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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            X   X   CCCC  FFFFF                              %
   7 %                             X X   C      F                                  %
   8 %                              X    C      FFF                                %
   9 %                             X X   C      F                                  %
  10 %                            X   X   CCCC  F                                  %
  11 %                                                                             %
  12 %                                                                             %
  13 %                        Read GIMP XCF Image Format                           %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                              Leonard Rosenthol                              %
  17 %                               November 2001                                 %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/blob.h"
  44 #include "MagickCore/blob-private.h"
  45 #include "MagickCore/cache.h"
  46 #include "MagickCore/color.h"
  47 #include "MagickCore/composite.h"
  48 #include "MagickCore/exception.h"
  49 #include "MagickCore/exception-private.h"
  50 #include "MagickCore/image.h"
  51 #include "MagickCore/image-private.h"
  52 #include "MagickCore/list.h"
  53 #include "MagickCore/magick.h"
  54 #include "MagickCore/memory_.h"
  55 #include "MagickCore/pixel.h"
  56 #include "MagickCore/pixel-accessor.h"
  57 #include "MagickCore/property.h"
  58 #include "MagickCore/quantize.h"
  59 #include "MagickCore/quantum-private.h"
  60 #include "MagickCore/static.h"
  61 #include "MagickCore/string_.h"
  62 #include "MagickCore/module.h"
  63 \f
  64 /*
  65   Typedef declarations.
  66 */
  67 typedef enum
  68 {
  69   GIMP_RGB,
  70   GIMP_GRAY,
  71   GIMP_INDEXED
  72 } GimpImageBaseType;
  73
  74 typedef enum
  75 {
  76   PROP_END                   =  0,
  77   PROP_COLORMAP              =  1,
  78   PROP_ACTIVE_LAYER          =  2,
  79   PROP_ACTIVE_CHANNEL        =  3,
  80   PROP_SELECTION             =  4,
  81   PROP_FLOATING_SELECTION    =  5,
  82   PROP_OPACITY               =  6,
  83   PROP_MODE                  =  7,
  84   PROP_VISIBLE               =  8,
  85   PROP_LINKED                =  9,
  86   PROP_PRESERVE_TRANSPARENCY = 10,
  87   PROP_APPLY_MASK            = 11,
  88   PROP_EDIT_MASK             = 12,
  89   PROP_SHOW_MASK             = 13,
  90   PROP_SHOW_MASKED           = 14,
  91   PROP_OFFSETS               = 15,
  92   PROP_COLOR                 = 16,
  93   PROP_COMPRESSION           = 17,
  94   PROP_GUIDES                = 18,
  95   PROP_RESOLUTION            = 19,
  96   PROP_TATTOO                = 20,
  97   PROP_PARASITES             = 21,
  98   PROP_UNIT                  = 22,
  99   PROP_PATHS                 = 23,
 100   PROP_USER_UNIT             = 24
 101 } PropType;
 102
 103 typedef enum
 104 {
 105   COMPRESS_NONE              =  0,
 106   COMPRESS_RLE               =  1,
 107   COMPRESS_ZLIB              =  2,  /* unused */
 108   COMPRESS_FRACTAL           =  3   /* unused */
 109 } XcfCompressionType;
 110
 111 typedef struct
 112 {
 113   size_t
 114     width,
 115     height,
 116     image_type,
 117     bytes_per_pixel;
 118
 119   int
 120     compression;
 121
 122   size_t
 123     file_size;
 124
 125   size_t
 126     number_layers;
 127 } XCFDocInfo;
 128
 129 typedef struct
 130 {
 131   char
 132     name[1024];
 133
 134   unsigned int
 135     active;
 136
 137   size_t
 138     width,
 139     height,
 140     type,
 141     alpha,
 142     visible,
 143     linked,
 144     preserve_trans,
 145     apply_mask,
 146     show_mask,
 147     edit_mask,
 148     floating_offset;
 149
 150   ssize_t
 151     offset_x,
 152     offset_y;
 153
 154   size_t
 155     mode,
 156     tattoo;
 157
 158   Image
 159     *image;
 160 } XCFLayerInfo;
 161
 162 #define TILE_WIDTH   64
 163 #define TILE_HEIGHT  64
 164
 165 typedef struct
 166 {
 167   unsigned char
 168     red,
 169     green,
 170     blue,
 171     alpha;
 172 } XCFPixelInfo;
 173 \f
 174 /*
 175 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 176 %                                                                             %
 177 %                                                                             %
 178 %                                                                             %
 179 %   I s X C F                                                                 %
 180 %                                                                             %
 181 %                                                                             %
 182 %                                                                             %
 183 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 184 %
 185 %  IsXCF() returns MagickTrue if the image format type, identified by the
 186 %  magick string, is XCF (GIMP native format).
 187 %
 188 %  The format of the IsXCF method is:
 189 %
 190 %      MagickBooleanType IsXCF(const unsigned char *magick,const size_t length)
 191 %
 192 %  A description of each parameter follows:
 193 %
 194 %    o magick: compare image format pattern against these bytes.
 195 %
 196 %    o length: Specifies the length of the magick string.
 197 %
 198 %
 199 */
 200 static MagickBooleanType IsXCF(const unsigned char *magick,const size_t length)
 201 {
 202   if (length < 8)
 203     return(MagickFalse);
 204   if (LocaleNCompare((char *) magick,"gimp xcf",8) == 0)
 205     return(MagickTrue);
 206   return(MagickFalse);
 207 }
 208 \f
 209 typedef enum
 210 {
 211   GIMP_NORMAL_MODE,
 212   GIMP_DISSOLVE_MODE,
 213   GIMP_BEHIND_MODE,
 214   GIMP_MULTIPLY_MODE,
 215   GIMP_SCREEN_MODE,
 216   GIMP_OVERLAY_MODE,
 217   GIMP_DIFFERENCE_MODE,
 218   GIMP_ADDITION_MODE,
 219   GIMP_SUBTRACT_MODE,
 220   GIMP_DARKEN_ONLY_MODE,
 221   GIMP_LIGHTEN_ONLY_MODE,
 222   GIMP_HUE_MODE,
 223   GIMP_SATURATION_MODE,
 224   GIMP_COLOR_MODE,
 225   GIMP_VALUE_MODE,
 226   GIMP_DIVIDE_MODE,
 227   GIMP_DODGE_MODE,
 228   GIMP_BURN_MODE,
 229   GIMP_HARDLIGHT_MODE
 230 } GimpLayerModeEffects;
 231
 232 /*
 233   Simple utility routine to convert between PSD blending modes and
 234   ImageMagick compositing operators
 235 */
 236 static CompositeOperator GIMPBlendModeToCompositeOperator(
 237   size_t blendMode)
 238 {
 239   switch ( blendMode )
 240   {
 241     case GIMP_NORMAL_MODE:       return(OverCompositeOp);
 242     case GIMP_DISSOLVE_MODE:     return(DissolveCompositeOp);
 243     case GIMP_MULTIPLY_MODE:     return(MultiplyCompositeOp);
 244     case GIMP_SCREEN_MODE:       return(ScreenCompositeOp);
 245     case GIMP_OVERLAY_MODE:      return(OverlayCompositeOp);
 246     case GIMP_DIFFERENCE_MODE:   return(DifferenceCompositeOp);
 247     case GIMP_ADDITION_MODE:     return(ModulusAddCompositeOp);
 248     case GIMP_SUBTRACT_MODE:     return(ModulusSubtractCompositeOp);
 249     case GIMP_DARKEN_ONLY_MODE:  return(DarkenCompositeOp);
 250     case GIMP_LIGHTEN_ONLY_MODE: return(LightenCompositeOp);
 251     case GIMP_HUE_MODE:          return(HueCompositeOp);
 252     case GIMP_SATURATION_MODE:   return(SaturateCompositeOp);
 253     case GIMP_COLOR_MODE:        return(ColorizeCompositeOp);
 254     case GIMP_DODGE_MODE:        return(ColorDodgeCompositeOp);
 255     case GIMP_BURN_MODE:         return(ColorBurnCompositeOp);
 256     case GIMP_HARDLIGHT_MODE:    return(HardLightCompositeOp);
 257     case GIMP_DIVIDE_MODE:       return(DivideDstCompositeOp);
 258     /* these are the ones we don't support...yet */
 259     case GIMP_BEHIND_MODE:       return(OverCompositeOp);
 260     case GIMP_VALUE_MODE:        return(OverCompositeOp);
 261     default:                     return(OverCompositeOp);
 262   }
 263 }
 264 \f
 265 /*
 266 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 267 %                                                                             %
 268 %                                                                             %
 269 %                                                                             %
 270 +   R e a d B l o b S t r i n g W i t h L o n g S i z e                       %
 271 %                                                                             %
 272 %                                                                             %
 273 %                                                                             %
 274 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 275 %
 276 %  ReadBlobStringWithLongSize reads characters from a blob or file
 277 %  starting with a ssize_t length byte and then characters to that length
 278 %
 279 %  The format of the ReadBlobStringWithLongSize method is:
 280 %
 281 %      char *ReadBlobStringWithLongSize(Image *image,char *string)
 282 %
 283 %  A description of each parameter follows:
 284 %
 285 %    o image: the image.
 286 %
 287 %    o string: the address of a character buffer.
 288 %
 289 */
 290
 291 static char *ReadBlobStringWithLongSize(Image *image,char *string,size_t max,
 292   ExceptionInfo *exception)
 293 {
 294   int
 295     c;
 296
 297   MagickOffsetType
 298     offset;
 299
 300   register ssize_t
 301     i;
 302
 303   size_t
 304     length;
 305
 306   assert(image != (Image *) NULL);
 307   assert(image->signature == MagickCoreSignature);
 308   assert(max != 0);
 309   if (image->debug != MagickFalse)
 310     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 311   length=ReadBlobMSBLong(image);
 312   for (i=0; i < (ssize_t) MagickMin(length,max-1); i++)
 313   {
 314     c=ReadBlobByte(image);
 315     if (c == EOF)
 316       return((char *) NULL);
 317     string[i]=(char) c;
 318   }
 319   string[i]='\0';
 320   offset=SeekBlob(image,(MagickOffsetType) (length-i),SEEK_CUR);
 321   if (offset < 0)
 322     (void) ThrowMagickException(exception,GetMagickModule(),
 323       CorruptImageError,"ImproperImageHeader","`%s'",image->filename);
 324   return(string);
 325 }
 326
 327 static MagickBooleanType load_tile(Image *image,Image *tile_image,
 328   XCFDocInfo *inDocInfo,XCFLayerInfo *inLayerInfo,size_t data_length,
 329   ExceptionInfo *exception)
 330 {
 331   ssize_t
 332     y;
 333
 334   register ssize_t
 335     x;
 336
 337   register Quantum
 338     *q;
 339
 340   size_t
 341     extent;
 342
 343   ssize_t
 344     count;
 345
 346   unsigned char
 347     *graydata;
 348
 349   XCFPixelInfo
 350     *xcfdata,
 351     *xcfodata;
 352
 353   extent=0;
 354   if (inDocInfo->image_type == GIMP_GRAY)
 355     extent=tile_image->columns*tile_image->rows*sizeof(*graydata);
 356   else
 357     if (inDocInfo->image_type == GIMP_RGB)
 358       extent=tile_image->columns*tile_image->rows*sizeof(*xcfdata);
 359   if (extent > data_length)
 360     ThrowBinaryException(CorruptImageError,"NotEnoughPixelData",
 361       image->filename);
 362   xcfdata=(XCFPixelInfo *) AcquireQuantumMemory(MagickMax(data_length,
 363     tile_image->columns*tile_image->rows),sizeof(*xcfdata));
 364   if (xcfdata == (XCFPixelInfo *) NULL)
 365     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 366       image->filename);
 367   xcfodata=xcfdata;
 368   graydata=(unsigned char *) xcfdata;  /* used by gray and indexed */
 369   count=ReadBlob(image,data_length,(unsigned char *) xcfdata);
 370   if (count != (ssize_t) data_length)
 371     ThrowBinaryException(CorruptImageError,"NotEnoughPixelData",
 372       image->filename);
 373   for (y=0; y < (ssize_t) tile_image->rows; y++)
 374   {
 375     q=GetAuthenticPixels(tile_image,0,y,tile_image->columns,1,exception);
 376     if (q == (Quantum *) NULL)
 377       break;
 378     if (inDocInfo->image_type == GIMP_GRAY)
 379       {
 380         for (x=0; x < (ssize_t) tile_image->columns; x++)
 381         {
 382           SetPixelGray(tile_image,ScaleCharToQuantum(*graydata),q);
 383           SetPixelAlpha(tile_image,ScaleCharToQuantum((unsigned char)
 384             inLayerInfo->alpha),q);
 385           graydata++;
 386           q+=GetPixelChannels(tile_image);
 387         }
 388       }
 389     else
 390       if (inDocInfo->image_type == GIMP_RGB)
 391         {
 392           for (x=0; x < (ssize_t) tile_image->columns; x++)
 393           {
 394             SetPixelRed(tile_image,ScaleCharToQuantum(xcfdata->red),q);
 395             SetPixelGreen(tile_image,ScaleCharToQuantum(xcfdata->green),q);
 396             SetPixelBlue(tile_image,ScaleCharToQuantum(xcfdata->blue),q);
 397             SetPixelAlpha(tile_image,xcfdata->alpha == 255U ? TransparentAlpha :
 398               ScaleCharToQuantum((unsigned char) inLayerInfo->alpha),q);
 399             xcfdata++;
 400             q+=GetPixelChannels(tile_image);
 401           }
 402         }
 403      if (SyncAuthenticPixels(tile_image,exception) == MagickFalse)
 404        break;
 405   }
 406   xcfodata=(XCFPixelInfo *) RelinquishMagickMemory(xcfodata);
 407   return MagickTrue;
 408 }
 409
 410 static MagickBooleanType load_tile_rle(Image *image,Image *tile_image,
 411   XCFDocInfo *inDocInfo,XCFLayerInfo *inLayerInfo,size_t data_length,
 412   ExceptionInfo *exception)
 413 {
 414   MagickOffsetType
 415     size;
 416
 417   Quantum
 418     alpha;
 419
 420   register Quantum
 421     *q;
 422
 423   size_t
 424     length;
 425
 426   ssize_t
 427     bytes_per_pixel,
 428     count,
 429     i,
 430     j;
 431
 432   unsigned char
 433     data,
 434     pixel,
 435     *xcfdata,
 436     *xcfodata,
 437     *xcfdatalimit;
 438
 439   bytes_per_pixel=(ssize_t) inDocInfo->bytes_per_pixel;
 440   xcfdata=(unsigned char *) AcquireQuantumMemory(data_length,sizeof(*xcfdata));
 441   if (xcfdata == (unsigned char *) NULL)
 442     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 443       image->filename);
 444   xcfodata=xcfdata;
 445   count=ReadBlob(image, (size_t) data_length, xcfdata);
 446   xcfdatalimit = xcfodata+count-1;
 447   alpha=ScaleCharToQuantum((unsigned char) inLayerInfo->alpha);
 448   for (i=0; i < (ssize_t) bytes_per_pixel; i++)
 449   {
 450     q=GetAuthenticPixels(tile_image,0,0,tile_image->columns,tile_image->rows,
 451       exception);
 452     if (q == (Quantum *) NULL)
 453       continue;
 454     size=(MagickOffsetType) tile_image->rows*tile_image->columns;
 455     while (size > 0)
 456     {
 457       if (xcfdata > xcfdatalimit)
 458         goto bogus_rle;
 459       pixel=(*xcfdata++);
 460       length=(size_t) pixel;
 461       if (length >= 128)
 462         {
 463           length=255-(length-1);
 464           if (length == 128)
 465             {
 466               if (xcfdata >= xcfdatalimit)
 467                 goto bogus_rle;
 468               length=(size_t) ((*xcfdata << 8) + xcfdata[1]);
 469               xcfdata+=2;
 470             }
 471           size-=length;
 472           if (size < 0)
 473             goto bogus_rle;
 474           if (&xcfdata[length-1] > xcfdatalimit)
 475             goto bogus_rle;
 476           while (length-- > 0)
 477           {
 478             data=(*xcfdata++);
 479             switch (i)
 480             {
 481               case 0:
 482               {
 483                 if (inDocInfo->image_type == GIMP_GRAY)
 484                   SetPixelGray(tile_image,ScaleCharToQuantum(data),q);
 485                 else
 486                   {
 487                     SetPixelRed(tile_image,ScaleCharToQuantum(data),q);
 488                     SetPixelGreen(tile_image,ScaleCharToQuantum(data),q);
 489                     SetPixelBlue(tile_image,ScaleCharToQuantum(data),q);
 490                   }
 491                 SetPixelAlpha(tile_image,alpha,q);
 492                 break;
 493               }
 494               case 1:
 495               {
 496                 if (inDocInfo->image_type == GIMP_GRAY)
 497                   SetPixelAlpha(tile_image,ScaleCharToQuantum(data),q);
 498                 else
 499                   SetPixelGreen(tile_image,ScaleCharToQuantum(data),q);
 500                 break;
 501               }
 502               case 2:
 503               {
 504                 SetPixelBlue(tile_image,ScaleCharToQuantum(data),q);
 505                 break;
 506               }
 507               case 3:
 508               {
 509                 SetPixelAlpha(tile_image,ScaleCharToQuantum(data),q);
 510                 break;
 511               }
 512             }
 513             q+=GetPixelChannels(tile_image);
 514           }
 515         }
 516       else
 517         {
 518           length+=1;
 519           if (length == 128)
 520             {
 521               if (xcfdata >= xcfdatalimit)
 522                 goto bogus_rle;
 523               length=(size_t) ((*xcfdata << 8) + xcfdata[1]);
 524               xcfdata+=2;
 525             }
 526           size-=length;
 527           if (size < 0)
 528             goto bogus_rle;
 529           if (xcfdata > xcfdatalimit)
 530             goto bogus_rle;
 531           pixel=(*xcfdata++);
 532           for (j=0; j < (ssize_t) length; j++)
 533           {
 534             data=pixel;
 535             switch (i)
 536             {
 537               case 0:
 538               {
 539                 if (inDocInfo->image_type == GIMP_GRAY)
 540                   SetPixelGray(tile_image,ScaleCharToQuantum(data),q);
 541                 else
 542                   {
 543                     SetPixelRed(tile_image,ScaleCharToQuantum(data),q);
 544                     SetPixelGreen(tile_image,ScaleCharToQuantum(data),q);
 545                     SetPixelBlue(tile_image,ScaleCharToQuantum(data),q);
 546                   }
 547                 SetPixelAlpha(tile_image,alpha,q);
 548                 break;
 549               }
 550               case 1:
 551               {
 552                 if (inDocInfo->image_type == GIMP_GRAY)
 553                   SetPixelAlpha(tile_image,ScaleCharToQuantum(data),q);
 554                 else
 555                   SetPixelGreen(tile_image,ScaleCharToQuantum(data),q);
 556                 break;
 557               }
 558               case 2:
 559               {
 560                 SetPixelBlue(tile_image,ScaleCharToQuantum(data),q);
 561                 break;
 562               }
 563               case 3:
 564               {
 565                 SetPixelAlpha(tile_image,ScaleCharToQuantum(data),q);
 566                 break;
 567               }
 568             }
 569             q+=GetPixelChannels(tile_image);
 570           }
 571         }
 572     }
 573     if (SyncAuthenticPixels(tile_image,exception) == MagickFalse)
 574       break;
 575   }
 576   xcfodata=(unsigned char *) RelinquishMagickMemory(xcfodata);
 577   return(MagickTrue);
 578
 579   bogus_rle:
 580     if (xcfodata != (unsigned char *) NULL)
 581       xcfodata=(unsigned char *) RelinquishMagickMemory(xcfodata);
 582   return(MagickFalse);
 583 }
 584
 585 static MagickBooleanType load_level(Image *image,XCFDocInfo *inDocInfo,
 586   XCFLayerInfo *inLayerInfo,ExceptionInfo *exception)
 587 {
 588   int
 589     destLeft = 0,
 590     destTop = 0;
 591
 592   Image*
 593     tile_image;
 594
 595   MagickBooleanType
 596     status;
 597
 598   MagickOffsetType
 599     saved_pos,
 600     offset,
 601     offset2;
 602
 603   register ssize_t
 604     i;
 605
 606   size_t
 607     width,
 608     height,
 609     ntiles,
 610     ntile_rows,
 611     ntile_cols,
 612     tile_image_width,
 613     tile_image_height;
 614
 615   /* start reading the data */
 616   width=ReadBlobMSBLong(image);
 617   height=ReadBlobMSBLong(image);
 618
 619   /* read in the first tile offset.
 620    *  if it is '0', then this tile level is empty
 621    *  and we can simply return.
 622    */
 623   offset=(MagickOffsetType) ReadBlobMSBLong(image);
 624   if (offset == 0)
 625     return(MagickTrue);
 626   /* Initialise the reference for the in-memory tile-compression
 627    */
 628   ntile_rows=(height+TILE_HEIGHT-1)/TILE_HEIGHT;
 629   ntile_cols=(width+TILE_WIDTH-1)/TILE_WIDTH;
 630   ntiles=ntile_rows*ntile_cols;
 631   for (i = 0; i < (ssize_t) ntiles; i++)
 632   {
 633     status=MagickFalse;
 634     if (offset == 0)
 635       ThrowBinaryException(CorruptImageError,"NotEnoughTiles",image->filename);
 636     /* save the current position as it is where the
 637      *  next tile offset is stored.
 638      */
 639     saved_pos=TellBlob(image);
 640     /* read in the offset of the next tile so we can calculate the amount
 641        of data needed for this tile*/
 642     offset2=(MagickOffsetType)ReadBlobMSBLong(image);
 643     /* if the offset is 0 then we need to read in the maximum possible
 644        allowing for negative compression */
 645     if (offset2 == 0)
 646       offset2=(MagickOffsetType) (offset + TILE_WIDTH * TILE_WIDTH * 4* 1.5);
 647     /* seek to the tile offset */
 648     offset=SeekBlob(image, offset, SEEK_SET);
 649
 650       /*
 651         Allocate the image for the tile.  NOTE: the last tile in a row or
 652         column may not be a full tile!
 653       */
 654       tile_image_width=(size_t) (destLeft == (int) ntile_cols-1 ?
 655         (int) width % TILE_WIDTH : TILE_WIDTH);
 656       if (tile_image_width == 0)
 657         tile_image_width=TILE_WIDTH;
 658       tile_image_height = (size_t) (destTop == (int) ntile_rows-1 ?
 659         (int) height % TILE_HEIGHT : TILE_HEIGHT);
 660       if (tile_image_height == 0)
 661         tile_image_height=TILE_HEIGHT;
 662       tile_image=CloneImage(inLayerInfo->image,tile_image_width,
 663         tile_image_height,MagickTrue,exception);
 664
 665       /* read in the tile */
 666       switch (inDocInfo->compression)
 667       {
 668         case COMPRESS_NONE:
 669           if (load_tile(image,tile_image,inDocInfo,inLayerInfo,(size_t) (offset2-offset),exception) == 0)
 670             status=MagickTrue;
 671           break;
 672         case COMPRESS_RLE:
 673           if (load_tile_rle (image,tile_image,inDocInfo,inLayerInfo,
 674               (int) (offset2-offset),exception) == 0)
 675             status=MagickTrue;
 676           break;
 677         case COMPRESS_ZLIB:
 678           ThrowBinaryException(CoderError,"ZipCompressNotSupported",
 679             image->filename)
 680         case COMPRESS_FRACTAL:
 681           ThrowBinaryException(CoderError,"FractalCompressNotSupported",
 682             image->filename)
 683       }
 684
 685       /* composite the tile onto the layer's image, and then destroy it */
 686       (void) CompositeImage(inLayerInfo->image,tile_image,CopyCompositeOp,
 687         MagickTrue,destLeft * TILE_WIDTH,destTop*TILE_HEIGHT,exception);
 688       tile_image=DestroyImage(tile_image);
 689
 690       /* adjust tile position */
 691       destLeft++;
 692       if (destLeft >= (int) ntile_cols)
 693         {
 694           destLeft = 0;
 695           destTop++;
 696         }
 697       if (status != MagickFalse)
 698         return(MagickFalse);
 699       /* restore the saved position so we'll be ready to
 700        *  read the next offset.
 701        */
 702       offset=SeekBlob(image, saved_pos, SEEK_SET);
 703       /* read in the offset of the next tile */
 704       offset=(MagickOffsetType) ReadBlobMSBLong(image);
 705     }
 706   if (offset != 0)
 707     ThrowBinaryException(CorruptImageError,"CorruptImage",image->filename)
 708   return(MagickTrue);
 709 }
 710
 711 static MagickBooleanType load_hierarchy(Image *image,XCFDocInfo *inDocInfo,
 712    XCFLayerInfo *inLayer, ExceptionInfo *exception)
 713 {
 714   MagickOffsetType
 715     saved_pos,
 716     offset,
 717     junk;
 718
 719   size_t
 720     width,
 721     height,
 722     bytes_per_pixel;
 723
 724   width=ReadBlobMSBLong(image);
 725   (void) width;
 726   height=ReadBlobMSBLong(image);
 727   (void) height;
 728   bytes_per_pixel=inDocInfo->bytes_per_pixel=ReadBlobMSBLong(image);
 729   (void) bytes_per_pixel;
 730
 731   /* load in the levels...we make sure that the number of levels
 732    *  calculated when the TileManager was created is the same
 733    *  as the number of levels found in the file.
 734    */
 735   offset=(MagickOffsetType) ReadBlobMSBLong(image);  /* top level */
 736
 737   /* discard offsets for layers below first, if any.
 738    */
 739   do
 740   {
 741     junk=(MagickOffsetType) ReadBlobMSBLong(image);
 742   }
 743   while (junk != 0);
 744
 745   /* save the current position as it is where the
 746    *  next level offset is stored.
 747    */
 748   saved_pos=TellBlob(image);
 749
 750   /* seek to the level offset */
 751   offset=SeekBlob(image, offset, SEEK_SET);
 752
 753   /* read in the level */
 754   if (load_level (image, inDocInfo, inLayer, exception) == 0)
 755     return(MagickFalse);
 756   /* restore the saved position so we'll be ready to
 757    *  read the next offset.
 758    */
 759   offset=SeekBlob(image, saved_pos, SEEK_SET);
 760   return(MagickTrue);
 761 }
 762
 763 static void InitXCFImage(XCFLayerInfo *outLayer,ExceptionInfo *exception)
 764 {
 765   outLayer->image->page.x=outLayer->offset_x;
 766   outLayer->image->page.y=outLayer->offset_y;
 767   outLayer->image->page.width=outLayer->width;
 768   outLayer->image->page.height=outLayer->height;
 769   (void) SetImageProperty(outLayer->image,"label",(char *)outLayer->name,
 770     exception);
 771 }
 772
 773 static MagickBooleanType ReadOneLayer(const ImageInfo *image_info,Image* image,
 774   XCFDocInfo* inDocInfo,XCFLayerInfo *outLayer,const ssize_t layer,
 775   ExceptionInfo *exception)
 776 {
 777   MagickOffsetType
 778     offset;
 779
 780   unsigned int
 781     foundPropEnd = 0;
 782
 783   size_t
 784     hierarchy_offset,
 785     layer_mask_offset;
 786
 787   /* clear the block! */
 788   (void) ResetMagickMemory( outLayer, 0, sizeof( XCFLayerInfo ) );
 789   /* read in the layer width, height, type and name */
 790   outLayer->width = ReadBlobMSBLong(image);
 791   outLayer->height = ReadBlobMSBLong(image);
 792   outLayer->type = ReadBlobMSBLong(image);
 793   (void) ReadBlobStringWithLongSize(image, outLayer->name,
 794     sizeof(outLayer->name),exception);
 795   /* read the layer properties! */
 796   foundPropEnd = 0;
 797   while ( (foundPropEnd == MagickFalse) && (EOFBlob(image) == MagickFalse) ) {
 798   PropType    prop_type = (PropType) ReadBlobMSBLong(image);
 799   size_t  prop_size = ReadBlobMSBLong(image);
 800     switch (prop_type)
 801     {
 802     case PROP_END:
 803       foundPropEnd = 1;
 804       break;
 805     case PROP_ACTIVE_LAYER:
 806       outLayer->active = 1;
 807       break;
 808     case PROP_FLOATING_SELECTION:
 809       outLayer->floating_offset = ReadBlobMSBLong(image);
 810       break;
 811     case PROP_OPACITY:
 812       outLayer->alpha = ReadBlobMSBLong(image);
 813       break;
 814     case PROP_VISIBLE:
 815       outLayer->visible = ReadBlobMSBLong(image);
 816       break;
 817     case PROP_LINKED:
 818       outLayer->linked = ReadBlobMSBLong(image);
 819       break;
 820     case PROP_PRESERVE_TRANSPARENCY:
 821       outLayer->preserve_trans = ReadBlobMSBLong(image);
 822       break;
 823     case PROP_APPLY_MASK:
 824       outLayer->apply_mask = ReadBlobMSBLong(image);
 825       break;
 826     case PROP_EDIT_MASK:
 827       outLayer->edit_mask = ReadBlobMSBLong(image);
 828       break;
 829     case PROP_SHOW_MASK:
 830       outLayer->show_mask = ReadBlobMSBLong(image);
 831       break;
 832     case PROP_OFFSETS:
 833       outLayer->offset_x = (int) ReadBlobMSBLong(image);
 834       outLayer->offset_y = (int) ReadBlobMSBLong(image);
 835       break;
 836     case PROP_MODE:
 837       outLayer->mode = ReadBlobMSBLong(image);
 838       break;
 839     case PROP_TATTOO:
 840       outLayer->preserve_trans = ReadBlobMSBLong(image);
 841       break;
 842      case PROP_PARASITES:
 843      {
 844        if (DiscardBlobBytes(image,prop_size) == MagickFalse)
 845          ThrowFileException(exception,CorruptImageError,
 846            "UnexpectedEndOfFile",image->filename);
 847
 848         /*
 849        ssize_t base = info->cp;
 850        GimpParasite *p;
 851        while (info->cp - base < prop_size)
 852        {
 853        p = xcf_load_parasite(info);
 854        gimp_drawable_parasite_attach(GIMP_DRAWABLE(layer), p);
 855        gimp_parasite_free(p);
 856        }
 857        if (info->cp - base != prop_size)
 858        g_message ("Error detected while loading a layer's parasites");
 859        */
 860      }
 861      break;
 862     default:
 863       /* g_message ("unexpected/unknown layer property: %d (skipping)",
 864          prop_type); */
 865
 866       {
 867       int buf[16];
 868       ssize_t amount;
 869
 870       /* read over it... */
 871       while ((prop_size > 0) && (EOFBlob(image) == MagickFalse))
 872         {
 873         amount = (ssize_t) MagickMin(16, prop_size);
 874         amount = ReadBlob(image, (size_t) amount, (unsigned char *) &buf);
 875         if (!amount)
 876           ThrowBinaryException(CorruptImageError,"CorruptImage",
 877             image->filename);
 878         prop_size -= (size_t) MagickMin(16, (size_t) amount);
 879         }
 880       }
 881       break;
 882     }
 883   }
 884
 885   if (foundPropEnd == MagickFalse)
 886     return(MagickFalse);
 887   /* allocate the image for this layer */
 888   if (image_info->number_scenes != 0)
 889     {
 890       ssize_t
 891         scene;
 892
 893       scene=inDocInfo->number_layers-layer-1;
 894       if (scene > (ssize_t) (image_info->scene+image_info->number_scenes-1))
 895         {
 896           outLayer->image=CloneImage(image,0,0,MagickTrue,exception);
 897           if (outLayer->image == (Image *) NULL)
 898             return(MagickFalse);
 899           InitXCFImage(outLayer,exception);
 900           return(MagickTrue);
 901         }
 902     }
 903   outLayer->image=CloneImage(image,outLayer->width, outLayer->height,MagickTrue,
 904     exception);
 905   if (outLayer->image == (Image *) NULL)
 906     return(MagickFalse);
 907   /* clear the image based on the layer opacity */
 908   outLayer->image->background_color.alpha=
 909     ScaleCharToQuantum((unsigned char) outLayer->alpha);
 910   (void) SetImageBackgroundColor(outLayer->image,exception);
 911
 912   InitXCFImage(outLayer,exception);
 913
 914   /* set the compositing mode */
 915   outLayer->image->compose = GIMPBlendModeToCompositeOperator( outLayer->mode );
 916   if ( outLayer->visible == MagickFalse )
 917     {
 918       /* BOGUS: should really be separate member var! */
 919       outLayer->image->compose = NoCompositeOp;
 920     }
 921
 922   /* read the hierarchy and layer mask offsets */
 923   hierarchy_offset = ReadBlobMSBLong(image);
 924   layer_mask_offset = ReadBlobMSBLong(image);
 925
 926   /* read in the hierarchy */
 927   offset=SeekBlob(image, (MagickOffsetType) hierarchy_offset, SEEK_SET);
 928   if (offset < 0)
 929     (void) ThrowMagickException(exception,GetMagickModule(),
 930       CorruptImageError,"InvalidImageHeader","`%s'",image->filename);
 931   if (load_hierarchy (image, inDocInfo, outLayer, exception) == 0)
 932     return(MagickFalse);
 933
 934   /* read in the layer mask */
 935   if (layer_mask_offset != 0)
 936     {
 937       offset=SeekBlob(image, (MagickOffsetType) layer_mask_offset, SEEK_SET);
 938
 939 #if 0  /* BOGUS: support layer masks! */
 940       layer_mask = xcf_load_layer_mask (info, gimage);
 941       if (layer_mask == 0)
 942   goto error;
 943
 944       /* set the offsets of the layer_mask */
 945       GIMP_DRAWABLE (layer_mask)->offset_x = GIMP_DRAWABLE (layer)->offset_x;
 946       GIMP_DRAWABLE (layer_mask)->offset_y = GIMP_DRAWABLE (layer)->offset_y;
 947
 948       gimp_layer_add_mask (layer, layer_mask, MagickFalse);
 949
 950       layer->mask->apply_mask = apply_mask;
 951       layer->mask->edit_mask  = edit_mask;
 952       layer->mask->show_mask  = show_mask;
 953 #endif
 954   }
 955
 956   /* attach the floating selection... */
 957 #if 0  /* BOGUS: we may need to read this, even if we don't support it! */
 958   if (add_floating_sel)
 959     {
 960       GimpLayer *floating_sel;
 961
 962       floating_sel = info->floating_sel;
 963       floating_sel_attach (floating_sel, GIMP_DRAWABLE (layer));
 964     }
 965 #endif
 966
 967   return MagickTrue;
 968 }
 969 \f
 970 /*
 971 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 972 %                                                                             %
 973 %                                                                             %
 974 %                                                                             %
 975 %   R e a d X C F I m a g e                                                   %
 976 %                                                                             %
 977 %                                                                             %
 978 %                                                                             %
 979 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 980 %
 981 %  ReadXCFImage() reads a GIMP (GNU Image Manipulation Program) image
 982 %  file and returns it.  It allocates the memory necessary for the new Image
 983 %  structure and returns a pointer to the new image.
 984 %
 985 %  The format of the ReadXCFImage method is:
 986 %
 987 %      image=ReadXCFImage(image_info)
 988 %
 989 %  A description of each parameter follows:
 990 %
 991 %    o image_info: the image info.
 992 %
 993 %    o exception: return any errors or warnings in this structure.
 994 %
 995 */
 996 static Image *ReadXCFImage(const ImageInfo *image_info,ExceptionInfo *exception)
 997 {
 998   char
 999     magick[14];
1000
1001   Image
1002     *image;
1003
1004   int
1005     foundPropEnd = 0;
1006
1007   MagickBooleanType
1008     status;
1009
1010   MagickOffsetType
1011     offset;
1012
1013   register ssize_t
1014     i;
1015
1016   size_t
1017     image_type,
1018     length;
1019
1020   ssize_t
1021     count;
1022
1023   XCFDocInfo
1024     doc_info;
1025
1026   /*
1027     Open image file.
1028   */
1029   assert(image_info != (const ImageInfo *) NULL);
1030   assert(image_info->signature == MagickCoreSignature);
1031   if (image_info->debug != MagickFalse)
1032     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
1033       image_info->filename);
1034   assert(exception != (ExceptionInfo *) NULL);
1035   assert(exception->signature == MagickCoreSignature);
1036   image=AcquireImage(image_info,exception);
1037   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
1038   if (status == MagickFalse)
1039     {
1040       image=DestroyImageList(image);
1041       return((Image *) NULL);
1042     }
1043   count=ReadBlob(image,14,(unsigned char *) magick);
1044   if ((count != 14) ||
1045       (LocaleNCompare((char *) magick,"gimp xcf",8) != 0))
1046     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1047   (void) ResetMagickMemory(&doc_info,0,sizeof(XCFDocInfo));
1048   doc_info.width=ReadBlobMSBLong(image);
1049   doc_info.height=ReadBlobMSBLong(image);
1050   if ((doc_info.width > 262144) || (doc_info.height > 262144))
1051     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1052   doc_info.image_type=ReadBlobMSBLong(image);
1053   /*
1054     Initialize image attributes.
1055   */
1056   image->columns=doc_info.width;
1057   image->rows=doc_info.height;
1058   image_type=doc_info.image_type;
1059   doc_info.file_size=GetBlobSize(image);
1060   image->compression=NoCompression;
1061   image->depth=8;
1062   if (image_type == GIMP_RGB)
1063     SetImageColorspace(image,sRGBColorspace,exception);
1064   else
1065     if (image_type == GIMP_GRAY)
1066       SetImageColorspace(image,GRAYColorspace,exception);
1067     else
1068       if (image_type == GIMP_INDEXED)
1069         ThrowReaderException(CoderError,"ColormapTypeNotSupported");
1070   (void) SetImageBackgroundColor(image,exception);
1071   (void) SetImageAlpha(image,OpaqueAlpha,exception);
1072   /*
1073     Read properties.
1074   */
1075   while ((foundPropEnd == MagickFalse) && (EOFBlob(image) == MagickFalse))
1076   {
1077     PropType prop_type = (PropType) ReadBlobMSBLong(image);
1078     size_t prop_size = ReadBlobMSBLong(image);
1079
1080     switch (prop_type)
1081     {
1082       case PROP_END:
1083         foundPropEnd=1;
1084         break;
1085       case PROP_COLORMAP:
1086       {
1087         /* Cannot rely on prop_size here--the value is set incorrectly
1088            by some Gimp versions.
1089         */
1090         size_t num_colours = ReadBlobMSBLong(image);
1091         if (DiscardBlobBytes(image,3*num_colours) == MagickFalse)
1092           ThrowFileException(exception,CorruptImageError,
1093             "UnexpectedEndOfFile",image->filename);
1094     /*
1095       if (info->file_version == 0)
1096       {
1097         gint i;
1098
1099         g_message (_("XCF warning: version 0 of XCF file format\n"
1100            "did not save indexed colormaps correctly.\n"
1101            "Substituting grayscale map."));
1102         info->cp +=
1103           xcf_read_int32 (info->fp, (guint32*) &gimage->num_cols, 1);
1104         gimage->cmap = g_new (guchar, gimage->num_cols*3);
1105         xcf_seek_pos (info, info->cp + gimage->num_cols);
1106         for (i = 0; i<gimage->num_cols; i++)
1107           {
1108             gimage->cmap[i*3+0] = i;
1109             gimage->cmap[i*3+1] = i;
1110             gimage->cmap[i*3+2] = i;
1111           }
1112       }
1113       else
1114       {
1115         info->cp +=
1116           xcf_read_int32 (info->fp, (guint32*) &gimage->num_cols, 1);
1117         gimage->cmap = g_new (guchar, gimage->num_cols*3);
1118         info->cp +=
1119           xcf_read_int8 (info->fp,
1120                    (guint8*) gimage->cmap, gimage->num_cols*3);
1121       }
1122      */
1123         break;
1124       }
1125       case PROP_COMPRESSION:
1126       {
1127         doc_info.compression = ReadBlobByte(image);
1128         if ((doc_info.compression != COMPRESS_NONE) &&
1129             (doc_info.compression != COMPRESS_RLE) &&
1130             (doc_info.compression != COMPRESS_ZLIB) &&
1131             (doc_info.compression != COMPRESS_FRACTAL))
1132           ThrowReaderException(CorruptImageError,"UnrecognizedImageCompression");
1133       }
1134       break;
1135
1136       case PROP_GUIDES:
1137       {
1138          /* just skip it - we don't care about guides */
1139         if (DiscardBlobBytes(image,prop_size) == MagickFalse)
1140           ThrowFileException(exception,CorruptImageError,
1141             "UnexpectedEndOfFile",image->filename);
1142       }
1143       break;
1144
1145     case PROP_RESOLUTION:
1146       {
1147         /* float xres = (float) */ (void) ReadBlobMSBLong(image);
1148         /* float yres = (float) */ (void) ReadBlobMSBLong(image);
1149
1150         /*
1151         if (xres < GIMP_MIN_RESOLUTION || xres > GIMP_MAX_RESOLUTION ||
1152             yres < GIMP_MIN_RESOLUTION || yres > GIMP_MAX_RESOLUTION)
1153         {
1154         g_message ("Warning, resolution out of range in XCF file");
1155         xres = gimage->gimp->config->default_xresolution;
1156         yres = gimage->gimp->config->default_yresolution;
1157         }
1158         */
1159
1160
1161         /* BOGUS: we don't write these yet because we aren't
1162               reading them properly yet :(
1163               image->resolution.x = xres;
1164               image->resolution.y = yres;
1165         */
1166       }
1167       break;
1168
1169     case PROP_TATTOO:
1170       {
1171         /* we need to read it, even if we ignore it */
1172         /*size_t  tattoo_state = */ (void) ReadBlobMSBLong(image);
1173       }
1174       break;
1175
1176     case PROP_PARASITES:
1177       {
1178         /* BOGUS: we may need these for IPTC stuff */
1179         if (DiscardBlobBytes(image,prop_size) == MagickFalse)
1180           ThrowFileException(exception,CorruptImageError,
1181             "UnexpectedEndOfFile",image->filename);
1182         /*
1183       gssize_t         base = info->cp;
1184       GimpParasite *p;
1185
1186       while (info->cp - base < prop_size)
1187         {
1188           p = xcf_load_parasite (info);
1189           gimp_image_parasite_attach (gimage, p);
1190           gimp_parasite_free (p);
1191         }
1192       if (info->cp - base != prop_size)
1193         g_message ("Error detected while loading an image's parasites");
1194       */
1195           }
1196       break;
1197
1198     case PROP_UNIT:
1199       {
1200         /* BOGUS: ignore for now... */
1201       /*size_t unit =  */ (void) ReadBlobMSBLong(image);
1202       }
1203       break;
1204
1205     case PROP_PATHS:
1206       {
1207       /* BOGUS: just skip it for now */
1208         if (DiscardBlobBytes(image,prop_size) == MagickFalse)
1209           ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
1210             image->filename);
1211
1212         /*
1213       PathList *paths = xcf_load_bzpaths (gimage, info);
1214       gimp_image_set_paths (gimage, paths);
1215       */
1216       }
1217       break;
1218
1219     case PROP_USER_UNIT:
1220       {
1221         char  unit_string[1000];
1222         /*BOGUS: ignored for now */
1223         /*float  factor = (float) */ (void) ReadBlobMSBLong(image);
1224         /* size_t digits =  */ (void) ReadBlobMSBLong(image);
1225         for (i=0; i<5; i++)
1226          (void) ReadBlobStringWithLongSize(image, unit_string,
1227            sizeof(unit_string),exception);
1228       }
1229      break;
1230
1231       default:
1232       {
1233         int buf[16];
1234         ssize_t amount;
1235
1236       /* read over it... */
1237       while ((prop_size > 0) && (EOFBlob(image) == MagickFalse))
1238       {
1239         amount=(ssize_t) MagickMin(16, prop_size);
1240         amount=(ssize_t) ReadBlob(image,(size_t) amount,(unsigned char *) &buf);
1241         if (!amount)
1242           ThrowReaderException(CorruptImageError,"CorruptImage");
1243         prop_size -= (size_t) MagickMin(16,(size_t) amount);
1244       }
1245     }
1246     break;
1247   }
1248   }
1249   if (foundPropEnd == MagickFalse)
1250     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1251
1252   if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
1253     {
1254       ; /* do nothing, were just pinging! */
1255     }
1256   else
1257     {
1258       int
1259         current_layer = 0,
1260         foundAllLayers = MagickFalse,
1261         number_layers = 0;
1262
1263       MagickOffsetType
1264         oldPos=TellBlob(image);
1265
1266       XCFLayerInfo
1267         *layer_info;
1268
1269       status=SetImageExtent(image,image->columns,image->rows,exception);
1270       if (status == MagickFalse)
1271         return(DestroyImageList(image));
1272       /*
1273         the read pointer
1274       */
1275       do
1276       {
1277         ssize_t offset = (int) ReadBlobMSBLong(image);
1278         if (offset == 0)
1279           foundAllLayers=MagickTrue;
1280         else
1281           number_layers++;
1282         if (EOFBlob(image) != MagickFalse)
1283           {
1284             ThrowFileException(exception,CorruptImageError,
1285               "UnexpectedEndOfFile",image->filename);
1286             break;
1287           }
1288     } while (foundAllLayers == MagickFalse);
1289     doc_info.number_layers=number_layers;
1290     offset=SeekBlob(image,oldPos,SEEK_SET); /* restore the position! */
1291     if (offset < 0)
1292       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1293     /* allocate our array of layer info blocks */
1294     length=(size_t) number_layers;
1295     layer_info=(XCFLayerInfo *) AcquireQuantumMemory(length,
1296       sizeof(*layer_info));
1297     if (layer_info == (XCFLayerInfo *) NULL)
1298       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
1299     (void) ResetMagickMemory(layer_info,0,number_layers*sizeof(XCFLayerInfo));
1300     for ( ; ; )
1301     {
1302       MagickBooleanType
1303         layer_ok;
1304
1305       MagickOffsetType
1306         offset,
1307         saved_pos;
1308
1309       /* read in the offset of the next layer */
1310       offset=(MagickOffsetType) ReadBlobMSBLong(image);
1311       /* if the offset is 0 then we are at the end
1312       *  of the layer list.
1313       */
1314       if (offset == 0)
1315         break;
1316       /* save the current position as it is where the
1317       *  next layer offset is stored.
1318       */
1319       saved_pos=TellBlob(image);
1320       /* seek to the layer offset */
1321       offset=SeekBlob(image,offset,SEEK_SET);
1322       /* read in the layer */
1323       layer_ok=ReadOneLayer(image_info,image,&doc_info,
1324         &layer_info[current_layer],current_layer,exception);
1325       if (layer_ok == MagickFalse)
1326         {
1327           int j;
1328
1329           for (j=0; j < current_layer; j++)
1330             layer_info[j].image=DestroyImage(layer_info[j].image);
1331           layer_info=(XCFLayerInfo *) RelinquishMagickMemory(layer_info);
1332           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
1333         }
1334       /* restore the saved position so we'll be ready to
1335       *  read the next offset.
1336       */
1337       offset=SeekBlob(image, saved_pos, SEEK_SET);
1338       current_layer++;
1339     }
1340 #if 0
1341         {
1342         /* NOTE: XCF layers are REVERSED from composite order! */
1343         signed int  j;
1344         for (j=number_layers-1; j>=0; j--) {
1345           /* BOGUS: need to consider layer blending modes!! */
1346
1347           if ( layer_info[j].visible ) { /* only visible ones, please! */
1348             CompositeImage(image, OverCompositeOp, layer_info[j].image,
1349                      layer_info[j].offset_x, layer_info[j].offset_y );
1350              layer_info[j].image =DestroyImage( layer_info[j].image );
1351
1352             /* If we do this, we'll get REAL gray images! */
1353             if ( image_type == GIMP_GRAY ) {
1354               QuantizeInfo  qi;
1355               GetQuantizeInfo(&qi);
1356               qi.colorspace = GRAYColorspace;
1357               QuantizeImage( &qi, layer_info[j].image );
1358             }
1359           }
1360         }
1361       }
1362 #else
1363       {
1364         /* NOTE: XCF layers are REVERSED from composite order! */
1365         ssize_t  j;
1366
1367         /* now reverse the order of the layers as they are put
1368            into subimages
1369         */
1370         for (j=(ssize_t) number_layers-1; j >= 0; j--)
1371           AppendImageToList(&image,layer_info[j].image);
1372       }
1373 #endif
1374
1375     layer_info=(XCFLayerInfo *) RelinquishMagickMemory(layer_info);
1376
1377 #if 0  /* BOGUS: do we need the channels?? */
1378     while (MagickTrue)
1379     {
1380       /* read in the offset of the next channel */
1381       info->cp += xcf_read_int32 (info->fp, &offset, 1);
1382
1383       /* if the offset is 0 then we are at the end
1384       *  of the channel list.
1385       */
1386       if (offset == 0)
1387         break;
1388
1389       /* save the current position as it is where the
1390       *  next channel offset is stored.
1391       */
1392       saved_pos = info->cp;
1393
1394       /* seek to the channel offset */
1395       xcf_seek_pos (info, offset);
1396
1397       /* read in the layer */
1398       channel = xcf_load_channel (info, gimage);
1399       if (channel == 0)
1400         goto error;
1401
1402       num_successful_elements++;
1403
1404       /* add the channel to the image if its not the selection */
1405       if (channel != gimage->selection_mask)
1406         gimp_image_add_channel (gimage, channel, -1);
1407
1408       /* restore the saved position so we'll be ready to
1409       *  read the next offset.
1410       */
1411       xcf_seek_pos (info, saved_pos);
1412     }
1413 #endif
1414   }
1415
1416   (void) CloseBlob(image);
1417   DestroyImage(RemoveFirstImageFromList(&image));
1418   if (image_type == GIMP_GRAY)
1419     image->type=GrayscaleType;
1420   return(GetFirstImageInList(image));
1421 }
1422 \f
1423 /*
1424 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1425 %                                                                             %
1426 %                                                                             %
1427 %                                                                             %
1428 %   R e g i s t e r X C F I m a g e                                           %
1429 %                                                                             %
1430 %                                                                             %
1431 %                                                                             %
1432 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1433 %
1434 %  RegisterXCFImage() adds attributes for the XCF image format to
1435 %  the list of supported formats.  The attributes include the image format
1436 %  tag, a method to read and/or write the format, whether the format
1437 %  supports the saving of more than one frame to the same file or blob,
1438 %  whether the format supports native in-memory I/O, and a brief
1439 %  description of the format.
1440 %
1441 %  The format of the RegisterXCFImage method is:
1442 %
1443 %      size_t RegisterXCFImage(void)
1444 %
1445 */
1446 ModuleExport size_t RegisterXCFImage(void)
1447 {
1448   MagickInfo
1449     *entry;
1450
1451   entry=AcquireMagickInfo("XCF","XCF","GIMP image");
1452   entry->decoder=(DecodeImageHandler *) ReadXCFImage;
1453   entry->magick=(IsImageFormatHandler *) IsXCF;
1454   entry->flags|=CoderSeekableStreamFlag;
1455   (void) RegisterMagickInfo(entry);
1456   return(MagickImageCoderSignature);
1457 }
1458 \f
1459 /*
1460 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1461 %                                                                             %
1462 %                                                                             %
1463 %                                                                             %
1464 %   U n r e g i s t e r X C F I m a g e                                       %
1465 %                                                                             %
1466 %                                                                             %
1467 %                                                                             %
1468 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1469 %
1470 %  UnregisterXCFImage() removes format registrations made by the
1471 %  XCF module from the list of supported formats.
1472 %
1473 %  The format of the UnregisterXCFImage method is:
1474 %
1475 %      UnregisterXCFImage(void)
1476 %
1477 */
1478 ModuleExport void UnregisterXCFImage(void)
1479 {
1480   (void) UnregisterMagickInfo("XCF");
1481 }