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 1999-2010 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 "magick/studio.h"
  43 #include "magick/blob.h"
  44 #include "magick/blob-private.h"
  45 #include "magick/cache.h"
  46 #include "magick/color.h"
  47 #include "magick/composite.h"
  48 #include "magick/exception.h"
  49 #include "magick/exception-private.h"
  50 #include "magick/image.h"
  51 #include "magick/image-private.h"
  52 #include "magick/list.h"
  53 #include "magick/magick.h"
  54 #include "magick/memory_.h"
  55 #include "magick/quantize.h"
  56 #include "magick/quantum-private.h"
  57 #include "magick/static.h"
  58 #include "magick/string_.h"
  59 #include "magick/module.h"
  60 \f
  61 /*
  62   Typedef declarations.
  63 */
  64 typedef enum
  65 {
  66   GIMP_RGB,
  67   GIMP_GRAY,
  68   GIMP_INDEXED
  69 } GimpImageBaseType;
  70
  71 typedef enum
  72 {
  73   PROP_END                   =  0,
  74   PROP_COLORMAP              =  1,
  75   PROP_ACTIVE_LAYER          =  2,
  76   PROP_ACTIVE_CHANNEL        =  3,
  77   PROP_SELECTION             =  4,
  78   PROP_FLOATING_SELECTION    =  5,
  79   PROP_OPACITY               =  6,
  80   PROP_MODE                  =  7,
  81   PROP_VISIBLE               =  8,
  82   PROP_LINKED                =  9,
  83   PROP_PRESERVE_TRANSPARENCY = 10,
  84   PROP_APPLY_MASK            = 11,
  85   PROP_EDIT_MASK             = 12,
  86   PROP_SHOW_MASK             = 13,
  87   PROP_SHOW_MASKED           = 14,
  88   PROP_OFFSETS               = 15,
  89   PROP_COLOR                 = 16,
  90   PROP_COMPRESSION           = 17,
  91   PROP_GUIDES                = 18,
  92   PROP_RESOLUTION            = 19,
  93   PROP_TATTOO                = 20,
  94   PROP_PARASITES             = 21,
  95   PROP_UNIT                  = 22,
  96   PROP_PATHS                 = 23,
  97   PROP_USER_UNIT             = 24
  98 } PropType;
  99
 100 typedef enum
 101 {
 102   COMPRESS_NONE              =  0,
 103   COMPRESS_RLE               =  1,
 104   COMPRESS_ZLIB              =  2,  /* unused */
 105   COMPRESS_FRACTAL           =  3   /* unused */
 106 } XcfCompressionType;
 107
 108 typedef struct
 109 {
 110   size_t
 111     width,
 112     height,
 113     image_type,
 114     bytes_per_pixel;
 115
 116   int
 117     compression;
 118
 119   size_t
 120     file_size;
 121
 122   ExceptionInfo
 123     *exception;
 124 } XCFDocInfo;
 125
 126 typedef struct
 127 {
 128   char
 129     name[1024];
 130
 131   unsigned int
 132     active;
 133
 134   size_t
 135     width,
 136     height,
 137     type,
 138     opacity,
 139     visible,
 140     linked,
 141     preserve_trans,
 142     apply_mask,
 143     show_mask,
 144     edit_mask,
 145     floating_offset;
 146
 147   ssize_t
 148     offset_x,
 149     offset_y;
 150
 151   size_t
 152     mode,
 153     tattoo;
 154
 155   Image
 156     *image;
 157 } XCFLayerInfo;
 158
 159 #define TILE_WIDTH   64
 160 #define TILE_HEIGHT  64
 161
 162 typedef struct
 163 {
 164   unsigned char
 165     red,
 166     green,
 167     blue,
 168     opacity;
 169 } XCFPixelPacket;
 170 \f
 171 /*
 172 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 173 %                                                                             %
 174 %                                                                             %
 175 %                                                                             %
 176 %   I s X C F                                                                 %
 177 %                                                                             %
 178 %                                                                             %
 179 %                                                                             %
 180 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 181 %
 182 %  IsXCF() returns MagickTrue if the image format type, identified by the
 183 %  magick string, is XCF (GIMP native format).
 184 %
 185 %  The format of the IsXCF method is:
 186 %
 187 %      MagickBooleanType IsXCF(const unsigned char *magick,const size_t length)
 188 %
 189 %  A description of each parameter follows:
 190 %
 191 %    o magick: compare image format pattern against these bytes.
 192 %
 193 %    o length: Specifies the length of the magick string.
 194 %
 195 %
 196 */
 197 static MagickBooleanType IsXCF(const unsigned char *magick,const size_t length)
 198 {
 199   if (length < 8)
 200     return(MagickFalse);
 201   if (LocaleNCompare((char *) magick,"gimp xcf",8) == 0)
 202     return(MagickTrue);
 203   return(MagickFalse);
 204 }
 205 \f
 206 typedef enum
 207 {
 208   GIMP_NORMAL_MODE,
 209   GIMP_DISSOLVE_MODE,
 210   GIMP_BEHIND_MODE,
 211   GIMP_MULTIPLY_MODE,
 212   GIMP_SCREEN_MODE,
 213   GIMP_OVERLAY_MODE,
 214   GIMP_DIFFERENCE_MODE,
 215   GIMP_ADDITION_MODE,
 216   GIMP_SUBTRACT_MODE,
 217   GIMP_DARKEN_ONLY_MODE,
 218   GIMP_LIGHTEN_ONLY_MODE,
 219   GIMP_HUE_MODE,
 220   GIMP_SATURATION_MODE,
 221   GIMP_COLOR_MODE,
 222   GIMP_VALUE_MODE,
 223   GIMP_DIVIDE_MODE,
 224   GIMP_DODGE_MODE,
 225   GIMP_BURN_MODE,
 226   GIMP_HARDLIGHT_MODE
 227 } GimpLayerModeEffects;
 228
 229 /*
 230   Simple utility routine to convert between PSD blending modes and
 231   ImageMagick compositing operators
 232 */
 233 static CompositeOperator GIMPBlendModeToCompositeOperator(
 234   size_t blendMode)
 235 {
 236   switch ( blendMode )
 237   {
 238     case GIMP_NORMAL_MODE:    return( OverCompositeOp );
 239     case GIMP_DISSOLVE_MODE:  return( DissolveCompositeOp );
 240     case GIMP_MULTIPLY_MODE:  return( MultiplyCompositeOp );
 241     case GIMP_SCREEN_MODE:    return( ScreenCompositeOp );
 242     case GIMP_OVERLAY_MODE:    return( OverlayCompositeOp );
 243     case GIMP_DIFFERENCE_MODE:  return( DifferenceCompositeOp );
 244     case GIMP_ADDITION_MODE:  return( AddCompositeOp );
 245     case GIMP_SUBTRACT_MODE:  return( SubtractCompositeOp );
 246     case GIMP_DARKEN_ONLY_MODE:  return( DarkenCompositeOp );
 247     case GIMP_LIGHTEN_ONLY_MODE:return( LightenCompositeOp );
 248     case GIMP_HUE_MODE:      return( HueCompositeOp );
 249     case GIMP_SATURATION_MODE:  return( SaturateCompositeOp );
 250     case GIMP_COLOR_MODE:    return( ColorizeCompositeOp );
 251     case GIMP_DODGE_MODE:    return( ColorDodgeCompositeOp );
 252     case GIMP_BURN_MODE:    return( ColorBurnCompositeOp );
 253     case GIMP_HARDLIGHT_MODE:  return( HardLightCompositeOp );
 254     case GIMP_DIVIDE_MODE:    return( DivideCompositeOp );
 255     /* these are the ones we don't support...yet */
 256     case GIMP_BEHIND_MODE:    return( OverCompositeOp );
 257     case GIMP_VALUE_MODE:    return( OverCompositeOp );
 258     default:
 259       return(OverCompositeOp);
 260   }
 261 }
 262 \f
 263 /*
 264 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 265 %                                                                             %
 266 %                                                                             %
 267 %                                                                             %
 268 +   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                       %
 269 %                                                                             %
 270 %                                                                             %
 271 %                                                                             %
 272 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 273 %
 274 %  ReadBlobStringWithLongSize reads characters from a blob or file
 275 %  starting with a ssize_t length byte and then characters to that length
 276 %
 277 %  The format of the ReadBlobStringWithLongSize method is:
 278 %
 279 %      char *ReadBlobStringWithLongSize(Image *image,char *string)
 280 %
 281 %  A description of each parameter follows:
 282 %
 283 %    o image: the image.
 284 %
 285 %    o string: the address of a character buffer.
 286 %
 287 */
 288
 289 static inline size_t MagickMin(const size_t x,const size_t y)
 290 {
 291   if (x < y)
 292     return(x);
 293   return(y);
 294 }
 295
 296 static char *ReadBlobStringWithLongSize(Image *image,char *string,size_t max)
 297 {
 298   int
 299     c;
 300
 301   MagickOffsetType
 302     offset;
 303
 304   register ssize_t
 305     i;
 306
 307   size_t
 308     length;
 309
 310   assert(image != (Image *) NULL);
 311   assert(image->signature == MagickSignature);
 312   assert(max != 0);
 313   if (image->debug != MagickFalse)
 314     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 315   length=ReadBlobMSBLong(image);
 316   for (i=0; i < (ssize_t) MagickMin(length,max-1); i++)
 317   {
 318     c=ReadBlobByte(image);
 319     if (c == EOF)
 320       return((char *) NULL);
 321     string[i]=(char) c;
 322   }
 323   string[i]='\0';
 324   offset=SeekBlob(image,(MagickOffsetType) (length-i),SEEK_CUR);
 325   if (offset < 0)
 326     (void) ThrowMagickException(&image->exception,GetMagickModule(),
 327       CorruptImageError,"ImproperImageHeader","`%s'",image->filename);
 328   return(string);
 329 }
 330
 331 static MagickBooleanType load_tile(Image *image,Image *tile_image,
 332   XCFDocInfo *inDocInfo,XCFLayerInfo *inLayerInfo,size_t data_length)
 333 {
 334   ExceptionInfo
 335     *exception;
 336
 337   ssize_t
 338     y;
 339
 340   register ssize_t
 341     x;
 342
 343   register PixelPacket
 344     *q;
 345
 346   ssize_t
 347     count;
 348
 349   unsigned char
 350     *graydata;
 351
 352   XCFPixelPacket
 353     *xcfdata,
 354     *xcfodata;
 355
 356   xcfdata=(XCFPixelPacket *) AcquireQuantumMemory(data_length,sizeof(*xcfdata));
 357   if (xcfdata == (XCFPixelPacket *) NULL)
 358     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 359       image->filename);
 360   xcfodata=xcfdata;
 361   graydata=(unsigned char *) xcfdata;  /* used by gray and indexed */
 362   count=ReadBlob(image,data_length,(unsigned char *) xcfdata);
 363   if (count != (ssize_t) data_length)
 364     ThrowBinaryException(CorruptImageError,"NotEnoughPixelData",
 365       image->filename);
 366   exception=(&image->exception);
 367   for (y=0; y < (ssize_t) tile_image->rows; y++)
 368   {
 369     q=QueueAuthenticPixels(tile_image,0,y,tile_image->columns,1,exception);
 370     if (q == (PixelPacket *) NULL)
 371       break;
 372     if (inDocInfo->image_type == GIMP_GRAY)
 373       {
 374         for (x=0; x < (ssize_t) tile_image->columns; x++)
 375         {
 376           q->red=ScaleCharToQuantum(*graydata);
 377           q->green=q->red;
 378           q->blue=q->red;
 379           q->opacity=ScaleCharToQuantum((unsigned char) (255-
 380             inLayerInfo->opacity));
 381           graydata++;
 382           q++;
 383         }
 384       }
 385     else
 386       if (inDocInfo->image_type == GIMP_RGB)
 387         {
 388           for (x=0; x < (ssize_t) tile_image->columns; x++)
 389           {
 390             q->red=ScaleCharToQuantum(xcfdata->red);
 391             q->green=ScaleCharToQuantum(xcfdata->green);
 392             q->blue=ScaleCharToQuantum(xcfdata->blue);
 393             q->opacity=(Quantum) (xcfdata->opacity == 0U ? TransparentOpacity :
 394               ScaleCharToQuantum((unsigned char) (255-inLayerInfo->opacity)));
 395             xcfdata++;
 396             q++;
 397           }
 398         }
 399      if (SyncAuthenticPixels(tile_image,exception) == MagickFalse)
 400        break;
 401   }
 402   xcfodata=(XCFPixelPacket *) RelinquishMagickMemory(xcfodata);
 403   return MagickTrue;
 404 }
 405
 406 static MagickBooleanType load_tile_rle(Image *image,Image *tile_image,
 407   XCFDocInfo *inDocInfo,XCFLayerInfo *inLayerInfo,size_t data_length)
 408 {
 409   ExceptionInfo
 410     *exception;
 411
 412   ssize_t
 413     i,
 414     j;
 415
 416   MagickOffsetType
 417     size;
 418
 419   register PixelPacket
 420     *q;
 421
 422   ssize_t
 423     bytes_per_pixel,
 424     count;
 425
 426   size_t
 427     length;
 428
 429   unsigned char
 430     data,
 431     pixel,
 432     *xcfdata,
 433     *xcfodata,
 434     *xcfdatalimit;
 435
 436   bytes_per_pixel=(ssize_t) inDocInfo->bytes_per_pixel;
 437   xcfdata=(unsigned char *) AcquireQuantumMemory(data_length,sizeof(*xcfdata));
 438   if (xcfdata == (unsigned char *) NULL)
 439     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 440       image->filename);
 441   xcfodata=xcfdata;
 442   count=ReadBlob(image, (size_t) data_length, xcfdata);
 443   xcfdatalimit = xcfodata+count-1;
 444   exception=(&image->exception);
 445   for (i=0; i < (ssize_t) bytes_per_pixel; i++)
 446   {
 447     q=GetAuthenticPixels(tile_image,0,0,tile_image->columns,tile_image->rows,exception);
 448     size=(MagickOffsetType) tile_image->rows*tile_image->columns;
 449     while (size > 0)
 450     {
 451       if (xcfdata > xcfdatalimit)
 452         goto bogus_rle;
 453       pixel=(*xcfdata++);
 454       length=(size_t) pixel;
 455       if (length >= 128)
 456         {
 457           length=255-(length-1);
 458           if (length == 128)
 459             {
 460               if (xcfdata >= xcfdatalimit)
 461                 goto bogus_rle;
 462               length=(size_t) ((*xcfdata << 8) + xcfdata[1]);
 463               xcfdata+=2;
 464             }
 465             size-=length;
 466             if (size < 0)
 467               goto bogus_rle;
 468             if (&xcfdata[length-1] > xcfdatalimit)
 469               goto bogus_rle;
 470             while (length-- > 0)
 471             {
 472               data=(*xcfdata++);
 473               switch (i)
 474               {
 475                 case 0:
 476                 {
 477                   q->red=ScaleCharToQuantum(data);
 478                   if (inDocInfo->image_type == GIMP_GRAY)
 479                     {
 480                       q->green=ScaleCharToQuantum(data);
 481                       q->blue=ScaleCharToQuantum(data);
 482                       q->opacity=ScaleCharToQuantum((unsigned char) (255-
 483                         inLayerInfo->opacity));
 484                     }
 485                   else
 486                     {
 487                       q->green= q->red;
 488                       q->blue= q->red;
 489                       q->opacity=ScaleCharToQuantum((unsigned char) (255-
 490                         inLayerInfo->opacity));
 491                     }
 492                   break;
 493                 }
 494                 case 1:
 495                 {
 496                   q->green=ScaleCharToQuantum(data);
 497                   break;
 498                 }
 499                 case 2:
 500                 {
 501                   q->blue=ScaleCharToQuantum(data);
 502                   break;
 503                 }
 504                 case 3:
 505                 {
 506                   q->opacity=(Quantum) (data == 0 ? TransparentOpacity :
 507                     ScaleCharToQuantum((unsigned char) (255-
 508                     inLayerInfo->opacity)));
 509                   break;
 510                 }
 511               }
 512               q++;
 513             }
 514           }
 515         else
 516           {
 517             length+=1;
 518             if (length == 128)
 519               {
 520                 if (xcfdata >= xcfdatalimit)
 521                   goto bogus_rle;
 522                 length=(size_t) ((*xcfdata << 8) + xcfdata[1]);
 523                 xcfdata+=2;
 524               }
 525             size-=length;
 526             if (size < 0)
 527               goto bogus_rle;
 528             if (xcfdata > xcfdatalimit)
 529               goto bogus_rle;
 530             pixel=(*xcfdata++);
 531             for (j= 0; j < (ssize_t) length; j++)
 532             {
 533               data=pixel;
 534               switch (i)
 535               {
 536                 case 0:
 537                 {
 538                   q->red=ScaleCharToQuantum(data);
 539                   if (inDocInfo->image_type == GIMP_GRAY)
 540                     {
 541                       q->green=ScaleCharToQuantum(data);
 542                       q->blue=ScaleCharToQuantum(data);
 543                       q->opacity=ScaleCharToQuantum((unsigned char) (255-
 544                         inLayerInfo->opacity));
 545                     }
 546                   else
 547                     {
 548                       q->green=q->red;
 549                       q->blue=q->red;
 550                       q->opacity=ScaleCharToQuantum((unsigned char) (255-
 551                         inLayerInfo->opacity));
 552                     }
 553                   break;
 554                 }
 555                 case 1:
 556                 {
 557                   q->green=ScaleCharToQuantum(data);
 558                   break;
 559                 }
 560                 case 2:
 561                 {
 562                   q->blue=ScaleCharToQuantum(data);
 563                   break;
 564                 }
 565                 case 3:
 566                 {
 567                   q->opacity=(Quantum) (data == 0 ? TransparentOpacity :
 568                     ScaleCharToQuantum((unsigned char) (255-
 569                     inLayerInfo->opacity)));
 570                   break;
 571                 }
 572               }
 573               q++;
 574             }
 575           }
 576       }
 577       if (SyncAuthenticPixels(tile_image,exception) == MagickFalse)
 578         break;
 579     }
 580   xcfodata=(unsigned char *) RelinquishMagickMemory(xcfodata);
 581   return(MagickTrue);
 582
 583   bogus_rle:
 584     if (xcfodata != (unsigned char *) NULL)
 585       xcfodata=(unsigned char *) RelinquishMagickMemory(xcfodata);
 586   return(MagickFalse);
 587 }
 588
 589 static MagickBooleanType load_level(Image *image,XCFDocInfo *inDocInfo,
 590   XCFLayerInfo *inLayerInfo)
 591 {
 592   ExceptionInfo
 593     *exception;
 594
 595   int
 596     destLeft = 0,
 597     destTop = 0;
 598
 599   Image*
 600     tile_image;
 601
 602   MagickBooleanType
 603     status;
 604
 605   MagickOffsetType
 606     saved_pos,
 607     offset,
 608     offset2;
 609
 610   register ssize_t
 611     i;
 612
 613   size_t
 614     width,
 615     height,
 616     ntiles,
 617     ntile_rows,
 618     ntile_cols,
 619     tile_image_width,
 620     tile_image_height;
 621
 622   /* start reading the data */
 623   exception=inDocInfo->exception;
 624   width=ReadBlobMSBLong(image);
 625   height=ReadBlobMSBLong(image);
 626
 627   /* read in the first tile offset.
 628    *  if it is '0', then this tile level is empty
 629    *  and we can simply return.
 630    */
 631   offset=(MagickOffsetType) ReadBlobMSBLong(image);
 632   if (offset == 0)
 633     return(MagickTrue);
 634   /* Initialise the reference for the in-memory tile-compression
 635    */
 636   ntile_rows=(height+TILE_HEIGHT-1)/TILE_HEIGHT;
 637   ntile_cols=(width+TILE_WIDTH-1)/TILE_WIDTH;
 638   ntiles=ntile_rows*ntile_cols;
 639   for (i = 0; i < (ssize_t) ntiles; i++)
 640   {
 641     status=MagickFalse;
 642     if (offset == 0)
 643       ThrowBinaryException(CorruptImageError,"NotEnoughTiles",image->filename);
 644     /* save the current position as it is where the
 645      *  next tile offset is stored.
 646      */
 647     saved_pos=TellBlob(image);
 648     /* read in the offset of the next tile so we can calculate the amount
 649        of data needed for this tile*/
 650     offset2=(MagickOffsetType)ReadBlobMSBLong(image);
 651     /* if the offset is 0 then we need to read in the maximum possible
 652        allowing for negative compression */
 653     if (offset2 == 0)
 654       offset2=(MagickOffsetType) (offset + TILE_WIDTH * TILE_WIDTH * 4* 1.5);
 655     /* seek to the tile offset */
 656     offset=SeekBlob(image, offset, SEEK_SET);
 657
 658       /* allocate the image for the tile
 659         NOTE: the last tile in a row or column may not be a full tile!
 660       */
 661       tile_image_width=(size_t) (destLeft == (int) ntile_cols-1 ?
 662         (int) width % TILE_WIDTH : TILE_WIDTH);
 663       if (tile_image_width == 0) tile_image_width=TILE_WIDTH;
 664       tile_image_height = (size_t) (destTop == (int) ntile_rows-1 ?
 665         (int) height % TILE_HEIGHT : TILE_HEIGHT);
 666       if (tile_image_height == 0) tile_image_height=TILE_HEIGHT;
 667       tile_image=CloneImage(inLayerInfo->image,tile_image_width,
 668         tile_image_height,MagickTrue,exception);
 669
 670       /* read in the tile */
 671       switch (inDocInfo->compression)
 672       {
 673         case COMPRESS_NONE:
 674           if (load_tile(image,tile_image,inDocInfo,inLayerInfo,(size_t) (offset2-offset)) == 0)
 675             status=MagickTrue;
 676           break;
 677         case COMPRESS_RLE:
 678           if (load_tile_rle (image,tile_image,inDocInfo,inLayerInfo,
 679               (int) (offset2-offset)) == 0)
 680             status=MagickTrue;
 681           break;
 682         case COMPRESS_ZLIB:
 683           ThrowBinaryException(CoderError,"ZipCompressNotSupported",
 684             image->filename)
 685         case COMPRESS_FRACTAL:
 686           ThrowBinaryException(CoderError,"FractalCompressNotSupported",
 687             image->filename)
 688       }
 689
 690       /* composite the tile onto the layer's image, and then destroy it */
 691       (void) CompositeImage(inLayerInfo->image,CopyCompositeOp,tile_image,
 692         destLeft * TILE_WIDTH,destTop*TILE_HEIGHT);
 693       tile_image=DestroyImage(tile_image);
 694
 695       /* adjust tile position */
 696       destLeft++;
 697       if (destLeft >= (int) ntile_cols)
 698         {
 699           destLeft = 0;
 700           destTop++;
 701         }
 702       if (status != MagickFalse)
 703         return(MagickFalse);
 704       /* restore the saved position so we'll be ready to
 705        *  read the next offset.
 706        */
 707       offset=SeekBlob(image, saved_pos, SEEK_SET);
 708       /* read in the offset of the next tile */
 709       offset=(MagickOffsetType) ReadBlobMSBLong(image);
 710     }
 711   if (offset != 0)
 712     ThrowBinaryException(CorruptImageError,"CorruptImage",image->filename)
 713   return(MagickTrue);
 714 }
 715
 716 static MagickBooleanType load_hierarchy(Image *image,XCFDocInfo *inDocInfo,
 717    XCFLayerInfo *inLayer)
 718 {
 719   MagickOffsetType
 720     saved_pos,
 721     offset,
 722     junk;
 723
 724   size_t
 725     width,
 726     height,
 727     bytes_per_pixel;
 728
 729   width=ReadBlobMSBLong(image);
 730   height=ReadBlobMSBLong(image);
 731   bytes_per_pixel=inDocInfo->bytes_per_pixel=ReadBlobMSBLong(image);
 732
 733   /* load in the levels...we make sure that the number of levels
 734    *  calculated when the TileManager was created is the same
 735    *  as the number of levels found in the file.
 736    */
 737   offset=(MagickOffsetType) ReadBlobMSBLong(image);  /* top level */
 738
 739   /* discard offsets for layers below first, if any.
 740    */
 741   do
 742   {
 743     junk=(MagickOffsetType) ReadBlobMSBLong(image);
 744   }
 745   while (junk != 0);
 746
 747   /* save the current position as it is where the
 748    *  next level offset is stored.
 749    */
 750   saved_pos=TellBlob(image);
 751
 752   /* seek to the level offset */
 753   offset=SeekBlob(image, offset, SEEK_SET);
 754
 755   /* read in the level */
 756   if (load_level (image, inDocInfo, inLayer) == 0)
 757     return(MagickFalse);
 758   /* restore the saved position so we'll be ready to
 759    *  read the next offset.
 760    */
 761   offset=SeekBlob(image, saved_pos, SEEK_SET);
 762   return(MagickTrue);
 763 }
 764
 765 static MagickBooleanType ReadOneLayer(Image* image,XCFDocInfo* inDocInfo,
 766   XCFLayerInfo *outLayer )
 767 {
 768   ssize_t
 769     i;
 770
 771   MagickOffsetType
 772     offset;
 773
 774   unsigned int
 775     foundPropEnd = 0;
 776
 777   size_t
 778     hierarchy_offset,
 779     layer_mask_offset;
 780
 781   /* clear the block! */
 782   (void) ResetMagickMemory( outLayer, 0, sizeof( XCFLayerInfo ) );
 783   /* read in the layer width, height, type and name */
 784   outLayer->width = ReadBlobMSBLong(image);
 785   outLayer->height = ReadBlobMSBLong(image);
 786   outLayer->type = ReadBlobMSBLong(image);
 787   (void) ReadBlobStringWithLongSize(image, outLayer->name,
 788     sizeof(outLayer->name));
 789   /* allocate the image for this layer */
 790   outLayer->image=CloneImage(image,outLayer->width, outLayer->height,MagickTrue,
 791      &image->exception);
 792   if (outLayer->image == (Image *) NULL)
 793     return MagickFalse;
 794   /* read the layer properties! */
 795   foundPropEnd = 0;
 796   while ( (foundPropEnd == MagickFalse) && (EOFBlob(image) == MagickFalse) ) {
 797   PropType    prop_type = (PropType) ReadBlobMSBLong(image);
 798   size_t  prop_size = ReadBlobMSBLong(image);
 799     switch (prop_type)
 800     {
 801     case PROP_END:
 802       foundPropEnd = 1;
 803       break;
 804     case PROP_ACTIVE_LAYER:
 805       outLayer->active = 1;
 806       break;
 807     case PROP_FLOATING_SELECTION:
 808       outLayer->floating_offset = ReadBlobMSBLong(image);
 809       break;
 810     case PROP_OPACITY:
 811       outLayer->opacity = ReadBlobMSBLong(image);
 812       break;
 813     case PROP_VISIBLE:
 814       outLayer->visible = ReadBlobMSBLong(image);
 815       break;
 816     case PROP_LINKED:
 817       outLayer->linked = ReadBlobMSBLong(image);
 818       break;
 819     case PROP_PRESERVE_TRANSPARENCY:
 820       outLayer->preserve_trans = ReadBlobMSBLong(image);
 821       break;
 822     case PROP_APPLY_MASK:
 823       outLayer->apply_mask = ReadBlobMSBLong(image);
 824       break;
 825     case PROP_EDIT_MASK:
 826       outLayer->edit_mask = ReadBlobMSBLong(image);
 827       break;
 828     case PROP_SHOW_MASK:
 829       outLayer->show_mask = ReadBlobMSBLong(image);
 830       break;
 831     case PROP_OFFSETS:
 832       outLayer->offset_x = (ssize_t) ReadBlobMSBLong(image);
 833       outLayer->offset_y = (ssize_t) ReadBlobMSBLong(image);
 834       break;
 835     case PROP_MODE:
 836       outLayer->mode = ReadBlobMSBLong(image);
 837       break;
 838     case PROP_TATTOO:
 839       outLayer->preserve_trans = ReadBlobMSBLong(image);
 840       break;
 841      case PROP_PARASITES:
 842      {
 843         for (i=0; i < (ssize_t) prop_size; i++ )
 844           (void) ReadBlobByte(image);
 845
 846         /*
 847        ssize_t base = info->cp;
 848        GimpParasite *p;
 849        while (info->cp - base < prop_size)
 850        {
 851        p = xcf_load_parasite(info);
 852        gimp_drawable_parasite_attach(GIMP_DRAWABLE(layer), p);
 853        gimp_parasite_free(p);
 854        }
 855        if (info->cp - base != prop_size)
 856        g_message ("Error detected while loading a layer's parasites");
 857        */
 858      }
 859      break;
 860     default:
 861       /* g_message ("unexpected/unknown layer property: %d (skipping)",
 862          prop_type); */
 863
 864       {
 865       int buf[16];
 866       ssize_t amount;
 867
 868       /* read over it... */
 869       while ((prop_size > 0) && (EOFBlob(image) == MagickFalse))
 870         {
 871         amount = (ssize_t) MagickMin(16, prop_size);
 872         amount = ReadBlob(image, (size_t) amount, (unsigned char *) &buf);
 873         if (!amount)
 874           ThrowBinaryException(CorruptImageError,"CorruptImage",
 875             image->filename);
 876         prop_size -= (size_t) MagickMin(16, (size_t) amount);
 877         }
 878       }
 879       break;
 880     }
 881   }
 882
 883   if (foundPropEnd == MagickFalse)
 884     return(MagickFalse);
 885   /* clear the image based on the layer opacity */
 886   outLayer->image->background_color.opacity=
 887     ScaleCharToQuantum((unsigned char) (255-outLayer->opacity));
 888   (void) SetImageBackgroundColor(outLayer->image);
 889
 890   /* set the compositing mode */
 891   outLayer->image->compose = GIMPBlendModeToCompositeOperator( outLayer->mode );
 892   if ( outLayer->visible == MagickFalse )
 893     {
 894       /* BOGUS: should really be separate member var! */
 895       outLayer->image->compose = NoCompositeOp;
 896     }
 897
 898   /* read the hierarchy and layer mask offsets */
 899   hierarchy_offset = ReadBlobMSBLong(image);
 900   layer_mask_offset = ReadBlobMSBLong(image);
 901
 902   /* read in the hierarchy */
 903   offset=SeekBlob(image, (MagickOffsetType) hierarchy_offset, SEEK_SET);
 904   if (offset < 0)
 905     (void) ThrowMagickException(&image->exception,GetMagickModule(),
 906       CorruptImageError,"InvalidImageHeader","`%s'",image->filename);
 907   if (load_hierarchy (image, inDocInfo, outLayer) == 0)
 908     return(MagickFalse);
 909
 910   /* read in the layer mask */
 911   if (layer_mask_offset != 0)
 912     {
 913       offset=SeekBlob(image, (MagickOffsetType) layer_mask_offset, SEEK_SET);
 914
 915 #if 0  /* BOGUS: support layer masks! */
 916       layer_mask = xcf_load_layer_mask (info, gimage);
 917       if (layer_mask == 0)
 918   goto error;
 919
 920       /* set the offsets of the layer_mask */
 921       GIMP_DRAWABLE (layer_mask)->offset_x = GIMP_DRAWABLE (layer)->offset_x;
 922       GIMP_DRAWABLE (layer_mask)->offset_y = GIMP_DRAWABLE (layer)->offset_y;
 923
 924       gimp_layer_add_mask (layer, layer_mask, MagickFalse);
 925
 926       layer->mask->apply_mask = apply_mask;
 927       layer->mask->edit_mask  = edit_mask;
 928       layer->mask->show_mask  = show_mask;
 929 #endif
 930   }
 931
 932   /* attach the floating selection... */
 933 #if 0  /* BOGUS: we may need to read this, even if we don't support it! */
 934   if (add_floating_sel)
 935     {
 936       GimpLayer *floating_sel;
 937
 938       floating_sel = info->floating_sel;
 939       floating_sel_attach (floating_sel, GIMP_DRAWABLE (layer));
 940     }
 941 #endif
 942
 943   return MagickTrue;
 944 }
 945
 946 /*
 947 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 948 %                                                                             %
 949 %                                                                             %
 950 %                                                                             %
 951 %   R e a d X C F I m a g e                                                   %
 952 %                                                                             %
 953 %                                                                             %
 954 %                                                                             %
 955 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 956 %
 957 %  ReadXCFImage() reads a GIMP (GNU Image Manipulation Program) image
 958 %  file and returns it.  It allocates the memory necessary for the new Image
 959 %  structure and returns a pointer to the new image.
 960 %
 961 %  The format of the ReadXCFImage method is:
 962 %
 963 %      image=ReadXCFImage(image_info)
 964 %
 965 %  A description of each parameter follows:
 966 %
 967 %    o image_info: the image info.
 968 %
 969 %    o exception: return any errors or warnings in this structure.
 970 %
 971 %
 972 */
 973 static Image *ReadXCFImage(const ImageInfo *image_info,ExceptionInfo *exception)
 974 {
 975   char
 976     magick[14];
 977
 978   Image
 979     *image;
 980
 981   int
 982     foundPropEnd = 0;
 983
 984   MagickBooleanType
 985     status;
 986
 987   MagickOffsetType
 988     offset;
 989
 990   register ssize_t
 991     i;
 992
 993   size_t
 994     length;
 995
 996   ssize_t
 997     count;
 998
 999   size_t
1000     image_type;
1001
1002   XCFDocInfo
1003     doc_info;
1004
1005   /*
1006     Open image file.
1007   */
1008   assert(image_info != (const ImageInfo *) NULL);
1009   assert(image_info->signature == MagickSignature);
1010   if (image_info->debug != MagickFalse)
1011     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
1012       image_info->filename);
1013   assert(exception != (ExceptionInfo *) NULL);
1014   assert(exception->signature == MagickSignature);
1015   image=AcquireImage(image_info);
1016   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
1017   if (status == MagickFalse)
1018     {
1019       image=DestroyImageList(image);
1020       return((Image *) NULL);
1021     }
1022   count=ReadBlob(image,14,(unsigned char *) magick);
1023   if ((count == 0) ||
1024       (LocaleNCompare((char *) magick,"gimp xcf",8) != 0))
1025     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1026   (void) ResetMagickMemory(&doc_info,0,sizeof(XCFDocInfo));
1027   doc_info.exception=exception;
1028   doc_info.width=ReadBlobMSBLong(image);
1029   doc_info.height=ReadBlobMSBLong(image);
1030   if ((doc_info.width > 262144) || (doc_info.height > 262144))
1031     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1032   doc_info.image_type=ReadBlobMSBLong(image);
1033   /*
1034     Initialize image attributes.
1035   */
1036   image->columns=doc_info.width;
1037   image->rows=doc_info.height;
1038   image_type=doc_info.image_type;
1039   doc_info.file_size=GetBlobSize(image);
1040   image->compression=NoCompression;
1041   image->depth=8;
1042   if (image_type == GIMP_RGB)
1043     image->colorspace=RGBColorspace;
1044   else
1045     if (image_type == GIMP_GRAY)
1046       image->colorspace=GRAYColorspace;
1047     else
1048       if (image_type == GIMP_INDEXED)
1049         ThrowReaderException(CoderError,"ColormapTypeNotSupported");
1050   (void) SetImageBackgroundColor(image);
1051   image->matte=MagickTrue;
1052   /*
1053     Read properties.
1054   */
1055   while ((foundPropEnd == MagickFalse) && (EOFBlob(image) == MagickFalse))
1056   {
1057     PropType prop_type = (PropType) ReadBlobMSBLong(image);
1058     size_t prop_size = ReadBlobMSBLong(image);
1059
1060     switch (prop_type)
1061     {
1062       case PROP_END:
1063         foundPropEnd=1;
1064         break;
1065       case PROP_COLORMAP:
1066       {
1067         /* Cannot rely on prop_size here--the value is set incorrectly
1068            by some Gimp versions.
1069         */
1070         size_t num_colours = ReadBlobMSBLong(image);
1071         for (i=0; i < (ssize_t) (3L*num_colours); i++ )
1072           (void) ReadBlobByte(image);
1073     /*
1074       if (info->file_version == 0)
1075       {
1076         gint i;
1077
1078         g_message (_("XCF warning: version 0 of XCF file format\n"
1079            "did not save indexed colormaps correctly.\n"
1080            "Substituting grayscale map."));
1081         info->cp +=
1082           xcf_read_int32 (info->fp, (guint32*) &gimage->num_cols, 1);
1083         gimage->cmap = g_new (guchar, gimage->num_cols*3);
1084         xcf_seek_pos (info, info->cp + gimage->num_cols);
1085         for (i = 0; i<gimage->num_cols; i++)
1086           {
1087             gimage->cmap[i*3+0] = i;
1088             gimage->cmap[i*3+1] = i;
1089             gimage->cmap[i*3+2] = i;
1090           }
1091       }
1092       else
1093       {
1094         info->cp +=
1095           xcf_read_int32 (info->fp, (guint32*) &gimage->num_cols, 1);
1096         gimage->cmap = g_new (guchar, gimage->num_cols*3);
1097         info->cp +=
1098           xcf_read_int8 (info->fp,
1099                    (guint8*) gimage->cmap, gimage->num_cols*3);
1100       }
1101      */
1102         break;
1103       }
1104       case PROP_COMPRESSION:
1105       {
1106         doc_info.compression = ReadBlobByte(image);
1107         if ((doc_info.compression != COMPRESS_NONE) &&
1108             (doc_info.compression != COMPRESS_RLE) &&
1109             (doc_info.compression != COMPRESS_ZLIB) &&
1110             (doc_info.compression != COMPRESS_FRACTAL))
1111           ThrowReaderException(CorruptImageError,"UnrecognizedImageCompression");
1112       }
1113       break;
1114
1115       case PROP_GUIDES:
1116       {
1117          /* just skip it - we don't care about guides */
1118         for (i=0; i < (ssize_t) prop_size; i++ )
1119           if (ReadBlobByte(image) == EOF)
1120             ThrowFileException(exception,CorruptImageError,
1121               "UnexpectedEndOfFile",image->filename);
1122       }
1123       break;
1124
1125     case PROP_RESOLUTION:
1126       {
1127         /* float xres = (float) */ (void) ReadBlobMSBLong(image);
1128         /* float yres = (float) */ (void) ReadBlobMSBLong(image);
1129
1130         /*
1131         if (xres < GIMP_MIN_RESOLUTION || xres > GIMP_MAX_RESOLUTION ||
1132             yres < GIMP_MIN_RESOLUTION || yres > GIMP_MAX_RESOLUTION)
1133         {
1134         g_message ("Warning, resolution out of range in XCF file");
1135         xres = gimage->gimp->config->default_xresolution;
1136         yres = gimage->gimp->config->default_yresolution;
1137         }
1138         */
1139
1140
1141         /* BOGUS: we don't write these yet because we aren't
1142               reading them properly yet :(
1143               image->x_resolution = xres;
1144               image->y_resolution = yres;
1145         */
1146       }
1147       break;
1148
1149     case PROP_TATTOO:
1150       {
1151         /* we need to read it, even if we ignore it */
1152         /*size_t  tattoo_state = */ (void) ReadBlobMSBLong(image);
1153       }
1154       break;
1155
1156     case PROP_PARASITES:
1157       {
1158         /* BOGUS: we may need these for IPTC stuff */
1159         for (i=0; i < (ssize_t) prop_size; i++ )
1160           if (ReadBlobByte(image) == EOF)
1161             ThrowFileException(exception,CorruptImageError,
1162               "UnexpectedEndOfFile",image->filename);
1163
1164         /*
1165       gssize_t         base = info->cp;
1166       GimpParasite *p;
1167
1168       while (info->cp - base < prop_size)
1169         {
1170           p = xcf_load_parasite (info);
1171           gimp_image_parasite_attach (gimage, p);
1172           gimp_parasite_free (p);
1173         }
1174       if (info->cp - base != prop_size)
1175         g_message ("Error detected while loading an image's parasites");
1176       */
1177           }
1178       break;
1179
1180     case PROP_UNIT:
1181       {
1182         /* BOGUS: ignore for now... */
1183       /*size_t unit =  */ (void) ReadBlobMSBLong(image);
1184       }
1185       break;
1186
1187     case PROP_PATHS:
1188       {
1189       /* BOGUS: just skip it for now */
1190         for (i=0; i< (ssize_t) prop_size; i++ )
1191           if (ReadBlobByte(image) == EOF)
1192             ThrowFileException(exception,CorruptImageError,
1193               "UnexpectedEndOfFile",image->filename);
1194
1195         /*
1196       PathList *paths = xcf_load_bzpaths (gimage, info);
1197       gimp_image_set_paths (gimage, paths);
1198       */
1199       }
1200       break;
1201
1202     case PROP_USER_UNIT:
1203       {
1204         char  unit_string[1000];
1205         /*BOGUS: ignored for now */
1206         /*float  factor = (float) */ (void) ReadBlobMSBLong(image);
1207         /* size_t digits =  */ (void) ReadBlobMSBLong(image);
1208         for (i=0; i<5; i++)
1209          (void) ReadBlobStringWithLongSize(image, unit_string,
1210            sizeof(unit_string));
1211       }
1212      break;
1213
1214       default:
1215       {
1216         int buf[16];
1217         ssize_t amount;
1218
1219       /* read over it... */
1220       while ((prop_size > 0) && (EOFBlob(image) == MagickFalse))
1221       {
1222         amount=(ssize_t) MagickMin(16, prop_size);
1223         amount=(ssize_t) ReadBlob(image,(size_t) amount,(unsigned char *) &buf);
1224         if (!amount)
1225           ThrowReaderException(CorruptImageError,"CorruptImage");
1226         prop_size -= (size_t) MagickMin(16,(size_t) amount);
1227       }
1228     }
1229     break;
1230   }
1231   }
1232   if (foundPropEnd == MagickFalse)
1233     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1234
1235   if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
1236     {
1237       ; /* do nothing, were just pinging! */
1238     }
1239   else
1240     {
1241       int
1242         current_layer = 0,
1243         foundAllLayers = MagickFalse,
1244         number_layers = 0;
1245
1246       MagickOffsetType
1247         oldPos=TellBlob(image);
1248
1249       XCFLayerInfo
1250         *layer_info;
1251
1252       /*
1253         the read pointer
1254       */
1255       do
1256       {
1257         ssize_t offset = (ssize_t) ReadBlobMSBLong(image);
1258         if (offset == 0)
1259           foundAllLayers=MagickTrue;
1260         else
1261           number_layers++;
1262         if (EOFBlob(image) != MagickFalse)
1263           {
1264             ThrowFileException(exception,CorruptImageError,
1265               "UnexpectedEndOfFile",image->filename);
1266             break;
1267           }
1268     } while (foundAllLayers == MagickFalse);
1269     offset=SeekBlob(image,oldPos,SEEK_SET); /* restore the position! */
1270     if (offset < 0)
1271       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1272     /* allocate our array of layer info blocks */
1273     length=(size_t) number_layers;
1274     layer_info=(XCFLayerInfo *) AcquireQuantumMemory(length,
1275       sizeof(*layer_info));
1276     if (layer_info == (XCFLayerInfo *) NULL)
1277       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
1278     (void) ResetMagickMemory(layer_info,0,number_layers*sizeof(XCFLayerInfo));
1279     for ( ; ; )
1280     {
1281       MagickBooleanType
1282         layer_ok;
1283
1284       MagickOffsetType
1285         offset,
1286         saved_pos;
1287
1288       /* read in the offset of the next layer */
1289       offset=(MagickOffsetType) ReadBlobMSBLong(image);
1290       /* if the offset is 0 then we are at the end
1291       *  of the layer list.
1292       */
1293       if (offset == 0)
1294         break;
1295       /* save the current position as it is where the
1296       *  next layer offset is stored.
1297       */
1298       saved_pos=TellBlob(image);
1299       /* seek to the layer offset */
1300       offset=SeekBlob(image,offset,SEEK_SET);
1301       /* read in the layer */
1302       layer_ok=ReadOneLayer(image,&doc_info,&layer_info[current_layer]);
1303       if (layer_ok == MagickFalse)
1304         {
1305           int j;
1306
1307           for (j=0; j < current_layer; j++)
1308             layer_info[j].image=DestroyImage(layer_info[j].image);
1309         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
1310       }
1311       /* restore the saved position so we'll be ready to
1312       *  read the next offset.
1313       */
1314       offset=SeekBlob(image, saved_pos, SEEK_SET);
1315       current_layer++;
1316     }
1317     if (number_layers == 1)
1318       {
1319         /*
1320           Composite the layer data onto the main image, dispose the layer.
1321         */
1322         (void) CompositeImage(image,OverCompositeOp,layer_info[0].image,
1323           layer_info[0].offset_x,layer_info[0].offset_y);
1324         layer_info[0].image =DestroyImage( layer_info[0].image);
1325       }
1326     else
1327       {
1328 #if 0
1329         {
1330         /* NOTE: XCF layers are REVERSED from composite order! */
1331         signed int  j;
1332         for (j=number_layers-1; j>=0; j--) {
1333           /* BOGUS: need to consider layer blending modes!! */
1334
1335           if ( layer_info[j].visible ) { /* only visible ones, please! */
1336             CompositeImage(image, OverCompositeOp, layer_info[j].image,
1337                      layer_info[j].offset_x, layer_info[j].offset_y );
1338              layer_info[j].image =DestroyImage( layer_info[j].image );
1339
1340             /* Bob says that if we do this, we'll get REAL gray images! */
1341             if ( image_type == GIMP_GRAY ) {
1342               QuantizeInfo  qi;
1343               GetQuantizeInfo(&qi);
1344               qi.colorspace = GRAYColorspace;
1345               QuantizeImage( &qi, layer_info[j].image );
1346             }
1347           }
1348         }
1349       }
1350 #else
1351       {
1352         /* NOTE: XCF layers are REVERSED from composite order! */
1353         signed int  j;
1354
1355         /* first we copy the last layer on top of the main image */
1356         (void) CompositeImage(image,CopyCompositeOp,
1357           layer_info[number_layers-1].image,
1358           layer_info[number_layers-1].offset_x,
1359           layer_info[number_layers-1].offset_y);
1360           layer_info[number_layers-1].image=DestroyImage(
1361             layer_info[number_layers-1].image);
1362
1363         /* now reverse the order of the layers as they are put
1364            into subimages
1365         */
1366         j=number_layers-2;
1367         image->next=layer_info[j].image;
1368         layer_info[j].image->previous=image;
1369         layer_info[j].image->page.x=layer_info[j].offset_x;
1370         layer_info[j].image->page.y=layer_info[j].offset_y;
1371         layer_info[j].image->page.width=layer_info[j].width;
1372         layer_info[j].image->page.height=layer_info[j].height;
1373         for (j=number_layers-3; j>=0; j--)
1374         {
1375           if (j > 0)
1376             layer_info[j].image->next=layer_info[j-1].image;
1377           if (j < (number_layers-1))
1378             layer_info[j].image->previous=layer_info[j+1].image;
1379           layer_info[j].image->page.x=layer_info[j].offset_x;
1380           layer_info[j].image->page.y=layer_info[j].offset_y;
1381           layer_info[j].image->page.width=layer_info[j].width;
1382           layer_info[j].image->page.height=layer_info[j].height;
1383         }
1384       }
1385 #endif
1386     }
1387
1388     layer_info=(XCFLayerInfo *) RelinquishMagickMemory(layer_info);
1389
1390 #if 0  /* BOGUS: do we need the channels?? */
1391     while (MagickTrue)
1392     {
1393       /* read in the offset of the next channel */
1394       info->cp += xcf_read_int32 (info->fp, &offset, 1);
1395
1396       /* if the offset is 0 then we are at the end
1397       *  of the channel list.
1398       */
1399       if (offset == 0)
1400         break;
1401
1402       /* save the current position as it is where the
1403       *  next channel offset is stored.
1404       */
1405       saved_pos = info->cp;
1406
1407       /* seek to the channel offset */
1408       xcf_seek_pos (info, offset);
1409
1410       /* read in the layer */
1411       channel = xcf_load_channel (info, gimage);
1412       if (channel == 0)
1413         goto error;
1414
1415       num_successful_elements++;
1416
1417       /* add the channel to the image if its not the selection */
1418       if (channel != gimage->selection_mask)
1419         gimp_image_add_channel (gimage, channel, -1);
1420
1421       /* restore the saved position so we'll be ready to
1422       *  read the next offset.
1423       */
1424       xcf_seek_pos (info, saved_pos);
1425     }
1426 #endif
1427   }
1428
1429   (void) CloseBlob(image);
1430   if (image_type == GIMP_GRAY)
1431     image->type=GrayscaleType;
1432   return(GetFirstImageInList(image));
1433 }
1434 \f
1435 /*
1436 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1437 %                                                                             %
1438 %                                                                             %
1439 %                                                                             %
1440 %   R e g i s t e r X C F I m a g e                                           %
1441 %                                                                             %
1442 %                                                                             %
1443 %                                                                             %
1444 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1445 %
1446 %  RegisterXCFImage() adds attributes for the XCF image format to
1447 %  the list of supported formats.  The attributes include the image format
1448 %  tag, a method to read and/or write the format, whether the format
1449 %  supports the saving of more than one frame to the same file or blob,
1450 %  whether the format supports native in-memory I/O, and a brief
1451 %  description of the format.
1452 %
1453 %  The format of the RegisterXCFImage method is:
1454 %
1455 %      size_t RegisterXCFImage(void)
1456 %
1457 */
1458 ModuleExport size_t RegisterXCFImage(void)
1459 {
1460   MagickInfo
1461     *entry;
1462
1463   entry=SetMagickInfo("XCF");
1464   entry->decoder=(DecodeImageHandler *) ReadXCFImage;
1465   entry->magick=(IsImageFormatHandler *) IsXCF;
1466   entry->description=ConstantString("GIMP image");
1467   entry->module=ConstantString("XCF");
1468   entry->seekable_stream=MagickTrue;
1469   (void) RegisterMagickInfo(entry);
1470   return(MagickImageCoderSignature);
1471 }
1472 \f
1473 /*
1474 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1475 %                                                                             %
1476 %                                                                             %
1477 %                                                                             %
1478 %   U n r e g i s t e r X C F I m a g e                                       %
1479 %                                                                             %
1480 %                                                                             %
1481 %                                                                             %
1482 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1483 %
1484 %  UnregisterXCFImage() removes format registrations made by the
1485 %  XCF module from the list of supported formats.
1486 %
1487 %  The format of the UnregisterXCFImage method is:
1488 %
1489 %      UnregisterXCFImage(void)
1490 %
1491 */
1492 ModuleExport void UnregisterXCFImage(void)
1493 {
1494   (void) UnregisterMagickInfo("XCF");
1495 }