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   unsigned long
 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   unsigned long
 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   unsigned long
 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   unsigned long 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 long 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 long
 305     i;
 306
 307   unsigned long
 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 < (long) 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   long
 338     y;
 339
 340   register long
 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 < (long) 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 < (long) tile_image->columns; x++)
 375         {
 376           q->red=ScaleCharToQuantum(*graydata);
 377           q->green=q->red;
 378           q->blue=q->red;
 379           q->opacity=ScaleCharToQuantum(255-inLayerInfo->opacity);
 380           graydata++;
 381           q++;
 382         }
 383       }
 384     else
 385       if (inDocInfo->image_type == GIMP_RGB)
 386         {
 387           for (x=0; x < (long) tile_image->columns; x++)
 388           {
 389             q->red=ScaleCharToQuantum(xcfdata->red);
 390             q->green=ScaleCharToQuantum(xcfdata->green);
 391             q->blue=ScaleCharToQuantum(xcfdata->blue);
 392             q->opacity=(Quantum) (xcfdata->opacity == 0U ? TransparentOpacity :
 393               ScaleCharToQuantum(255-inLayerInfo->opacity));
 394             xcfdata++;
 395             q++;
 396           }
 397         }
 398      if (SyncAuthenticPixels(tile_image,exception) == MagickFalse)
 399        break;
 400   }
 401   xcfodata=(XCFPixelPacket *) RelinquishMagickMemory(xcfodata);
 402   return MagickTrue;
 403 }
 404
 405 static MagickBooleanType load_tile_rle(Image *image,Image *tile_image,
 406   XCFDocInfo *inDocInfo,XCFLayerInfo *inLayerInfo,size_t data_length)
 407 {
 408   ExceptionInfo
 409     *exception;
 410
 411   long
 412     i,
 413     j;
 414
 415   MagickOffsetType
 416     size;
 417
 418   register PixelPacket
 419     *q;
 420
 421   ssize_t
 422     bytes_per_pixel,
 423     count;
 424
 425   size_t
 426     length;
 427
 428   unsigned char
 429     data,
 430     pixel,
 431     *xcfdata,
 432     *xcfodata,
 433     *xcfdatalimit;
 434
 435   bytes_per_pixel=(ssize_t) inDocInfo->bytes_per_pixel;
 436   xcfdata=(unsigned char *) AcquireQuantumMemory(data_length,sizeof(*xcfdata));
 437   if (xcfdata == (unsigned char *) NULL)
 438     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 439       image->filename);
 440   xcfodata=xcfdata;
 441   count=ReadBlob(image, (size_t) data_length, xcfdata);
 442   xcfdatalimit = xcfodata+count-1;
 443   exception=(&image->exception);
 444   for (i=0; i < (long) bytes_per_pixel; i++)
 445   {
 446     q=GetAuthenticPixels(tile_image,0,0,tile_image->columns,tile_image->rows,exception);
 447     size=(MagickOffsetType) tile_image->rows*tile_image->columns;
 448     while (size > 0)
 449     {
 450       if (xcfdata > xcfdatalimit)
 451         goto bogus_rle;
 452       pixel=(*xcfdata++);
 453       length=(size_t) pixel;
 454       if (length >= 128)
 455         {
 456           length=255-(length-1);
 457           if (length == 128)
 458             {
 459               if (xcfdata >= xcfdatalimit)
 460                 goto bogus_rle;
 461               length=(size_t) ((*xcfdata << 8) + xcfdata[1]);
 462               xcfdata+=2;
 463             }
 464             size-=length;
 465             if (size < 0)
 466               goto bogus_rle;
 467             if (&xcfdata[length-1] > xcfdatalimit)
 468               goto bogus_rle;
 469             while (length-- > 0)
 470             {
 471               data=(*xcfdata++);
 472               switch (i)
 473               {
 474                 case 0:
 475                 {
 476                   q->red=ScaleCharToQuantum(data);
 477                   if (inDocInfo->image_type == GIMP_GRAY)
 478                     {
 479                       q->green=ScaleCharToQuantum(data);
 480                       q->blue=ScaleCharToQuantum(data);
 481                       q->opacity=ScaleCharToQuantum(255-inLayerInfo->opacity);
 482                     }
 483                   else
 484                     {
 485                       q->green= q->red;
 486                       q->blue= q->red;
 487                       q->opacity=ScaleCharToQuantum(255-inLayerInfo->opacity);
 488                     }
 489                   break;
 490                 }
 491                 case 1:
 492                 {
 493                   q->green=ScaleCharToQuantum(data);
 494                   break;
 495                 }
 496                 case 2:
 497                 {
 498                   q->blue=ScaleCharToQuantum(data);
 499                   break;
 500                 }
 501                 case 3:
 502                 {
 503                   q->opacity=(Quantum) (data == 0 ? TransparentOpacity :
 504                     ScaleCharToQuantum(255-inLayerInfo->opacity));
 505                   break;
 506                 }
 507               }
 508               q++;
 509             }
 510           }
 511         else
 512           {
 513             length+=1;
 514             if (length == 128)
 515               {
 516                 if (xcfdata >= xcfdatalimit)
 517                   goto bogus_rle;
 518                 length=(size_t) ((*xcfdata << 8) + xcfdata[1]);
 519                 xcfdata+=2;
 520               }
 521             size-=length;
 522             if (size < 0)
 523               goto bogus_rle;
 524             if (xcfdata > xcfdatalimit)
 525               goto bogus_rle;
 526             pixel=(*xcfdata++);
 527             for (j= 0; j < (long) length; j++)
 528             {
 529               data=pixel;
 530               switch (i)
 531               {
 532                 case 0:
 533                 {
 534                   q->red=ScaleCharToQuantum(data);
 535                   if (inDocInfo->image_type == GIMP_GRAY)
 536                     {
 537                       q->green=ScaleCharToQuantum(data);
 538                       q->blue=ScaleCharToQuantum(data);
 539                       q->opacity=ScaleCharToQuantum(255-inLayerInfo->opacity);
 540                     }
 541                   else
 542                     {
 543                       q->green=q->red;
 544                       q->blue=q->red;
 545                       q->opacity=ScaleCharToQuantum(255-inLayerInfo->opacity);
 546                     }
 547                   break;
 548                 }
 549                 case 1:
 550                 {
 551                   q->green=ScaleCharToQuantum(data);
 552                   break;
 553                 }
 554                 case 2:
 555                 {
 556                   q->blue=ScaleCharToQuantum(data);
 557                   break;
 558                 }
 559                 case 3:
 560                 {
 561                   q->opacity=(Quantum) (data == 0 ? TransparentOpacity :
 562                     ScaleCharToQuantum(255-inLayerInfo->opacity));
 563                   break;
 564                 }
 565               }
 566               q++;
 567             }
 568           }
 569       }
 570       if (SyncAuthenticPixels(tile_image,exception) == MagickFalse)
 571         break;
 572     }
 573   xcfodata=(unsigned char *) RelinquishMagickMemory(xcfodata);
 574   return(MagickTrue);
 575
 576   bogus_rle:
 577     if (xcfodata != (unsigned char *) NULL)
 578       xcfodata=(unsigned char *) RelinquishMagickMemory(xcfodata);
 579   return(MagickFalse);
 580 }
 581
 582 static MagickBooleanType load_level(Image *image,XCFDocInfo *inDocInfo,
 583   XCFLayerInfo *inLayerInfo)
 584 {
 585   ExceptionInfo
 586     *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 long
 604     i;
 605
 606   unsigned long
 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   exception=inDocInfo->exception;
 617   width=ReadBlobMSBLong(image);
 618   height=ReadBlobMSBLong(image);
 619
 620   /* read in the first tile offset.
 621    *  if it is '0', then this tile level is empty
 622    *  and we can simply return.
 623    */
 624   offset=(MagickOffsetType) ReadBlobMSBLong(image);
 625   if (offset == 0)
 626     return(MagickTrue);
 627   /* Initialise the reference for the in-memory tile-compression
 628    */
 629   ntile_rows=(height+TILE_HEIGHT-1)/TILE_HEIGHT;
 630   ntile_cols=(width+TILE_WIDTH-1)/TILE_WIDTH;
 631   ntiles=ntile_rows*ntile_cols;
 632   for (i = 0; i < (long) ntiles; i++)
 633   {
 634     status=MagickFalse;
 635     if (offset == 0)
 636       ThrowBinaryException(CorruptImageError,"NotEnoughTiles",image->filename);
 637     /* save the current position as it is where the
 638      *  next tile offset is stored.
 639      */
 640     saved_pos=TellBlob(image);
 641     /* read in the offset of the next tile so we can calculate the amount
 642        of data needed for this tile*/
 643     offset2=(MagickOffsetType)ReadBlobMSBLong(image);
 644     /* if the offset is 0 then we need to read in the maximum possible
 645        allowing for negative compression */
 646     if (offset2 == 0)
 647       offset2=(MagickOffsetType) (offset + TILE_WIDTH * TILE_WIDTH * 4* 1.5);
 648     /* seek to the tile offset */
 649     offset=SeekBlob(image, offset, SEEK_SET);
 650
 651       /* allocate the image for the tile
 652         NOTE: the last tile in a row or column may not be a full tile!
 653       */
 654       tile_image_width=(unsigned long) (destLeft == (int) ntile_cols-1 ?
 655         (int) width % TILE_WIDTH : TILE_WIDTH);
 656       if (tile_image_width == 0) tile_image_width=TILE_WIDTH;
 657       tile_image_height = (unsigned long) (destTop == (int) ntile_rows-1 ?
 658         (int) height % TILE_HEIGHT : TILE_HEIGHT);
 659       if (tile_image_height == 0) tile_image_height=TILE_HEIGHT;
 660       tile_image=CloneImage(inLayerInfo->image,tile_image_width,
 661         tile_image_height,MagickTrue,exception);
 662
 663       /* read in the tile */
 664       switch (inDocInfo->compression)
 665       {
 666         case COMPRESS_NONE:
 667           if (load_tile(image,tile_image,inDocInfo,inLayerInfo,(size_t) (offset2-offset)) == 0)
 668             status=MagickTrue;
 669           break;
 670         case COMPRESS_RLE:
 671           if (load_tile_rle (image,tile_image,inDocInfo,inLayerInfo,
 672               (int) (offset2-offset)) == 0)
 673             status=MagickTrue;
 674           break;
 675         case COMPRESS_ZLIB:
 676           ThrowBinaryException(CoderError,"ZipCompressNotSupported",
 677             image->filename)
 678         case COMPRESS_FRACTAL:
 679           ThrowBinaryException(CoderError,"FractalCompressNotSupported",
 680             image->filename)
 681       }
 682
 683       /* composite the tile onto the layer's image, and then destroy it */
 684       (void) CompositeImage(inLayerInfo->image,CopyCompositeOp,tile_image,
 685         destLeft * TILE_WIDTH,destTop*TILE_HEIGHT);
 686       tile_image=DestroyImage(tile_image);
 687
 688       /* adjust tile position */
 689       destLeft++;
 690       if (destLeft >= (int) ntile_cols)
 691         {
 692           destLeft = 0;
 693           destTop++;
 694         }
 695       if (status != MagickFalse)
 696         return(MagickFalse);
 697       /* restore the saved position so we'll be ready to
 698        *  read the next offset.
 699        */
 700       offset=SeekBlob(image, saved_pos, SEEK_SET);
 701       /* read in the offset of the next tile */
 702       offset=(MagickOffsetType) ReadBlobMSBLong(image);
 703     }
 704   if (offset != 0)
 705     ThrowBinaryException(CorruptImageError,"CorruptImage",image->filename)
 706   return(MagickTrue);
 707 }
 708
 709 static MagickBooleanType load_hierarchy(Image *image,XCFDocInfo *inDocInfo,
 710    XCFLayerInfo *inLayer)
 711 {
 712   MagickOffsetType
 713     saved_pos,
 714     offset,
 715     junk;
 716
 717   unsigned long
 718     width,
 719     height,
 720     bytes_per_pixel;
 721
 722   width=ReadBlobMSBLong(image);
 723   height=ReadBlobMSBLong(image);
 724   bytes_per_pixel=inDocInfo->bytes_per_pixel=ReadBlobMSBLong(image);
 725
 726   /* load in the levels...we make sure that the number of levels
 727    *  calculated when the TileManager was created is the same
 728    *  as the number of levels found in the file.
 729    */
 730   offset=(MagickOffsetType) ReadBlobMSBLong(image);  /* top level */
 731
 732   /* discard offsets for layers below first, if any.
 733    */
 734   do
 735   {
 736     junk=(MagickOffsetType) ReadBlobMSBLong(image);
 737   }
 738   while (junk != 0);
 739
 740   /* save the current position as it is where the
 741    *  next level offset is stored.
 742    */
 743   saved_pos=TellBlob(image);
 744
 745   /* seek to the level offset */
 746   offset=SeekBlob(image, offset, SEEK_SET);
 747
 748   /* read in the level */
 749   if (load_level (image, inDocInfo, inLayer) == 0)
 750     return(MagickFalse);
 751   /* restore the saved position so we'll be ready to
 752    *  read the next offset.
 753    */
 754   offset=SeekBlob(image, saved_pos, SEEK_SET);
 755   return(MagickTrue);
 756 }
 757
 758 static MagickBooleanType ReadOneLayer(Image* image,XCFDocInfo* inDocInfo,
 759   XCFLayerInfo *outLayer )
 760 {
 761   long
 762     i;
 763
 764   MagickOffsetType
 765     offset;
 766
 767   unsigned int
 768     foundPropEnd = 0;
 769
 770   unsigned long
 771     hierarchy_offset,
 772     layer_mask_offset;
 773
 774   /* clear the block! */
 775   (void) ResetMagickMemory( outLayer, 0, sizeof( XCFLayerInfo ) );
 776   /* read in the layer width, height, type and name */
 777   outLayer->width = ReadBlobMSBLong(image);
 778   outLayer->height = ReadBlobMSBLong(image);
 779   outLayer->type = ReadBlobMSBLong(image);
 780   (void) ReadBlobStringWithLongSize(image, outLayer->name,
 781     sizeof(outLayer->name));
 782   /* allocate the image for this layer */
 783   outLayer->image=CloneImage(image,outLayer->width, outLayer->height,MagickTrue,
 784      &image->exception);
 785   if (outLayer->image == (Image *) NULL)
 786     return MagickFalse;
 787   /* read the layer properties! */
 788   foundPropEnd = 0;
 789   while ( (foundPropEnd == MagickFalse) && (EOFBlob(image) == MagickFalse) ) {
 790   PropType    prop_type = (PropType) ReadBlobMSBLong(image);
 791   unsigned long  prop_size = ReadBlobMSBLong(image);
 792     switch (prop_type)
 793     {
 794     case PROP_END:
 795       foundPropEnd = 1;
 796       break;
 797     case PROP_ACTIVE_LAYER:
 798       outLayer->active = 1;
 799       break;
 800     case PROP_FLOATING_SELECTION:
 801       outLayer->floating_offset = ReadBlobMSBLong(image);
 802       break;
 803     case PROP_OPACITY:
 804       outLayer->opacity = ReadBlobMSBLong(image);
 805       break;
 806     case PROP_VISIBLE:
 807       outLayer->visible = ReadBlobMSBLong(image);
 808       break;
 809     case PROP_LINKED:
 810       outLayer->linked = ReadBlobMSBLong(image);
 811       break;
 812     case PROP_PRESERVE_TRANSPARENCY:
 813       outLayer->preserve_trans = ReadBlobMSBLong(image);
 814       break;
 815     case PROP_APPLY_MASK:
 816       outLayer->apply_mask = ReadBlobMSBLong(image);
 817       break;
 818     case PROP_EDIT_MASK:
 819       outLayer->edit_mask = ReadBlobMSBLong(image);
 820       break;
 821     case PROP_SHOW_MASK:
 822       outLayer->show_mask = ReadBlobMSBLong(image);
 823       break;
 824     case PROP_OFFSETS:
 825       outLayer->offset_x = (long) ReadBlobMSBLong(image);
 826       outLayer->offset_y = (long) ReadBlobMSBLong(image);
 827       break;
 828     case PROP_MODE:
 829       outLayer->mode = ReadBlobMSBLong(image);
 830       break;
 831     case PROP_TATTOO:
 832       outLayer->preserve_trans = ReadBlobMSBLong(image);
 833       break;
 834      case PROP_PARASITES:
 835      {
 836         for (i=0; i < (long) prop_size; i++ )
 837           (void) ReadBlobByte(image);
 838
 839         /*
 840        long base = info->cp;
 841        GimpParasite *p;
 842        while (info->cp - base < prop_size)
 843        {
 844        p = xcf_load_parasite(info);
 845        gimp_drawable_parasite_attach(GIMP_DRAWABLE(layer), p);
 846        gimp_parasite_free(p);
 847        }
 848        if (info->cp - base != prop_size)
 849        g_message ("Error detected while loading a layer's parasites");
 850        */
 851      }
 852      break;
 853     default:
 854       /* g_message ("unexpected/unknown layer property: %d (skipping)",
 855          prop_type); */
 856
 857       {
 858       int buf[16];
 859       ssize_t amount;
 860
 861       /* read over it... */
 862       while ((prop_size > 0) && (EOFBlob(image) == MagickFalse))
 863         {
 864         amount = (ssize_t) MagickMin(16, prop_size);
 865         amount = ReadBlob(image, (size_t) amount, (unsigned char *) &buf);
 866         if (!amount)
 867           ThrowBinaryException(CorruptImageError,"CorruptImage",
 868             image->filename);
 869         prop_size -= (unsigned long) MagickMin(16, (size_t) amount);
 870         }
 871       }
 872       break;
 873     }
 874   }
 875
 876   if (foundPropEnd == MagickFalse)
 877     return(MagickFalse);
 878   /* clear the image based on the layer opacity */
 879   outLayer->image->background_color.opacity=
 880     ScaleCharToQuantum((unsigned char) (255-outLayer->opacity));
 881   (void) SetImageBackgroundColor(outLayer->image);
 882
 883   /* set the compositing mode */
 884   outLayer->image->compose = GIMPBlendModeToCompositeOperator( outLayer->mode );
 885   if ( outLayer->visible == MagickFalse )
 886     {
 887       /* BOGUS: should really be separate member var! */
 888       outLayer->image->compose = NoCompositeOp;
 889     }
 890
 891   /* read the hierarchy and layer mask offsets */
 892   hierarchy_offset = ReadBlobMSBLong(image);
 893   layer_mask_offset = ReadBlobMSBLong(image);
 894
 895   /* read in the hierarchy */
 896   offset=SeekBlob(image, (MagickOffsetType) hierarchy_offset, SEEK_SET);
 897   if (offset < 0)
 898     (void) ThrowMagickException(&image->exception,GetMagickModule(),
 899       CorruptImageError,"InvalidImageHeader","`%s'",image->filename);
 900   if (load_hierarchy (image, inDocInfo, outLayer) == 0)
 901     return(MagickFalse);
 902
 903   /* read in the layer mask */
 904   if (layer_mask_offset != 0)
 905     {
 906       offset=SeekBlob(image, (MagickOffsetType) layer_mask_offset, SEEK_SET);
 907
 908 #if 0  /* BOGUS: support layer masks! */
 909       layer_mask = xcf_load_layer_mask (info, gimage);
 910       if (layer_mask == 0)
 911   goto error;
 912
 913       /* set the offsets of the layer_mask */
 914       GIMP_DRAWABLE (layer_mask)->offset_x = GIMP_DRAWABLE (layer)->offset_x;
 915       GIMP_DRAWABLE (layer_mask)->offset_y = GIMP_DRAWABLE (layer)->offset_y;
 916
 917       gimp_layer_add_mask (layer, layer_mask, MagickFalse);
 918
 919       layer->mask->apply_mask = apply_mask;
 920       layer->mask->edit_mask  = edit_mask;
 921       layer->mask->show_mask  = show_mask;
 922 #endif
 923   }
 924
 925   /* attach the floating selection... */
 926 #if 0  /* BOGUS: we may need to read this, even if we don't support it! */
 927   if (add_floating_sel)
 928     {
 929       GimpLayer *floating_sel;
 930
 931       floating_sel = info->floating_sel;
 932       floating_sel_attach (floating_sel, GIMP_DRAWABLE (layer));
 933     }
 934 #endif
 935
 936   return MagickTrue;
 937 }
 938
 939 /*
 940 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 941 %                                                                             %
 942 %                                                                             %
 943 %                                                                             %
 944 %   R e a d X C F I m a g e                                                   %
 945 %                                                                             %
 946 %                                                                             %
 947 %                                                                             %
 948 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 949 %
 950 %  ReadXCFImage() reads a GIMP (GNU Image Manipulation Program) image
 951 %  file and returns it.  It allocates the memory necessary for the new Image
 952 %  structure and returns a pointer to the new image.
 953 %
 954 %  The format of the ReadXCFImage method is:
 955 %
 956 %      image=ReadXCFImage(image_info)
 957 %
 958 %  A description of each parameter follows:
 959 %
 960 %    o image_info: the image info.
 961 %
 962 %    o exception: return any errors or warnings in this structure.
 963 %
 964 %
 965 */
 966 static Image *ReadXCFImage(const ImageInfo *image_info,ExceptionInfo *exception)
 967 {
 968   char
 969     magick[14];
 970
 971   Image
 972     *image;
 973
 974   int
 975     foundPropEnd = 0;
 976
 977   MagickBooleanType
 978     status;
 979
 980   MagickOffsetType
 981     offset;
 982
 983   register long
 984     i;
 985
 986   size_t
 987     length;
 988
 989   ssize_t
 990     count;
 991
 992   unsigned long
 993     image_type;
 994
 995   XCFDocInfo
 996     doc_info;
 997
 998   /*
 999     Open image file.
1000   */
1001   assert(image_info != (const ImageInfo *) NULL);
1002   assert(image_info->signature == MagickSignature);
1003   if (image_info->debug != MagickFalse)
1004     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
1005       image_info->filename);
1006   assert(exception != (ExceptionInfo *) NULL);
1007   assert(exception->signature == MagickSignature);
1008   image=AcquireImage(image_info);
1009   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
1010   if (status == MagickFalse)
1011     {
1012       image=DestroyImageList(image);
1013       return((Image *) NULL);
1014     }
1015   count=ReadBlob(image,14,(unsigned char *) magick);
1016   if ((count == 0) ||
1017       (LocaleNCompare((char *) magick,"gimp xcf",8) != 0))
1018     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1019   (void) ResetMagickMemory(&doc_info,0,sizeof(XCFDocInfo));
1020   doc_info.exception=exception;
1021   doc_info.width=ReadBlobMSBLong(image);
1022   doc_info.height=ReadBlobMSBLong(image);
1023   if ((doc_info.width > 262144) || (doc_info.height > 262144))
1024     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1025   doc_info.image_type=ReadBlobMSBLong(image);
1026   /*
1027     Initialize image attributes.
1028   */
1029   image->columns=doc_info.width;
1030   image->rows=doc_info.height;
1031   image_type=doc_info.image_type;
1032   doc_info.file_size=GetBlobSize(image);
1033   image->compression=NoCompression;
1034   image->depth=8;
1035   if (image_type == GIMP_RGB)
1036     image->colorspace=RGBColorspace;
1037   else
1038     if (image_type == GIMP_GRAY)
1039       image->colorspace=GRAYColorspace;
1040     else
1041       if (image_type == GIMP_INDEXED)
1042         ThrowReaderException(CoderError,"ColormapTypeNotSupported");
1043   (void) SetImageBackgroundColor(image);
1044   image->matte=MagickTrue;
1045   /*
1046     Read properties.
1047   */
1048   while ((foundPropEnd == MagickFalse) && (EOFBlob(image) == MagickFalse))
1049   {
1050     PropType prop_type = (PropType) ReadBlobMSBLong(image);
1051     unsigned long prop_size = ReadBlobMSBLong(image);
1052
1053     switch (prop_type)
1054     {
1055       case PROP_END:
1056         foundPropEnd=1;
1057         break;
1058       case PROP_COLORMAP:
1059       {
1060         /* Cannot rely on prop_size here--the value is set incorrectly
1061            by some Gimp versions.
1062         */
1063         unsigned long num_colours = ReadBlobMSBLong(image);
1064         for (i=0; i < (long) (3L*num_colours); i++ )
1065           (void) ReadBlobByte(image);
1066     /*
1067       if (info->file_version == 0)
1068       {
1069         gint i;
1070
1071         g_message (_("XCF warning: version 0 of XCF file format\n"
1072            "did not save indexed colormaps correctly.\n"
1073            "Substituting grayscale map."));
1074         info->cp +=
1075           xcf_read_int32 (info->fp, (guint32*) &gimage->num_cols, 1);
1076         gimage->cmap = g_new (guchar, gimage->num_cols*3);
1077         xcf_seek_pos (info, info->cp + gimage->num_cols);
1078         for (i = 0; i<gimage->num_cols; i++)
1079           {
1080             gimage->cmap[i*3+0] = i;
1081             gimage->cmap[i*3+1] = i;
1082             gimage->cmap[i*3+2] = i;
1083           }
1084       }
1085       else
1086       {
1087         info->cp +=
1088           xcf_read_int32 (info->fp, (guint32*) &gimage->num_cols, 1);
1089         gimage->cmap = g_new (guchar, gimage->num_cols*3);
1090         info->cp +=
1091           xcf_read_int8 (info->fp,
1092                    (guint8*) gimage->cmap, gimage->num_cols*3);
1093       }
1094      */
1095         break;
1096       }
1097       case PROP_COMPRESSION:
1098       {
1099         doc_info.compression = ReadBlobByte(image);
1100         if ((doc_info.compression != COMPRESS_NONE) &&
1101             (doc_info.compression != COMPRESS_RLE) &&
1102             (doc_info.compression != COMPRESS_ZLIB) &&
1103             (doc_info.compression != COMPRESS_FRACTAL))
1104           ThrowReaderException(CorruptImageError,"UnrecognizedImageCompression");
1105       }
1106       break;
1107
1108       case PROP_GUIDES:
1109       {
1110          /* just skip it - we don't care about guides */
1111         for (i=0; i < (long) prop_size; i++ )
1112           if (ReadBlobByte(image) == EOF)
1113             ThrowFileException(exception,CorruptImageError,
1114               "UnexpectedEndOfFile",image->filename);
1115       }
1116       break;
1117
1118     case PROP_RESOLUTION:
1119       {
1120         /* float xres = (float) */ (void) ReadBlobMSBLong(image);
1121         /* float yres = (float) */ (void) ReadBlobMSBLong(image);
1122
1123         /*
1124         if (xres < GIMP_MIN_RESOLUTION || xres > GIMP_MAX_RESOLUTION ||
1125             yres < GIMP_MIN_RESOLUTION || yres > GIMP_MAX_RESOLUTION)
1126         {
1127         g_message ("Warning, resolution out of range in XCF file");
1128         xres = gimage->gimp->config->default_xresolution;
1129         yres = gimage->gimp->config->default_yresolution;
1130         }
1131         */
1132
1133
1134         /* BOGUS: we don't write these yet because we aren't
1135               reading them properly yet :(
1136               image->x_resolution = xres;
1137               image->y_resolution = yres;
1138         */
1139       }
1140       break;
1141
1142     case PROP_TATTOO:
1143       {
1144         /* we need to read it, even if we ignore it */
1145         /*unsigned long  tattoo_state = */ (void) ReadBlobMSBLong(image);
1146       }
1147       break;
1148
1149     case PROP_PARASITES:
1150       {
1151         /* BOGUS: we may need these for IPTC stuff */
1152         for (i=0; i < (long) prop_size; i++ )
1153           if (ReadBlobByte(image) == EOF)
1154             ThrowFileException(exception,CorruptImageError,
1155               "UnexpectedEndOfFile",image->filename);
1156
1157         /*
1158       glong         base = info->cp;
1159       GimpParasite *p;
1160
1161       while (info->cp - base < prop_size)
1162         {
1163           p = xcf_load_parasite (info);
1164           gimp_image_parasite_attach (gimage, p);
1165           gimp_parasite_free (p);
1166         }
1167       if (info->cp - base != prop_size)
1168         g_message ("Error detected while loading an image's parasites");
1169       */
1170           }
1171       break;
1172
1173     case PROP_UNIT:
1174       {
1175         /* BOGUS: ignore for now... */
1176       /*unsigned long unit =  */ (void) ReadBlobMSBLong(image);
1177       }
1178       break;
1179
1180     case PROP_PATHS:
1181       {
1182       /* BOGUS: just skip it for now */
1183         for (i=0; i< (long) prop_size; i++ )
1184           if (ReadBlobByte(image) == EOF)
1185             ThrowFileException(exception,CorruptImageError,
1186               "UnexpectedEndOfFile",image->filename);
1187
1188         /*
1189       PathList *paths = xcf_load_bzpaths (gimage, info);
1190       gimp_image_set_paths (gimage, paths);
1191       */
1192       }
1193       break;
1194
1195     case PROP_USER_UNIT:
1196       {
1197         char  unit_string[1000];
1198         /*BOGUS: ignored for now */
1199         /*float  factor = (float) */ (void) ReadBlobMSBLong(image);
1200         /* unsigned long digits =  */ (void) ReadBlobMSBLong(image);
1201         for (i=0; i<5; i++)
1202          (void) ReadBlobStringWithLongSize(image, unit_string,
1203            sizeof(unit_string));
1204       }
1205      break;
1206
1207       default:
1208       {
1209         int buf[16];
1210         long amount;
1211
1212       /* read over it... */
1213       while ((prop_size > 0) && (EOFBlob(image) == MagickFalse))
1214       {
1215         amount=(long) MagickMin(16, prop_size);
1216         amount=(long) ReadBlob(image,(size_t) amount,(unsigned char *) &buf);
1217         if (!amount)
1218           ThrowReaderException(CorruptImageError,"CorruptImage");
1219         prop_size -= (unsigned long) MagickMin(16,(size_t) amount);
1220       }
1221     }
1222     break;
1223   }
1224   }
1225   if (foundPropEnd == MagickFalse)
1226     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1227
1228   if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
1229     {
1230       ; /* do nothing, were just pinging! */
1231     }
1232   else
1233     {
1234       int
1235         current_layer = 0,
1236         foundAllLayers = MagickFalse,
1237         number_layers = 0;
1238
1239       MagickOffsetType
1240         oldPos=TellBlob(image);
1241
1242       XCFLayerInfo
1243         *layer_info;
1244
1245       /*
1246         the read pointer
1247       */
1248       do
1249       {
1250         long offset = (long) ReadBlobMSBLong(image);
1251         if (offset == 0)
1252           foundAllLayers=MagickTrue;
1253         else
1254           number_layers++;
1255         if (EOFBlob(image) != MagickFalse)
1256           {
1257             ThrowFileException(exception,CorruptImageError,
1258               "UnexpectedEndOfFile",image->filename);
1259             break;
1260           }
1261     } while (foundAllLayers == MagickFalse);
1262     offset=SeekBlob(image,oldPos,SEEK_SET); /* restore the position! */
1263     if (offset < 0)
1264       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
1265     /* allocate our array of layer info blocks */
1266     length=(size_t) number_layers;
1267     layer_info=(XCFLayerInfo *) AcquireQuantumMemory(length,
1268       sizeof(*layer_info));
1269     if (layer_info == (XCFLayerInfo *) NULL)
1270       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
1271     (void) ResetMagickMemory(layer_info,0,number_layers*sizeof(XCFLayerInfo));
1272     for ( ; ; )
1273     {
1274       MagickBooleanType
1275         layer_ok;
1276
1277       MagickOffsetType
1278         offset,
1279         saved_pos;
1280
1281       /* read in the offset of the next layer */
1282       offset=(MagickOffsetType) ReadBlobMSBLong(image);
1283       /* if the offset is 0 then we are at the end
1284       *  of the layer list.
1285       */
1286       if (offset == 0)
1287         break;
1288       /* save the current position as it is where the
1289       *  next layer offset is stored.
1290       */
1291       saved_pos=TellBlob(image);
1292       /* seek to the layer offset */
1293       offset=SeekBlob(image,offset,SEEK_SET);
1294       /* read in the layer */
1295       layer_ok=ReadOneLayer(image,&doc_info,&layer_info[current_layer]);
1296       if (layer_ok == MagickFalse)
1297         {
1298           int j;
1299
1300           for (j=0; j < current_layer; j++)
1301             layer_info[j].image=DestroyImage(layer_info[j].image);
1302         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
1303       }
1304       /* restore the saved position so we'll be ready to
1305       *  read the next offset.
1306       */
1307       offset=SeekBlob(image, saved_pos, SEEK_SET);
1308       current_layer++;
1309     }
1310     if (number_layers == 1)
1311       {
1312         /*
1313           Composite the layer data onto the main image, dispose the layer.
1314         */
1315         (void) CompositeImage(image,OverCompositeOp,layer_info[0].image,
1316           layer_info[0].offset_x,layer_info[0].offset_y);
1317         layer_info[0].image =DestroyImage( layer_info[0].image);
1318       }
1319     else
1320       {
1321 #if 0
1322         {
1323         /* NOTE: XCF layers are REVERSED from composite order! */
1324         signed int  j;
1325         for (j=number_layers-1; j>=0; j--) {
1326           /* BOGUS: need to consider layer blending modes!! */
1327
1328           if ( layer_info[j].visible ) { /* only visible ones, please! */
1329             CompositeImage(image, OverCompositeOp, layer_info[j].image,
1330                      layer_info[j].offset_x, layer_info[j].offset_y );
1331              layer_info[j].image =DestroyImage( layer_info[j].image );
1332
1333             /* Bob says that if we do this, we'll get REAL gray images! */
1334             if ( image_type == GIMP_GRAY ) {
1335               QuantizeInfo  qi;
1336               GetQuantizeInfo(&qi);
1337               qi.colorspace = GRAYColorspace;
1338               QuantizeImage( &qi, layer_info[j].image );
1339             }
1340           }
1341         }
1342       }
1343 #else
1344       {
1345         /* NOTE: XCF layers are REVERSED from composite order! */
1346         signed int  j;
1347
1348         /* first we copy the last layer on top of the main image */
1349         (void) CompositeImage(image,CopyCompositeOp,
1350           layer_info[number_layers-1].image,
1351           layer_info[number_layers-1].offset_x,
1352           layer_info[number_layers-1].offset_y);
1353           layer_info[number_layers-1].image=DestroyImage(
1354             layer_info[number_layers-1].image);
1355
1356         /* now reverse the order of the layers as they are put
1357            into subimages
1358         */
1359         j=number_layers-2;
1360         image->next=layer_info[j].image;
1361         layer_info[j].image->previous=image;
1362         layer_info[j].image->page.x=layer_info[j].offset_x;
1363         layer_info[j].image->page.y=layer_info[j].offset_y;
1364         layer_info[j].image->page.width=layer_info[j].width;
1365         layer_info[j].image->page.height=layer_info[j].height;
1366         for (j=number_layers-3; j>=0; j--)
1367         {
1368           if (j > 0)
1369             layer_info[j].image->next=layer_info[j-1].image;
1370           if (j < (number_layers-1))
1371             layer_info[j].image->previous=layer_info[j+1].image;
1372           layer_info[j].image->page.x=layer_info[j].offset_x;
1373           layer_info[j].image->page.y=layer_info[j].offset_y;
1374           layer_info[j].image->page.width=layer_info[j].width;
1375           layer_info[j].image->page.height=layer_info[j].height;
1376         }
1377       }
1378 #endif
1379     }
1380
1381     layer_info=(XCFLayerInfo *) RelinquishMagickMemory(layer_info);
1382
1383 #if 0  /* BOGUS: do we need the channels?? */
1384     while (MagickTrue)
1385     {
1386       /* read in the offset of the next channel */
1387       info->cp += xcf_read_int32 (info->fp, &offset, 1);
1388
1389       /* if the offset is 0 then we are at the end
1390       *  of the channel list.
1391       */
1392       if (offset == 0)
1393         break;
1394
1395       /* save the current position as it is where the
1396       *  next channel offset is stored.
1397       */
1398       saved_pos = info->cp;
1399
1400       /* seek to the channel offset */
1401       xcf_seek_pos (info, offset);
1402
1403       /* read in the layer */
1404       channel = xcf_load_channel (info, gimage);
1405       if (channel == 0)
1406         goto error;
1407
1408       num_successful_elements++;
1409
1410       /* add the channel to the image if its not the selection */
1411       if (channel != gimage->selection_mask)
1412         gimp_image_add_channel (gimage, channel, -1);
1413
1414       /* restore the saved position so we'll be ready to
1415       *  read the next offset.
1416       */
1417       xcf_seek_pos (info, saved_pos);
1418     }
1419 #endif
1420   }
1421
1422   (void) CloseBlob(image);
1423   if (image_type == GIMP_GRAY)
1424     image->type=GrayscaleType;
1425   return(GetFirstImageInList(image));
1426 }
1427 \f
1428 /*
1429 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1430 %                                                                             %
1431 %                                                                             %
1432 %                                                                             %
1433 %   R e g i s t e r X C F I m a g e                                           %
1434 %                                                                             %
1435 %                                                                             %
1436 %                                                                             %
1437 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1438 %
1439 %  RegisterXCFImage() adds attributes for the XCF image format to
1440 %  the list of supported formats.  The attributes include the image format
1441 %  tag, a method to read and/or write the format, whether the format
1442 %  supports the saving of more than one frame to the same file or blob,
1443 %  whether the format supports native in-memory I/O, and a brief
1444 %  description of the format.
1445 %
1446 %  The format of the RegisterXCFImage method is:
1447 %
1448 %      unsigned long RegisterXCFImage(void)
1449 %
1450 */
1451 ModuleExport unsigned long RegisterXCFImage(void)
1452 {
1453   MagickInfo
1454     *entry;
1455
1456   entry=SetMagickInfo("XCF");
1457   entry->decoder=(DecodeImageHandler *) ReadXCFImage;
1458   entry->magick=(IsImageFormatHandler *) IsXCF;
1459   entry->description=ConstantString("GIMP image");
1460   entry->module=ConstantString("XCF");
1461   entry->seekable_stream=MagickTrue;
1462   (void) RegisterMagickInfo(entry);
1463   return(MagickImageCoderSignature);
1464 }
1465 \f
1466 /*
1467 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1468 %                                                                             %
1469 %                                                                             %
1470 %                                                                             %
1471 %   U n r e g i s t e r X C F I m a g e                                       %
1472 %                                                                             %
1473 %                                                                             %
1474 %                                                                             %
1475 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1476 %
1477 %  UnregisterXCFImage() removes format registrations made by the
1478 %  XCF module from the list of supported formats.
1479 %
1480 %  The format of the UnregisterXCFImage method is:
1481 %
1482 %      UnregisterXCFImage(void)
1483 %
1484 */
1485 ModuleExport void UnregisterXCFImage(void)
1486 {
1487   (void) UnregisterMagickInfo("XCF");
1488 }