)
6132         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6133             "  First image null");
6134
6135       (void) ThrowMagickException(&image->exception,GetMagickModule(),
6136         CoderError,"image->next for first image is NULL but shouldn't be.",
6137         "`%s'",image_info->filename);
6138     }
6139
6140   if (mng_info->image_found == 0)
6141     {
6142       if (logging != MagickFalse)
6143         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6144           "  No visible images found.");
6145
6146       (void) ThrowMagickException(&image->exception,GetMagickModule(),
6147         CoderError,"No visible images in file","`%s'",image_info->filename);
6148
6149       if (image != (Image *) NULL)
6150         image=DestroyImageList(image);
6151
6152       MngInfoFreeStruct(mng_info,&have_mng_structure);
6153       return((Image *) NULL);
6154     }
6155
6156   if (mng_info->ticks_per_second)
6157     final_delay=1UL*MagickMax(image->ticks_per_second,1L)*
6158             final_delay/mng_info->ticks_per_second;
6159
6160   else
6161     image->start_loop=MagickTrue;
6162
6163   /* Find final nonzero image delay */
6164   final_image_delay=0;
6165
6166   while (GetNextImageInList(image) != (Image *) NULL)
6167     {
6168       if (image->delay)
6169         final_image_delay=image->delay;
6170
6171       image=GetNextImageInList(image);
6172     }
6173
6174   if (final_delay < final_image_delay)
6175     final_delay=final_image_delay;
6176
6177   image->delay=final_delay;
6178
6179   if (logging != MagickFalse)
6180       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6181         "  image->delay=%.20g, final_delay=%.20g",(double) image->delay,
6182         (double) final_delay);
6183
6184   if (logging != MagickFalse)
6185     {
6186       int
6187         scene;
6188
6189       scene=0;
6190       image=GetFirstImageInList(image);
6191
6192       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6193         "  Before coalesce:");
6194
6195       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6196         "    scene 0 delay=%.20g",(double) image->delay);
6197
6198       while (GetNextImageInList(image) != (Image *) NULL)
6199       {
6200         image=GetNextImageInList(image);
6201         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6202           "    scene %.20g delay=%.20g",(double) scene++,(double) image->delay);
6203       }
6204     }
6205
6206   image=GetFirstImageInList(image);
6207 #ifdef MNG_COALESCE_LAYERS
6208   if (insert_layers)
6209     {
6210       Image
6211         *next_image,
6212         *next;
6213
6214       size_t
6215         scene;
6216
6217       if (logging != MagickFalse)
6218         (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  Coalesce Images");
6219
6220       scene=image->scene;
6221       next_image=CoalesceImages(image,&image->exception);
6222
6223       if (next_image == (Image *) NULL)
6224         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
6225
6226       image=DestroyImageList(image);
6227       image=next_image;
6228
6229       for (next=image; next != (Image *) NULL; next=next_image)
6230       {
6231          next->page.width=mng_info->mng_width;
6232          next->page.height=mng_info->mng_height;
6233          next->page.x=0;
6234          next->page.y=0;
6235          next->scene=scene++;
6236          next_image=GetNextImageInList(next);
6237
6238          if (next_image == (Image *) NULL)
6239            break;
6240
6241          if (next->delay == 0)
6242            {
6243              scene--;
6244              next_image->previous=GetPreviousImageInList(next);
6245              if (GetPreviousImageInList(next) == (Image *) NULL)
6246                image=next_image;
6247              else
6248                next->previous->next=next_image;
6249              next=DestroyImage(next);
6250            }
6251       }
6252     }
6253 #endif
6254
6255   while (GetNextImageInList(image) != (Image *) NULL)
6256       image=GetNextImageInList(image);
6257
6258   image->dispose=BackgroundDispose;
6259
6260   if (logging != MagickFalse)
6261     {
6262       int
6263         scene;
6264
6265       scene=0;
6266       image=GetFirstImageInList(image);
6267
6268       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6269         "  After coalesce:");
6270
6271       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6272         "    scene 0 delay=%.20g dispose=%.20g",(double) image->delay,
6273         (double) image->dispose);
6274
6275       while (GetNextImageInList(image) != (Image *) NULL)
6276       {
6277         image=GetNextImageInList(image);
6278
6279         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6280           "    scene %.20g delay=%.20g dispose=%.20g",(double) scene++,
6281           (double) image->delay,(double) image->dispose);
6282       }
6283    }
6284
6285   image=GetFirstImageInList(image);
6286   MngInfoFreeStruct(mng_info,&have_mng_structure);
6287   have_mng_structure=MagickFalse;
6288
6289   if (logging != MagickFalse)
6290     (void) LogMagickEvent(CoderEvent,GetMagickModule(),"exit ReadMNGImage()");
6291
6292   return(GetFirstImageInList(image));
6293 }
6294 #else /* PNG_LIBPNG_VER > 10011 */
6295 static Image *ReadPNGImage(const ImageInfo *image_info,ExceptionInfo *exception)
6296 {
6297   printf("Your PNG library is too old: You have libpng-%s\n",
6298      PNG_LIBPNG_VER_STRING);
6299
6300   (void) ThrowMagickException(exception,GetMagickModule(),CoderError,
6301     "PNG library is too old","`%s'",image_info->filename);
6302
6303   return(Image *) NULL;
6304 }
6305
6306 static Image *ReadMNGImage(const ImageInfo *image_info,ExceptionInfo *exception)
6307 {
6308   return(ReadPNGImage(image_info,exception));
6309 }
6310 #endif /* PNG_LIBPNG_VER > 10011 */
6311 #endif
6312 \f
6313 /*
6314 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6315 %                                                                             %
6316 %                                                                             %
6317 %                                                                             %
6318 %   R e g i s t e r P N G I m a g e                                           %
6319 %                                                                             %
6320 %                                                                             %
6321 %                                                                             %
6322 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6323 %
6324 %  RegisterPNGImage() adds properties for the PNG image format to
6325 %  the list of supported formats.  The properties include the image format
6326 %  tag, a method to read and/or write the format, whether the format
6327 %  supports the saving of more than one frame to the same file or blob,
6328 %  whether the format supports native in-memory I/O, and a brief
6329 %  description of the format.
6330 %
6331 %  The format of the RegisterPNGImage method is:
6332 %
6333 %      size_t RegisterPNGImage(void)
6334 %
6335 */
6336 ModuleExport size_t RegisterPNGImage(void)
6337 {
6338   char
6339     version[MaxTextExtent];
6340
6341   MagickInfo
6342     *entry;
6343
6344   static const char
6345     *PNGNote=
6346     {
6347       "See http://www.libpng.org/ for details about the PNG format."
6348     },
6349
6350     *JNGNote=
6351     {
6352       "See http://www.libpng.org/pub/mng/ for details about the JNG\n"
6353       "format."
6354     },
6355
6356     *MNGNote=
6357     {
6358       "See http://www.libpng.org/pub/mng/ for details about the MNG\n"
6359       "format."
6360     };
6361
6362   *version='\0';
6363
6364 #if defined(PNG_LIBPNG_VER_STRING)
6365   (void) ConcatenateMagickString(version,"libpng ",MaxTextExtent);
6366   (void) ConcatenateMagickString(version,PNG_LIBPNG_VER_STRING,MaxTextExtent);
6367
6368   if (LocaleCompare(PNG_LIBPNG_VER_STRING,png_get_header_ver(NULL)) != 0)
6369     {
6370       (void) ConcatenateMagickString(version,",",MaxTextExtent);
6371       (void) ConcatenateMagickString(version,png_get_libpng_ver(NULL),
6372             MaxTextExtent);
6373     }
6374 #endif
6375
6376   entry=SetMagickInfo("MNG");
6377   entry->seekable_stream=MagickTrue;  /* To do: eliminate this. */
6378
6379 #if defined(MAGICKCORE_PNG_DELEGATE)
6380   entry->decoder=(DecodeImageHandler *) ReadMNGImage;
6381   entry->encoder=(EncodeImageHandler *) WriteMNGImage;
6382 #endif
6383
6384   entry->magick=(IsImageFormatHandler *) IsMNG;
6385   entry->description=ConstantString("Multiple-image Network Graphics");
6386
6387   if (*version != '\0')
6388     entry->version=ConstantString(version);
6389
6390   entry->module=ConstantString("PNG");
6391   entry->note=ConstantString(MNGNote);
6392   (void) RegisterMagickInfo(entry);
6393
6394   entry=SetMagickInfo("PNG");
6395
6396 #if defined(MAGICKCORE_PNG_DELEGATE)
6397   entry->decoder=(DecodeImageHandler *) ReadPNGImage;
6398   entry->encoder=(EncodeImageHandler *) WritePNGImage;
6399 #endif
6400
6401   entry->magick=(IsImageFormatHandler *) IsPNG;
6402   entry->adjoin=MagickFalse;
6403   entry->description=ConstantString("Portable Network Graphics");
6404   entry->module=ConstantString("PNG");
6405
6406   if (*version != '\0')
6407     entry->version=ConstantString(version);
6408
6409   entry->note=ConstantString(PNGNote);
6410   (void) RegisterMagickInfo(entry);
6411
6412   entry=SetMagickInfo("PNG8");
6413
6414 #if defined(MAGICKCORE_PNG_DELEGATE)
6415   entry->decoder=(DecodeImageHandler *) ReadPNGImage;
6416   entry->encoder=(EncodeImageHandler *) WritePNGImage;
6417 #endif
6418
6419   entry->magick=(IsImageFormatHandler *) IsPNG;
6420   entry->adjoin=MagickFalse;
6421   entry->description=ConstantString(
6422             "8-bit indexed with optional binary transparency");
6423   entry->module=ConstantString("PNG");
6424   (void) RegisterMagickInfo(entry);
6425
6426   entry=SetMagickInfo("PNG24");
6427   *version='\0';
6428
6429 #if defined(ZLIB_VERSION)
6430   (void) ConcatenateMagickString(version,"zlib ",MaxTextExtent);
6431   (void) ConcatenateMagickString(version,ZLIB_VERSION,MaxTextExtent);
6432
6433   if (LocaleCompare(ZLIB_VERSION,zlib_version) != 0)
6434     {
6435       (void) ConcatenateMagickString(version,",",MaxTextExtent);
6436       (void) ConcatenateMagickString(version,zlib_version,MaxTextExtent);
6437     }
6438 #endif
6439
6440   if (*version != '\0')
6441     entry->version=ConstantString(version);
6442
6443 #if defined(MAGICKCORE_PNG_DELEGATE)
6444   entry->decoder=(DecodeImageHandler *) ReadPNGImage;
6445   entry->encoder=(EncodeImageHandler *) WritePNGImage;
6446 #endif
6447
6448   entry->magick=(IsImageFormatHandler *) IsPNG;
6449   entry->adjoin=MagickFalse;
6450   entry->description=ConstantString("opaque 24-bit RGB");
6451   entry->module=ConstantString("PNG");
6452   (void) RegisterMagickInfo(entry);
6453
6454   entry=SetMagickInfo("PNG32");
6455
6456 #if defined(MAGICKCORE_PNG_DELEGATE)
6457   entry->decoder=(DecodeImageHandler *) ReadPNGImage;
6458   entry->encoder=(EncodeImageHandler *) WritePNGImage;
6459 #endif
6460
6461   entry->magick=(IsImageFormatHandler *) IsPNG;
6462   entry->adjoin=MagickFalse;
6463   entry->description=ConstantString("opaque or transparent 32-bit RGBA");
6464   entry->module=ConstantString("PNG");
6465   (void) RegisterMagickInfo(entry);
6466
6467   entry=SetMagickInfo("JNG");
6468
6469 #if defined(JNG_SUPPORTED)
6470 #if defined(MAGICKCORE_PNG_DELEGATE)
6471   entry->decoder=(DecodeImageHandler *) ReadJNGImage;
6472   entry->encoder=(EncodeImageHandler *) WriteJNGImage;
6473 #endif
6474 #endif
6475
6476   entry->magick=(IsImageFormatHandler *) IsJNG;
6477   entry->adjoin=MagickFalse;
6478   entry->description=ConstantString("JPEG Network Graphics");
6479   entry->module=ConstantString("PNG");
6480   entry->note=ConstantString(JNGNote);
6481   (void) RegisterMagickInfo(entry);
6482
6483 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
6484   ping_semaphore=AllocateSemaphoreInfo();
6485 #endif
6486
6487   return(MagickImageCoderSignature);
6488 }
6489 \f
6490 /*
6491 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6492 %                                                                             %
6493 %                                                                             %
6494 %                                                                             %
6495 %   U n r e g i s t e r P N G I m a g e                                       %
6496 %                                                                             %
6497 %                                                                             %
6498 %                                                                             %
6499 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6500 %
6501 %  UnregisterPNGImage() removes format registrations made by the
6502 %  PNG module from the list of supported formats.
6503 %
6504 %  The format of the UnregisterPNGImage method is:
6505 %
6506 %      UnregisterPNGImage(void)
6507 %
6508 */
6509 ModuleExport void UnregisterPNGImage(void)
6510 {
6511   (void) UnregisterMagickInfo("MNG");
6512   (void) UnregisterMagickInfo("PNG");
6513   (void) UnregisterMagickInfo("PNG8");
6514   (void) UnregisterMagickInfo("PNG24");
6515   (void) UnregisterMagickInfo("PNG32");
6516   (void) UnregisterMagickInfo("JNG");
6517
6518 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
6519   if (ping_semaphore != (SemaphoreInfo *) NULL)
6520     DestroySemaphoreInfo(&ping_semaphore);
6521 #endif
6522 }
6523 \f
6524 #if defined(MAGICKCORE_PNG_DELEGATE)
6525 #if PNG_LIBPNG_VER > 10011
6526 /*
6527 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6528 %                                                                             %
6529 %                                                                             %
6530 %                                                                             %
6531 %   W r i t e M N G I m a g e                                                 %
6532 %                                                                             %
6533 %                                                                             %
6534 %                                                                             %
6535 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6536 %
6537 %  WriteMNGImage() writes an image in the Portable Network Graphics
6538 %  Group's "Multiple-image Network Graphics" encoded image format.
6539 %
6540 %  MNG support written by Glenn Randers-Pehrson, glennrp@image...
6541 %
6542 %  The format of the WriteMNGImage method is:
6543 %
6544 %      MagickBooleanType WriteMNGImage(const ImageInfo *image_info,Image *image)
6545 %
6546 %  A description of each parameter follows.
6547 %
6548 %    o image_info: the image info.
6549 %
6550 %    o image:  The image.
6551 %
6552 %
6553 %  To do (as of version 5.5.2, November 26, 2002 -- glennrp -- see also
6554 %    "To do" under ReadPNGImage):
6555 %
6556 %    Preserve all unknown and not-yet-handled known chunks found in input
6557 %    PNG file and copy them  into output PNG files according to the PNG
6558 %    copying rules.
6559 %
6560 %    Write the iCCP chunk at MNG level when (icc profile length > 0)
6561 %
6562 %    Improve selection of color type (use indexed-colour or indexed-colour
6563 %    with tRNS when 256 or fewer unique RGBA values are present).
6564 %
6565 %    Figure out what to do with "dispose=<restore-to-previous>" (dispose == 3)
6566 %    This will be complicated if we limit ourselves to generating MNG-LC
6567 %    files.  For now we ignore disposal method 3 and simply overlay the next
6568 %    image on it.
6569 %
6570 %    Check for identical PLTE's or PLTE/tRNS combinations and use a
6571 %    global MNG PLTE or PLTE/tRNS combination when appropriate.
6572 %    [mostly done 15 June 1999 but still need to take care of tRNS]
6573 %
6574 %    Check for identical sRGB and replace with a global sRGB (and remove
6575 %    gAMA/cHRM if sRGB is found; check for identical gAMA/cHRM and
6576 %    replace with global gAMA/cHRM (or with sRGB if appropriate; replace
6577 %    local gAMA/cHRM with local sRGB if appropriate).
6578 %
6579 %    Check for identical sBIT chunks and write global ones.
6580 %
6581 %    Provide option to skip writing the signature tEXt chunks.
6582 %
6583 %    Use signatures to detect identical objects and reuse the first
6584 %    instance of such objects instead of writing duplicate objects.
6585 %
6586 %    Use a smaller-than-32k value of compression window size when
6587 %    appropriate.
6588 %
6589 %    Encode JNG datastreams.  Mostly done as of 5.5.2; need to write
6590 %    ancillary text chunks and save profiles.
6591 %
6592 %    Provide an option to force LC files (to ensure exact framing rate)
6593 %    instead of VLC.
6594 %
6595 %    Provide an option to force VLC files instead of LC, even when offsets
6596 %    are present.  This will involve expanding the embedded images with a
6597 %    transparent region at the top and/or left.
6598 */
6599
6600 static void
6601 Magick_png_write_raw_profile(const ImageInfo *image_info,png_struct *ping,
6602    png_info *ping_info, unsigned char *profile_type, unsigned char
6603    *profile_description, unsigned char *profile_data, png_uint_32 length)
6604 {
6605    png_textp
6606      text;
6607
6608    register ssize_t
6609      i;
6610
6611    unsigned char
6612      *sp;
6613
6614    png_charp
6615      dp;
6616
6617    png_uint_32
6618      allocated_length,
6619      description_length;
6620
6621    unsigned char
6622      hex[16]={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
6623
6624    if (LocaleNCompare((char *) profile_type+1, "ng-chunk-",9) == 0)
6625       return;
6626
6627    if (image_info->verbose)
6628      {
6629        (void) printf("writing raw profile: type=%s, length=%.20g\n",
6630          (char *) profile_type, (double) length);
6631      }
6632
6633    text=(png_textp) png_malloc(ping,(png_uint_32) sizeof(png_text));
6634    description_length=(png_uint_32) strlen((const char *) profile_description);
6635    allocated_length=(png_uint_32) (length*2 + (length >> 5) + 20
6636       + description_length);
6637    text[0].text=(png_charp) png_malloc(ping,allocated_length);
6638    text[0].key=(png_charp) png_malloc(ping, (png_uint_32) 80);
6639    text[0].key[0]='\0';
6640    (void) ConcatenateMagickString(text[0].key,
6641       "Raw profile type ",MaxTextExtent);
6642    (void) ConcatenateMagickString(text[0].key,(const char *) profile_type,62);
6643    sp=profile_data;
6644    dp=text[0].text;
6645    *dp++='\n';
6646    (void) CopyMagickString(dp,(const char *) profile_description,
6647      allocated_length);
6648    dp+=description_length;
6649    *dp++='\n';
6650    (void) FormatMagickString(dp,allocated_length-
6651      (png_size_t) (dp-text[0].text),"%8lu ",(unsigned long) length);
6652    dp+=8;
6653
6654    for (i=0; i < (ssize_t) length; i++)
6655    {
6656      if (i%36 == 0)
6657        *dp++='\n';
6658      *(dp++)=(char) hex[((*sp >> 4) & 0x0f)];
6659      *(dp++)=(char) hex[((*sp++ ) & 0x0f)];
6660    }
6661
6662    *dp++='\n';
6663    *dp='\0';
6664    text[0].text_length=(png_size_t) (dp-text[0].text);
6665    text[0].compression=image_info->compression == NoCompression ||
6666      (image_info->compression == UndefinedCompression &&
6667      text[0].text_length < 128) ? -1 : 0;
6668
6669    if (text[0].text_length <= allocated_length)
6670      png_set_text(ping,ping_info,text,1);
6671
6672    png_free(ping,text[0].text);
6673    png_free(ping,text[0].key);
6674    png_free(ping,text);
6675 }
6676
6677 static MagickBooleanType Magick_png_write_chunk_from_profile(Image *image,
6678   const char *string, MagickBooleanType logging)
6679 {
6680   char
6681     *name;
6682
6683   const StringInfo
6684     *profile;
6685
6686   unsigned char
6687     *data;
6688
6689   png_uint_32 length;
6690
6691   ResetImageProfileIterator(image);
6692
6693   for (name=GetNextImageProfile(image); name != (const char *) NULL; )
6694   {
6695     profile=GetImageProfile(image,name);
6696
6697     if (profile != (const StringInfo *) NULL)
6698       {
6699         StringInfo
6700           *ping_profile;
6701
6702         if (LocaleNCompare(name,string,11) == 0)
6703           {
6704             if (logging != MagickFalse)
6705                (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6706                    "  Found %s profile",name);
6707
6708             ping_profile=CloneStringInfo(profile);
6709             data=GetStringInfoDatum(ping_profile),
6710             length=(png_uint_32) GetStringInfoLength(ping_profile);
6711             data[4]=data[3];
6712             data[3]=data[2];
6713             data[2]=data[1];
6714             data[1]=data[0];
6715             (void) WriteBlobMSBULong(image,length-5);  /* data length */
6716             (void) WriteBlob(image,length-1,data+1);
6717             (void) WriteBlobMSBULong(image,crc32(0,data+1,(uInt) length-1));
6718             ping_profile=DestroyStringInfo(ping_profile);
6719           }
6720       }
6721
6722       name=GetNextImageProfile(image);
6723    }
6724
6725    return(MagickTrue);
6726 }
6727
6728
6729 /* Write one PNG image */
6730 static MagickBooleanType WriteOnePNGImage(MngInfo *mng_info,
6731    const ImageInfo *IMimage_info,Image *IMimage)
6732 {
6733   Image
6734     *image;
6735
6736   ImageInfo
6737     *image_info;
6738
6739   char
6740     s[2];
6741
6742   const char
6743     *name,
6744     *property,
6745     *value;
6746
6747   const StringInfo
6748     *profile;
6749
6750   int
6751     num_passes,
6752     pass;
6753
6754   png_byte
6755      ping_trans_alpha[256];
6756
6757   png_color
6758      palette[257];
6759
6760   png_color_16
6761     ping_background,
6762     ping_trans_color;
6763
6764   png_info
6765     *ping_info;
6766
6767   png_struct
6768     *ping;
6769
6770   png_uint_32
6771     ping_height,
6772     ping_width;
6773
6774   ssize_t
6775     y;
6776
6777   MagickBooleanType
6778     image_matte,
6779     logging,
6780     matte,
6781
6782     ping_have_color,
6783     ping_have_non_bw,
6784     ping_have_PLTE,
6785     ping_have_bKGD,
6786     ping_have_pHYs,
6787     ping_have_tRNS,
6788
6789     ping_exclude_bKGD,
6790     ping_exclude_cHRM,
6791     /* ping_exclude_EXIF, */
6792     ping_exclude_gAMA,
6793     ping_exclude_iCCP,
6794     /* ping_exclude_iTXt, */
6795     ping_exclude_oFFs,
6796     ping_exclude_pHYs,
6797     ping_exclude_sRGB,
6798     ping_exclude_tEXt,
6799     /* ping_exclude_tRNS, */
6800     ping_exclude_vpAg,
6801     ping_exclude_zCCP, /* hex-encoded iCCP */
6802     ping_exclude_zTXt,
6803
6804     ping_need_colortype_warning,
6805
6806     status;
6807
6808   QuantumInfo
6809     *quantum_info;
6810
6811   register ssize_t
6812     i,
6813     x;
6814
6815   unsigned char
6816     *ping_pixels;
6817
6818   volatile int
6819     image_colors,
6820     ping_bit_depth,
6821     ping_color_type,
6822     ping_interlace_method,
6823     ping_compression_method,
6824     ping_filter_method,
6825     ping_num_trans;
6826
6827   volatile size_t
6828     image_depth,
6829     old_bit_depth;
6830
6831   size_t
6832     quality,
6833     rowbytes,
6834     save_image_depth;
6835
6836   int
6837     number_colors,
6838     number_opaque,
6839     number_semitransparent,
6840     number_transparent,
6841     ping_pHYs_unit_type;
6842
6843   png_uint_32
6844     ping_pHYs_x_resolution,
6845     ping_pHYs_y_resolution;
6846
6847   logging=LogMagickEvent(CoderEvent,GetMagickModule(),
6848     "  enter WriteOnePNGImage()");
6849
6850   image = CloneImage(IMimage,0,0,MagickFalse,&IMimage->exception);
6851   image_info=(ImageInfo *) CloneImageInfo(IMimage_info);
6852
6853   if (mng_info->need_blob != MagickFalse)
6854   {
6855     if (OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception) ==
6856        MagickFalse)
6857     {
6858       image_info=DestroyImageInfo(image_info);
6859       image=DestroyImage(image);
6860       return(MagickFalse);
6861     }
6862   }
6863
6864 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
6865   LockSemaphoreInfo(ping_semaphore);
6866 #endif
6867
6868   /* Initialize some stuff */
6869   ping_bit_depth=0,
6870   ping_color_type=0,
6871   ping_interlace_method=0,
6872   ping_compression_method=0,
6873   ping_filter_method=0,
6874   ping_num_trans = 0;
6875
6876   ping_background.red = 0;
6877   ping_background.green = 0;
6878   ping_background.blue = 0;
6879   ping_background.gray = 0;
6880   ping_background.index = 0;
6881
6882   ping_trans_color.red=0;
6883   ping_trans_color.green=0;
6884   ping_trans_color.blue=0;
6885   ping_trans_color.gray=0;
6886
6887   ping_pHYs_unit_type = 0;
6888   ping_pHYs_x_resolution = 0;
6889   ping_pHYs_y_resolution = 0;
6890
6891   ping_have_color=MagickTrue;
6892   ping_have_non_bw=MagickTrue;
6893   ping_have_PLTE=MagickFalse;
6894   ping_have_bKGD=MagickFalse;
6895   ping_have_pHYs=MagickFalse;
6896   ping_have_tRNS=MagickFalse;
6897
6898   ping_exclude_bKGD=mng_info->ping_exclude_bKGD;
6899   ping_exclude_cHRM=mng_info->ping_exclude_cHRM;
6900   /* ping_exclude_EXIF=mng_info->ping_exclude_EXIF; */
6901   ping_exclude_gAMA=mng_info->ping_exclude_gAMA;
6902   ping_exclude_cHRM=mng_info->ping_exclude_cHRM;
6903   ping_exclude_iCCP=mng_info->ping_exclude_iCCP;
6904   /* ping_exclude_iTXt=mng_info->ping_exclude_iTXt; */
6905   ping_exclude_oFFs=mng_info->ping_exclude_oFFs;
6906   ping_exclude_pHYs=mng_info->ping_exclude_pHYs;
6907   ping_exclude_sRGB=mng_info->ping_exclude_sRGB;
6908   ping_exclude_tEXt=mng_info->ping_exclude_tEXt;
6909   /* ping_exclude_tRNS=mng_info->ping_exclude_tRNS; */
6910   ping_exclude_vpAg=mng_info->ping_exclude_vpAg;
6911   ping_exclude_zCCP=mng_info->ping_exclude_zCCP; /* hex-encoded iCCP in zTXt */
6912   ping_exclude_zTXt=mng_info->ping_exclude_zTXt;
6913
6914   ping_need_colortype_warning = MagickFalse;
6915
6916   number_opaque = 0;
6917   number_semitransparent = 0;
6918   number_transparent = 0;
6919
6920   if (image->colorspace != RGBColorspace)
6921     (void) TransformImageColorspace(image,RGBColorspace);
6922
6923   /*
6924     Sometimes we get PseudoClass images whose RGB values don't match
6925     the colors in the colormap.  This code syncs the RGB values.
6926   */
6927   if (image->depth <= 8 && image->taint && image->storage_class == PseudoClass)
6928      (void) SyncImage(image);
6929
6930 #if (MAGICKCORE_QUANTUM_DEPTH == 8)
6931   if (image->depth > 8)
6932     {
6933       if (logging != MagickFalse)
6934         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6935           "    Reducing PNG bit depth to 8 since this is a Q8 build.");
6936
6937       image->depth=8;
6938     }
6939 #endif
6940
6941
6942 #if (MAGICKCORE_QUANTUM_DEPTH > 16)
6943   /* PNG does not handle depths greater than 16 so reduce it even
6944    * if lossy
6945    */
6946   if (image->depth > 16)
6947       image->depth=16;
6948 #endif
6949
6950 #if (MAGICKCORE_QUANTUM_DEPTH >= 16)
6951   if (image->depth == 16 && mng_info->write_png_colortype != 16)
6952     if (mng_info->write_png8 || LosslessReduceDepthOK(image) != MagickFalse)
6953       image->depth = 8;
6954 #endif
6955
6956 #ifdef BUILD_PNG_PALETTE
6957   if (mng_info->write_png_colortype < 8 /* all */)
6958     {
6959       /*
6960        * Sometimes we get DirectClass images that have 256 colors or fewer.
6961        * This code will build a colormap.
6962        *
6963        * Also, sometimes we get PseudoClass images with an out-of-date
6964        * colormap.  This code will replace the colormap with a new one.
6965        * Sometimes we get PseudoClass images that have more than 256 colors.
6966        * This code will delete the colormap and change the image to
6967        * DirectClass.
6968        *
6969        * If image->matte is MagickFalse, we ignore the opacity channel
6970        * even though it sometimes contains left-over non-opaque values.
6971        *
6972        * Also we gather some information (number of opaque, transparent,
6973        * and semitransparent pixels, and whether the image has any non-gray
6974        * pixels) that we might need later. If the user wants to force
6975        * GrayAlpha or RGBA (colortype 4 or 6) we probably don't need any
6976        * of that.
6977        */
6978
6979      ExceptionInfo
6980        *exception;
6981
6982      int
6983        n;
6984
6985      PixelPacket
6986        opaque[260],
6987        semitransparent[260],
6988        transparent[260];
6989
6990      register IndexPacket
6991        *indexes;
6992
6993      register const PixelPacket
6994        *s,
6995        *q;
6996
6997      if (logging != MagickFalse)
6998        (void) LogMagickEvent(CoderEvent,GetMagickModule(),
6999            "    Enter BUILD_PALETTE:");
7000
7001      if (logging != MagickFalse)
7002        {
7003          (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7004                "      image->columns=%.20g",(double) image->columns);
7005          (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7006                "      image->rows=%.20g",(double) image->rows);
7007          (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7008                "      image->matte=%.20g",(double) image->matte);
7009          (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7010                "      image->depth=%.20g",(double) image->depth);
7011
7012          if (image->colormap != NULL)
7013          {
7014            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7015                "      Original colormap:");
7016            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7017                "        i    (red,green,blue,opacity)");
7018
7019            for (i=0; i < 256; i++)
7020            {
7021                  (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7022                      "        %d    (%d,%d,%d,%d)",
7023                       (int) i,
7024                       (int) image->colormap[i].red,
7025                       (int) image->colormap[i].green,
7026                       (int) image->colormap[i].blue,
7027                       (int) image->colormap[i].opacity);
7028            }
7029
7030            for (i=image->colors - 10; i < (ssize_t) image->colors; i++)
7031            {
7032              if (i > 255)
7033                {
7034                  (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7035                      "        %d    (%d,%d,%d,%d)",
7036                       (int) i,
7037                       (int) image->colormap[i].red,
7038                       (int) image->colormap[i].green,
7039                       (int) image->colormap[i].blue,
7040                       (int) image->colormap[i].opacity);
7041                }
7042            }
7043          }
7044
7045          (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7046              "      image->colors=%d",(int) image->colors);
7047
7048          if (image->colors == 0)
7049          (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7050              "        (zero means unknown)");
7051
7052          (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7053               "      Regenerate the colormap");
7054        }
7055
7056        exception=(&image->exception);
7057
7058        ping_have_color=MagickFalse;
7059        ping_have_non_bw=MagickFalse;
7060        image_colors=0;
7061
7062        for (y=0; y < (ssize_t) image->rows; y++)
7063        {
7064          q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
7065
7066          if (q == (PixelPacket *) NULL)
7067            break;
7068
7069          /* Worst case is black-and-white; we are looking at every
7070           * pixel twice.
7071           *
7072           * TO DO: Do the following 2 loops over the colormap, if
7073           * possible, after it has been generated, instead of over
7074           * the pixels.  Only resort to looping over the pixels
7075           * when more than 256 colors (or gray levels) are present.
7076           */
7077
7078          if (ping_have_color == MagickFalse)
7079            {
7080              s=q;
7081              for (x=0; x < (ssize_t) image->columns; x++)
7082              {
7083                if (s->red != s->green || s->red != s->blue)
7084                  {
7085                     ping_have_color=MagickTrue;
7086                     ping_have_non_bw=MagickTrue;
7087                     break;
7088                  }
7089                s++;
7090              }
7091            }
7092
7093          if (ping_have_non_bw == MagickFalse)
7094            {
7095              s=q;
7096              for (x=0; x < (ssize_t) image->columns; x++)
7097              {
7098                if (s->red != 0 && s->red != QuantumRange)
7099                  {
7100                    ping_have_non_bw=MagickTrue;
7101                    break;
7102                  }
7103                s++;
7104              }
7105            }
7106
7107          for (x=0; x < (ssize_t) image->columns; x++)
7108             {
7109                 if (image->matte == MagickFalse || q->opacity == OpaqueOpacity)
7110                   {
7111                     if (number_opaque < 259)
7112                       {
7113                         if (number_opaque == 0)
7114                           {
7115                             opaque[0]=*q;
7116                             opaque[0].opacity=OpaqueOpacity;
7117                             number_opaque=1;
7118                           }
7119
7120                         for (i=0; i< (ssize_t) number_opaque; i++)
7121                           {
7122                             if (IsColorEqual(opaque+i, (PixelPacket *) q))
7123                               break;
7124                           }
7125
7126                         if (i ==  (ssize_t) number_opaque &&
7127                             number_opaque < 259)
7128                           {
7129                             number_opaque++;
7130                             opaque[i] = *q;
7131                             opaque[i].opacity = OpaqueOpacity;
7132                           }
7133                       }
7134                   }
7135                 else if (q->opacity == TransparentOpacity)
7136                   {
7137                     if (number_transparent < 259)
7138                       {
7139                         if (number_transparent == 0)
7140                           {
7141                             transparent[0]=*q;
7142                             ping_trans_color.red=(unsigned short)(q->red);
7143                             ping_trans_color.green=(unsigned short) (q->green);
7144                             ping_trans_color.blue=(unsigned short) (q->blue);
7145                             ping_trans_color.gray=(unsigned short) (q->blue);
7146                             number_transparent = 1;
7147                           }
7148
7149                         for (i=0; i< (ssize_t) number_transparent; i++)
7150                           {
7151                             if (IsColorEqual(transparent+i, (PixelPacket *) q))
7152                               break;
7153                           }
7154
7155                         if (i ==  (ssize_t) number_transparent &&
7156                             number_transparent < 259)
7157                           {
7158                             number_transparent++;
7159                             transparent[i] = *q;
7160                           }
7161                       }
7162                   }
7163                 else
7164                   {
7165                     if (number_semitransparent < 259)
7166                       {
7167                         if (number_semitransparent == 0)
7168                           {
7169                             semitransparent[0]=*q;
7170                             number_semitransparent = 1;
7171                           }
7172
7173                         for (i=0; i< (ssize_t) number_semitransparent; i++)
7174                           {
7175                             if (IsColorEqual(semitransparent+i,
7176                                (PixelPacket *) q) &&
7177                                q->opacity == semitransparent[i].opacity)
7178                               break;
7179                           }
7180
7181                         if (i ==  (ssize_t) number_semitransparent &&
7182                             number_semitransparent < 259)
7183                           {
7184                             number_semitransparent++;
7185                             semitransparent[i] = *q;
7186                           }
7187                       }
7188                   }
7189                 q++;
7190              }
7191           }
7192
7193           image_colors=number_opaque+number_transparent+number_semitransparent;
7194
7195           if (logging != MagickFalse)
7196             {
7197               if (image_colors > 256)
7198                  (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7199                        "      image has more than 256 colors");
7200
7201               else
7202                  (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7203                        "      image has %d colors",image_colors);
7204             }
7205
7206           if (image_colors < 257)
7207             {
7208               PixelPacket
7209                 colormap[260];
7210
7211             /*
7212               Initialize image colormap.
7213             */
7214
7215             if (logging != MagickFalse)
7216                (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7217                      "      Sort the new colormap");
7218
7219             /* Sort palette, transparent first */;
7220
7221             n = 0;
7222
7223             for (i=0; i<number_transparent; i++)
7224                colormap[n++] = transparent[i];
7225
7226             for (i=0; i<number_semitransparent; i++)
7227                colormap[n++] = semitransparent[i];
7228
7229             for (i=0; i<number_opaque; i++)
7230                colormap[n++] = opaque[i];
7231
7232             if (ping_exclude_bKGD == MagickFalse)
7233               {
7234                 /* Add the background color to the palette, if it
7235                  * isn't already there.
7236                  */
7237                 for (i=0; i<number_opaque; i++)
7238                 {
7239                    if (IsColorEqual(opaque+i,
7240                       &image->background_color))
7241                    break;
7242                 }
7243
7244                 if (number_opaque < 257 && i == number_opaque)
7245                 {
7246                    opaque[i]=image->background_color;
7247                    opaque[i].opacity = OpaqueOpacity;
7248                    number_opaque++;
7249                 }
7250               }
7251
7252             if ((mng_info->ping_exclude_tRNS == MagickFalse ||
7253                 (number_transparent == 0 && number_semitransparent == 0)) &&
7254                 (((mng_info->write_png_colortype-1) ==
7255                 PNG_COLOR_TYPE_PALETTE) ||
7256                 (mng_info->write_png_colortype == 0)))
7257               {
7258                  if (logging != MagickFalse)
7259                    {
7260                      if (n !=  (ssize_t) image_colors)
7261                         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7262                         "   image_colors (%d) and n (%d)  don't match",
7263                         image_colors, n);
7264
7265                      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7266                         "      AcquireImageColormap");
7267                     }
7268
7269               image->colors = image_colors;
7270
7271               if (AcquireImageColormap(image,image_colors) ==
7272                   MagickFalse)
7273                  ThrowWriterException(ResourceLimitError,
7274                     "MemoryAllocationFailed");
7275
7276               for (i=0; i< (ssize_t) image_colors; i++)
7277                  image->colormap[i] = colormap[i];
7278
7279               if (logging != MagickFalse)
7280                 {
7281                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7282                         "      image->colors=%d (%d)",
7283                         (int) image->colors, image_colors);
7284
7285                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7286                         "      Update the pixel indexes");
7287                 }
7288
7289               for (y=0; y < (ssize_t) image->rows; y++)
7290               {
7291                 q=GetAuthenticPixels(image,0,y,image->columns,1,
7292                     exception);
7293
7294                 if (q == (PixelPacket *) NULL)
7295                   break;
7296
7297                 indexes=GetAuthenticIndexQueue(image);
7298
7299                 for (x=0; x < (ssize_t) image->columns; x++)
7300                 {
7301                   for (i=0; i< (ssize_t) image_colors; i++)
7302                   {
7303                     if ((image->matte == MagickFalse ||
7304                         image->colormap[i].opacity == q->opacity) &&
7305                         (IsColorEqual(&image->colormap[i],(PixelPacket *) q)))
7306                     {
7307                       indexes[x]=(IndexPacket) i;
7308                       break;
7309                     }
7310                   }
7311                   q++;
7312                 }
7313
7314                 if (SyncAuthenticPixels(image,exception) == MagickFalse)
7315                    break;
7316              }
7317            }
7318          }
7319
7320        if (logging != MagickFalse)
7321          {
7322            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7323               "      image->colors=%d", (int) image->colors);
7324
7325            if (image->colormap != NULL)
7326              {
7327                (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7328                    "       i     (red,green,blue,opacity)");
7329
7330                for (i=0; i < (ssize_t) image->colors; i++)
7331                {
7332                  if (i < 300 || i >= image->colors - 10)
7333                    {
7334                      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7335                          "       %d     (%d,%d,%d,%d)",
7336                           (int) i,
7337                           (int) image->colormap[i].red,
7338                           (int) image->colormap[i].green,
7339                           (int) image->colormap[i].blue,
7340                           (int) image->colormap[i].opacity);
7341                    }
7342                }
7343              }
7344
7345             if (logging != MagickFalse)
7346               {
7347                 if (number_transparent < 257)
7348                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7349                         "      number_transparent     = %d",
7350                         number_transparent);
7351                 else
7352
7353                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7354                         "      number_transparent     > 256");
7355
7356                 if (number_opaque < 257)
7357                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7358                         "      number_opaque          = %d",
7359                         number_opaque);
7360                 else
7361                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7362                         "      number_opaque          > 256");
7363
7364                 if (number_semitransparent < 257)
7365                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7366                         "      number_semitransparent = %d",
7367                         number_semitransparent);
7368                 else
7369
7370                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7371                         "      number_semitransparent > 256");
7372               }
7373
7374            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7375                "    Exit BUILD_PALETTE:");
7376          }
7377     }
7378 #endif /* BUILD_PNG_PALETTE */
7379
7380   /* Force sub-8-bit grayscale images, except for black-and-white images,
7381    * to be written as indexed-color PNG
7382    */
7383   if ((number_transparent == 0 && number_semitransparent == 0) &&
7384       mng_info->write_png_colortype == 0 &&
7385       ((number_opaque <= 2 && ping_have_non_bw != MagickFalse) ||
7386       (number_opaque > 2 && number_opaque < 17)))
7387     ping_have_color = MagickTrue;
7388
7389   if (mng_info->ping_exclude_tRNS != MagickFalse &&
7390      (number_transparent != 0 || number_semitransparent != 0))
7391     {
7392       int colortype=mng_info->write_png_colortype;
7393
7394       if (ping_have_color == MagickFalse)
7395         mng_info->write_png_colortype = 5;
7396
7397       else
7398         mng_info->write_png_colortype = 7;
7399
7400       if (colortype != 0 &&
7401          mng_info->write_png_colortype != (ssize_t) colortype)
7402         ping_need_colortype_warning=MagickTrue;
7403
7404     }
7405
7406   image_depth=image->depth;
7407
7408   quantum_info = (QuantumInfo *) NULL;
7409   number_colors=0;
7410   image_colors=(int) image->colors;
7411   image_matte=image->matte;
7412
7413   mng_info->IsPalette=image->storage_class == PseudoClass &&
7414     image_colors <= 256;
7415
7416   /*
7417     Allocate the PNG structures
7418   */
7419 #ifdef PNG_USER_MEM_SUPPORTED
7420   ping=png_create_write_struct_2(PNG_LIBPNG_VER_STRING,image,
7421     MagickPNGErrorHandler,MagickPNGWarningHandler,(void *) NULL,
7422     (png_malloc_ptr) Magick_png_malloc,(png_free_ptr) Magick_png_free);
7423
7424 #else
7425   ping=png_create_write_struct(PNG_LIBPNG_VER_STRING,image,
7426     MagickPNGErrorHandler,MagickPNGWarningHandler);
7427
7428 #endif
7429   if (ping == (png_struct *) NULL)
7430     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
7431
7432   ping_info=png_create_info_struct(ping);
7433
7434   if (ping_info == (png_info *) NULL)
7435     {
7436       png_destroy_write_struct(&ping,(png_info **) NULL);
7437       ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
7438     }
7439
7440   png_set_write_fn(ping,image,png_put_data,png_flush_data);
7441   ping_pixels=(unsigned char *) NULL;
7442
7443   if (setjmp(png_jmpbuf(ping)))
7444     {
7445       /*
7446         PNG write failed.
7447       */
7448 #ifdef PNG_DEBUG
7449      if (image_info->verbose)
7450         (void) printf("PNG write has failed.\n");
7451 #endif
7452       png_destroy_write_struct(&ping,&ping_info);
7453 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
7454       UnlockSemaphoreInfo(ping_semaphore);
7455 #endif
7456       if (mng_info->need_blob != MagickFalse)
7457           (void) CloseBlob(image);
7458       image_info=DestroyImageInfo(image_info);
7459       image=DestroyImage(image);
7460       return(MagickFalse);
7461     }
7462   /*
7463     Prepare PNG for writing.
7464   */
7465 #if defined(PNG_MNG_FEATURES_SUPPORTED)
7466   if (mng_info->write_mng)
7467      (void) png_permit_mng_features(ping,PNG_ALL_MNG_FEATURES);
7468
7469 #else
7470 # ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED
7471   if (mng_info->write_mng)
7472      png_permit_empty_plte(ping,MagickTrue);
7473
7474 # endif
7475 #endif
7476
7477   x=0;
7478
7479   ping_width=(png_uint_32) image->columns;
7480   ping_height=(png_uint_32) image->rows;
7481
7482   if (mng_info->write_png8 || mng_info->write_png24 || mng_info->write_png32)
7483      image_depth=8;
7484
7485   if (mng_info->write_png_depth != 0)
7486      image_depth=mng_info->write_png_depth;
7487
7488   /* Adjust requested depth to next higher valid depth if necessary */
7489   if (image_depth > 8)
7490      image_depth=16;
7491
7492   if ((image_depth > 4) && (image_depth < 8))
7493      image_depth=8;
7494
7495   if (image_depth == 3)
7496      image_depth=4;
7497
7498   if (logging != MagickFalse)
7499     {
7500      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7501         "    width=%.20g",(double) ping_width);
7502      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7503         "    height=%.20g",(double) ping_height);
7504      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7505         "    image_matte=%.20g",(double) image->matte);
7506      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7507         "    image->depth=%.20g",(double) image->depth);
7508      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7509         "    Tentative ping_bit_depth=%.20g",(double) image_depth);
7510     }
7511
7512   save_image_depth=image_depth;
7513   ping_bit_depth=(png_byte) save_image_depth;
7514
7515
7516 #if defined(PNG_pHYs_SUPPORTED)
7517   if (ping_exclude_pHYs == MagickFalse)
7518   {
7519   if ((image->x_resolution != 0) && (image->y_resolution != 0) &&
7520       (!mng_info->write_mng || !mng_info->equal_physs))
7521     {
7522       if (logging != MagickFalse)
7523         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7524             "    Setting up pHYs chunk");
7525
7526       if (image->units == PixelsPerInchResolution)
7527         {
7528           ping_pHYs_unit_type=PNG_RESOLUTION_METER;
7529           ping_pHYs_x_resolution=(png_uint_32) (100.0*image->x_resolution/2.54);
7530           ping_pHYs_y_resolution=(png_uint_32) (100.0*image->y_resolution/2.54);
7531         }
7532
7533       else if (image->units == PixelsPerCentimeterResolution)
7534         {
7535           ping_pHYs_unit_type=PNG_RESOLUTION_METER;
7536           ping_pHYs_x_resolution=(png_uint_32) (100.0*image->x_resolution);
7537           ping_pHYs_y_resolution=(png_uint_32) (100.0*image->y_resolution);
7538         }
7539
7540       else
7541         {
7542           ping_pHYs_unit_type=PNG_RESOLUTION_UNKNOWN;
7543           ping_pHYs_x_resolution=(png_uint_32) image->x_resolution;
7544           ping_pHYs_y_resolution=(png_uint_32) image->y_resolution;
7545         }
7546
7547        ping_have_pHYs = MagickTrue;
7548     }
7549   }
7550 #endif
7551
7552   if (ping_exclude_bKGD == MagickFalse)
7553   {
7554   if ((!mng_info->adjoin || !mng_info->equal_backgrounds))
7555     {
7556        unsigned int
7557          mask;
7558
7559        mask=0xffff;
7560        if (ping_bit_depth == 8)
7561           mask=0x00ff;
7562
7563        if (ping_bit_depth == 4)
7564           mask=0x000f;
7565
7566        if (ping_bit_depth == 2)
7567           mask=0x0003;
7568
7569        if (ping_bit_depth == 1)
7570           mask=0x0001;
7571
7572        ping_background.red=(png_uint_16)
7573          (ScaleQuantumToShort(image->background_color.red) & mask);
7574
7575        ping_background.green=(png_uint_16)
7576          (ScaleQuantumToShort(image->background_color.green) & mask);
7577
7578        ping_background.blue=(png_uint_16)
7579          (ScaleQuantumToShort(image->background_color.blue) & mask);
7580     }
7581
7582   if (logging != MagickFalse)
7583     {
7584       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7585           "    Setting up bKGD chunk (1)");
7586
7587       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7588           "    ping_bit_depth=%d",ping_bit_depth);
7589     }
7590
7591   ping_have_bKGD = MagickTrue;
7592   }
7593
7594   /*
7595     Select the color type.
7596   */
7597   matte=image_matte;
7598   old_bit_depth=0;
7599
7600   if (mng_info->write_png8)
7601     {
7602
7603       /* TO DO: make this a function cause it's used twice, except
7604          for reducing the sample depth from 8. */
7605
7606       number_colors=image_colors;
7607
7608       ping_have_tRNS=MagickFalse;
7609
7610       /*
7611         Set image palette.
7612       */
7613       ping_color_type=(png_byte) PNG_COLOR_TYPE_PALETTE;
7614
7615       if (logging != MagickFalse)
7616         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7617             "  Setting up PLTE chunk with %d colors (%d)",
7618             number_colors, image_colors);
7619
7620       for (i=0; i < (ssize_t) number_colors; i++)
7621       {
7622         palette[i].red=ScaleQuantumToChar(image->colormap[i].red);
7623         palette[i].green=ScaleQuantumToChar(image->colormap[i].green);
7624         palette[i].blue=ScaleQuantumToChar(image->colormap[i].blue);
7625         if (logging != MagickFalse)
7626           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7627 #if MAGICKCORE_QUANTUM_DEPTH == 8
7628             "    %3ld (%3d,%3d,%3d)",
7629 #else
7630             "    %5ld (%5d,%5d,%5d)",
7631 #endif
7632             (long) i,palette[i].red,palette[i].green,palette[i].blue);
7633
7634       }
7635
7636       ping_have_PLTE=MagickTrue;
7637       image_depth=ping_bit_depth;
7638       ping_num_trans=0;
7639
7640       if (matte != MagickFalse)
7641       {
7642           /*
7643             Identify which colormap entry is transparent.
7644           */
7645           assert(number_colors <= 256);
7646           assert(image->colormap != NULL);
7647
7648           for (i=0; i < (ssize_t) number_transparent; i++)
7649              ping_trans_alpha[i]=0;
7650
7651           /* PNG8 can't have semitransparent colors so we threshold them
7652            * to 0 or 255
7653            */
7654           for (; i < (ssize_t) number_semitransparent; i++)
7655              ping_trans_alpha[i]=image->colormap[i].opacity >
7656                 OpaqueOpacity/2 ? 0 : 255;
7657
7658           ping_num_trans=(unsigned short) (number_transparent +
7659              number_semitransparent);
7660
7661           if (ping_num_trans == 0)
7662              ping_have_tRNS=MagickFalse;
7663
7664           else
7665              ping_have_tRNS=MagickTrue;
7666       }
7667
7668     if (ping_exclude_bKGD == MagickFalse)
7669       {
7670         /*
7671          * Identify which colormap entry is the background color.
7672          */
7673         for (i=0; i < (ssize_t) MagickMax(1L*number_colors-1L,1L); i++)
7674           if (IsPNGColorEqual(ping_background,image->colormap[i]))
7675             break;
7676
7677         ping_background.index=(png_byte) i;
7678       }
7679     } /* end of write_png8 */
7680
7681   else if (mng_info->write_png24)
7682     {
7683       image_matte=MagickFalse;
7684       ping_color_type=(png_byte) PNG_COLOR_TYPE_RGB;
7685     }
7686
7687   else if (mng_info->write_png32)
7688     {
7689       image_matte=MagickTrue;
7690       ping_color_type=(png_byte) PNG_COLOR_TYPE_RGB_ALPHA;
7691     }
7692
7693   else /* mng_info->write_pngNN not specified */
7694     {
7695       image_depth=ping_bit_depth;
7696
7697       if (mng_info->write_png_colortype != 0)
7698         {
7699           ping_color_type=(png_byte) mng_info->write_png_colortype-1;
7700
7701           if (ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
7702               ping_color_type == PNG_COLOR_TYPE_RGB_ALPHA)
7703             image_matte=MagickTrue;
7704
7705           else
7706             image_matte=MagickFalse;
7707         }
7708
7709       else /* write_ping_colortype not specified */
7710         {
7711           if (logging != MagickFalse)
7712              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7713              "  Selecting PNG colortype:");
7714
7715           ping_color_type=(png_byte) ((matte != MagickFalse)?
7716             PNG_COLOR_TYPE_RGB_ALPHA:PNG_COLOR_TYPE_RGB);
7717
7718           if (image_info->type == TrueColorType)
7719             {
7720               ping_color_type=(png_byte) PNG_COLOR_TYPE_RGB;
7721               image_matte=MagickFalse;
7722             }
7723
7724           if (image_info->type == TrueColorMatteType)
7725             {
7726               ping_color_type=(png_byte) PNG_COLOR_TYPE_RGB_ALPHA;
7727               image_matte=MagickTrue;
7728             }
7729
7730           if (image_info->type == PaletteType ||
7731               image_info->type == PaletteMatteType)
7732             ping_color_type=(png_byte) PNG_COLOR_TYPE_PALETTE;
7733
7734           if (image_info->type == UndefinedType ||
7735              image_info->type == OptimizeType)
7736             {
7737               if (ping_have_color == MagickFalse)
7738                 {
7739                   if (image_matte == MagickFalse)
7740                     {
7741                       ping_color_type=(png_byte) PNG_COLOR_TYPE_GRAY;
7742                       image_matte=MagickFalse;
7743                     }
7744
7745                   else
7746                     {
7747                       ping_color_type=(png_byte) PNG_COLOR_TYPE_GRAY_ALPHA;
7748                       image_matte=MagickTrue;
7749                     }
7750                 }
7751               else
7752                 {
7753                   if (image_matte == MagickFalse)
7754                     {
7755                       ping_color_type=(png_byte) PNG_COLOR_TYPE_RGB;
7756                       image_matte=MagickFalse;
7757                     }
7758
7759                   else
7760                     {
7761                       ping_color_type=(png_byte) PNG_COLOR_TYPE_RGBA;
7762                       image_matte=MagickTrue;
7763                     }
7764                  }
7765             }
7766
7767         }
7768
7769       if (logging != MagickFalse)
7770          (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7771          "    Selected PNG colortype=%d",ping_color_type);
7772
7773       if (ping_bit_depth < 8)
7774         {
7775           if (ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
7776               ping_color_type == PNG_COLOR_TYPE_RGB ||
7777               ping_color_type == PNG_COLOR_TYPE_RGB_ALPHA)
7778             ping_bit_depth=8;
7779         }
7780
7781       old_bit_depth=ping_bit_depth;
7782
7783       if (ping_color_type == PNG_COLOR_TYPE_GRAY)
7784         {
7785           if (image->matte == MagickFalse && ping_have_non_bw == MagickFalse)
7786              ping_bit_depth=1;
7787         }
7788
7789       if (ping_color_type == PNG_COLOR_TYPE_PALETTE)
7790         {
7791            size_t one = 1;
7792            ping_bit_depth=1;
7793
7794            if (image->colors == 0)
7795            {
7796               /* DO SOMETHING */
7797               (void) ThrowMagickException(&image->exception,
7798                  GetMagickModule(),CoderError,
7799                 "image has 0 colors", "`%s'","");
7800            }
7801
7802            while ((int) (one << ping_bit_depth) < (ssize_t) image_colors)
7803              ping_bit_depth <<= 1;
7804         }
7805
7806       if (logging != MagickFalse)
7807          {
7808            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7809             "    Number of colors: %.20g",(double) image_colors);
7810
7811            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7812             "    Tentative PNG bit depth: %d",ping_bit_depth);
7813          }
7814
7815       if (ping_bit_depth < (int) mng_info->write_png_depth)
7816          ping_bit_depth = mng_info->write_png_depth;
7817     }
7818
7819   image_depth=ping_bit_depth;
7820
7821   if (logging != MagickFalse)
7822     {
7823       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7824         "    Tentative PNG color type: %.20g",(double) ping_color_type);
7825
7826       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7827         "    image_info->type: %.20g",(double) image_info->type);
7828
7829       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7830         "    image_depth: %.20g",(double) image_depth);
7831
7832       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7833
7834         "    image->depth: %.20g",(double) image->depth);
7835
7836       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7837         "    ping_bit_depth: %.20g",(double) ping_bit_depth);
7838     }
7839
7840   if (matte != MagickFalse)
7841     {
7842       if (mng_info->IsPalette)
7843         {
7844
7845           ping_color_type=PNG_COLOR_TYPE_GRAY_ALPHA;
7846
7847           if (ping_have_color != MagickFalse)
7848              ping_color_type=PNG_COLOR_TYPE_RGBA;
7849
7850           /*
7851            * Determine if there is any transparent color.
7852           */
7853           if (number_transparent + number_semitransparent == 0)
7854             {
7855               /*
7856                 No transparent pixels are present.  Change 4 or 6 to 0 or 2.
7857               */
7858
7859               image_matte=MagickFalse;
7860               ping_color_type&=0x03;
7861             }
7862
7863           else
7864             {
7865               unsigned int
7866                 mask;
7867
7868               mask=0xffff;
7869
7870               if (ping_bit_depth == 8)
7871                  mask=0x00ff;
7872
7873               if (ping_bit_depth == 4)
7874                  mask=0x000f;
7875
7876               if (ping_bit_depth == 2)
7877                  mask=0x0003;
7878
7879               if (ping_bit_depth == 1)
7880                  mask=0x0001;
7881
7882               ping_trans_color.red=(png_uint_16)
7883                 (ScaleQuantumToShort(image->colormap[0].red) & mask);
7884
7885               ping_trans_color.green=(png_uint_16)
7886                 (ScaleQuantumToShort(image->colormap[0].green) & mask);
7887
7888               ping_trans_color.blue=(png_uint_16)
7889                 (ScaleQuantumToShort(image->colormap[0].blue) & mask);
7890
7891               ping_trans_color.gray=(png_uint_16)
7892                 (ScaleQuantumToShort(PixelIntensityToQuantum(
7893                    image->colormap)) & mask);
7894
7895               ping_trans_color.index=(png_byte) 0;
7896
7897               ping_have_tRNS=MagickTrue;
7898             }
7899
7900           if (ping_have_tRNS != MagickFalse)
7901             {
7902               /*
7903                 Determine if there is one and only one transparent color
7904                 and if so if it is fully transparent.
7905               */
7906               if (logging != MagickFalse)
7907                  (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7908                     "  Is there a single fully transparent color?");
7909
7910               if (number_transparent > 1 || number_semitransparent > 0)
7911               {
7912                 ping_have_tRNS = MagickFalse;
7913                 if (logging != MagickFalse)
7914                  (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7915                     "  ... No.");
7916               }
7917               else
7918               {
7919                 if (logging != MagickFalse)
7920                  (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7921                     "  ... Yes: (%d,%d,%d), (gray: %d)",
7922                     (int) ping_trans_color.red,
7923                     (int) ping_trans_color.green,
7924                     (int) ping_trans_color.blue,
7925                     (int) ping_trans_color.gray);
7926               }
7927             }
7928
7929           if (ping_have_tRNS != MagickFalse)
7930             {
7931               ping_color_type &= 0x03;  /* changes 4 or 6 to 0 or 2 */
7932
7933               if (image_depth == 8)
7934                 {
7935                   ping_trans_color.red&=0xff;
7936                   ping_trans_color.green&=0xff;
7937                   ping_trans_color.blue&=0xff;
7938                   ping_trans_color.gray&=0xff;
7939                 }
7940             }
7941         }
7942       else
7943         {
7944           if (image_depth == 8)
7945             {
7946               ping_trans_color.red&=0xff;
7947               ping_trans_color.green&=0xff;
7948               ping_trans_color.blue&=0xff;
7949               ping_trans_color.gray&=0xff;
7950             }
7951         }
7952     }
7953
7954     matte=image_matte;
7955
7956     if (ping_have_tRNS != MagickFalse)
7957       image_matte=MagickFalse;
7958
7959     if ((mng_info->IsPalette) &&
7960         mng_info->write_png_colortype-1 != PNG_COLOR_TYPE_PALETTE &&
7961         ping_have_color == MagickFalse &&
7962         (image_matte == MagickFalse || image_depth >= 8))
7963       {
7964         size_t one=1;
7965
7966         if (image_matte != MagickFalse)
7967           ping_color_type=PNG_COLOR_TYPE_GRAY_ALPHA;
7968
7969         else
7970           {
7971             ping_color_type=PNG_COLOR_TYPE_GRAY;
7972
7973             if (save_image_depth == 16 && image_depth == 8)
7974               {
7975                 if (logging != MagickFalse)
7976                   {
7977                     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
7978                         "  Scaling ping_trans_color (0)");
7979                   }
7980                     ping_trans_color.gray*=0x0101;
7981               }
7982           }
7983
7984         if (image_depth > MAGICKCORE_QUANTUM_DEPTH)
7985           image_depth=MAGICKCORE_QUANTUM_DEPTH;
7986
7987         if (image_colors == 0 || image_colors-1 > MaxColormapSize)
7988           image_colors=(int) (one << image_depth);
7989
7990         if (image_depth > 8)
7991           ping_bit_depth=16;
7992
7993         else
7994           {
7995             ping_bit_depth=8;
7996             if ((int) ping_color_type == PNG_COLOR_TYPE_PALETTE)
7997               {
7998                 if(!mng_info->write_png_depth)
7999                   {
8000                     ping_bit_depth=1;
8001
8002                     while ((int) (one << ping_bit_depth)
8003                         < (ssize_t) image_colors)
8004                       ping_bit_depth <<= 1;
8005                   }
8006               }
8007
8008 #if 0 /* TO DO: Enable this when low bit-depth grayscale is working */
8009             else if (ping_color_type ==
8010                 PNG_COLOR_TYPE_GRAY && image_colors < 17 &&
8011                 mng_info->IsPalette)
8012               {
8013
8014               /* Check if grayscale is reducible */
8015                 int
8016                   depth_4_ok=MagickTrue,
8017                   depth_2_ok=MagickTrue,
8018                   depth_1_ok=MagickTrue;
8019
8020                 for (i=0; i < (ssize_t) image_colors; i++)
8021                 {
8022                    unsigned char
8023                      intensity;
8024
8025                    intensity=ScaleQuantumToChar(image->colormap[i].red);
8026
8027                    if ((intensity & 0x0f) != ((intensity & 0xf0) >> 4))
8028                      depth_4_ok=depth_2_ok=depth_1_ok=MagickFalse;
8029
8030                    else if ((intensity & 0x03) != ((intensity & 0x0c) >> 2))
8031                      depth_2_ok=depth_1_ok=MagickFalse;
8032
8033                    else if ((intensity & 0x01) != ((intensity & 0x02) >> 1))
8034                      depth_1_ok=MagickFalse;
8035                 }
8036
8037                 if (depth_1_ok && mng_info->write_png_depth <= 1)
8038                   ping_bit_depth=1;
8039
8040                 else if (depth_2_ok && mng_info->write_png_depth <= 2)
8041                   ping_bit_depth=2;
8042
8043                 else if (depth_4_ok && mng_info->write_png_depth <= 4)
8044                   ping_bit_depth=4;
8045               }
8046 #endif /* 0 */
8047           }
8048
8049           image_depth=ping_bit_depth;
8050       }
8051
8052     else
8053
8054       if (mng_info->IsPalette)
8055       {
8056         number_colors=image_colors;
8057
8058         if (image_depth <= 8)
8059           {
8060             /*
8061               Set image palette.
8062             */
8063             ping_color_type=(png_byte) PNG_COLOR_TYPE_PALETTE;
8064
8065             if (mng_info->have_write_global_plte && matte == MagickFalse)
8066               {
8067                 png_set_PLTE(ping,ping_info,NULL,0);
8068
8069                 if (logging != MagickFalse)
8070                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8071                     "  Setting up empty PLTE chunk");
8072               }
8073
8074             else
8075               {
8076                 for (i=0; i < (ssize_t) number_colors; i++)
8077                 {
8078                   palette[i].red=ScaleQuantumToChar(image->colormap[i].red);
8079                   palette[i].green=ScaleQuantumToChar(image->colormap[i].green);
8080                   palette[i].blue=ScaleQuantumToChar(image->colormap[i].blue);
8081                 }
8082
8083                 if (logging != MagickFalse)
8084                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8085                     "  Setting up PLTE chunk with %d colors",
8086                     number_colors);
8087
8088                 ping_have_PLTE=MagickTrue;
8089               }
8090
8091             /* color_type is PNG_COLOR_TYPE_PALETTE */
8092             if (mng_info->write_png_depth == 0)
8093               {
8094                 size_t
8095                   one;
8096
8097                 ping_bit_depth=1;
8098                 one=1;
8099
8100                 while ((one << ping_bit_depth) < number_colors)
8101                   ping_bit_depth <<= 1;
8102               }
8103
8104             ping_num_trans=0;
8105
8106             if (matte != MagickFalse)
8107               {
8108                 /*
8109                  * Set up trans_colors array.
8110                  */
8111                 assert(number_colors <= 256);
8112
8113                 ping_num_trans=(unsigned short) (number_transparent +
8114                   number_semitransparent);
8115
8116                 if (ping_num_trans == 0)
8117                   ping_have_tRNS=MagickFalse;
8118
8119                 else
8120                   {
8121                     if (logging != MagickFalse)
8122                       {
8123                         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8124                           "  Scaling ping_trans_color (1)");
8125                       }
8126                     ping_have_tRNS=MagickTrue;
8127
8128                     for (i=0; i < ping_num_trans; i++)
8129                     {
8130                        ping_trans_alpha[i]= (png_byte) (255-
8131                           ScaleQuantumToChar(image->colormap[i].opacity));
8132                     }
8133                   }
8134               }
8135           }
8136       }
8137
8138     else
8139       {
8140
8141         if (image_depth < 8)
8142           image_depth=8;
8143
8144         if ((save_image_depth == 16) && (image_depth == 8))
8145           {
8146             if (logging != MagickFalse)
8147               {
8148                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8149                   "    Scaling ping_trans_color from (%d,%d,%d)",
8150                   (int) ping_trans_color.red,
8151                   (int) ping_trans_color.green,
8152                   (int) ping_trans_color.blue);
8153               }
8154
8155             ping_trans_color.red*=0x0101;
8156             ping_trans_color.green*=0x0101;
8157             ping_trans_color.blue*=0x0101;
8158             ping_trans_color.gray*=0x0101;
8159
8160             if (logging != MagickFalse)
8161               {
8162                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8163                   "    to (%d,%d,%d)",
8164                   (int) ping_trans_color.red,
8165                   (int) ping_trans_color.green,
8166                   (int) ping_trans_color.blue);
8167               }
8168           }
8169       }
8170
8171     if (ping_bit_depth <  (ssize_t) mng_info->write_png_depth)
8172          ping_bit_depth =  (ssize_t) mng_info->write_png_depth;
8173
8174     /*
8175       Adjust background and transparency samples in sub-8-bit grayscale files.
8176     */
8177     if (ping_bit_depth < 8 && ping_color_type ==
8178         PNG_COLOR_TYPE_GRAY)
8179       {
8180          png_uint_16
8181            maxval;
8182
8183          size_t
8184            one=1;
8185
8186          maxval=(png_uint_16) ((one << ping_bit_depth)-1);
8187
8188          if (ping_exclude_bKGD == MagickFalse)
8189          {
8190
8191          ping_background.gray=(png_uint_16)
8192            (QuantumScale*(maxval*(PixelIntensity(&image->background_color))));
8193
8194          if (logging != MagickFalse)
8195            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8196              "  Setting up bKGD chunk (2)");
8197
8198          ping_have_bKGD = MagickTrue;
8199          }
8200
8201          ping_trans_color.gray=(png_uint_16) (QuantumScale*(maxval*
8202            ping_trans_color.gray));
8203       }
8204
8205   if (ping_exclude_bKGD == MagickFalse)
8206   {
8207     if ((int) ping_color_type == PNG_COLOR_TYPE_PALETTE)
8208       {
8209         /*
8210            Identify which colormap entry is the background color.
8211         */
8212
8213         number_colors=image_colors;
8214
8215         for (i=0; i < (ssize_t) MagickMax(1L*number_colors,1L); i++)
8216           if (IsPNGColorEqual(image->background_color,image->colormap[i]))
8217             break;
8218
8219         ping_background.index=(png_byte) i;
8220
8221         if (logging != MagickFalse)
8222           {
8223             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8224               "  Setting up bKGD chunk with index=%d",(int) i);
8225           }
8226
8227         if (i < (ssize_t) number_colors)
8228           {
8229             ping_have_bKGD = MagickTrue;
8230
8231             if (logging != MagickFalse)
8232               {
8233                 (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8234                   "     background   =(%d,%d,%d)",
8235                         (int) ping_background.red,
8236                         (int) ping_background.green,
8237                         (int) ping_background.blue);
8238               }
8239           }
8240
8241         else  /* Can't happen */
8242           {
8243             if (logging != MagickFalse)
8244               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8245                   "      No room in PLTE to add bKGD color");
8246             ping_have_bKGD = MagickFalse;
8247           }
8248       }
8249   }
8250
8251   if (logging != MagickFalse)
8252     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8253       "    PNG color type: %d",ping_color_type);
8254   /*
8255     Initialize compression level and filtering.
8256   */
8257   if (logging != MagickFalse)
8258     {
8259       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8260         "  Setting up deflate compression");
8261
8262       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8263         "    Compression buffer size: 32768");
8264     }
8265
8266   png_set_compression_buffer_size(ping,32768L);
8267
8268   if (logging != MagickFalse)
8269     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8270       "    Compression mem level: 9");
8271
8272   png_set_compression_mem_level(ping, 9);
8273
8274   quality=image->quality == UndefinedCompressionQuality ? 75UL :
8275      image->quality;
8276
8277   if (quality > 9)
8278     {
8279       int
8280         level;
8281
8282       level=(int) MagickMin((ssize_t) quality/10,9);
8283
8284       if (logging != MagickFalse)
8285         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8286           "    Compression level: %d",level);
8287
8288       png_set_compression_level(ping,level);
8289     }
8290
8291   else
8292     {
8293       if (logging != MagickFalse)
8294         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8295           "    Compression strategy: Z_HUFFMAN_ONLY");
8296
8297       png_set_compression_strategy(ping, Z_HUFFMAN_ONLY);
8298     }
8299
8300   if (logging != MagickFalse)
8301     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8302       "  Setting up filtering");
8303
8304 #if defined(PNG_MNG_FEATURES_SUPPORTED) && defined(PNG_INTRAPIXEL_DIFFERENCING)
8305   /* This became available in libpng-1.0.9.  Output must be a MNG. */
8306   if (mng_info->write_mng && ((quality % 10) == 7))
8307     {
8308       if (logging != MagickFalse)
8309         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8310           "    Filter_type: PNG_INTRAPIXEL_DIFFERENCING");
8311
8312       ping_filter_method=PNG_INTRAPIXEL_DIFFERENCING;
8313     }
8314
8315   else
8316     if (logging != MagickFalse)
8317       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8318         "    Filter_type: 0");
8319 #endif
8320
8321   {
8322     int
8323       base_filter;
8324
8325     if ((quality % 10) > 5)
8326       base_filter=PNG_ALL_FILTERS;
8327
8328     else
8329       if ((quality % 10) != 5)
8330         base_filter=(int) quality % 10;
8331
8332       else
8333         if (((int) ping_color_type == PNG_COLOR_TYPE_GRAY) ||
8334             ((int) ping_color_type == PNG_COLOR_TYPE_PALETTE) ||
8335             (quality < 50))
8336           base_filter=PNG_NO_FILTERS;
8337
8338         else
8339           base_filter=PNG_ALL_FILTERS;
8340
8341     if (logging != MagickFalse)
8342       {
8343         if (base_filter == PNG_ALL_FILTERS)
8344           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8345             "    Base filter method: ADAPTIVE");
8346         else
8347           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8348             "    Base filter method: NONE");
8349       }
8350
8351     png_set_filter(ping,PNG_FILTER_TYPE_BASE,base_filter);
8352   }
8353
8354   if (ping_exclude_iCCP == MagickFalse || ping_exclude_zCCP == MagickFalse)
8355     {
8356       ResetImageProfileIterator(image);
8357       for (name=GetNextImageProfile(image); name != (const char *) NULL; )
8358       {
8359         profile=GetImageProfile(image,name);
8360
8361         if (profile != (StringInfo *) NULL)
8362           {
8363 #ifdef PNG_WRITE_iCCP_SUPPORTED
8364             if ((LocaleCompare(name,"ICC") == 0) ||
8365                 (LocaleCompare(name,"ICM") == 0))
8366              {
8367
8368                if (ping_exclude_iCCP == MagickFalse)
8369                  {
8370                        png_set_iCCP(ping,ping_info,(const png_charp) name,0,
8371 #if (PNG_LIBPNG_VER < 10500)
8372                          (png_charp) GetStringInfoDatum(profile),
8373 #else
8374                          (png_const_bytep) GetStringInfoDatum(profile),
8375 #endif
8376                          (png_uint_32) GetStringInfoLength(profile));
8377                  }
8378              }
8379
8380             else
8381 #endif
8382               if (ping_exclude_zCCP == MagickFalse)
8383                 {
8384                   Magick_png_write_raw_profile(image_info,ping,ping_info,
8385                     (unsigned char *) name,(unsigned char *) name,
8386                     GetStringInfoDatum(profile),
8387                     (png_uint_32) GetStringInfoLength(profile));
8388                 }
8389           }
8390
8391           if (logging != MagickFalse)
8392             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8393               "  Setting up text chunk with %s profile",name);
8394
8395         name=GetNextImageProfile(image);
8396       }
8397   }
8398
8399 #if defined(PNG_WRITE_sRGB_SUPPORTED)
8400   if ((mng_info->have_write_global_srgb == 0) &&
8401       ((image->rendering_intent != UndefinedIntent) ||
8402       (image->colorspace == sRGBColorspace)))
8403     {
8404       if (ping_exclude_sRGB == MagickFalse)
8405         {
8406           /*
8407             Note image rendering intent.
8408           */
8409           if (logging != MagickFalse)
8410             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8411                 "  Setting up sRGB chunk");
8412
8413           (void) png_set_sRGB(ping,ping_info,(
8414             Magick_RenderingIntent_to_PNG_RenderingIntent(
8415               image->rendering_intent)));
8416
8417           if (ping_exclude_gAMA == MagickFalse)
8418             png_set_gAMA(ping,ping_info,0.45455);
8419         }
8420     }
8421
8422   if ((!mng_info->write_mng) || (!png_get_valid(ping,ping_info,PNG_INFO_sRGB)))
8423 #endif
8424     {
8425       if (ping_exclude_gAMA == MagickFalse &&
8426           (ping_exclude_sRGB == MagickFalse ||
8427           (image->gamma < .45 || image->gamma > .46)))
8428       {
8429       if ((mng_info->have_write_global_gama == 0) && (image->gamma != 0.0))
8430         {
8431           /*
8432             Note image gamma.
8433             To do: check for cHRM+gAMA == sRGB, and write sRGB instead.
8434           */
8435           if (logging != MagickFalse)
8436             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8437               "  Setting up gAMA chunk");
8438
8439           png_set_gAMA(ping,ping_info,image->gamma);
8440         }
8441       }
8442
8443       if (ping_exclude_cHRM == MagickFalse)
8444         {
8445           if ((mng_info->have_write_global_chrm == 0) &&
8446               (image->chromaticity.red_primary.x != 0.0))
8447             {
8448               /*
8449                 Note image chromaticity.
8450                 To do: check for cHRM+gAMA == sRGB, and write sRGB instead.
8451               */
8452                PrimaryInfo
8453                  bp,
8454                  gp,
8455                  rp,
8456                  wp;
8457
8458                wp=image->chromaticity.white_point;
8459                rp=image->chromaticity.red_primary;
8460                gp=image->chromaticity.green_primary;
8461                bp=image->chromaticity.blue_primary;
8462
8463                if (logging != MagickFalse)
8464                  (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8465                    "  Setting up cHRM chunk");
8466
8467                png_set_cHRM(ping,ping_info,wp.x,wp.y,rp.x,rp.y,gp.x,gp.y,
8468                    bp.x,bp.y);
8469            }
8470         }
8471     }
8472
8473   ping_interlace_method=image_info->interlace != NoInterlace;
8474
8475   if (mng_info->write_mng)
8476     png_set_sig_bytes(ping,8);
8477
8478   /* Bail out if cannot meet defined PNG:bit-depth or PNG:color-type */
8479
8480   if (mng_info->write_png_colortype != 0)
8481     {
8482      if (mng_info->write_png_colortype-1 == PNG_COLOR_TYPE_GRAY)
8483        if (ping_have_color != MagickFalse)
8484          {
8485            ping_color_type = PNG_COLOR_TYPE_RGB;
8486
8487            if (ping_bit_depth < 8)
8488              ping_bit_depth=8;
8489          }
8490
8491      if (mng_info->write_png_colortype-1 == PNG_COLOR_TYPE_GRAY_ALPHA)
8492        if (ping_have_color != MagickFalse)
8493          ping_color_type = PNG_COLOR_TYPE_RGB_ALPHA;
8494     }
8495
8496   if (ping_need_colortype_warning != MagickFalse ||
8497      ((mng_info->write_png_depth &&
8498      (int) mng_info->write_png_depth != ping_bit_depth) ||
8499      (mng_info->write_png_colortype &&
8500      ((int) mng_info->write_png_colortype-1 != ping_color_type &&
8501       mng_info->write_png_colortype != 7 &&
8502       !(mng_info->write_png_colortype == 5 && ping_color_type == 0)))))
8503     {
8504       if (logging != MagickFalse)
8505         {
8506           if (ping_need_colortype_warning != MagickFalse)
8507             {
8508               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8509                  "  Image has transparency but tRNS chunk was excluded");
8510             }
8511
8512           if (mng_info->write_png_depth)
8513             {
8514               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8515                   "  Defined PNG:bit-depth=%u, Computed depth=%u",
8516                   mng_info->write_png_depth,
8517                   ping_bit_depth);
8518             }
8519
8520           if (mng_info->write_png_colortype)
8521             {
8522               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8523                   "  Defined PNG:color-type=%u, Computed color type=%u",
8524                   mng_info->write_png_colortype-1,
8525                   ping_color_type);
8526             }
8527         }
8528
8529       png_warning(ping,
8530         "Cannot write image with defined PNG:bit-depth or PNG:color-type.");
8531     }
8532
8533   if (image_matte != MagickFalse && image->matte == MagickFalse)
8534     {
8535       /* Add an opaque matte channel */
8536       image->matte = MagickTrue;
8537       (void) SetImageOpacity(image,0);
8538
8539       if (logging != MagickFalse)
8540         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8541           "  Added an opaque matte channel");
8542     }
8543
8544   if (number_transparent != 0 || number_semitransparent != 0)
8545     {
8546       if (ping_color_type < 4)
8547         {
8548            ping_have_tRNS=MagickTrue;
8549            if (logging != MagickFalse)
8550              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8551                "  Setting ping_have_tRNS=MagickTrue.");
8552         }
8553     }
8554
8555   if (logging != MagickFalse)
8556     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8557       "  Writing PNG header chunks");
8558
8559   png_set_IHDR(ping,ping_info,ping_width,ping_height,
8560                ping_bit_depth,ping_color_type,
8561                ping_interlace_method,ping_compression_method,
8562                ping_filter_method);
8563
8564   if (ping_color_type == 3 && ping_have_PLTE != MagickFalse)
8565     {
8566       png_set_PLTE(ping,ping_info,palette,number_colors);
8567
8568       if (logging != MagickFalse)
8569         {
8570           for (i=0; i< (ssize_t) number_colors; i++)
8571           {
8572             if (i < ping_num_trans)
8573               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8574                 "     PLTE[%d] = (%d,%d,%d), tRNS[%d] = (%d)",
8575                       (int) i,
8576                       (int) palette[i].red,
8577                       (int) palette[i].green,
8578                       (int) palette[i].blue,
8579                       (int) i,
8580                       (int) ping_trans_alpha[i]);
8581              else
8582               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8583                 "     PLTE[%d] = (%d,%d,%d)",
8584                       (int) i,
8585                       (int) palette[i].red,
8586                       (int) palette[i].green,
8587                       (int) palette[i].blue);
8588            }
8589          }
8590     }
8591
8592   if (ping_exclude_bKGD == MagickFalse)
8593     {
8594       if (ping_have_bKGD != MagickFalse)
8595           png_set_bKGD(ping,ping_info,&ping_background);
8596     }
8597
8598   if (ping_exclude_pHYs == MagickFalse)
8599     {
8600       if (ping_have_pHYs != MagickFalse)
8601         {
8602           png_set_pHYs(ping,ping_info,
8603              ping_pHYs_x_resolution,
8604              ping_pHYs_y_resolution,
8605              ping_pHYs_unit_type);
8606         }
8607     }
8608
8609 #if defined(PNG_oFFs_SUPPORTED)
8610   if (ping_exclude_oFFs == MagickFalse)
8611     {
8612       if (image->page.x || image->page.y)
8613         {
8614            png_set_oFFs(ping,ping_info,(png_int_32) image->page.x,
8615               (png_int_32) image->page.y, 0);
8616
8617            if (logging != MagickFalse)
8618              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8619                  "    Setting up oFFs chunk with x=%d, y=%d, units=0",
8620                  (int) image->page.x, (int) image->page.y);
8621         }
8622     }
8623 #endif
8624
8625   png_write_info_before_PLTE(ping, ping_info);
8626
8627   if (ping_have_tRNS != MagickFalse && ping_color_type < 4)
8628     {
8629       if (logging != MagickFalse)
8630         {
8631           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8632               "  Calling png_set_tRNS with num_trans=%d",ping_num_trans);
8633         }
8634
8635       if (ping_color_type == 3)
8636          (void) png_set_tRNS(ping, ping_info,
8637                 ping_trans_alpha,
8638                 ping_num_trans,
8639                 NULL);
8640
8641       else
8642         {
8643            (void) png_set_tRNS(ping, ping_info,
8644                   NULL,
8645                   0,
8646                   &ping_trans_color);
8647
8648            if (logging != MagickFalse)
8649              {
8650                (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8651                  "     tRNS color   =(%d,%d,%d)",
8652                        (int) ping_trans_color.red,
8653                        (int) ping_trans_color.green,
8654                        (int) ping_trans_color.blue);
8655              }
8656          }
8657     }
8658
8659   /* write any png-chunk-b profiles */
8660   (void) Magick_png_write_chunk_from_profile(image,"PNG-chunk-b",logging);
8661   png_write_info(ping,ping_info);
8662
8663   /* write any PNG-chunk-m profiles */
8664   (void) Magick_png_write_chunk_from_profile(image,"PNG-chunk-m",logging);
8665
8666   if (ping_exclude_vpAg == MagickFalse)
8667     {
8668       if ((image->page.width != 0 && image->page.width != image->columns) ||
8669           (image->page.height != 0 && image->page.height != image->rows))
8670         {
8671           unsigned char
8672             chunk[14];
8673
8674           (void) WriteBlobMSBULong(image,9L);  /* data length=8 */
8675           PNGType(chunk,mng_vpAg);
8676           LogPNGChunk(logging,mng_vpAg,9L);
8677           PNGLong(chunk+4,(png_uint_32) image->page.width);
8678           PNGLong(chunk+8,(png_uint_32) image->page.height);
8679           chunk[12]=0;   /* unit = pixels */
8680           (void) WriteBlob(image,13,chunk);
8681           (void) WriteBlobMSBULong(image,crc32(0,chunk,13));
8682         }
8683     }
8684
8685 #if (PNG_LIBPNG_VER == 10206)
8686     /* avoid libpng-1.2.6 bug by setting PNG_HAVE_IDAT flag */
8687 #define PNG_HAVE_IDAT               0x04
8688     ping->mode |= PNG_HAVE_IDAT;
8689 #undef PNG_HAVE_IDAT
8690 #endif
8691
8692   png_set_packing(ping);
8693   /*
8694     Allocate memory.
8695   */
8696   rowbytes=image->columns;
8697   if (image_depth > 8)
8698     rowbytes*=2;
8699   switch (ping_color_type)
8700     {
8701       case PNG_COLOR_TYPE_RGB:
8702         rowbytes*=3;
8703         break;
8704
8705       case PNG_COLOR_TYPE_GRAY_ALPHA:
8706         rowbytes*=2;
8707         break;
8708
8709       case PNG_COLOR_TYPE_RGBA:
8710         rowbytes*=4;
8711         break;
8712
8713       default:
8714         break;
8715     }
8716
8717   if (logging != MagickFalse)
8718     {
8719       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8720         "  Writing PNG image data");
8721
8722       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8723         "    Allocating %.20g bytes of memory for pixels",(double) rowbytes);
8724     }
8725   ping_pixels=(unsigned char *) AcquireQuantumMemory(rowbytes,
8726     sizeof(*ping_pixels));
8727
8728   if (ping_pixels == (unsigned char *) NULL)
8729     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
8730
8731   /*
8732     Initialize image scanlines.
8733   */
8734   if (setjmp(png_jmpbuf(ping)))
8735     {
8736       /*
8737         PNG write failed.
8738       */
8739 #ifdef PNG_DEBUG
8740      if (image_info->verbose)
8741         (void) printf("PNG write has failed.\n");
8742 #endif
8743       png_destroy_write_struct(&ping,&ping_info);
8744       if (quantum_info != (QuantumInfo *) NULL)
8745         quantum_info=DestroyQuantumInfo(quantum_info);
8746       if (ping_pixels != (unsigned char *) NULL)
8747         ping_pixels=(unsigned char *) RelinquishMagickMemory(ping_pixels);
8748 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
8749       UnlockSemaphoreInfo(ping_semaphore);
8750 #endif
8751       if (mng_info->need_blob != MagickFalse)
8752           (void) CloseBlob(image);
8753       image_info=DestroyImageInfo(image_info);
8754       image=DestroyImage(image);
8755       return(MagickFalse);
8756     }
8757   quantum_info=AcquireQuantumInfo(image_info,image);
8758   if (quantum_info == (QuantumInfo *) NULL)
8759     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
8760   quantum_info->format=UndefinedQuantumFormat;
8761   quantum_info->depth=image_depth;
8762   num_passes=png_set_interlace_handling(ping);
8763
8764   if ((!mng_info->write_png8 && !mng_info->write_png24 &&
8765        !mng_info->write_png32) &&
8766        (mng_info->IsPalette ||
8767        (image_info->type == BilevelType)) &&
8768        image_matte == MagickFalse &&
8769        ping_have_non_bw == MagickFalse)
8770     {
8771       /* Palette, Bilevel, or Opaque Monochrome */
8772       register const PixelPacket
8773         *p;
8774
8775       quantum_info->depth=8;
8776       for (pass=0; pass < num_passes; pass++)
8777       {
8778         /*
8779           Convert PseudoClass image to a PNG monochrome image.
8780         */
8781         for (y=0; y < (ssize_t) image->rows; y++)
8782         {
8783
8784           if (logging != MagickFalse)
8785              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8786                  "    Writing row of pixels (0)");
8787
8788           p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
8789
8790           if (p == (const PixelPacket *) NULL)
8791             break;
8792
8793           if (mng_info->IsPalette)
8794             {
8795               (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8796                 quantum_info,GrayQuantum,ping_pixels,&image->exception);
8797               if (mng_info->write_png_colortype-1 == PNG_COLOR_TYPE_PALETTE &&
8798                   mng_info->write_png_depth &&
8799                   mng_info->write_png_depth != old_bit_depth)
8800                 {
8801                   /* Undo pixel scaling */
8802                   for (i=0; i < (ssize_t) image->columns; i++)
8803                      *(ping_pixels+i)=(unsigned char) (*(ping_pixels+i)
8804                      >> (8-old_bit_depth));
8805                 }
8806             }
8807
8808           else
8809             {
8810               (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8811                 quantum_info,RedQuantum,ping_pixels,&image->exception);
8812             }
8813
8814           if (mng_info->write_png_colortype-1 != PNG_COLOR_TYPE_PALETTE)
8815             for (i=0; i < (ssize_t) image->columns; i++)
8816                *(ping_pixels+i)=(unsigned char) ((*(ping_pixels+i) > 127) ?
8817                       255 : 0);
8818
8819           if (logging != MagickFalse && y == 0)
8820             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8821                 "    Writing row of pixels (1)");
8822
8823           png_write_row(ping,ping_pixels);
8824         }
8825         if (image->previous == (Image *) NULL)
8826           {
8827             status=SetImageProgress(image,LoadImageTag,pass,num_passes);
8828             if (status == MagickFalse)
8829               break;
8830           }
8831       }
8832     }
8833
8834   else   /* Not Palette, Bilevel, or Opaque Monochrome */
8835     {
8836       if ((!mng_info->write_png8 && !mng_info->write_png24 &&
8837          !mng_info->write_png32) &&
8838          (image_matte != MagickFalse ||
8839          (ping_bit_depth >= MAGICKCORE_QUANTUM_DEPTH)) &&
8840          (mng_info->IsPalette) && ping_have_color == MagickFalse)
8841         {
8842           register const PixelPacket
8843             *p;
8844
8845           for (pass=0; pass < num_passes; pass++)
8846           {
8847
8848           for (y=0; y < (ssize_t) image->rows; y++)
8849           {
8850             p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
8851
8852             if (p == (const PixelPacket *) NULL)
8853               break;
8854
8855             if (ping_color_type == PNG_COLOR_TYPE_GRAY)
8856               {
8857                 if (mng_info->IsPalette)
8858                   (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8859                     quantum_info,GrayQuantum,ping_pixels,&image->exception);
8860
8861                 else
8862                   (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8863                     quantum_info,RedQuantum,ping_pixels,&image->exception);
8864
8865                 if (logging != MagickFalse && y == 0)
8866                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8867                        "    Writing GRAY PNG pixels (2)");
8868               }
8869
8870             else /* PNG_COLOR_TYPE_GRAY_ALPHA */
8871               {
8872                 if (logging != MagickFalse && y == 0)
8873                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8874                          "    Writing GRAY_ALPHA PNG pixels (2)");
8875
8876                 (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8877                   quantum_info,GrayAlphaQuantum,ping_pixels,&image->exception);
8878               }
8879
8880             if (logging != MagickFalse && y == 0)
8881               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8882                   "    Writing row of pixels (2)");
8883
8884             png_write_row(ping,ping_pixels);
8885           }
8886
8887           if (image->previous == (Image *) NULL)
8888             {
8889               status=SetImageProgress(image,LoadImageTag,pass,num_passes);
8890               if (status == MagickFalse)
8891                 break;
8892             }
8893           }
8894         }
8895
8896       else
8897         {
8898           register const PixelPacket
8899             *p;
8900
8901           for (pass=0; pass < num_passes; pass++)
8902           {
8903             if ((image_depth > 8) || (mng_info->write_png24 ||
8904                 mng_info->write_png32 ||
8905                 (!mng_info->write_png8 && !mng_info->IsPalette)))
8906             {
8907               for (y=0; y < (ssize_t) image->rows; y++)
8908               {
8909                 p=GetVirtualPixels(image,0,y,image->columns,1,
8910                    &image->exception);
8911
8912                 if (p == (const PixelPacket *) NULL)
8913                   break;
8914
8915                 if (ping_color_type == PNG_COLOR_TYPE_GRAY)
8916                   {
8917                     if (image->storage_class == DirectClass)
8918                       (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8919                         quantum_info,RedQuantum,ping_pixels,&image->exception);
8920
8921                     else
8922                       (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8923                         quantum_info,GrayQuantum,ping_pixels,&image->exception);
8924                   }
8925
8926                 else if (ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
8927                   {
8928                     (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8929                       quantum_info,GrayAlphaQuantum,ping_pixels,
8930                       &image->exception);
8931
8932                     if (logging != MagickFalse && y == 0)
8933                       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8934                            "    Writing GRAY_ALPHA PNG pixels (3)");
8935                   }
8936
8937                 else if (image_matte != MagickFalse)
8938                   (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8939                     quantum_info,RGBAQuantum,ping_pixels,&image->exception);
8940
8941                 else
8942                   (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8943                     quantum_info,RGBQuantum,ping_pixels,&image->exception);
8944
8945                 if (logging != MagickFalse && y == 0)
8946                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8947                       "    Writing row of pixels (3)");
8948
8949                 png_write_row(ping,ping_pixels);
8950               }
8951             }
8952
8953           else
8954             /* not ((image_depth > 8) || (mng_info->write_png24 ||
8955                 mng_info->write_png32 ||
8956                 (!mng_info->write_png8 && !mng_info->IsPalette))) */
8957             {
8958               if ((ping_color_type != PNG_COLOR_TYPE_GRAY) &&
8959                   (ping_color_type != PNG_COLOR_TYPE_GRAY_ALPHA))
8960                 {
8961                   if (logging != MagickFalse)
8962                     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8963                       "  pass %d, Image Is not GRAY or GRAY_ALPHA",pass);
8964
8965                   quantum_info->depth=8;
8966                   image_depth=8;
8967                 }
8968
8969               for (y=0; y < (ssize_t) image->rows; y++)
8970               {
8971                 if (logging != MagickFalse && y == 0)
8972                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8973                     "  pass %d, Image Is RGB, 16-bit GRAY, or GRAY_ALPHA",pass);
8974
8975                 p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
8976
8977                 if (p == (const PixelPacket *) NULL)
8978                   break;
8979
8980                 if (ping_color_type == PNG_COLOR_TYPE_GRAY)
8981                   (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8982                        quantum_info,GrayQuantum,ping_pixels,&image->exception);
8983
8984                 else if (ping_color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
8985                   {
8986                     if (logging != MagickFalse && y == 0)
8987                       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
8988                            "  Writing GRAY_ALPHA PNG pixels (4)");
8989
8990                     (void) ExportQuantumPixels(image,(const CacheView *) NULL,
8991                          quantum_info,GrayAlphaQuantum,ping_pixels,
8992                          &image->exception);
8993                   }
8994
8995                 else
8996                   {
8997                     /* TO DO:
8998                      *
8999                      * This is failing to account for 1, 2, 4-bit depths
9000                      * The call to png_set_packing() above is supposed to
9001                      * take care of those.
9002                      */
9003
9004                     /* GrayQuantum does not work here */
9005                     (void) ExportQuantumPixels(image,(const CacheView *) NULL,
9006                       quantum_info,IndexQuantum,ping_pixels,&image->exception);
9007
9008                     if (logging != MagickFalse && y <= 2)
9009                     {
9010                       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9011                           "  Writing row of pixels (4)");
9012
9013                       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9014                           "  ping_pixels[0]=%d,ping_pixels[1]=%d",
9015                           (int)ping_pixels[0],(int)ping_pixels[1]);
9016                     }
9017                   }
9018                 png_write_row(ping,ping_pixels);
9019               }
9020             }
9021
9022             if (image->previous == (Image *) NULL)
9023               {
9024                 status=SetImageProgress(image,LoadImageTag,pass,num_passes);
9025                 if (status == MagickFalse)
9026                   break;
9027               }
9028           }
9029         }
9030     }
9031
9032   if (quantum_info != (QuantumInfo *) NULL)
9033     quantum_info=DestroyQuantumInfo(quantum_info);
9034
9035   if (logging != MagickFalse)
9036     {
9037       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9038         "  Wrote PNG image data");
9039
9040       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9041         "    Width: %.20g",(double) ping_width);
9042
9043       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9044         "    Height: %.20g",(double) ping_height);
9045
9046       if (mng_info->write_png_depth)
9047         {
9048           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9049             "    Defined PNG:bit-depth: %d",mng_info->write_png_depth);
9050         }
9051
9052       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9053         "    PNG bit-depth written: %d",ping_bit_depth);
9054
9055       if (mng_info->write_png_colortype)
9056         {
9057           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9058             "    Defined PNG:color-type: %d",mng_info->write_png_colortype-1);
9059         }
9060
9061       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9062         "    PNG color-type written: %d",ping_color_type);
9063
9064       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9065         "    PNG Interlace method: %d",ping_interlace_method);
9066     }
9067   /*
9068     Generate text chunks.
9069   */
9070   if (ping_exclude_tEXt == MagickFalse && ping_exclude_zTXt == MagickFalse)
9071   {
9072     ResetImagePropertyIterator(image);
9073     property=GetNextImageProperty(image);
9074     while (property != (const char *) NULL)
9075     {
9076       png_textp
9077         text;
9078
9079       value=GetImageProperty(image,property);
9080       if (value != (const char *) NULL)
9081         {
9082           text=(png_textp) png_malloc(ping,(png_uint_32) sizeof(png_text));
9083           text[0].key=(char *) property;
9084           text[0].text=(char *) value;
9085           text[0].text_length=strlen(value);
9086
9087           if (ping_exclude_tEXt != MagickFalse)
9088              text[0].compression=PNG_TEXT_COMPRESSION_zTXt;
9089
9090           else if (ping_exclude_zTXt != MagickFalse)
9091              text[0].compression=PNG_TEXT_COMPRESSION_NONE;
9092
9093           else
9094           {
9095              text[0].compression=image_info->compression == NoCompression ||
9096                (image_info->compression == UndefinedCompression &&
9097                text[0].text_length < 128) ? PNG_TEXT_COMPRESSION_NONE :
9098                PNG_TEXT_COMPRESSION_zTXt ;
9099           }
9100
9101           if (logging != MagickFalse)
9102             {
9103               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9104                 "  Setting up text chunk");
9105
9106               (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9107                 "    keyword: %s",text[0].key);
9108             }
9109
9110           png_set_text(ping,ping_info,text,1);
9111           png_free(ping,text);
9112         }
9113       property=GetNextImageProperty(image);
9114     }
9115   }
9116
9117   /* write any PNG-chunk-e profiles */
9118   (void) Magick_png_write_chunk_from_profile(image,"PNG-chunk-e",logging);
9119
9120   if (logging != MagickFalse)
9121     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9122       "  Writing PNG end info");
9123
9124   png_write_end(ping,ping_info);
9125
9126   if (mng_info->need_fram && (int) image->dispose == BackgroundDispose)
9127     {
9128       if (mng_info->page.x || mng_info->page.y ||
9129           (ping_width != mng_info->page.width) ||
9130           (ping_height != mng_info->page.height))
9131         {
9132           unsigned char
9133             chunk[32];
9134
9135           /*
9136             Write FRAM 4 with clipping boundaries followed by FRAM 1.
9137           */
9138           (void) WriteBlobMSBULong(image,27L);  /* data length=27 */
9139           PNGType(chunk,mng_FRAM);
9140           LogPNGChunk(logging,mng_FRAM,27L);
9141           chunk[4]=4;
9142           chunk[5]=0;  /* frame name separator (no name) */
9143           chunk[6]=1;  /* flag for changing delay, for next frame only */
9144           chunk[7]=0;  /* flag for changing frame timeout */
9145           chunk[8]=1;  /* flag for changing frame clipping for next frame */
9146           chunk[9]=0;  /* flag for changing frame sync_id */
9147           PNGLong(chunk+10,(png_uint_32) (0L)); /* temporary 0 delay */
9148           chunk[14]=0; /* clipping boundaries delta type */
9149           PNGLong(chunk+15,(png_uint_32) (mng_info->page.x)); /* left cb */
9150           PNGLong(chunk+19,
9151              (png_uint_32) (mng_info->page.x + ping_width));
9152           PNGLong(chunk+23,(png_uint_32) (mng_info->page.y)); /* top cb */
9153           PNGLong(chunk+27,
9154              (png_uint_32) (mng_info->page.y + ping_height));
9155           (void) WriteBlob(image,31,chunk);
9156           (void) WriteBlobMSBULong(image,crc32(0,chunk,31));
9157           mng_info->old_framing_mode=4;
9158           mng_info->framing_mode=1;
9159         }
9160
9161       else
9162         mng_info->framing_mode=3;
9163     }
9164   if (mng_info->write_mng && !mng_info->need_fram &&
9165       ((int) image->dispose == 3))
9166      (void) ThrowMagickException(&image->exception,GetMagickModule(),
9167        CoderError,"Cannot convert GIF with disposal method 3 to MNG-LC",
9168        "`%s'",image->filename);
9169
9170   /*
9171     Free PNG resources.
9172   */
9173
9174   png_destroy_write_struct(&ping,&ping_info);
9175
9176   ping_pixels=(unsigned char *) RelinquishMagickMemory(ping_pixels);
9177
9178 #if defined(PNG_SETJMP_NOT_THREAD_SAFE)
9179   UnlockSemaphoreInfo(ping_semaphore);
9180 #endif
9181
9182   if (mng_info->need_blob != MagickFalse)
9183      (void) CloseBlob(image);
9184
9185   image_info=DestroyImageInfo(image_info);
9186   image=DestroyImage(image);
9187
9188   /* Store bit depth actually written */
9189   s[0]=(char) ping_bit_depth;
9190   s[1]='\0';
9191
9192   (void) SetImageProperty(IMimage,"png:bit-depth-written",s);
9193
9194   if (logging != MagickFalse)
9195     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9196       "  exit WriteOnePNGImage()");
9197
9198   return(MagickTrue);
9199 /*  End write one PNG image */
9200 }
9201
9202 /*
9203 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
9204 %                                                                             %
9205 %                                                                             %
9206 %                                                                             %
9207 %   W r i t e P N G I m a g e                                                 %
9208 %                                                                             %
9209 %                                                                             %
9210 %                                                                             %
9211 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
9212 %
9213 %  WritePNGImage() writes a Portable Network Graphics (PNG) or
9214 %  Multiple-image Network Graphics (MNG) image file.
9215 %
9216 %  MNG support written by Glenn Randers-Pehrson, glennrp@image...
9217 %
9218 %  The format of the WritePNGImage method is:
9219 %
9220 %      MagickBooleanType WritePNGImage(const ImageInfo *image_info,Image *image)
9221 %
9222 %  A description of each parameter follows:
9223 %
9224 %    o image_info: the image info.
9225 %
9226 %    o image:  The image.
9227 %
9228 %  Returns MagickTrue on success, MagickFalse on failure.
9229 %
9230 %  Communicating with the PNG encoder:
9231 %
9232 %  While the datastream written is always in PNG format and normally would
9233 %  be given the "png" file extension, this method also writes the following
9234 %  pseudo-formats which are subsets of PNG:
9235 %
9236 %    o PNG8:    An 8-bit indexed PNG datastream is written.  If transparency
9237 %               is present, the tRNS chunk must only have values 0 and 255
9238 %               (i.e., transparency is binary: fully opaque or fully
9239 %               transparent).  The pixels contain 8-bit indices even if
9240 %               they could be represented with 1, 2, or 4 bits. Note: grayscale
9241 %               images will be written as indexed PNG files even though the
9242 %               PNG grayscale type might be slightly more efficient.
9243 %
9244 %    o PNG24:   An 8-bit per sample RGB PNG datastream is written.  The tRNS
9245 %               chunk can be present to convey binary transparency by naming
9246 %               one of the colors as transparent.
9247 %
9248 %    o PNG32:   An 8-bit per sample RGBA PNG is written.  Partial
9249 %               transparency is permitted, i.e., the alpha sample for
9250 %               each pixel can have any value from 0 to 255. The alpha
9251 %               channel is present even if the image is fully opaque.
9252 %
9253 %    o -define: For more precise control of the PNG output, you can use the
9254 %               Image options "png:bit-depth" and "png:color-type".  These
9255 %               can be set from the commandline with "-define" and also
9256 %               from the application programming interfaces.  The options
9257 %               are case-independent and are converted to lowercase before
9258 %               being passed to this encoder.
9259 %
9260 %               png:color-type can be 0, 2, 3, 4, or 6.
9261 %
9262 %               When png:color-type is 0 (Grayscale), png:bit-depth can
9263 %               be 1, 2, 4, 8, or 16.
9264 %
9265 %               When png:color-type is 2 (RGB), png:bit-depth can
9266 %               be 8 or 16.
9267 %
9268 %               When png:color-type is 3 (Indexed), png:bit-depth can
9269 %               be 1, 2, 4, or 8.  This refers to the number of bits
9270 %               used to store the index.  The color samples always have
9271 %               bit-depth 8 in indexed PNG files.
9272 %
9273 %               When png:color-type is 4 (Gray-Matte) or 6 (RGB-Matte),
9274 %               png:bit-depth can be 8 or 16.
9275 %
9276 %  If the image cannot be written without loss in the requested PNG8, PNG24,
9277 %  or PNG32 format or with the requested bit-depth and color-type without loss,
9278 %  a PNG file will not be written, and the encoder will return MagickFalse.
9279 %  Since image encoders should not be responsible for the "heavy lifting",
9280 %  the user should make sure that ImageMagick has already reduced the
9281 %  image depth and number of colors and limit transparency to binary
9282 %  transparency prior to attempting to write the image in a format that
9283 %  is subject to depth, color, or transparency limitations.
9284 %
9285 %  TODO: Enforce the previous paragraph.
9286 %
9287 %  Note that another definition, "png:bit-depth-written" exists, but it
9288 %  is not intended for external use.  It is only used internally by the
9289 %  PNG encoder to inform the JNG encoder of the depth of the alpha channel.
9290 %
9291 %  It is possible to request that the PNG encoder write previously-formatted
9292 %  ancillary chunks in the output PNG file, using the "-profile" commandline
9293 %  option as shown below or by setting the profile via a programming
9294 %  interface:
9295 %
9296 %     -profile PNG-chunk-x:<file>
9297 %
9298 %  where x is a location flag and <file> is a file containing the chunk
9299 %  name in the first 4 bytes, then a colon (":"), followed by the chunk data.
9300 %  This encoder will compute the chunk length and CRC, so those must not
9301 %  be included in the file.
9302 %
9303 %  "x" can be "b" (before PLTE), "m" (middle, i.e., between PLTE and IDAT),
9304 %  or "e" (end, i.e., after IDAT).  If you want to write multiple chunks
9305 %  of the same type, then add a short unique string after the "x" to prevent
9306 %  subsequent profiles from overwriting the preceding ones, e.g.,
9307 %
9308 %     -profile PNG-chunk-b01:file01 -profile PNG-chunk-b02:file02
9309 %
9310 %  As of version 6.6.6 the following optimizations are always done:
9311 %
9312 %   o  32-bit depth is reduced to 16.
9313 %   o  16-bit depth is reduced to 8 if all pixels contain samples whose
9314 %      high byte and low byte are identical.
9315 %   o  Palette is sorted to remove unused entries and to put a
9316 %      transparent color first, if BUILD_PNG_PALETTE is defined.
9317 %   o  Opaque matte channel is removed when writing an indexed PNG.
9318 %   o  Grayscale images are reduced to 1, 2, or 4 bit depth if
9319 %      this can be done without loss and a larger bit depth N was not
9320 %      requested via the "-define PNG:bit-depth=N" option.
9321 %   o  If matte channel is present but only one transparent color is
9322 %      present, RGB+tRNS is written instead of RGBA
9323 %   o  Opaque matte channel is removed (or added, if color-type 4 or 6
9324 %      was requested when converting an opaque image).
9325 %
9326 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
9327 */
9328 static MagickBooleanType WritePNGImage(const ImageInfo *image_info,
9329   Image *image)
9330 {
9331   MagickBooleanType
9332     excluding,
9333     logging,
9334     have_mng_structure,
9335     status;
9336
9337   MngInfo
9338     *mng_info;
9339
9340   const char
9341     *value;
9342
9343   int
9344     i,
9345     source;
9346
9347   /*
9348     Open image file.
9349   */
9350   assert(image_info != (const ImageInfo *) NULL);
9351   assert(image_info->signature == MagickSignature);
9352   assert(image != (Image *) NULL);
9353   assert(image->signature == MagickSignature);
9354   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
9355   logging=LogMagickEvent(CoderEvent,GetMagickModule(),"enter WritePNGImage()");
9356   /*
9357     Allocate a MngInfo structure.
9358   */
9359   have_mng_structure=MagickFalse;
9360   mng_info=(MngInfo *) AcquireMagickMemory(sizeof(MngInfo));
9361
9362   if (mng_info == (MngInfo *) NULL)
9363     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
9364
9365   /*
9366     Initialize members of the MngInfo structure.
9367   */
9368   (void) ResetMagickMemory(mng_info,0,sizeof(MngInfo));
9369   mng_info->image=image;
9370   mng_info->equal_backgrounds=MagickTrue;
9371   have_mng_structure=MagickTrue;
9372
9373   /* See if user has requested a specific PNG subformat */
9374
9375   mng_info->write_png8=LocaleCompare(image_info->magick,"PNG8") == 0;
9376   mng_info->write_png24=LocaleCompare(image_info->magick,"PNG24") == 0;
9377   mng_info->write_png32=LocaleCompare(image_info->magick,"PNG32") == 0;
9378
9379   if (mng_info->write_png8)
9380     {
9381       mng_info->write_png_colortype = /* 3 */ 4;
9382       mng_info->write_png_depth = 8;
9383       image->depth = 8;
9384     }
9385
9386   if (mng_info->write_png24)
9387     {
9388       mng_info->write_png_colortype = /* 2 */ 3;
9389       mng_info->write_png_depth = 8;
9390       image->depth = 8;
9391
9392       if (image->matte == MagickTrue)
9393         (void) SetImageType(image,TrueColorMatteType);
9394
9395       else
9396         (void) SetImageType(image,TrueColorType);
9397
9398       (void) SyncImage(image);
9399     }
9400
9401   if (mng_info->write_png32)
9402     {
9403       mng_info->write_png_colortype = /* 6 */  7;
9404       mng_info->write_png_depth = 8;
9405       image->depth = 8;
9406
9407       if (image->matte == MagickTrue)
9408         (void) SetImageType(image,TrueColorMatteType);
9409
9410       else
9411         (void) SetImageType(image,TrueColorType);
9412
9413       (void) SyncImage(image);
9414     }
9415
9416   value=GetImageOption(image_info,"png:bit-depth");
9417
9418   if (value != (char *) NULL)
9419     {
9420       if (LocaleCompare(value,"1") == 0)
9421         mng_info->write_png_depth = 1;
9422
9423       else if (LocaleCompare(value,"2") == 0)
9424         mng_info->write_png_depth = 2;
9425
9426       else if (LocaleCompare(value,"4") == 0)
9427         mng_info->write_png_depth = 4;
9428
9429       else if (LocaleCompare(value,"8") == 0)
9430         mng_info->write_png_depth = 8;
9431
9432       else if (LocaleCompare(value,"16") == 0)
9433         mng_info->write_png_depth = 16;
9434
9435       else
9436         (void) ThrowMagickException(&image->exception,
9437              GetMagickModule(),CoderWarning,
9438              "ignoring invalid defined png:bit-depth",
9439              "=%s",value);
9440
9441       if (logging != MagickFalse)
9442         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9443           "  png:bit-depth=%d was defined.\n",mng_info->write_png_depth);
9444     }
9445
9446   value=GetImageOption(image_info,"png:color-type");
9447
9448   if (value != (char *) NULL)
9449     {
9450       /* We must store colortype+1 because 0 is a valid colortype */
9451       if (LocaleCompare(value,"0") == 0)
9452         mng_info->write_png_colortype = 1;
9453
9454       else if (LocaleCompare(value,"2") == 0)
9455         mng_info->write_png_colortype = 3;
9456
9457       else if (LocaleCompare(value,"3") == 0)
9458         mng_info->write_png_colortype = 4;
9459
9460       else if (LocaleCompare(value,"4") == 0)
9461         mng_info->write_png_colortype = 5;
9462
9463       else if (LocaleCompare(value,"6") == 0)
9464         mng_info->write_png_colortype = 7;
9465
9466       else
9467         (void) ThrowMagickException(&image->exception,
9468              GetMagickModule(),CoderWarning,
9469              "ignoring invalid defined png:color-type",
9470              "=%s",value);
9471
9472       if (logging != MagickFalse)
9473         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9474           "  png:color-type=%d was defined.\n",mng_info->write_png_colortype-1);
9475     }
9476
9477   /* Check for chunks to be excluded:
9478    *
9479    * The default is to not exclude any known chunks except for any
9480    * listed in the "unused_chunks" array, above.
9481    *
9482    * Chunks can be listed for exclusion via a "PNG:exclude-chunk"
9483    * define (in the image properties or in the image artifacts)
9484    * or via a mng_info member.  For convenience, in addition
9485    * to or instead of a comma-separated list of chunks, the
9486    * "exclude-chunk" string can be simply "all" or "none".
9487    *
9488    * The exclude-chunk define takes priority over the mng_info.
9489    *
9490    * A "PNG:include-chunk" define takes  priority over both the
9491    * mng_info and the "PNG:exclude-chunk" define.  Like the
9492    * "exclude-chunk" string, it can define "all" or "none" as
9493    * well as a comma-separated list.  Chunks that are unknown to
9494    * ImageMagick are always excluded, regardless of their "copy-safe"
9495    * status according to the PNG specification, and even if they
9496    * appear in the "include-chunk" list.
9497    *
9498    * Finally, all chunks listed in the "unused_chunks" array are
9499    * automatically excluded, regardless of the other instructions
9500    * or lack thereof.
9501    *
9502    * if you exclude sRGB but not gAMA (recommended), then sRGB chunk
9503    * will not be written and the gAMA chunk will only be written if it
9504    * is not between .45 and .46, or approximately (1.0/2.2).
9505    *
9506    * If you exclude tRNS and the image has transparency, the colortype
9507    * is forced to be 4 or 6 (GRAY_ALPHA or RGB_ALPHA).
9508    *
9509    * The -strip option causes StripImage() to set the png:include-chunk
9510    * artifact to "none,gama".
9511    */
9512
9513   mng_info->ping_exclude_bKGD=MagickFalse;
9514   mng_info->ping_exclude_cHRM=MagickFalse;
9515   mng_info->ping_exclude_EXIF=MagickFalse; /* hex-encoded EXIF in zTXt */
9516   mng_info->ping_exclude_gAMA=MagickFalse;
9517   mng_info->ping_exclude_cHRM=MagickFalse;
9518   mng_info->ping_exclude_iCCP=MagickFalse;
9519   /* mng_info->ping_exclude_iTXt=MagickFalse; */
9520   mng_info->ping_exclude_oFFs=MagickFalse;
9521   mng_info->ping_exclude_pHYs=MagickFalse;
9522   mng_info->ping_exclude_sRGB=MagickFalse;
9523   mng_info->ping_exclude_tEXt=MagickFalse;
9524   mng_info->ping_exclude_tRNS=MagickFalse;
9525   mng_info->ping_exclude_vpAg=MagickFalse;
9526   mng_info->ping_exclude_zCCP=MagickFalse; /* hex-encoded iCCP in zTXt */
9527   mng_info->ping_exclude_zTXt=MagickFalse;
9528
9529   excluding=MagickFalse;
9530
9531   for (source=0; source<1; source++)
9532   {
9533     if (source==0)
9534       {
9535        value=GetImageArtifact(image,"png:exclude-chunk");
9536
9537        if (value == NULL)
9538          value=GetImageArtifact(image,"png:exclude-chunks");
9539       }
9540     else
9541       {
9542        value=GetImageOption(image_info,"png:exclude-chunk");
9543
9544        if (value == NULL)
9545          value=GetImageOption(image_info,"png:exclude-chunks");
9546       }
9547
9548     if (value != NULL)
9549     {
9550
9551     size_t
9552       last;
9553
9554     excluding=MagickTrue;
9555
9556     if (logging != MagickFalse)
9557       {
9558         if (source == 0)
9559            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9560               "  png:exclude-chunk=%s found in image artifacts.\n", value);
9561         else
9562            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9563               "  png:exclude-chunk=%s found in image properties.\n", value);
9564       }
9565
9566     last=strlen(value);
9567
9568     for (i=0; i<(int) last; i+=5)
9569     {
9570
9571       if (LocaleNCompare(value+i,"all",3) == 0)
9572       {
9573         mng_info->ping_exclude_bKGD=MagickTrue;
9574         mng_info->ping_exclude_cHRM=MagickTrue;
9575         mng_info->ping_exclude_EXIF=MagickTrue;
9576         mng_info->ping_exclude_gAMA=MagickTrue;
9577         mng_info->ping_exclude_iCCP=MagickTrue;
9578         /* mng_info->ping_exclude_iTXt=MagickTrue; */
9579         mng_info->ping_exclude_oFFs=MagickTrue;
9580         mng_info->ping_exclude_pHYs=MagickTrue;
9581         mng_info->ping_exclude_sRGB=MagickTrue;
9582         mng_info->ping_exclude_tEXt=MagickTrue;
9583         mng_info->ping_exclude_tRNS=MagickTrue;
9584         mng_info->ping_exclude_vpAg=MagickTrue;
9585         mng_info->ping_exclude_zCCP=MagickTrue;
9586         mng_info->ping_exclude_zTXt=MagickTrue;
9587         i--;
9588       }
9589
9590       if (LocaleNCompare(value+i,"none",4) == 0)
9591       {
9592         mng_info->ping_exclude_bKGD=MagickFalse;
9593         mng_info->ping_exclude_cHRM=MagickFalse;
9594         mng_info->ping_exclude_EXIF=MagickFalse;
9595         mng_info->ping_exclude_gAMA=MagickFalse;
9596         mng_info->ping_exclude_iCCP=MagickFalse;
9597         /* mng_info->ping_exclude_iTXt=MagickFalse; */
9598         mng_info->ping_exclude_oFFs=MagickFalse;
9599         mng_info->ping_exclude_pHYs=MagickFalse;
9600         mng_info->ping_exclude_sRGB=MagickFalse;
9601         mng_info->ping_exclude_tEXt=MagickFalse;
9602         mng_info->ping_exclude_tRNS=MagickFalse;
9603         mng_info->ping_exclude_vpAg=MagickFalse;
9604         mng_info->ping_exclude_zCCP=MagickFalse;
9605         mng_info->ping_exclude_zTXt=MagickFalse;
9606       }
9607
9608       if (LocaleNCompare(value+i,"bkgd",4) == 0)
9609         mng_info->ping_exclude_bKGD=MagickTrue;
9610
9611       if (LocaleNCompare(value+i,"chrm",4) == 0)
9612         mng_info->ping_exclude_cHRM=MagickTrue;
9613
9614       if (LocaleNCompare(value+i,"exif",4) == 0)
9615         mng_info->ping_exclude_EXIF=MagickTrue;
9616
9617       if (LocaleNCompare(value+i,"gama",4) == 0)
9618         mng_info->ping_exclude_gAMA=MagickTrue;
9619
9620       if (LocaleNCompare(value+i,"iccp",4) == 0)
9621         mng_info->ping_exclude_iCCP=MagickTrue;
9622
9623     /*
9624       if (LocaleNCompare(value+i,"itxt",4) == 0)
9625         mng_info->ping_exclude_iTXt=MagickTrue;
9626      */
9627
9628       if (LocaleNCompare(value+i,"gama",4) == 0)
9629         mng_info->ping_exclude_gAMA=MagickTrue;
9630
9631       if (LocaleNCompare(value+i,"offs",4) == 0)
9632         mng_info->ping_exclude_oFFs=MagickTrue;
9633
9634       if (LocaleNCompare(value+i,"phys",4) == 0)
9635         mng_info->ping_exclude_pHYs=MagickTrue;
9636
9637       if (LocaleNCompare(value+i,"srgb",4) == 0)
9638         mng_info->ping_exclude_sRGB=MagickTrue;
9639
9640       if (LocaleNCompare(value+i,"text",4) == 0)
9641         mng_info->ping_exclude_tEXt=MagickTrue;
9642
9643       if (LocaleNCompare(value+i,"trns",4) == 0)
9644         mng_info->ping_exclude_tRNS=MagickTrue;
9645
9646       if (LocaleNCompare(value+i,"vpag",4) == 0)
9647         mng_info->ping_exclude_vpAg=MagickTrue;
9648
9649       if (LocaleNCompare(value+i,"zccp",4) == 0)
9650         mng_info->ping_exclude_zCCP=MagickTrue;
9651
9652       if (LocaleNCompare(value+i,"ztxt",4) == 0)
9653         mng_info->ping_exclude_zTXt=MagickTrue;
9654
9655       }
9656     }
9657   }
9658
9659   for (source=0; source<1; source++)
9660   {
9661     if (source==0)
9662       {
9663        value=GetImageArtifact(image,"png:include-chunk");
9664
9665        if (value == NULL)
9666          value=GetImageArtifact(image,"png:include-chunks");
9667       }
9668     else
9669       {
9670        value=GetImageOption(image_info,"png:include-chunk");
9671
9672        if (value == NULL)
9673          value=GetImageOption(image_info,"png:include-chunks");
9674       }
9675
9676     if (value != NULL)
9677     {
9678     size_t
9679       last;
9680
9681     excluding=MagickTrue;
9682
9683     if (logging != MagickFalse)
9684       {
9685         if (source == 0)
9686            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9687               "  png:include-chunk=%s found in image artifacts.\n", value);
9688         else
9689            (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9690               "  png:include-chunk=%s found in image properties.\n", value);
9691       }
9692
9693     last=strlen(value);
9694
9695     for (i=0; i<(int) last; i+=5)
9696       {
9697       if (LocaleNCompare(value+i,"all",3) == 0)
9698         {
9699           mng_info->ping_exclude_bKGD=MagickFalse;
9700           mng_info->ping_exclude_cHRM=MagickFalse;
9701           mng_info->ping_exclude_EXIF=MagickFalse;
9702           mng_info->ping_exclude_gAMA=MagickFalse;
9703           mng_info->ping_exclude_iCCP=MagickFalse;
9704           /* mng_info->ping_exclude_iTXt=MagickFalse; */
9705           mng_info->ping_exclude_oFFs=MagickFalse;
9706           mng_info->ping_exclude_pHYs=MagickFalse;
9707           mng_info->ping_exclude_sRGB=MagickFalse;
9708           mng_info->ping_exclude_tEXt=MagickFalse;
9709           mng_info->ping_exclude_tRNS=MagickFalse;
9710           mng_info->ping_exclude_vpAg=MagickFalse;
9711           mng_info->ping_exclude_zCCP=MagickFalse;
9712           mng_info->ping_exclude_zTXt=MagickFalse;
9713           i--;
9714         }
9715
9716       if (LocaleNCompare(value+i,"none",4) == 0)
9717         {
9718           mng_info->ping_exclude_bKGD=MagickTrue;
9719           mng_info->ping_exclude_cHRM=MagickTrue;
9720           mng_info->ping_exclude_EXIF=MagickTrue;
9721           mng_info->ping_exclude_gAMA=MagickTrue;
9722           mng_info->ping_exclude_iCCP=MagickTrue;
9723           /* mng_info->ping_exclude_iTXt=MagickTrue; */
9724           mng_info->ping_exclude_oFFs=MagickTrue;
9725           mng_info->ping_exclude_pHYs=MagickTrue;
9726           mng_info->ping_exclude_sRGB=MagickTrue;
9727           mng_info->ping_exclude_tEXt=MagickTrue;
9728           mng_info->ping_exclude_tRNS=MagickTrue;
9729           mng_info->ping_exclude_vpAg=MagickTrue;
9730           mng_info->ping_exclude_zCCP=MagickTrue;
9731           mng_info->ping_exclude_zTXt=MagickTrue;
9732         }
9733
9734       if (LocaleNCompare(value+i,"bkgd",4) == 0)
9735         mng_info->ping_exclude_bKGD=MagickFalse;
9736
9737       if (LocaleNCompare(value+i,"chrm",4) == 0)
9738         mng_info->ping_exclude_cHRM=MagickFalse;
9739
9740       if (LocaleNCompare(value+i,"exif",4) == 0)
9741         mng_info->ping_exclude_EXIF=MagickFalse;
9742
9743       if (LocaleNCompare(value+i,"gama",4) == 0)
9744         mng_info->ping_exclude_gAMA=MagickFalse;
9745
9746       if (LocaleNCompare(value+i,"iccp",4) == 0)
9747         mng_info->ping_exclude_iCCP=MagickFalse;
9748
9749     /*
9750       if (LocaleNCompare(value+i,"itxt",4) == 0)
9751         mng_info->ping_exclude_iTXt=MagickFalse;
9752      */
9753
9754       if (LocaleNCompare(value+i,"gama",4) == 0)
9755         mng_info->ping_exclude_gAMA=MagickFalse;
9756
9757       if (LocaleNCompare(value+i,"offs",4) == 0)
9758         mng_info->ping_exclude_oFFs=MagickFalse;
9759
9760       if (LocaleNCompare(value+i,"phys",4) == 0)
9761         mng_info->ping_exclude_pHYs=MagickFalse;
9762
9763       if (LocaleNCompare(value+i,"srgb",4) == 0)
9764         mng_info->ping_exclude_sRGB=MagickFalse;
9765
9766       if (LocaleNCompare(value+i,"text",4) == 0)
9767         mng_info->ping_exclude_tEXt=MagickFalse;
9768
9769       if (LocaleNCompare(value+i,"trns",4) == 0)
9770         mng_info->ping_exclude_tRNS=MagickFalse;
9771
9772       if (LocaleNCompare(value+i,"vpag",4) == 0)
9773         mng_info->ping_exclude_vpAg=MagickFalse;
9774
9775       if (LocaleNCompare(value+i,"zccp",4) == 0)
9776         mng_info->ping_exclude_zCCP=MagickFalse;
9777
9778       if (LocaleNCompare(value+i,"ztxt",4) == 0)
9779         mng_info->ping_exclude_zTXt=MagickFalse;
9780
9781       }
9782     }
9783   }
9784
9785   if (excluding != MagickFalse && logging != MagickFalse)
9786   {
9787     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9788       "  Chunks to be excluded from the output PNG:");
9789     if (mng_info->ping_exclude_bKGD != MagickFalse)
9790       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9791           "    bKGD");
9792     if (mng_info->ping_exclude_cHRM != MagickFalse)
9793       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9794           "    cHRM");
9795     if (mng_info->ping_exclude_EXIF != MagickFalse)
9796       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9797           "    EXIF");
9798     if (mng_info->ping_exclude_gAMA != MagickFalse)
9799       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9800           "    gAMA");
9801     if (mng_info->ping_exclude_iCCP != MagickFalse)
9802       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9803           "    iCCP");
9804 /*
9805     if (mng_info->ping_exclude_iTXt != MagickFalse)
9806       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9807           "    iTXt");
9808 */
9809     if (mng_info->ping_exclude_oFFs != MagickFalse)
9810       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9811           "    oFFs");
9812     if (mng_info->ping_exclude_pHYs != MagickFalse)
9813       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9814           "    pHYs");
9815     if (mng_info->ping_exclude_sRGB != MagickFalse)
9816       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9817           "    sRGB");
9818     if (mng_info->ping_exclude_tEXt != MagickFalse)
9819       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9820           "    tEXt");
9821     if (mng_info->ping_exclude_tRNS != MagickFalse)
9822       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9823           "    tRNS");
9824     if (mng_info->ping_exclude_vpAg != MagickFalse)
9825       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9826           "    vpAg");
9827     if (mng_info->ping_exclude_zCCP != MagickFalse)
9828       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9829           "    zCCP");
9830     if (mng_info->ping_exclude_zTXt != MagickFalse)
9831       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9832           "    zTXt");
9833   }
9834
9835   mng_info->need_blob = MagickTrue;
9836
9837   status=WriteOnePNGImage(mng_info,image_info,image);
9838
9839   MngInfoFreeStruct(mng_info,&have_mng_structure);
9840
9841   if (logging != MagickFalse)
9842     (void) LogMagickEvent(CoderEvent,GetMagickModule(),"exit WritePNGImage()");
9843
9844   return(status);
9845 }
9846
9847 #if defined(JNG_SUPPORTED)
9848
9849 /* Write one JNG image */
9850 static MagickBooleanType WriteOneJNGImage(MngInfo *mng_info,
9851    const ImageInfo *image_info,Image *image)
9852 {
9853   Image
9854     *jpeg_image;
9855
9856   ImageInfo
9857     *jpeg_image_info;
9858
9859   MagickBooleanType
9860     logging,
9861     status;
9862
9863   size_t
9864     length;
9865
9866   unsigned char
9867     *blob,
9868     chunk[80],
9869     *p;
9870
9871   unsigned int
9872     jng_alpha_compression_method,
9873     jng_alpha_sample_depth,
9874     jng_color_type,
9875     transparent;
9876
9877   size_t
9878     jng_quality;
9879
9880   logging=LogMagickEvent(CoderEvent,GetMagickModule(),
9881     "  enter WriteOneJNGImage()");
9882
9883   blob=(unsigned char *) NULL;
9884   jpeg_image=(Image *) NULL;
9885   jpeg_image_info=(ImageInfo *) NULL;
9886
9887   status=MagickTrue;
9888   transparent=image_info->type==GrayscaleMatteType ||
9889      image_info->type==TrueColorMatteType;
9890   jng_color_type=10;
9891   jng_alpha_sample_depth=0;
9892   jng_quality=image_info->quality == 0UL ? 75UL : image_info->quality;
9893   jng_alpha_compression_method=0;
9894
9895   if (image->matte != MagickFalse)
9896     {
9897       /* if any pixels are transparent */
9898       transparent=MagickTrue;
9899       if (image_info->compression==JPEGCompression)
9900         jng_alpha_compression_method=8;
9901     }
9902
9903   if (transparent)
9904     {
9905       jng_color_type=14;
9906
9907       /* Create JPEG blob, image, and image_info */
9908       if (logging != MagickFalse)
9909         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9910           "  Creating jpeg_image_info for opacity.");
9911
9912       jpeg_image_info=(ImageInfo *) CloneImageInfo(image_info);
9913
9914       if (jpeg_image_info == (ImageInfo *) NULL)
9915         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
9916
9917       if (logging != MagickFalse)
9918         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9919           "  Creating jpeg_image.");
9920
9921       jpeg_image=CloneImage(image,0,0,MagickTrue,&image->exception);
9922
9923       if (jpeg_image == (Image *) NULL)
9924         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
9925
9926       (void) CopyMagickString(jpeg_image->magick,"JPEG",MaxTextExtent);
9927       status=SeparateImageChannel(jpeg_image,OpacityChannel);
9928       status=NegateImage(jpeg_image,MagickFalse);
9929       jpeg_image->matte=MagickFalse;
9930
9931       if (jng_quality >= 1000)
9932         jpeg_image_info->quality=jng_quality/1000;
9933
9934       else
9935         jpeg_image_info->quality=jng_quality;
9936
9937       jpeg_image_info->type=GrayscaleType;
9938       (void) SetImageType(jpeg_image,GrayscaleType);
9939       (void) AcquireUniqueFilename(jpeg_image->filename);
9940       (void) FormatMagickString(jpeg_image_info->filename,MaxTextExtent,
9941         "%s",jpeg_image->filename);
9942     }
9943
9944   /* To do: check bit depth of PNG alpha channel */
9945
9946   /* Check if image is grayscale. */
9947   if (image_info->type != TrueColorMatteType && image_info->type !=
9948     TrueColorType && ImageIsGray(image))
9949     jng_color_type-=2;
9950
9951   if (transparent)
9952     {
9953       if (jng_alpha_compression_method==0)
9954         {
9955           const char
9956             *value;
9957
9958           /* Encode opacity as a grayscale PNG blob */
9959           status=OpenBlob(jpeg_image_info,jpeg_image,WriteBinaryBlobMode,
9960             &image->exception);
9961           if (logging != MagickFalse)
9962             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9963               "  Creating PNG blob.");
9964           length=0;
9965
9966           (void) CopyMagickString(jpeg_image_info->magick,"PNG",MaxTextExtent);
9967           (void) CopyMagickString(jpeg_image->magick,"PNG",MaxTextExtent);
9968           jpeg_image_info->interlace=NoInterlace;
9969
9970           blob=ImageToBlob(jpeg_image_info,jpeg_image,&length,
9971             &image->exception);
9972
9973           /* Retrieve sample depth used */
9974           value=GetImageProperty(jpeg_image,"png:bit-depth-written");
9975           if (value != (char *) NULL)
9976             jng_alpha_sample_depth= (unsigned int) value[0];
9977         }
9978       else
9979         {
9980           /* Encode opacity as a grayscale JPEG blob */
9981
9982           status=OpenBlob(jpeg_image_info,jpeg_image,WriteBinaryBlobMode,
9983             &image->exception);
9984
9985           (void) CopyMagickString(jpeg_image_info->magick,"JPEG",MaxTextExtent);
9986           (void) CopyMagickString(jpeg_image->magick,"JPEG",MaxTextExtent);
9987           jpeg_image_info->interlace=NoInterlace;
9988           if (logging != MagickFalse)
9989             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9990               "  Creating blob.");
9991           blob=ImageToBlob(jpeg_image_info,jpeg_image,&length,
9992            &image->exception);
9993           jng_alpha_sample_depth=8;
9994
9995           if (logging != MagickFalse)
9996             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
9997               "  Successfully read jpeg_image into a blob, length=%.20g.",
9998               (double) length);
9999
10000         }
10001       /* Destroy JPEG image and image_info */
10002       jpeg_image=DestroyImage(jpeg_image);
10003       (void) RelinquishUniqueFileResource(jpeg_image_info->filename);
10004       jpeg_image_info=DestroyImageInfo(jpeg_image_info);
10005     }
10006
10007   /* Write JHDR chunk */
10008   (void) WriteBlobMSBULong(image,16L);  /* chunk data length=16 */
10009   PNGType(chunk,mng_JHDR);
10010   LogPNGChunk(logging,mng_JHDR,16L);
10011   PNGLong(chunk+4,(png_uint_32) image->columns);
10012   PNGLong(chunk+8,(png_uint_32) image->rows);
10013   chunk[12]=jng_color_type;
10014   chunk[13]=8;  /* sample depth */
10015   chunk[14]=8; /*jng_image_compression_method */
10016   chunk[15]=(unsigned char) (image_info->interlace == NoInterlace ? 0 : 8);
10017   chunk[16]=jng_alpha_sample_depth;
10018   chunk[17]=jng_alpha_compression_method;
10019   chunk[18]=0; /*jng_alpha_filter_method */
10020   chunk[19]=0; /*jng_alpha_interlace_method */
10021   (void) WriteBlob(image,20,chunk);
10022   (void) WriteBlobMSBULong(image,crc32(0,chunk,20));
10023   if (logging != MagickFalse)
10024     {
10025       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10026         "    JNG width:%15lu",(unsigned long) image->columns);
10027
10028       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10029         "    JNG height:%14lu",(unsigned long) image->rows);
10030
10031       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10032         "    JNG color type:%10d",jng_color_type);
10033
10034       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10035         "    JNG sample depth:%8d",8);
10036
10037       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10038         "    JNG compression:%9d",8);
10039
10040       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10041         "    JNG interlace:%11d",0);
10042
10043       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10044         "    JNG alpha depth:%9d",jng_alpha_sample_depth);
10045
10046       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10047         "    JNG alpha compression:%3d",jng_alpha_compression_method);
10048
10049       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10050         "    JNG alpha filter:%8d",0);
10051
10052       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10053         "    JNG alpha interlace:%5d",0);
10054     }
10055
10056   /* Write any JNG-chunk-b profiles */
10057   (void) Magick_png_write_chunk_from_profile(image,"JNG-chunk-b",logging);
10058
10059   /*
10060      Write leading ancillary chunks
10061   */
10062
10063   if (transparent)
10064   {
10065     /*
10066       Write JNG bKGD chunk
10067     */
10068
10069     unsigned char
10070       blue,
10071       green,
10072       red;
10073
10074     ssize_t
10075       num_bytes;
10076
10077     if (jng_color_type == 8 || jng_color_type == 12)
10078       num_bytes=6L;
10079     else
10080       num_bytes=10L;
10081     (void) WriteBlobMSBULong(image,(size_t) (num_bytes-4L));
10082     PNGType(chunk,mng_bKGD);
10083     LogPNGChunk(logging,mng_bKGD,(size_t) (num_bytes-4L));
10084     red=ScaleQuantumToChar(image->background_color.red);
10085     green=ScaleQuantumToChar(image->background_color.green);
10086     blue=ScaleQuantumToChar(image->background_color.blue);
10087     *(chunk+4)=0;
10088     *(chunk+5)=red;
10089     *(chunk+6)=0;
10090     *(chunk+7)=green;
10091     *(chunk+8)=0;
10092     *(chunk+9)=blue;
10093     (void) WriteBlob(image,(size_t) num_bytes,chunk);
10094     (void) WriteBlobMSBULong(image,crc32(0,chunk,(uInt) num_bytes));
10095   }
10096
10097   if ((image->colorspace == sRGBColorspace || image->rendering_intent))
10098     {
10099       /*
10100         Write JNG sRGB chunk
10101       */
10102       (void) WriteBlobMSBULong(image,1L);
10103       PNGType(chunk,mng_sRGB);
10104       LogPNGChunk(logging,mng_sRGB,1L);
10105
10106       if (image->rendering_intent != UndefinedIntent)
10107         chunk[4]=(unsigned char)
10108           Magick_RenderingIntent_to_PNG_RenderingIntent(
10109           (image->rendering_intent));
10110
10111       else
10112         chunk[4]=(unsigned char)
10113           Magick_RenderingIntent_to_PNG_RenderingIntent(
10114           (PerceptualIntent));
10115
10116       (void) WriteBlob(image,5,chunk);
10117       (void) WriteBlobMSBULong(image,crc32(0,chunk,5));
10118     }
10119   else
10120     {
10121       if (image->gamma != 0.0)
10122         {
10123           /*
10124              Write JNG gAMA chunk
10125           */
10126           (void) WriteBlobMSBULong(image,4L);
10127           PNGType(chunk,mng_gAMA);
10128           LogPNGChunk(logging,mng_gAMA,4L);
10129           PNGLong(chunk+4,(png_uint_32) (100000*image->gamma+0.5));
10130           (void) WriteBlob(image,8,chunk);
10131           (void) WriteBlobMSBULong(image,crc32(0,chunk,8));
10132         }
10133
10134       if ((mng_info->equal_chrms == MagickFalse) &&
10135           (image->chromaticity.red_primary.x != 0.0))
10136         {
10137           PrimaryInfo
10138             primary;
10139
10140           /*
10141              Write JNG cHRM chunk
10142           */
10143           (void) WriteBlobMSBULong(image,32L);
10144           PNGType(chunk,mng_cHRM);
10145           LogPNGChunk(logging,mng_cHRM,32L);
10146           primary=image->chromaticity.white_point;
10147           PNGLong(chunk+4,(png_uint_32) (100000*primary.x+0.5));
10148           PNGLong(chunk+8,(png_uint_32) (100000*primary.y+0.5));
10149           primary=image->chromaticity.red_primary;
10150           PNGLong(chunk+12,(png_uint_32) (100000*primary.x+0.5));
10151           PNGLong(chunk+16,(png_uint_32) (100000*primary.y+0.5));
10152           primary=image->chromaticity.green_primary;
10153           PNGLong(chunk+20,(png_uint_32) (100000*primary.x+0.5));
10154           PNGLong(chunk+24,(png_uint_32) (100000*primary.y+0.5));
10155           primary=image->chromaticity.blue_primary;
10156           PNGLong(chunk+28,(png_uint_32) (100000*primary.x+0.5));
10157           PNGLong(chunk+32,(png_uint_32) (100000*primary.y+0.5));
10158           (void) WriteBlob(image,36,chunk);
10159           (void) WriteBlobMSBULong(image,crc32(0,chunk,36));
10160         }
10161     }
10162
10163   if (image->x_resolution && image->y_resolution && !mng_info->equal_physs)
10164     {
10165       /*
10166          Write JNG pHYs chunk
10167       */
10168       (void) WriteBlobMSBULong(image,9L);
10169       PNGType(chunk,mng_pHYs);
10170       LogPNGChunk(logging,mng_pHYs,9L);
10171       if (image->units == PixelsPerInchResolution)
10172         {
10173           PNGLong(chunk+4,(png_uint_32)
10174             (image->x_resolution*100.0/2.54+0.5));
10175
10176           PNGLong(chunk+8,(png_uint_32)
10177             (image->y_resolution*100.0/2.54+0.5));
10178
10179           chunk[12]=1;
10180         }
10181
10182       else
10183         {
10184           if (image->units == PixelsPerCentimeterResolution)
10185             {
10186               PNGLong(chunk+4,(png_uint_32)
10187                 (image->x_resolution*100.0+0.5));
10188
10189               PNGLong(chunk+8,(png_uint_32)
10190                 (image->y_resolution*100.0+0.5));
10191
10192               chunk[12]=1;
10193             }
10194
10195           else
10196             {
10197               PNGLong(chunk+4,(png_uint_32) (image->x_resolution+0.5));
10198               PNGLong(chunk+8,(png_uint_32) (image->y_resolution+0.5));
10199               chunk[12]=0;
10200             }
10201         }
10202       (void) WriteBlob(image,13,chunk);
10203       (void) WriteBlobMSBULong(image,crc32(0,chunk,13));
10204     }
10205
10206   if (mng_info->write_mng == 0 && (image->page.x || image->page.y))
10207     {
10208       /*
10209          Write JNG oFFs chunk
10210       */
10211       (void) WriteBlobMSBULong(image,9L);
10212       PNGType(chunk,mng_oFFs);
10213       LogPNGChunk(logging,mng_oFFs,9L);
10214       PNGsLong(chunk+4,(ssize_t) (image->page.x));
10215       PNGsLong(chunk+8,(ssize_t) (image->page.y));
10216       chunk[12]=0;
10217       (void) WriteBlob(image,13,chunk);
10218       (void) WriteBlobMSBULong(image,crc32(0,chunk,13));
10219     }
10220   if (mng_info->write_mng == 0 && (image->page.width || image->page.height))
10221     {
10222        (void) WriteBlobMSBULong(image,9L);  /* data length=8 */
10223        PNGType(chunk,mng_vpAg);
10224        LogPNGChunk(logging,mng_vpAg,9L);
10225        PNGLong(chunk+4,(png_uint_32) image->page.width);
10226        PNGLong(chunk+8,(png_uint_32) image->page.height);
10227        chunk[12]=0;   /* unit = pixels */
10228        (void) WriteBlob(image,13,chunk);
10229        (void) WriteBlobMSBULong(image,crc32(0,chunk,13));
10230     }
10231
10232
10233   if (transparent)
10234     {
10235       if (jng_alpha_compression_method==0)
10236         {
10237           register ssize_t
10238             i;
10239
10240           ssize_t
10241             len;
10242
10243           /* Write IDAT chunk header */
10244           if (logging != MagickFalse)
10245             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10246               "  Write IDAT chunks from blob, length=%.20g.",(double)
10247               length);
10248
10249           /* Copy IDAT chunks */
10250           len=0;
10251           p=blob+8;
10252           for (i=8; i<(ssize_t) length; i+=len+12)
10253           {
10254             len=(*p<<24)|((*(p+1))<<16)|((*(p+2))<<8)|(*(p+3));
10255             p+=4;
10256
10257             if (*(p)==73 && *(p+1)==68 && *(p+2)==65 && *(p+3)==84) /* IDAT */
10258               {
10259                 /* Found an IDAT chunk. */
10260                 (void) WriteBlobMSBULong(image,(size_t) len);
10261                 LogPNGChunk(logging,mng_IDAT,(size_t) len);
10262                 (void) WriteBlob(image,(size_t) len+4,p);
10263                 (void) WriteBlobMSBULong(image,
10264                     crc32(0,p,(uInt) len+4));
10265               }
10266
10267             else
10268               {
10269                 if (logging != MagickFalse)
10270                   (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10271                     "    Skipping %c%c%c%c chunk, length=%.20g.",
10272                     *(p),*(p+1),*(p+2),*(p+3),(double) len);
10273               }
10274             p+=(8+len);
10275           }
10276         }
10277       else
10278         {
10279           /* Write JDAA chunk header */
10280           if (logging != MagickFalse)
10281             (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10282               "  Write JDAA chunk, length=%.20g.",(double) length);
10283           (void) WriteBlobMSBULong(image,(size_t) length);
10284           PNGType(chunk,mng_JDAA);
10285           LogPNGChunk(logging,mng_JDAA,length);
10286           /* Write JDAT chunk(s) data */
10287           (void) WriteBlob(image,4,chunk);
10288           (void) WriteBlob(image,length,blob);
10289           (void) WriteBlobMSBULong(image,crc32(crc32(0,chunk,4),blob,
10290              (uInt) length));
10291         }
10292       blob=(unsigned char *) RelinquishMagickMemory(blob);
10293     }
10294
10295   /* Encode image as a JPEG blob */
10296   if (logging != MagickFalse)
10297     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10298       "  Creating jpeg_image_info.");
10299   jpeg_image_info=(ImageInfo *) CloneImageInfo(image_info);
10300   if (jpeg_image_info == (ImageInfo *) NULL)
10301     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
10302
10303   if (logging != MagickFalse)
10304     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10305       "  Creating jpeg_image.");
10306
10307   jpeg_image=CloneImage(image,0,0,MagickTrue,&image->exception);
10308   if (jpeg_image == (Image *) NULL)
10309     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
10310   (void) CopyMagickString(jpeg_image->magick,"JPEG",MaxTextExtent);
10311
10312   (void) AcquireUniqueFilename(jpeg_image->filename);
10313   (void) FormatMagickString(jpeg_image_info->filename,MaxTextExtent,"%s",
10314     jpeg_image->filename);
10315
10316   status=OpenBlob(jpeg_image_info,jpeg_image,WriteBinaryBlobMode,
10317     &image->exception);
10318
10319   if (logging != MagickFalse)
10320     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10321       "  Created jpeg_image, %.20g x %.20g.",(double) jpeg_image->columns,
10322       (double) jpeg_image->rows);
10323
10324   if (jng_color_type == 8 || jng_color_type == 12)
10325     jpeg_image_info->type=GrayscaleType;
10326
10327   jpeg_image_info->quality=jng_quality % 1000;
10328   (void) CopyMagickString(jpeg_image_info->magick,"JPEG",MaxTextExtent);
10329   (void) CopyMagickString(jpeg_image->magick,"JPEG",MaxTextExtent);
10330
10331   if (logging != MagickFalse)
10332     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10333       "  Creating blob.");
10334
10335   blob=ImageToBlob(jpeg_image_info,jpeg_image,&length,&image->exception);
10336
10337   if (logging != MagickFalse)
10338     {
10339       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10340         "  Successfully read jpeg_image into a blob, length=%.20g.",
10341         (double) length);
10342
10343       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10344         "  Write JDAT chunk, length=%.20g.",(double) length);
10345     }
10346
10347   /* Write JDAT chunk(s) */
10348   (void) WriteBlobMSBULong(image,(size_t) length);
10349   PNGType(chunk,mng_JDAT);
10350   LogPNGChunk(logging,mng_JDAT,length);
10351   (void) WriteBlob(image,4,chunk);
10352   (void) WriteBlob(image,length,blob);
10353   (void) WriteBlobMSBULong(image,crc32(crc32(0,chunk,4),blob,(uInt) length));
10354
10355   jpeg_image=DestroyImage(jpeg_image);
10356   (void) RelinquishUniqueFileResource(jpeg_image_info->filename);
10357   jpeg_image_info=DestroyImageInfo(jpeg_image_info);
10358   blob=(unsigned char *) RelinquishMagickMemory(blob);
10359
10360   /* Write any JNG-chunk-e profiles */
10361   (void) Magick_png_write_chunk_from_profile(image,"JNG-chunk-e",logging);
10362
10363   /* Write IEND chunk */
10364   (void) WriteBlobMSBULong(image,0L);
10365   PNGType(chunk,mng_IEND);
10366   LogPNGChunk(logging,mng_IEND,0);
10367   (void) WriteBlob(image,4,chunk);
10368   (void) WriteBlobMSBULong(image,crc32(0,chunk,4));
10369
10370   if (logging != MagickFalse)
10371     (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10372       "  exit WriteOneJNGImage()");
10373
10374   return(status);
10375 }
10376
10377
10378 /*
10379 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
10380 %                                                                             %
10381 %                                                                             %
10382 %                                                                             %
10383 %   W r i t e J N G I m a g e                                                 %
10384 %                                                                             %
10385 %                                                                             %
10386 %                                                                             %
10387 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
10388 %
10389 %  WriteJNGImage() writes a JPEG Network Graphics (JNG) image file.
10390 %
10391 %  JNG support written by Glenn Randers-Pehrson, glennrp@image...
10392 %
10393 %  The format of the WriteJNGImage method is:
10394 %
10395 %      MagickBooleanType WriteJNGImage(const ImageInfo *image_info,Image *image)
10396 %
10397 %  A description of each parameter follows:
10398 %
10399 %    o image_info: the image info.
10400 %
10401 %    o image:  The image.
10402 %
10403 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
10404 */
10405 static MagickBooleanType WriteJNGImage(const ImageInfo *image_info,Image *image)
10406 {
10407   MagickBooleanType
10408     have_mng_structure,
10409     logging,
10410     status;
10411
10412   MngInfo
10413     *mng_info;
10414
10415   /*
10416     Open image file.
10417   */
10418   assert(image_info != (const ImageInfo *) NULL);
10419   assert(image_info->signature == MagickSignature);
10420   assert(image != (Image *) NULL);
10421   assert(image->signature == MagickSignature);
10422   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
10423   logging=LogMagickEvent(CoderEvent,GetMagickModule(),"enter WriteJNGImage()");
10424   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
10425   if (status == MagickFalse)
10426     return(status);
10427
10428   /*
10429     Allocate a MngInfo structure.
10430   */
10431   have_mng_structure=MagickFalse;
10432   mng_info=(MngInfo *) AcquireMagickMemory(sizeof(MngInfo));
10433   if (mng_info == (MngInfo *) NULL)
10434     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
10435   /*
10436     Initialize members of the MngInfo structure.
10437   */
10438   (void) ResetMagickMemory(mng_info,0,sizeof(MngInfo));
10439   mng_info->image=image;
10440   have_mng_structure=MagickTrue;
10441
10442   (void) WriteBlob(image,8,(const unsigned char *) "\213JNG\r\n\032\n");
10443
10444   status=WriteOneJNGImage(mng_info,image_info,image);
10445   (void) CloseBlob(image);
10446
10447   (void) CatchImageException(image);
10448   MngInfoFreeStruct(mng_info,&have_mng_structure);
10449   if (logging != MagickFalse)
10450     (void) LogMagickEvent(CoderEvent,GetMagickModule(),"exit WriteJNGImage()");
10451   return(status);
10452 }
10453 #endif
10454
10455
10456
10457 static MagickBooleanType WriteMNGImage(const ImageInfo *image_info,Image *image)
10458 {
10459   const char
10460     *option;
10461
10462   Image
10463     *next_image;
10464
10465   MagickBooleanType
10466     have_mng_structure,
10467     status;
10468
10469   volatile MagickBooleanType
10470     logging;
10471
10472   MngInfo
10473     *mng_info;
10474
10475   int
10476     image_count,
10477     need_iterations,
10478     need_matte;
10479
10480   volatile int
10481 #if defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) || \
10482     defined(PNG_MNG_FEATURES_SUPPORTED)
10483     need_local_plte,
10484 #endif
10485     all_images_are_gray,
10486     need_defi,
10487     use_global_plte;
10488
10489   register ssize_t
10490     i;
10491
10492   unsigned char
10493     chunk[800];
10494
10495   volatile unsigned int
10496     write_jng,
10497     write_mng;
10498
10499   volatile size_t
10500     scene;
10501
10502   size_t
10503     final_delay=0,
10504     initial_delay;
10505
10506 #if (PNG_LIBPNG_VER < 10200)
10507     if (image_info->verbose)
10508       printf("Your PNG library (libpng-%s) is rather old.\n",
10509          PNG_LIBPNG_VER_STRING);
10510 #endif
10511
10512   /*
10513     Open image file.
10514   */
10515   assert(image_info != (const ImageInfo *) NULL);
10516   assert(image_info->signature == MagickSignature);
10517   assert(image != (Image *) NULL);
10518   assert(image->signature == MagickSignature);
10519   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
10520   logging=LogMagickEvent(CoderEvent,GetMagickModule(),"enter WriteMNGImage()");
10521   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
10522   if (status == MagickFalse)
10523     return(status);
10524
10525   /*
10526     Allocate a MngInfo structure.
10527   */
10528   have_mng_structure=MagickFalse;
10529   mng_info=(MngInfo *) AcquireMagickMemory(sizeof(MngInfo));
10530   if (mng_info == (MngInfo *) NULL)
10531     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
10532   /*
10533     Initialize members of the MngInfo structure.
10534   */
10535   (void) ResetMagickMemory(mng_info,0,sizeof(MngInfo));
10536   mng_info->image=image;
10537   have_mng_structure=MagickTrue;
10538   write_mng=LocaleCompare(image_info->magick,"MNG") == 0;
10539
10540   /*
10541    * See if user has requested a specific PNG subformat to be used
10542    * for all of the PNGs in the MNG being written, e.g.,
10543    *
10544    *    convert *.png png8:animation.mng
10545    *
10546    * To do: check -define png:bit_depth and png:color_type as well,
10547    * or perhaps use mng:bit_depth and mng:color_type instead for
10548    * global settings.
10549    */
10550
10551   mng_info->write_png8=LocaleCompare(image_info->magick,"PNG8") == 0;
10552   mng_info->write_png24=LocaleCompare(image_info->magick,"PNG24") == 0;
10553   mng_info->write_png32=LocaleCompare(image_info->magick,"PNG32") == 0;
10554
10555   write_jng=MagickFalse;
10556   if (image_info->compression == JPEGCompression)
10557     write_jng=MagickTrue;
10558
10559   mng_info->adjoin=image_info->adjoin &&
10560     (GetNextImageInList(image) != (Image *) NULL) && write_mng;
10561
10562   if (logging != MagickFalse)
10563     {
10564       /* Log some info about the input */
10565       Image
10566         *p;
10567
10568       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10569         "  Checking input image(s)");
10570
10571       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10572         "    Image_info depth: %.20g",(double) image_info->depth);
10573
10574       (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10575         "    Type: %d",image_info->type);
10576
10577       scene=0;
10578       for (p=image; p != (Image *) NULL; p=GetNextImageInList(p))
10579       {
10580         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10581           "    Scene: %.20g",(double) scene++);
10582
10583         (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10584           "      Image depth: %.20g",(double) p->depth);
10585
10586         if (p->matte)
10587           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10588             "      Matte: True");
10589
10590         else
10591           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10592             "      Matte: False");
10593
10594         if (p->storage_class == PseudoClass)
10595           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10596             "      Storage class: PseudoClass");
10597
10598         else
10599           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10600             "      Storage class: DirectClass");
10601
10602         if (p->colors)
10603           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10604             "      Number of colors: %.20g",(double) p->colors);
10605
10606         else
10607           (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10608             "      Number of colors: unspecified");
10609
10610         if (mng_info->adjoin == MagickFalse)
10611           break;
10612       }
10613     }
10614
10615   use_global_plte=MagickFalse;
10616   all_images_are_gray=MagickFalse;
10617 #ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED
10618   need_local_plte=MagickTrue;
10619 #endif
10620   need_defi=MagickFalse;
10621   need_matte=MagickFalse;
10622   mng_info->framing_mode=1;
10623   mng_info->old_framing_mode=1;
10624
10625   if (write_mng)
10626       if (image_info->page != (char *) NULL)
10627         {
10628           /*
10629             Determine image bounding box.
10630           */
10631           SetGeometry(image,&mng_info->page);
10632           (void) ParseMetaGeometry(image_info->page,&mng_info->page.x,
10633             &mng_info->page.y,&mng_info->page.width,&mng_info->page.height);
10634         }
10635   if (write_mng)
10636     {
10637       unsigned int
10638         need_geom;
10639
10640       unsigned short
10641         red,
10642         green,
10643         blue;
10644
10645       mng_info->page=image->page;
10646       need_geom=MagickTrue;
10647       if (mng_info->page.width || mng_info->page.height)
10648          need_geom=MagickFalse;
10649       /*
10650         Check all the scenes.
10651       */
10652       initial_delay=image->delay;
10653       need_iterations=MagickFalse;
10654       mng_info->equal_chrms=image->chromaticity.red_primary.x != 0.0;
10655       mng_info->equal_physs=MagickTrue,
10656       mng_info->equal_gammas=MagickTrue;
10657       mng_info->equal_srgbs=MagickTrue;
10658       mng_info->equal_backgrounds=MagickTrue;
10659       image_count=0;
10660 #if defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) || \
10661     defined(PNG_MNG_FEATURES_SUPPORTED)
10662       all_images_are_gray=MagickTrue;
10663       mng_info->equal_palettes=MagickFalse;
10664       need_local_plte=MagickFalse;
10665 #endif
10666       for (next_image=image; next_image != (Image *) NULL; )
10667       {
10668         if (need_geom)
10669           {
10670             if ((next_image->columns+next_image->page.x) > mng_info->page.width)
10671               mng_info->page.width=next_image->columns+next_image->page.x;
10672
10673             if ((next_image->rows+next_image->page.y) > mng_info->page.height)
10674               mng_info->page.height=next_image->rows+next_image->page.y;
10675           }
10676
10677         if (next_image->page.x || next_image->page.y)
10678           need_defi=MagickTrue;
10679
10680         if (next_image->matte)
10681           need_matte=MagickTrue;
10682
10683         if ((int) next_image->dispose >= BackgroundDispose)
10684           if (next_image->matte || next_image->page.x || next_image->page.y ||
10685               ((next_image->columns < mng_info->page.width) &&
10686                (next_image->rows < mng_info->page.height)))
10687             mng_info->need_fram=MagickTrue;
10688
10689         if (next_image->iterations)
10690           need_iterations=MagickTrue;
10691
10692         final_delay=next_image->delay;
10693
10694         if (final_delay != initial_delay || final_delay > 1UL*
10695            next_image->ticks_per_second)
10696           mng_info->need_fram=1;
10697
10698 #if defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) || \
10699     defined(PNG_MNG_FEATURES_SUPPORTED)
10700         /*
10701           check for global palette possibility.
10702         */
10703         if (image->matte != MagickFalse)
10704            need_local_plte=MagickTrue;
10705
10706         if (need_local_plte == 0)
10707           {
10708             if (ImageIsGray(image) == MagickFalse)
10709               all_images_are_gray=MagickFalse;
10710             mng_info->equal_palettes=PalettesAreEqual(image,next_image);
10711             if (use_global_plte == 0)
10712               use_global_plte=mng_info->equal_palettes;
10713             need_local_plte=!mng_info->equal_palettes;
10714           }
10715 #endif
10716         if (GetNextImageInList(next_image) != (Image *) NULL)
10717           {
10718             if (next_image->background_color.red !=
10719                 next_image->next->background_color.red ||
10720                 next_image->background_color.green !=
10721                 next_image->next->background_color.green ||
10722                 next_image->background_color.blue !=
10723                 next_image->next->background_color.blue)
10724               mng_info->equal_backgrounds=MagickFalse;
10725
10726             if (next_image->gamma != next_image->next->gamma)
10727               mng_info->equal_gammas=MagickFalse;
10728
10729             if (next_image->rendering_intent !=
10730                 next_image->next->rendering_intent)
10731               mng_info->equal_srgbs=MagickFalse;
10732
10733             if ((next_image->units != next_image->next->units) ||
10734                 (next_image->x_resolution != next_image->next->x_resolution) ||
10735                 (next_image->y_resolution != next_image->next->y_resolution))
10736               mng_info->equal_physs=MagickFalse;
10737
10738             if (mng_info->equal_chrms)
10739               {
10740                 if (next_image->chromaticity.red_primary.x !=
10741                     next_image->next->chromaticity.red_primary.x ||
10742                     next_image->chromaticity.red_primary.y !=
10743                     next_image->next->chromaticity.red_primary.y ||
10744                     next_image->chromaticity.green_primary.x !=
10745                     next_image->next->chromaticity.green_primary.x ||
10746                     next_image->chromaticity.green_primary.y !=
10747                     next_image->next->chromaticity.green_primary.y ||
10748                     next_image->chromaticity.blue_primary.x !=
10749                     next_image->next->chromaticity.blue_primary.x ||
10750                     next_image->chromaticity.blue_primary.y !=
10751                     next_image->next->chromaticity.blue_primary.y ||
10752                     next_image->chromaticity.white_point.x !=
10753                     next_image->next->chromaticity.white_point.x ||
10754                     next_image->chromaticity.white_point.y !=
10755                     next_image->next->chromaticity.white_point.y)
10756                   mng_info->equal_chrms=MagickFalse;
10757               }
10758           }
10759         image_count++;
10760         next_image=GetNextImageInList(next_image);
10761       }
10762       if (image_count < 2)
10763         {
10764           mng_info->equal_backgrounds=MagickFalse;
10765           mng_info->equal_chrms=MagickFalse;
10766           mng_info->equal_gammas=MagickFalse;
10767           mng_info->equal_srgbs=MagickFalse;
10768           mng_info->equal_physs=MagickFalse;
10769           use_global_plte=MagickFalse;
10770 #ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED
10771           need_local_plte=MagickTrue;
10772 #endif
10773           need_iterations=MagickFalse;
10774         }
10775
10776      if (mng_info->need_fram == MagickFalse)
10777        {
10778          /*
10779            Only certain framing rates 100/n are exactly representable without
10780            the FRAM chunk but we'll allow some slop in VLC files
10781          */
10782          if (final_delay == 0)
10783            {
10784              if (need_iterations != MagickFalse)
10785                {
10786                  /*
10787                    It's probably a GIF with loop; don't run it *too* fast.
10788                  */
10789                  if (mng_info->adjoin)
10790                    {
10791                      final_delay=10;
10792                      (void) ThrowMagickException(&image->exception,
10793                         GetMagickModule(),CoderWarning,
10794                        "input has zero delay between all frames; assuming",
10795                        " 10 cs `%s'","");
10796                    }
10797                }
10798              else
10799                mng_info->ticks_per_second=0;
10800            }
10801          if (final_delay != 0)
10802            mng_info->ticks_per_second=(png_uint_32)
10803               (image->ticks_per_second/final_delay);
10804          if (final_delay > 50)
10805            mng_info->ticks_per_second=2;
10806
10807          if (final_delay > 75)
10808            mng_info->ticks_per_second=1;
10809
10810          if (final_delay > 125)
10811            mng_info->need_fram=MagickTrue;
10812
10813          if (need_defi && final_delay > 2 && (final_delay != 4) &&
10814             (final_delay != 5) && (final_delay != 10) && (final_delay != 20) &&
10815             (final_delay != 25) && (final_delay != 50) && (final_delay !=
10816                1UL*image->ticks_per_second))
10817            mng_info->need_fram=MagickTrue;  /* make it exact; cannot be VLC */
10818        }
10819
10820      if (mng_info->need_fram != MagickFalse)
10821         mng_info->ticks_per_second=1UL*image->ticks_per_second;
10822      /*
10823         If pseudocolor, we should also check to see if all the
10824         palettes are identical and write a global PLTE if they are.
10825         ../glennrp Feb 99.
10826      */
10827      /*
10828         Write the MNG version 1.0 signature and MHDR chunk.
10829      */
10830      (void) WriteBlob(image,8,(const unsigned char *) "\212MNG\r\n\032\n");
10831      (void) WriteBlobMSBULong(image,28L);  /* chunk data length=28 */
10832      PNGType(chunk,mng_MHDR);
10833      LogPNGChunk(logging,mng_MHDR,28L);
10834      PNGLong(chunk+4,(png_uint_32) mng_info->page.width);
10835      PNGLong(chunk+8,(png_uint_32) mng_info->page.height);
10836      PNGLong(chunk+12,mng_info->ticks_per_second);
10837      PNGLong(chunk+16,0L);  /* layer count=unknown */
10838      PNGLong(chunk+20,0L);  /* frame count=unknown */
10839      PNGLong(chunk+24,0L);  /* play time=unknown   */
10840      if (write_jng)
10841        {
10842          if (need_matte)
10843            {
10844              if (need_defi || mng_info->need_fram || use_global_plte)
10845                PNGLong(chunk+28,27L);    /* simplicity=LC+JNG */
10846
10847              else
10848                PNGLong(chunk+28,25L);    /* simplicity=VLC+JNG */
10849            }
10850
10851          else
10852            {
10853              if (need_defi || mng_info->need_fram || use_global_plte)
10854                PNGLong(chunk+28,19L);  /* simplicity=LC+JNG, no transparency */
10855
10856              else
10857                PNGLong(chunk+28,17L);  /* simplicity=VLC+JNG, no transparency */
10858            }
10859        }
10860
10861      else
10862        {
10863          if (need_matte)
10864            {
10865              if (need_defi || mng_info->need_fram || use_global_plte)
10866                PNGLong(chunk+28,11L);    /* simplicity=LC */
10867
10868              else
10869                PNGLong(chunk+28,9L);    /* simplicity=VLC */
10870            }
10871
10872          else
10873            {
10874              if (need_defi || mng_info->need_fram || use_global_plte)
10875                PNGLong(chunk+28,3L);    /* simplicity=LC, no transparency */
10876
10877              else
10878                PNGLong(chunk+28,1L);    /* simplicity=VLC, no transparency */
10879            }
10880        }
10881      (void) WriteBlob(image,32,chunk);
10882      (void) WriteBlobMSBULong(image,crc32(0,chunk,32));
10883      option=GetImageOption(image_info,"mng:need-cacheoff");
10884      if (option != (const char *) NULL)
10885        {
10886          size_t
10887            length;
10888
10889          /*
10890            Write "nEED CACHEOFF" to turn playback caching off for streaming MNG.
10891          */
10892          PNGType(chunk,mng_nEED);
10893          length=CopyMagickString((char *) chunk+4,"CACHEOFF",20);
10894          (void) WriteBlobMSBULong(image,(size_t) length);
10895          LogPNGChunk(logging,mng_nEED,(size_t) length);
10896          length+=4;
10897          (void) WriteBlob(image,length,chunk);
10898          (void) WriteBlobMSBULong(image,crc32(0,chunk,(uInt) length));
10899        }
10900      if ((GetPreviousImageInList(image) == (Image *) NULL) &&
10901          (GetNextImageInList(image) != (Image *) NULL) &&
10902          (image->iterations != 1))
10903        {
10904          /*
10905            Write MNG TERM chunk
10906          */
10907          (void) WriteBlobMSBULong(image,10L);  /* data length=10 */
10908          PNGType(chunk,mng_TERM);
10909          LogPNGChunk(logging,mng_TERM,10L);
10910          chunk[4]=3;  /* repeat animation */
10911          chunk[5]=0;  /* show last frame when done */
10912          PNGLong(chunk+6,(png_uint_32) (mng_info->ticks_per_second*
10913             final_delay/MagickMax(image->ticks_per_second,1)));
10914
10915          if (image->iterations == 0)
10916            PNGLong(chunk+10,PNG_UINT_31_MAX);
10917
10918          else
10919            PNGLong(chunk+10,(png_uint_32) image->iterations);
10920
10921          if (logging != MagickFalse)
10922            {
10923              (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10924                "     TERM delay: %.20g",(double) (mng_info->ticks_per_second*
10925               final_delay/MagickMax(image->ticks_per_second,1)));
10926
10927              if (image->iterations == 0)
10928                (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10929                  "     TERM iterations: %.20g",(double) PNG_UINT_31_MAX);
10930
10931              else
10932                (void) LogMagickEvent(CoderEvent,GetMagickModule(),
10933                  "     Image iterations: %.20g",(double) image->iterations);
10934            }
10935          (void) WriteBlob(image,14,chunk);
10936          (void) WriteBlobMSBULong(image,crc32(0,chunk,14));
10937        }
10938      /*
10939        To do: check for cHRM+gAMA == sRGB, and write sRGB instead.
10940      */
10941      if ((image->colorspace == sRGBColorspace || image->rendering_intent) &&
10942           mng_info->equal_srgbs)
10943        {
10944          /*
10945            Write MNG sRGB chunk
10946          */
10947          (void) WriteBlobMSBULong(image,1L);
10948          PNGType(chunk,mng_sRGB);
10949          LogPNGChunk(logging,mng_sRGB,1L);
10950
10951          if (image->rendering_intent != UndefinedIntent)
10952            chunk[4]=(unsigned char)
10953              Magick_RenderingIntent_to_PNG_RenderingIntent(
10954              (image->rendering_intent));
10955
10956          else
10957            chunk[4]=(unsigned char)
10958              Magick_RenderingIntent_to_PNG_RenderingIntent(
10959                (PerceptualIntent));
10960
10961          (void) WriteBlob(image,5,chunk);
10962          (void) WriteBlobMSBULong(image,crc32(0,chunk,5));
10963          mng_info->have_write_global_srgb=MagickTrue;
10964        }
10965
10966      else
10967        {
10968          if (image->gamma && mng_info->equal_gammas)
10969            {
10970              /*
10971                 Write MNG gAMA chunk
10972              */
10973              (void) WriteBlobMSBULong(image,4L);
10974              PNGType(chunk,mng_gAMA);
10975              LogPNGChunk(logging,mng_gAMA,4L);
10976              PNGLong(chunk+4,(png_uint_32) (100000*image->gamma+0.5));
10977              (void) WriteBlob(image,8,chunk);
10978              (void) WriteBlobMSBULong(image,crc32(0,chunk,8));
10979              mng_info->have_write_global_gama=MagickTrue;
10980            }
10981          if (mng_info->equal_chrms)
10982            {
10983              PrimaryInfo
10984                primary;
10985
10986              /*
10987                 Write MNG cHRM chunk
10988              */
10989              (void) WriteBlobMSBULong(image,32L);
10990              PNGType(chunk,mng_cHRM);
10991              LogPNGChunk(logging,mng_cHRM,32L);
10992              primary=image->chromaticity.white_point;
10993              PNGLong(chunk+4,(png_uint_32) (100000*primary.x+0.5));
10994              PNGLong(chunk+8,(png_uint_32) (100000*primary.y+0.5));
10995              primary=image->chromaticity.red_primary;
10996              PNGLong(chunk+12,(png_uint_32) (100000*primary.x+0.5));
10997              PNGLong(chunk+16,(png_uint_32) (100000*primary.y+0.5));
10998              primary=image->chromaticity.green_primary;
10999              PNGLong(chunk+20,(png_uint_32) (100000*primary.x+0.5));
11000              PNGLong(chunk+24,(png_uint_32) (100000*primary.y+0.5));
11001              primary=image->chromaticity.blue_primary;
11002              PNGLong(chunk+28,(png_uint_32) (100000*primary.x+0.5));
11003              PNGLong(chunk+32,(png_uint_32) (100000*primary.y+0.5));
11004              (void) WriteBlob(image,36,chunk);
11005              (void) WriteBlobMSBULong(image,crc32(0,chunk,36));
11006              mng_info->have_write_global_chrm=MagickTrue;
11007            }
11008        }
11009      if (image->x_resolution && image->y_resolution && mng_info->equal_physs)
11010        {
11011          /*
11012             Write MNG pHYs chunk
11013          */
11014          (void) WriteBlobMSBULong(image,9L);
11015          PNGType(chunk,mng_pHYs);
11016          LogPNGChunk(logging,mng_pHYs,9L);
11017
11018          if (image->units == PixelsPerInchResolution)
11019            {
11020              PNGLong(chunk+4,(png_uint_32)
11021                (image->x_resolution*100.0/2.54+0.5));
11022
11023              PNGLong(chunk+8,(png_uint_32)
11024                (image->y_resolution*100.0/2.54+0.5));
11025
11026              chunk[12]=1;
11027            }
11028
11029          else
11030            {
11031              if (image->units == PixelsPerCentimeterResolution)
11032                {
11033                  PNGLong(chunk+4,(png_uint_32)
11034                    (image->x_resolution*100.0+0.5));
11035
11036                  PNGLong(chunk+8,(png_uint_32)
11037                    (image->y_resolution*100.0+0.5));
11038
11039                  chunk[12]=1;
11040                }
11041
11042              else
11043                {
11044                  PNGLong(chunk+4,(png_uint_32) (image->x_resolution+0.5));
11045                  PNGLong(chunk+8,(png_uint_32) (image->y_resolution+0.5));
11046                  chunk[12]=0;
11047                }
11048            }
11049          (void) WriteBlob(image,13,chunk);
11050          (void) WriteBlobMSBULong(image,crc32(0,chunk,13));
11051        }
11052      /*
11053        Write MNG BACK chunk and global bKGD chunk, if the image is transparent
11054        or does not cover the entire frame.
11055      */
11056      if (write_mng && (image->matte || image->page.x > 0 ||
11057          image->page.y > 0 || (image->page.width &&
11058          (image->page.width+image->page.x < mng_info->page.width))
11059          || (image->page.height && (image->page.height+image->page.y
11060          < mng_info->page.height))))
11061        {
11062          (void) WriteBlobMSBULong(image,6L);
11063          PNGType(chunk,mng_BACK);
11064          LogPNGChunk(logging,mng_BACK,6L);
11065          red=ScaleQuantumToShort(image->background_color.red);
11066          green=ScaleQuantumToShort(image->background_color.green);
11067          blue=ScaleQuantumToShort(image->background_color.blue);
11068          PNGShort(chunk+4,red);
11069          PNGShort(chunk+6,green);
11070          PNGShort(chunk+8,blue);
11071          (void) WriteBlob(image,10,chunk);
11072          (void) WriteBlobMSBULong(image,crc32(0,chunk,10));
11073          if (mng_info->equal_backgrounds)
11074            {
11075              (void) WriteBlobMSBULong(image,6L);
11076              PNGType(chunk,mng_bKGD);
11077              LogPNGChunk(logging,mng_bKGD,6L);
11078              (void) WriteBlob(image,10,chunk);
11079              (void) WriteBlobMSBULong(image,crc32(0,chunk,10));
11080            }
11081        }
11082
11083 #ifdef PNG_WRITE_EMPTY_PLTE_SUPPORTED
11084      if ((need_local_plte == MagickFalse) &&
11085          (image->storage_class == PseudoClass) &&
11086          (all_images_are_gray == MagickFalse))
11087        {
11088          size_t
11089            data_length;
11090
11091          /*
11092            Write MNG PLTE chunk
11093          */
11094          data_length=3*image->colors;
11095          (void) WriteBlobMSBULong(image,data_length);
11096          PNGType(chunk,mng_PLTE);
11097          LogPNGChunk(logging,mng_PLTE,data_length);
11098
11099          for (i=0; i < (ssize_t) image->colors; i++)
11100          {
11101            chunk[4+i*3]=ScaleQuantumToChar(image->colormap[i].red) & 0xff;
11102            chunk[5+i*3]=ScaleQuantumToChar(image->colormap[i].green) & 0xff;
11103            chunk[6+i*3]=ScaleQuantumToChar(image->colormap[i].blue) & 0xff;
11104          }
11105
11106          (void) WriteBlob(image,data_length+4,chunk);
11107          (void) WriteBlobMSBULong(image,crc32(0,chunk,(uInt) (data_length+4)));
11108          mng_info->have_write_global_plte=MagickTrue;
11109        }
11110 #endif
11111     }
11112   scene=0;
11113   mng_info->delay=0;
11114 #if defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) || \
11115     defined(PNG_MNG_FEATURES_SUPPORTED)
11116   mng_info->equal_palettes=MagickFalse;
11117 #endif
11118   do
11119   {
11120     if (mng_info->adjoin)
11121     {
11122 #if defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) || \
11123     defined(PNG_MNG_FEATURES_SUPPORTED)
11124     /*
11125       If we aren't using a global palette for the entire MNG, check to
11126       see if we can use one for two or more consecutive images.
11127     */
11128     if (need_local_plte && use_global_plte && !all_images_are_gray)
11129       {
11130         if (mng_info->IsPalette)
11131           {
11132             /*
11133               When equal_palettes is true, this image has the same palette
11134               as the previous PseudoClass image
11135             */
11136             mng_info->have_write_global_plte=mng_info->equal_palettes;
11137             mng_info->equal_palettes=PalettesAreEqual(image,image->next);
11138             if (mng_info->equal_palettes && !mng_info->have_write_global_plte)
11139               {
11140                 /*
11141                   Write MNG PLTE chunk
11142                 */
11143                 size_t
11144                   data_length;
11145
11146                 data_length=3*image->colors;
11147                 (void) WriteBlobMSBULong(image,data_length);
11148                 PNGType(chunk,mng_PLTE);
11149                 LogPNGChunk(logging,mng_PLTE,data_length);
11150
11151                 for (i=0; i < (ssize_t) image->colors; i++)
11152                 {
11153                   chunk[4+i*3]=ScaleQuantumToChar(image->colormap[i].red);
11154                   chunk[5+i*3]=ScaleQuantumToChar(image->colormap[i].green);
11155                   chunk[6+i*3]=ScaleQuantumToChar(image->colormap[i].blue);
11156                 }
11157
11158                 (void) WriteBlob(image,data_length+4,chunk);
11159                 (void) WriteBlobMSBULong(image,crc32(0,chunk,
11160                    (uInt) (data_length+4)));
11161                 mng_info->have_write_global_plte=MagickTrue;
11162               }
11163           }
11164         else
11165           mng_info->have_write_global_plte=MagickFalse;
11166       }
11167 #endif
11168     if (need_defi)
11169       {
11170         ssize_t
11171           previous_x,
11172           previous_y;
11173
11174         if (scene)
11175           {
11176             previous_x=mng_info->page.x;
11177             previous_y=mng_info->page.y;
11178           }
11179         else
11180           {
11181             previous_x=0;
11182             previous_y=0;
11183           }
11184         mng_info->page=image->page;
11185         if ((mng_info->page.x !=  previous_x) ||
11186             (mng_info->page.y != previous_y))
11187           {
11188              (void) WriteBlobMSBULong(image,12L);  /* data length=12 */
11189              PNGType(chunk,mng_DEFI);
11190              LogPNGChunk(logging,mng_DEFI,12L);
11191              chunk[4]=0; /* object 0 MSB */
11192              chunk[5]=0; /* object 0 LSB */
11193              chunk[6]=0; /* visible  */
11194              chunk[7]=0; /* abstract */
11195              PNGLong(chunk+8,(png_uint_32) mng_info->page.x);
11196              PNGLong(chunk+12,(png_uint_32) mng_info->page.y);
11197              (void) WriteBlob(image,16,chunk);
11198              (void) WriteBlobMSBULong(image,crc32(0,chunk,16));
11199           }
11200       }
11201     }
11202
11203    mng_info->write_mng=write_mng;
11204
11205    if ((int) image->dispose >= 3)
11206      mng_info->framing_mode=3;
11207
11208    if (mng_info->need_fram && mng_info->adjoin &&
11209        ((image->delay != mng_info->delay) ||
11210         (mng_info->framing_mode != mng_info->old_framing_mode)))
11211      {
11212        if (image->delay == mng_info->delay)
11213          {
11214            /*
11215              Write a MNG FRAM chunk with the new framing mode.
11216            */
11217            (void) WriteBlobMSBULong(image,1L);  /* data length=1 */
11218            PNGType(chunk,mng_FRAM);
11219            LogPNGChunk(logging,mng_FRAM,1L);
11220            chunk[4]=(unsigned char) mng_info->framing_mode;
11221            (void) WriteBlob(image,5,chunk);
11222            (void) WriteBlobMSBULong(image,crc32(0,chunk,5));
11223          }
11224        else
11225          {
11226            /*
11227              Write a MNG FRAM chunk with the delay.
11228            */
11229            (void) WriteBlobMSBULong(image,10L);  /* data length=10 */
11230            PNGType(chunk,mng_FRAM);
11231            LogPNGChunk(logging,mng_FRAM,10L);
11232            chunk[4]=(unsigned char) mng_info->framing_mode;
11233            chunk[5]=0;  /* frame name separator (no name) */
11234            chunk[6]=2;  /* flag for changing default delay */
11235            chunk[7]=0;  /* flag for changing frame timeout */
11236            chunk[8]=0;  /* flag for changing frame clipping */
11237            chunk[9]=0;  /* flag for changing frame sync_id */
11238            PNGLong(chunk+10,(png_uint_32)
11239              ((mng_info->ticks_per_second*
11240              image->delay)/MagickMax(image->ticks_per_second,1)));
11241            (void) WriteBlob(image,14,chunk);
11242            (void) WriteBlobMSBULong(image,crc32(0,chunk,14));
11243            mng_info->delay=(png_uint_32) image->delay;
11244          }
11245        mng_info->old_framing_mode=mng_info->framing_mode;
11246      }
11247
11248 #if defined(JNG_SUPPORTED)
11249    if (image_info->compression == JPEGCompression)
11250      {
11251        ImageInfo
11252          *write_info;
11253
11254        if (logging != MagickFalse)
11255          (void) LogMagickEvent(CoderEvent,GetMagickModule(),
11256            "  Writing JNG object.");
11257        /* To do: specify the desired alpha compression method. */
11258        write_info=CloneImageInfo(image_info);
11259        write_info->compression=UndefinedCompression;
11260        status=WriteOneJNGImage(mng_info,write_info,image);
11261        write_info=DestroyImageInfo(write_info);
11262      }
11263    else
11264 #endif
11265      {
11266        if (logging != MagickFalse)
11267          (void) LogMagickEvent(CoderEvent,GetMagickModule(),
11268            "  Writing PNG object.");
11269
11270        mng_info->need_blob = MagickFalse;
11271
11272        /* We don't want any ancillary chunks written */
11273        mng_info->ping_exclude_bKGD=MagickTrue;
11274        mng_info->ping_exclude_cHRM=MagickTrue;
11275        mng_info->ping_exclude_EXIF=MagickTrue;
11276        mng_info->ping_exclude_gAMA=MagickTrue;
11277        mng_info->ping_exclude_cHRM=MagickTrue;
11278        mng_info->ping_exclude_iCCP=MagickTrue;
11279        /* mng_info->ping_exclude_iTXt=MagickTrue; */
11280        mng_info->ping_exclude_oFFs=MagickTrue;
11281        mng_info->ping_exclude_pHYs=MagickTrue;
11282        mng_info->ping_exclude_sRGB=MagickTrue;
11283        mng_info->ping_exclude_tEXt=MagickTrue;
11284        mng_info->ping_exclude_tRNS=MagickTrue;
11285        mng_info->ping_exclude_vpAg=MagickTrue;
11286        mng_info->ping_exclude_zCCP=MagickTrue;
11287        mng_info->ping_exclude_zTXt=MagickTrue;
11288
11289        status=WriteOnePNGImage(mng_info,image_info,image);
11290      }
11291
11292     if (status == MagickFalse)
11293       {
11294         MngInfoFreeStruct(mng_info,&have_mng_structure);
11295         (void) CloseBlob(image);
11296         return(MagickFalse);
11297       }
11298     (void) CatchImageException(image);
11299     if (GetNextImageInList(image) == (Image *) NULL)
11300       break;
11301     image=SyncNextImageInList(image);
11302     status=SetImageProgress(image,SaveImagesTag,scene++,
11303       GetImageListLength(image));
11304
11305     if (status == MagickFalse)
11306       break;
11307
11308   } while (mng_info->adjoin);
11309
11310   if (write_mng)
11311     {
11312       while (GetPreviousImageInList(image) != (Image *) NULL)
11313         image=GetPreviousImageInList(image);
11314       /*
11315         Write the MEND chunk.
11316       */
11317       (void) WriteBlobMSBULong(image,0x00000000L);
11318       PNGType(chunk,mng_MEND);
11319       LogPNGChunk(logging,mng_MEND,0L);
11320       (void) WriteBlob(image,4,chunk);
11321       (void) WriteBlobMSBULong(image,crc32(0,chunk,4));
11322     }
11323   /*
11324     Relinquish resources.
11325   */
11326   (void) CloseBlob(image);
11327   MngInfoFreeStruct(mng_info,&have_mng_structure);
11328
11329   if (logging != MagickFalse)
11330     (void) LogMagickEvent(CoderEvent,GetMagickModule(),"exit WriteMNGImage()");
11331
11332   return(MagickTrue);
11333 }
11334 #else /* PNG_LIBPNG_VER > 10011 */
11335
11336 static MagickBooleanType WritePNGImage(const ImageInfo *image_info,Image *image)
11337 {
11338   image=image;
11339   printf("Your PNG library is too old: You have libpng-%s\n",
11340      PNG_LIBPNG_VER_STRING);
11341
11342   ThrowBinaryException(CoderError,"PNG library is too old",
11343      image_info->filename);
11344 }
11345
11346 static MagickBooleanType WriteMNGImage(const ImageInfo *image_info,Image *image)
11347 {
11348   return(WritePNGImage(image_info,image));
11349 }
11350 #endif /* PNG_LIBPNG_VER > 10011 */
11351 #endif