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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                            X   X  W   W  DDDD                               %
   7 %                             X X   W   W  D   D                              %
   8 %                              X    W   W  D   D                              %
   9 %                             X X   W W W  D   D                              %
  10 %                            X   X   W W   DDDD                               %
  11 %                                                                             %
  12 %                                                                             %
  13 %                Read/Write X Windows System Window Dump Format               %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  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-private.h"
  47 #include "magick/colormap.h"
  48 #include "magick/colormap-private.h"
  49 #include "magick/colorspace.h"
  50 #include "magick/exception.h"
  51 #include "magick/exception-private.h"
  52 #include "magick/image.h"
  53 #include "magick/image-private.h"
  54 #include "magick/list.h"
  55 #include "magick/magick.h"
  56 #include "magick/memory_.h"
  57 #include "magick/monitor.h"
  58 #include "magick/monitor-private.h"
  59 #include "magick/property.h"
  60 #include "magick/quantum-private.h"
  61 #include "magick/static.h"
  62 #include "magick/string_.h"
  63 #include "magick/module.h"
  64 #if defined(MAGICKCORE_X11_DELEGATE)
  65 #include "magick/xwindow-private.h"
  66 #if !defined(vms)
  67 #include <X11/XWDFile.h>
  68 #else
  69 #include "XWDFile.h"
  70 #endif
  71 #endif
  72 \f
  73 /*
  74   Forward declarations.
  75 */
  76 #if defined(MAGICKCORE_X11_DELEGATE)
  77 static MagickBooleanType
  78   WriteXWDImage(const ImageInfo *,Image *);
  79 #endif
  80 \f
  81 /*
  82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  83 %                                                                             %
  84 %                                                                             %
  85 %                                                                             %
  86 %   I s X W D                                                                 %
  87 %                                                                             %
  88 %                                                                             %
  89 %                                                                             %
  90 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  91 %
  92 %  IsXWD() returns MagickTrue if the image format type, identified by the
  93 %  magick string, is XWD.
  94 %
  95 %  The format of the IsXWD method is:
  96 %
  97 %      MagickBooleanType IsXWD(const unsigned char *magick,const size_t length)
  98 %
  99 %  A description of each parameter follows:
 100 %
 101 %    o magick: compare image format pattern against these bytes.
 102 %
 103 %    o length: Specifies the length of the magick string.
 104 %
 105 */
 106 static MagickBooleanType IsXWD(const unsigned char *magick,const size_t length)
 107 {
 108   if (length < 8)
 109     return(MagickFalse);
 110   if (memcmp(magick+1,"\000\000",2) == 0)
 111     {
 112       if (memcmp(magick+4,"\007\000\000",3) == 0)
 113         return(MagickTrue);
 114       if (memcmp(magick+5,"\000\000\007",3) == 0)
 115         return(MagickTrue);
 116     }
 117   return(MagickFalse);
 118 }
 119 \f
 120 #if defined(MAGICKCORE_X11_DELEGATE)
 121 /*
 122 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 123 %                                                                             %
 124 %                                                                             %
 125 %                                                                             %
 126 %   R e a d X W D I m a g e                                                   %
 127 %                                                                             %
 128 %                                                                             %
 129 %                                                                             %
 130 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 131 %
 132 %  ReadXWDImage() reads an X Window System window dump image file and
 133 %  returns it.  It allocates the memory necessary for the new Image structure
 134 %  and returns a pointer to the new image.
 135 %
 136 %  The format of the ReadXWDImage method is:
 137 %
 138 %      Image *ReadXWDImage(const ImageInfo *image_info,ExceptionInfo *exception)
 139 %
 140 %  A description of each parameter follows:
 141 %
 142 %    o image_info: the image info.
 143 %
 144 %    o exception: return any errors or warnings in this structure.
 145 %
 146 */
 147
 148 static Image *ReadXWDImage(const ImageInfo *image_info,ExceptionInfo *exception)
 149 {
 150 #define CheckOverflowException(length,width,height) \
 151   (((height) != 0) && ((length)/((size_t) height) != ((size_t) width)))
 152
 153   char
 154     *comment;
 155
 156   Image
 157     *image;
 158
 159   IndexPacket
 160     index;
 161
 162   int
 163     x_status;
 164
 165   ssize_t
 166     y;
 167
 168   MagickBooleanType
 169     authentic_colormap;
 170
 171   MagickStatusType
 172     status;
 173
 174   register IndexPacket
 175     *indexes;
 176
 177   register ssize_t
 178     x;
 179
 180   register PixelPacket
 181     *q;
 182
 183   register ssize_t
 184     i;
 185
 186   register size_t
 187     pixel;
 188
 189   size_t
 190     length;
 191
 192   ssize_t
 193     count;
 194
 195   size_t
 196     lsb_first;
 197
 198   XColor
 199     *colors;
 200
 201   XImage
 202     *ximage;
 203
 204   XWDFileHeader
 205     header;
 206
 207   /*
 208     Open image file.
 209   */
 210   assert(image_info != (const ImageInfo *) NULL);
 211   assert(image_info->signature == MagickSignature);
 212   if (image_info->debug != MagickFalse)
 213     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 214       image_info->filename);
 215   assert(exception != (ExceptionInfo *) NULL);
 216   assert(exception->signature == MagickSignature);
 217   image=AcquireImage(image_info);
 218   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 219   if (status == MagickFalse)
 220     {
 221       image=DestroyImageList(image);
 222       return((Image *) NULL);
 223     }
 224   /*
 225      Read in header information.
 226   */
 227   count=ReadBlob(image,sz_XWDheader,(unsigned char *) &header);
 228   if (count == 0)
 229     ThrowReaderException(CorruptImageError,"UnableToReadImageHeader");
 230   image->columns=header.pixmap_width;
 231   image->rows=header.pixmap_height;
 232   image->depth=8;
 233   /*
 234     Ensure the header byte-order is most-significant byte first.
 235   */
 236   lsb_first=1;
 237   if ((int) (*(char *) &lsb_first) != 0)
 238     MSBOrderLong((unsigned char *) &header,sz_XWDheader);
 239   /*
 240     Check to see if the dump file is in the proper format.
 241   */
 242   if (header.file_version != XWD_FILE_VERSION)
 243     ThrowReaderException(CorruptImageError,"FileFormatVersionMismatch");
 244   if (header.header_size < sz_XWDheader)
 245     ThrowReaderException(CorruptImageError,"CorruptImage");
 246   length=(size_t) header.header_size-sz_XWDheader;
 247   comment=(char *) AcquireQuantumMemory(length+1,sizeof(*comment));
 248   if (comment == (char *) NULL)
 249     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 250   count=ReadBlob(image,length,(unsigned char *) comment);
 251   comment[length]='\0';
 252   (void) SetImageProperty(image,"comment",comment);
 253   comment=DestroyString(comment);
 254   if (count != (ssize_t) length)
 255     ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
 256   /*
 257     Initialize the X image.
 258   */
 259   ximage=(XImage *) AcquireMagickMemory(sizeof(*ximage));
 260   if (ximage == (XImage *) NULL)
 261     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 262   ximage->depth=(int) header.pixmap_depth;
 263   ximage->format=(int) header.pixmap_format;
 264   ximage->xoffset=(int) header.xoffset;
 265   ximage->data=(char *) NULL;
 266   ximage->width=(int) header.pixmap_width;
 267   ximage->height=(int) header.pixmap_height;
 268   ximage->bitmap_pad=(int) header.bitmap_pad;
 269   ximage->bytes_per_line=(int) header.bytes_per_line;
 270   ximage->byte_order=(int) header.byte_order;
 271   ximage->bitmap_unit=(int) header.bitmap_unit;
 272   ximage->bitmap_bit_order=(int) header.bitmap_bit_order;
 273   ximage->bits_per_pixel=(int) header.bits_per_pixel;
 274   ximage->red_mask=header.red_mask;
 275   ximage->green_mask=header.green_mask;
 276   ximage->blue_mask=header.blue_mask;
 277   if ((ximage->depth < 0) || (ximage->width < 0) || (ximage->height < 0) ||
 278       (ximage->bitmap_pad < 0) || (ximage->bytes_per_line < 0))
 279     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 280   if ((ximage->bits_per_pixel > 32) || (ximage->bitmap_unit > 32))
 281     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 282   x_status=XInitImage(ximage);
 283   if (x_status == 0)
 284     ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
 285   /*
 286     Read colormap.
 287   */
 288   authentic_colormap=MagickFalse;
 289   colors=(XColor *) NULL;
 290   if (header.ncolors != 0)
 291     {
 292       XWDColor
 293         color;
 294
 295       length=(size_t) header.ncolors;
 296       colors=(XColor *) AcquireQuantumMemory(length,sizeof(*colors));
 297       if (colors == (XColor *) NULL)
 298         ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 299       for (i=0; i < (ssize_t) header.ncolors; i++)
 300       {
 301         count=ReadBlob(image,sz_XWDColor,(unsigned char *) &color);
 302         if (count == 0)
 303           ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
 304         colors[i].pixel=color.pixel;
 305         colors[i].red=color.red;
 306         colors[i].green=color.green;
 307         colors[i].blue=color.blue;
 308         colors[i].flags=(char) color.flags;
 309         if (color.flags != 0)
 310          authentic_colormap=MagickTrue;
 311       }
 312       /*
 313         Ensure the header byte-order is most-significant byte first.
 314       */
 315       lsb_first=1;
 316       if ((int) (*(char *) &lsb_first) != 0)
 317         for (i=0; i < (ssize_t) header.ncolors; i++)
 318         {
 319           MSBOrderLong((unsigned char *) &colors[i].pixel,
 320             sizeof(colors[i].pixel));
 321           MSBOrderShort((unsigned char *) &colors[i].red,3*
 322             sizeof(colors[i].red));
 323         }
 324     }
 325   /*
 326     Allocate the pixel buffer.
 327   */
 328   length=(size_t) ximage->bytes_per_line*ximage->height;
 329   if (CheckOverflowException(length,ximage->bytes_per_line,ximage->height))
 330     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 331   if (ximage->format != ZPixmap)
 332     {
 333       size_t
 334         extent;
 335
 336       extent=length;
 337       length*=ximage->depth;
 338       if (CheckOverflowException(length,extent,ximage->depth))
 339         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 340     }
 341   ximage->data=(char *) AcquireQuantumMemory(length,sizeof(*ximage->data));
 342   if (ximage->data == (char *) NULL)
 343     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 344   count=ReadBlob(image,length,(unsigned char *) ximage->data);
 345   if (count == 0)
 346     ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
 347   /*
 348     Convert image to MIFF format.
 349   */
 350   image->columns=(size_t) ximage->width;
 351   image->rows=(size_t) ximage->height;
 352   if ((colors == (XColor *) NULL) || (ximage->red_mask != 0) ||
 353       (ximage->green_mask != 0) || (ximage->blue_mask != 0))
 354     image->storage_class=DirectClass;
 355   else
 356     image->storage_class=PseudoClass;
 357   image->colors=header.ncolors;
 358   if (image_info->ping == MagickFalse)
 359     switch (image->storage_class)
 360     {
 361       case DirectClass:
 362       default:
 363       {
 364         register size_t
 365           color;
 366
 367         size_t
 368           blue_mask,
 369           blue_shift,
 370           green_mask,
 371           green_shift,
 372           red_mask,
 373           red_shift;
 374
 375         /*
 376           Determine shift and mask for red, green, and blue.
 377         */
 378         red_mask=ximage->red_mask;
 379         red_shift=0;
 380         while ((red_mask != 0) && ((red_mask & 0x01) == 0))
 381         {
 382           red_mask>>=1;
 383           red_shift++;
 384         }
 385         green_mask=ximage->green_mask;
 386         green_shift=0;
 387         while ((green_mask != 0) && ((green_mask & 0x01) == 0))
 388         {
 389           green_mask>>=1;
 390           green_shift++;
 391         }
 392         blue_mask=ximage->blue_mask;
 393         blue_shift=0;
 394         while ((blue_mask != 0) && ((blue_mask & 0x01) == 0))
 395         {
 396           blue_mask>>=1;
 397           blue_shift++;
 398         }
 399         /*
 400           Convert X image to DirectClass packets.
 401         */
 402         if ((image->colors != 0) && (authentic_colormap != MagickFalse))
 403           for (y=0; y < (ssize_t) image->rows; y++)
 404           {
 405             q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 406             if (q == (PixelPacket *) NULL)
 407               break;
 408             for (x=0; x < (ssize_t) image->columns; x++)
 409             {
 410               pixel=XGetPixel(ximage,(int) x,(int) y);
 411               index=(IndexPacket) ((pixel >> red_shift) & red_mask);
 412               q->red=ScaleShortToQuantum(colors[(ssize_t) index].red);
 413               index=(IndexPacket) ((pixel >> green_shift) & green_mask);
 414               q->green=ScaleShortToQuantum(colors[(ssize_t) index].green);
 415               index=(IndexPacket) ((pixel >> blue_shift) & blue_mask);
 416               q->blue=ScaleShortToQuantum(colors[(ssize_t) index].blue);
 417               q++;
 418             }
 419             if (SyncAuthenticPixels(image,exception) == MagickFalse)
 420               break;
 421             status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 422                 image->rows);
 423             if (status == MagickFalse)
 424               break;
 425           }
 426         else
 427           for (y=0; y < (ssize_t) image->rows; y++)
 428           {
 429             q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 430             if (q == (PixelPacket *) NULL)
 431               break;
 432             for (x=0; x < (ssize_t) image->columns; x++)
 433             {
 434               pixel=XGetPixel(ximage,(int) x,(int) y);
 435               color=(pixel >> red_shift) & red_mask;
 436               color=(color*65535UL)/red_mask;
 437               q->red=ScaleShortToQuantum((unsigned short) color);
 438               color=(pixel >> green_shift) & green_mask;
 439               color=(color*65535UL)/green_mask;
 440               q->green=ScaleShortToQuantum((unsigned short) color);
 441               color=(pixel >> blue_shift) & blue_mask;
 442               color=(color*65535UL)/blue_mask;
 443               q->blue=ScaleShortToQuantum((unsigned short) color);
 444               q++;
 445             }
 446             if (SyncAuthenticPixels(image,exception) == MagickFalse)
 447               break;
 448             status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 449                 image->rows);
 450             if (status == MagickFalse)
 451               break;
 452           }
 453         break;
 454       }
 455       case PseudoClass:
 456       {
 457         /*
 458           Convert X image to PseudoClass packets.
 459         */
 460         if (AcquireImageColormap(image,image->colors) == MagickFalse)
 461           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 462         for (i=0; i < (ssize_t) image->colors; i++)
 463         {
 464           image->colormap[i].red=ScaleShortToQuantum(colors[i].red);
 465           image->colormap[i].green=ScaleShortToQuantum(colors[i].green);
 466           image->colormap[i].blue=ScaleShortToQuantum(colors[i].blue);
 467         }
 468         for (y=0; y < (ssize_t) image->rows; y++)
 469         {
 470           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 471           if (q == (PixelPacket *) NULL)
 472             break;
 473           indexes=GetAuthenticIndexQueue(image);
 474           for (x=0; x < (ssize_t) image->columns; x++)
 475           {
 476             index=ConstrainColormapIndex(image,XGetPixel(ximage,(int) x,
 477               (int) y));
 478             indexes[x]=index;
 479             *q++=image->colormap[(ssize_t) index];
 480           }
 481           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 482             break;
 483           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 484                 image->rows);
 485           if (status == MagickFalse)
 486             break;
 487         }
 488         break;
 489       }
 490     }
 491   /*
 492     Free image and colormap.
 493   */
 494   if (header.ncolors != 0)
 495     colors=(XColor *) RelinquishMagickMemory(colors);
 496   ximage->data=DestroyString(ximage->data);
 497   ximage=(XImage *) RelinquishMagickMemory(ximage);
 498   if (EOFBlob(image) != MagickFalse)
 499     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 500       image->filename);
 501   (void) CloseBlob(image);
 502   return(GetFirstImageInList(image));
 503 }
 504 #endif
 505 \f
 506 /*
 507 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 508 %                                                                             %
 509 %                                                                             %
 510 %                                                                             %
 511 %   R e g i s t e r X W D I m a g e                                           %
 512 %                                                                             %
 513 %                                                                             %
 514 %                                                                             %
 515 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 516 %
 517 %  RegisterXWDImage() adds properties for the XWD image format to
 518 %  the list of supported formats.  The properties include the image format
 519 %  tag, a method to read and/or write the format, whether the format
 520 %  supports the saving of more than one frame to the same file or blob,
 521 %  whether the format supports native in-memory I/O, and a brief
 522 %  description of the format.
 523 %
 524 %  The format of the RegisterXWDImage method is:
 525 %
 526 %      size_t RegisterXWDImage(void)
 527 %
 528 */
 529 ModuleExport size_t RegisterXWDImage(void)
 530 {
 531   MagickInfo
 532     *entry;
 533
 534   entry=SetMagickInfo("XWD");
 535 #if defined(MAGICKCORE_X11_DELEGATE)
 536   entry->decoder=(DecodeImageHandler *) ReadXWDImage;
 537   entry->encoder=(EncodeImageHandler *) WriteXWDImage;
 538 #endif
 539   entry->magick=(IsImageFormatHandler *) IsXWD;
 540   entry->adjoin=MagickFalse;
 541   entry->description=ConstantString("X Windows system window dump (color)");
 542   entry->module=ConstantString("XWD");
 543   (void) RegisterMagickInfo(entry);
 544   return(MagickImageCoderSignature);
 545 }
 546 \f
 547 /*
 548 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 549 %                                                                             %
 550 %                                                                             %
 551 %                                                                             %
 552 %   U n r e g i s t e r X W D I m a g e                                       %
 553 %                                                                             %
 554 %                                                                             %
 555 %                                                                             %
 556 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 557 %
 558 %  UnregisterXWDImage() removes format registrations made by the
 559 %  XWD module from the list of supported formats.
 560 %
 561 %  The format of the UnregisterXWDImage method is:
 562 %
 563 %      UnregisterXWDImage(void)
 564 %
 565 */
 566 ModuleExport void UnregisterXWDImage(void)
 567 {
 568   (void) UnregisterMagickInfo("XWD");
 569 }
 570 \f
 571 #if defined(MAGICKCORE_X11_DELEGATE)
 572 /*
 573 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 574 %                                                                             %
 575 %                                                                             %
 576 %                                                                             %
 577 %   W r i t e X W D I m a g e                                                 %
 578 %                                                                             %
 579 %                                                                             %
 580 %                                                                             %
 581 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 582 %
 583 %  WriteXWDImage() writes an image to a file in X window dump
 584 %  rasterfile format.
 585 %
 586 %  The format of the WriteXWDImage method is:
 587 %
 588 %      MagickBooleanType WriteXWDImage(const ImageInfo *image_info,Image *image)
 589 %
 590 %  A description of each parameter follows.
 591 %
 592 %    o image_info: the image info.
 593 %
 594 %    o image:  The image.
 595 %
 596 */
 597 static MagickBooleanType WriteXWDImage(const ImageInfo *image_info,Image *image)
 598 {
 599   const char
 600     *value;
 601
 602   ssize_t
 603     y;
 604
 605   MagickBooleanType
 606     status;
 607
 608   register const IndexPacket
 609     *indexes;
 610
 611   register const PixelPacket
 612     *p;
 613
 614   register ssize_t
 615     x;
 616
 617   register ssize_t
 618     i;
 619
 620   register unsigned char
 621     *q;
 622
 623   size_t
 624     length;
 625
 626   unsigned char
 627     *pixels;
 628
 629   size_t
 630     bits_per_pixel,
 631     bytes_per_line,
 632     lsb_first,
 633     scanline_pad;
 634
 635   XWDFileHeader
 636     xwd_info;
 637
 638   /*
 639     Open output image file.
 640   */
 641   assert(image_info != (const ImageInfo *) NULL);
 642   assert(image_info->signature == MagickSignature);
 643   assert(image != (Image *) NULL);
 644   assert(image->signature == MagickSignature);
 645   if (image->debug != MagickFalse)
 646     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 647   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 648   if (status == MagickFalse)
 649     return(status);
 650   if (image->colorspace != RGBColorspace)
 651     (void) TransformImageColorspace(image,RGBColorspace);
 652   /*
 653     Initialize XWD file header.
 654   */
 655   (void) ResetMagickMemory(&xwd_info,0,sizeof(xwd_info));
 656   xwd_info.header_size=(CARD32) sz_XWDheader;
 657   value=GetImageProperty(image,"comment");
 658   if (value != (const char *) NULL)
 659     xwd_info.header_size+=(CARD32) strlen(value);
 660   xwd_info.header_size++;
 661   xwd_info.file_version=(CARD32) XWD_FILE_VERSION;
 662   xwd_info.pixmap_format=(CARD32) ZPixmap;
 663   xwd_info.pixmap_depth=(CARD32) (image->storage_class == DirectClass ? 24 : 8);
 664   xwd_info.pixmap_width=(CARD32) image->columns;
 665   xwd_info.pixmap_height=(CARD32) image->rows;
 666   xwd_info.xoffset=(CARD32) 0;
 667   xwd_info.byte_order=(CARD32) MSBFirst;
 668   xwd_info.bitmap_unit=(CARD32) (image->storage_class == DirectClass ? 32 : 8);
 669   xwd_info.bitmap_bit_order=(CARD32) MSBFirst;
 670   xwd_info.bitmap_pad=(CARD32) (image->storage_class == DirectClass ? 32 : 8);
 671   bits_per_pixel=(size_t) (image->storage_class == DirectClass ? 24 : 8);
 672   xwd_info.bits_per_pixel=(CARD32) bits_per_pixel;
 673   bytes_per_line=(CARD32) ((((xwd_info.bits_per_pixel*
 674     xwd_info.pixmap_width)+((xwd_info.bitmap_pad)-1))/
 675     (xwd_info.bitmap_pad))*((xwd_info.bitmap_pad) >> 3));
 676   xwd_info.bytes_per_line=(CARD32) bytes_per_line;
 677   xwd_info.visual_class=(CARD32)
 678     (image->storage_class == DirectClass ? DirectColor : PseudoColor);
 679   xwd_info.red_mask=(CARD32)
 680     (image->storage_class == DirectClass ? 0xff0000 : 0);
 681   xwd_info.green_mask=(CARD32)
 682     (image->storage_class == DirectClass ? 0xff00 : 0);
 683   xwd_info.blue_mask=(CARD32) (image->storage_class == DirectClass ? 0xff : 0);
 684   xwd_info.bits_per_rgb=(CARD32) (image->storage_class == DirectClass ? 24 : 8);
 685   xwd_info.colormap_entries=(CARD32)
 686     (image->storage_class == DirectClass ? 256 : image->colors);
 687   xwd_info.ncolors=(unsigned int)
 688     (image->storage_class == DirectClass ? 0 : image->colors);
 689   xwd_info.window_width=(CARD32) image->columns;
 690   xwd_info.window_height=(CARD32) image->rows;
 691   xwd_info.window_x=0;
 692   xwd_info.window_y=0;
 693   xwd_info.window_bdrwidth=(CARD32) 0;
 694   /*
 695     Write XWD header.
 696   */
 697   lsb_first=1;
 698   if ((int) (*(char *) &lsb_first) != 0)
 699     MSBOrderLong((unsigned char *) &xwd_info,sizeof(xwd_info));
 700   (void) WriteBlob(image,sz_XWDheader,(unsigned char *) &xwd_info);
 701   if (value != (const char *) NULL)
 702     (void) WriteBlob(image,strlen(value),(unsigned char *) value);
 703   (void) WriteBlob(image,1,(const unsigned char *) "\0");
 704   if (image->storage_class == PseudoClass)
 705     {
 706       XColor
 707         *colors;
 708
 709       XWDColor
 710         color;
 711
 712       /*
 713         Dump colormap to file.
 714       */
 715       (void) ResetMagickMemory(&color,0,sizeof(color));
 716       colors=(XColor *) AcquireQuantumMemory((size_t) image->colors,
 717         sizeof(*colors));
 718       if (colors == (XColor *) NULL)
 719         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 720       for (i=0; i < (ssize_t) image->colors; i++)
 721       {
 722         colors[i].pixel=(size_t) i;
 723         colors[i].red=ScaleQuantumToShort(image->colormap[i].red);
 724         colors[i].green=ScaleQuantumToShort(image->colormap[i].green);
 725         colors[i].blue=ScaleQuantumToShort(image->colormap[i].blue);
 726         colors[i].flags=(char) (DoRed | DoGreen | DoBlue);
 727         colors[i].pad='\0';
 728         if ((int) (*(char *) &lsb_first) != 0)
 729           {
 730             MSBOrderLong((unsigned char *) &colors[i].pixel,
 731               sizeof(colors[i].pixel));
 732             MSBOrderShort((unsigned char *) &colors[i].red,
 733               3*sizeof(colors[i].red));
 734           }
 735       }
 736       for (i=0; i < (ssize_t) image->colors; i++)
 737       {
 738         color.pixel=(CARD32) colors[i].pixel;
 739         color.red=colors[i].red;
 740         color.green=colors[i].green;
 741         color.blue=colors[i].blue;
 742         color.flags=(CARD8) colors[i].flags;
 743         (void) WriteBlob(image,sz_XWDColor,(unsigned char *) &color);
 744       }
 745       colors=(XColor *) RelinquishMagickMemory(colors);
 746     }
 747   /*
 748     Allocate memory for pixels.
 749   */
 750   length=3*bytes_per_line;
 751   if (image->storage_class == PseudoClass)
 752     length=bytes_per_line;
 753   pixels=(unsigned char *) AcquireQuantumMemory(length,sizeof(*pixels));
 754   if (pixels == (unsigned char *) NULL)
 755     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 756   (void) ResetMagickMemory(pixels,0,length);
 757   /*
 758     Convert MIFF to XWD raster pixels.
 759   */
 760   scanline_pad=(bytes_per_line-((image->columns*bits_per_pixel) >> 3));
 761   for (y=0; y < (ssize_t) image->rows; y++)
 762   {
 763     p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 764     if (p == (const PixelPacket *) NULL)
 765       break;
 766     q=pixels;
 767     if (image->storage_class == PseudoClass)
 768       {
 769         indexes=GetVirtualIndexQueue(image);
 770         for (x=0; x < (ssize_t) image->columns; x++)
 771           *q++=(unsigned char) indexes[x];
 772       }
 773     else
 774       for (x=0; x < (ssize_t) image->columns; x++)
 775       {
 776         *q++=ScaleQuantumToChar(GetRedPixelComponent(p));
 777         *q++=ScaleQuantumToChar(GetGreenPixelComponent(p));
 778         *q++=ScaleQuantumToChar(GetBluePixelComponent(p));
 779         p++;
 780       }
 781     for (x=0; x < (ssize_t) scanline_pad; x++)
 782       *q++='\0';
 783     (void) WriteBlob(image,(size_t) (q-pixels),pixels);
 784     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 785                 image->rows);
 786     if (status == MagickFalse)
 787       break;
 788   }
 789   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 790   (void) CloseBlob(image);
 791   return(MagickTrue);
 792 }
 793 #endif