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 %                                   Cristy                                    %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2017 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 */
  38 \f
  39 /*
  40   Include declarations.
  41 */
  42 #include "MagickCore/studio.h"
  43 #include "MagickCore/blob.h"
  44 #include "MagickCore/blob-private.h"
  45 #include "MagickCore/cache.h"
  46 #include "MagickCore/color-private.h"
  47 #include "MagickCore/colormap.h"
  48 #include "MagickCore/colormap-private.h"
  49 #include "MagickCore/colorspace.h"
  50 #include "MagickCore/colorspace-private.h"
  51 #include "MagickCore/exception.h"
  52 #include "MagickCore/exception-private.h"
  53 #include "MagickCore/image.h"
  54 #include "MagickCore/image-private.h"
  55 #include "MagickCore/list.h"
  56 #include "MagickCore/magick.h"
  57 #include "MagickCore/memory_.h"
  58 #include "MagickCore/monitor.h"
  59 #include "MagickCore/monitor-private.h"
  60 #include "MagickCore/pixel-accessor.h"
  61 #include "MagickCore/property.h"
  62 #include "MagickCore/quantum-private.h"
  63 #include "MagickCore/static.h"
  64 #include "MagickCore/string_.h"
  65 #include "MagickCore/module.h"
  66 #if defined(MAGICKCORE_X11_DELEGATE)
  67 #include "MagickCore/xwindow-private.h"
  68 #if !defined(vms)
  69 #include <X11/XWDFile.h>
  70 #else
  71 #include "XWDFile.h"
  72 #endif
  73 #endif
  74 \f
  75 /*
  76   Forward declarations.
  77 */
  78 #if defined(MAGICKCORE_X11_DELEGATE)
  79 static MagickBooleanType
  80   WriteXWDImage(const ImageInfo *,Image *,ExceptionInfo *);
  81 #endif
  82 \f
  83 /*
  84 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  85 %                                                                             %
  86 %                                                                             %
  87 %                                                                             %
  88 %   I s X W D                                                                 %
  89 %                                                                             %
  90 %                                                                             %
  91 %                                                                             %
  92 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  93 %
  94 %  IsXWD() returns MagickTrue if the image format type, identified by the
  95 %  magick string, is XWD.
  96 %
  97 %  The format of the IsXWD method is:
  98 %
  99 %      MagickBooleanType IsXWD(const unsigned char *magick,const size_t length)
 100 %
 101 %  A description of each parameter follows:
 102 %
 103 %    o magick: compare image format pattern against these bytes.
 104 %
 105 %    o length: Specifies the length of the magick string.
 106 %
 107 */
 108 static MagickBooleanType IsXWD(const unsigned char *magick,const size_t length)
 109 {
 110   if (length < 8)
 111     return(MagickFalse);
 112   if (memcmp(magick+1,"\000\000",2) == 0)
 113     {
 114       if (memcmp(magick+4,"\007\000\000",3) == 0)
 115         return(MagickTrue);
 116       if (memcmp(magick+5,"\000\000\007",3) == 0)
 117         return(MagickTrue);
 118     }
 119   return(MagickFalse);
 120 }
 121 \f
 122 #if defined(MAGICKCORE_X11_DELEGATE)
 123 /*
 124 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 125 %                                                                             %
 126 %                                                                             %
 127 %                                                                             %
 128 %   R e a d X W D I m a g e                                                   %
 129 %                                                                             %
 130 %                                                                             %
 131 %                                                                             %
 132 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 133 %
 134 %  ReadXWDImage() reads an X Window System window dump image file and
 135 %  returns it.  It allocates the memory necessary for the new Image structure
 136 %  and returns a pointer to the new image.
 137 %
 138 %  The format of the ReadXWDImage method is:
 139 %
 140 %      Image *ReadXWDImage(const ImageInfo *image_info,ExceptionInfo *exception)
 141 %
 142 %  A description of each parameter follows:
 143 %
 144 %    o image_info: the image info.
 145 %
 146 %    o exception: return any errors or warnings in this structure.
 147 %
 148 */
 149
 150 static Image *ReadXWDImage(const ImageInfo *image_info,ExceptionInfo *exception)
 151 {
 152 #define CheckOverflowException(length,width,height) \
 153   (((height) != 0) && ((length)/((size_t) height) != ((size_t) width)))
 154
 155   char
 156     *comment;
 157
 158   Image
 159     *image;
 160
 161   int
 162     x_status;
 163
 164   MagickBooleanType
 165     authentic_colormap;
 166
 167   MagickStatusType
 168     status;
 169
 170   Quantum
 171     index;
 172
 173   register ssize_t
 174     x;
 175
 176   register Quantum
 177     *q;
 178
 179   register ssize_t
 180     i;
 181
 182   register size_t
 183     pixel;
 184
 185   size_t
 186     length;
 187
 188   ssize_t
 189     count,
 190     y;
 191
 192   unsigned long
 193     lsb_first;
 194
 195   XColor
 196     *colors;
 197
 198   XImage
 199     *ximage;
 200
 201   XWDFileHeader
 202     header;
 203
 204   /*
 205     Open image file.
 206   */
 207   assert(image_info != (const ImageInfo *) NULL);
 208   assert(image_info->signature == MagickCoreSignature);
 209   if (image_info->debug != MagickFalse)
 210     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 211       image_info->filename);
 212   assert(exception != (ExceptionInfo *) NULL);
 213   assert(exception->signature == MagickCoreSignature);
 214   image=AcquireImage(image_info,exception);
 215   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 216   if (status == MagickFalse)
 217     {
 218       image=DestroyImageList(image);
 219       return((Image *) NULL);
 220     }
 221   /*
 222      Read in header information.
 223   */
 224   count=ReadBlob(image,sz_XWDheader,(unsigned char *) &header);
 225   if (count != sz_XWDheader)
 226     ThrowReaderException(CorruptImageError,"UnableToReadImageHeader");
 227   /*
 228     Ensure the header byte-order is most-significant byte first.
 229   */
 230   lsb_first=1;
 231   if ((int) (*(char *) &lsb_first) != 0)
 232     MSBOrderLong((unsigned char *) &header,sz_XWDheader);
 233   /*
 234     Check to see if the dump file is in the proper format.
 235   */
 236   if (header.file_version != XWD_FILE_VERSION)
 237     ThrowReaderException(CorruptImageError,"FileFormatVersionMismatch");
 238   if (header.header_size < sz_XWDheader)
 239     ThrowReaderException(CorruptImageError,"CorruptImage");
 240   switch (header.visual_class) {
 241     case StaticGray:
 242     case GrayScale:
 243     case StaticColor:
 244     case PseudoColor:
 245     case TrueColor:
 246     case DirectColor:
 247       break;
 248     default:
 249       ThrowReaderException(CorruptImageError,"CorruptImage");
 250     }
 251   switch (header.pixmap_format) {
 252     case XYBitmap:
 253     case XYPixmap:
 254     case ZPixmap:
 255       break;
 256     default:
 257       ThrowReaderException(CorruptImageError,"CorruptImage");
 258   }
 259   length=(size_t) header.header_size-sz_XWDheader;
 260   comment=(char *) AcquireQuantumMemory(length+1,sizeof(*comment));
 261   if (comment == (char *) NULL)
 262     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 263   count=ReadBlob(image,length,(unsigned char *) comment);
 264   comment[length]='\0';
 265   (void) SetImageProperty(image,"comment",comment,exception);
 266   comment=DestroyString(comment);
 267   if (count != (ssize_t) length)
 268     ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
 269   /*
 270     Initialize the X image.
 271   */
 272   ximage=(XImage *) AcquireMagickMemory(sizeof(*ximage));
 273   if (ximage == (XImage *) NULL)
 274     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 275   ximage->depth=(int) header.pixmap_depth;
 276   ximage->format=(int) header.pixmap_format;
 277   ximage->xoffset=(int) header.xoffset;
 278   ximage->data=(char *) NULL;
 279   ximage->width=(int) header.pixmap_width;
 280   ximage->height=(int) header.pixmap_height;
 281   ximage->bitmap_pad=(int) header.bitmap_pad;
 282   ximage->bytes_per_line=(int) header.bytes_per_line;
 283   ximage->byte_order=(int) header.byte_order;
 284   ximage->bitmap_unit=(int) header.bitmap_unit;
 285   ximage->bitmap_bit_order=(int) header.bitmap_bit_order;
 286   ximage->bits_per_pixel=(int) header.bits_per_pixel;
 287   ximage->red_mask=header.red_mask;
 288   ximage->green_mask=header.green_mask;
 289   ximage->blue_mask=header.blue_mask;
 290   if ((ximage->width < 0) || (ximage->height < 0) || (ximage->depth < 0) ||
 291       (ximage->format < 0) || (ximage->byte_order < 0) ||
 292       (ximage->bitmap_bit_order < 0) || (ximage->bitmap_pad < 0) ||
 293       (ximage->bytes_per_line < 0))
 294     {
 295       ximage=(XImage *) RelinquishMagickMemory(ximage);
 296       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 297     }
 298   if ((ximage->width > 65535) || (ximage->height > 65535))
 299     {
 300       ximage=(XImage *) RelinquishMagickMemory(ximage);
 301       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 302     }
 303   if ((ximage->bits_per_pixel > 32) || (ximage->bitmap_unit > 32))
 304     {
 305       ximage=(XImage *) RelinquishMagickMemory(ximage);
 306       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 307     }
 308   x_status=XInitImage(ximage);
 309   if (x_status == 0)
 310     {
 311       ximage=(XImage *) RelinquishMagickMemory(ximage);
 312       ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
 313     }
 314   /*
 315     Read colormap.
 316   */
 317   authentic_colormap=MagickFalse;
 318   colors=(XColor *) NULL;
 319   if (header.ncolors != 0)
 320     {
 321       XWDColor
 322         color;
 323
 324       length=(size_t) header.ncolors;
 325       colors=(XColor *) AcquireQuantumMemory(length,sizeof(*colors));
 326       if (colors == (XColor *) NULL)
 327         {
 328           ximage=(XImage *) RelinquishMagickMemory(ximage);
 329           ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 330         }
 331       for (i=0; i < (ssize_t) header.ncolors; i++)
 332       {
 333         count=ReadBlob(image,sz_XWDColor,(unsigned char *) &color);
 334         if (count != sz_XWDColor)
 335           {
 336             ximage=(XImage *) RelinquishMagickMemory(ximage);
 337             ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
 338           }
 339         colors[i].pixel=color.pixel;
 340         colors[i].red=color.red;
 341         colors[i].green=color.green;
 342         colors[i].blue=color.blue;
 343         colors[i].flags=(char) color.flags;
 344         if (color.flags != 0)
 345           authentic_colormap=MagickTrue;
 346       }
 347       /*
 348         Ensure the header byte-order is most-significant byte first.
 349       */
 350       lsb_first=1;
 351       if ((int) (*(char *) &lsb_first) != 0)
 352         for (i=0; i < (ssize_t) header.ncolors; i++)
 353         {
 354           MSBOrderLong((unsigned char *) &colors[i].pixel,
 355             sizeof(colors[i].pixel));
 356           MSBOrderShort((unsigned char *) &colors[i].red,3*
 357             sizeof(colors[i].red));
 358         }
 359     }
 360   /*
 361     Allocate the pixel buffer.
 362   */
 363   length=(size_t) ximage->bytes_per_line*ximage->height;
 364   if (CheckOverflowException(length,ximage->bytes_per_line,ximage->height))
 365     {
 366       ximage=(XImage *) RelinquishMagickMemory(ximage);
 367       ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 368     }
 369   if (ximage->format != ZPixmap)
 370     {
 371       size_t
 372         extent;
 373
 374       extent=length;
 375       length*=ximage->depth;
 376       if (CheckOverflowException(length,extent,ximage->depth))
 377         {
 378           ximage=(XImage *) RelinquishMagickMemory(ximage);
 379           ThrowReaderException(CorruptImageError,"ImproperImageHeader");
 380         }
 381     }
 382   ximage->data=(char *) AcquireQuantumMemory(length,sizeof(*ximage->data));
 383   if (ximage->data == (char *) NULL)
 384     {
 385       ximage=(XImage *) RelinquishMagickMemory(ximage);
 386       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 387     }
 388   count=ReadBlob(image,length,(unsigned char *) ximage->data);
 389   if (count != (ssize_t) length)
 390     {
 391       ximage->data=DestroyString(ximage->data);
 392       ximage=(XImage *) RelinquishMagickMemory(ximage);
 393       ThrowReaderException(CorruptImageError,"UnableToReadImageData");
 394     }
 395   /*
 396     Convert image to MIFF format.
 397   */
 398   image->columns=(size_t) ximage->width;
 399   image->rows=(size_t) ximage->height;
 400   image->depth=8;
 401   status=SetImageExtent(image,image->columns,image->rows,exception);
 402   if (status == MagickFalse)
 403     return(DestroyImageList(image));
 404   if ((header.ncolors == 0U) || (ximage->red_mask != 0) ||
 405       (ximage->green_mask != 0) || (ximage->blue_mask != 0))
 406     image->storage_class=DirectClass;
 407   else
 408     image->storage_class=PseudoClass;
 409   image->colors=header.ncolors;
 410   if (image_info->ping == MagickFalse)
 411     switch (image->storage_class)
 412     {
 413       case DirectClass:
 414       default:
 415       {
 416         register size_t
 417           color;
 418
 419         size_t
 420           blue_mask,
 421           blue_shift,
 422           green_mask,
 423           green_shift,
 424           red_mask,
 425           red_shift;
 426
 427         /*
 428           Determine shift and mask for red, green, and blue.
 429         */
 430         red_mask=ximage->red_mask;
 431         red_shift=0;
 432         while ((red_mask != 0) && ((red_mask & 0x01) == 0))
 433         {
 434           red_mask>>=1;
 435           red_shift++;
 436         }
 437         green_mask=ximage->green_mask;
 438         green_shift=0;
 439         while ((green_mask != 0) && ((green_mask & 0x01) == 0))
 440         {
 441           green_mask>>=1;
 442           green_shift++;
 443         }
 444         blue_mask=ximage->blue_mask;
 445         blue_shift=0;
 446         while ((blue_mask != 0) && ((blue_mask & 0x01) == 0))
 447         {
 448           blue_mask>>=1;
 449           blue_shift++;
 450         }
 451         /*
 452           Convert X image to DirectClass packets.
 453         */
 454         if ((image->colors != 0) && (authentic_colormap != MagickFalse))
 455           for (y=0; y < (ssize_t) image->rows; y++)
 456           {
 457             q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 458             if (q == (Quantum *) NULL)
 459               break;
 460             for (x=0; x < (ssize_t) image->columns; x++)
 461             {
 462               pixel=XGetPixel(ximage,(int) x,(int) y);
 463               index=(Quantum) ((pixel >> red_shift) & red_mask);
 464               if (index < header.ncolors)
 465                 SetPixelRed(image,ScaleShortToQuantum(
 466                   colors[(ssize_t) index].red),q);
 467               index=(Quantum) ((pixel >> green_shift) & green_mask);
 468               if (index < header.ncolors)
 469                 SetPixelGreen(image,ScaleShortToQuantum(
 470                   colors[(ssize_t) index].green),q);
 471               index=(Quantum) ((pixel >> blue_shift) & blue_mask);
 472               if (index < header.ncolors)
 473                 SetPixelBlue(image,ScaleShortToQuantum(
 474                   colors[(ssize_t) index].blue),q);
 475               q+=GetPixelChannels(image);
 476             }
 477             if (SyncAuthenticPixels(image,exception) == MagickFalse)
 478               break;
 479             status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 480               image->rows);
 481             if (status == MagickFalse)
 482               break;
 483           }
 484         else
 485           for (y=0; y < (ssize_t) image->rows; y++)
 486           {
 487             q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 488             if (q == (Quantum *) NULL)
 489               break;
 490             for (x=0; x < (ssize_t) image->columns; x++)
 491             {
 492               pixel=XGetPixel(ximage,(int) x,(int) y);
 493               color=(pixel >> red_shift) & red_mask;
 494               if (red_mask != 0)
 495                 color=(color*65535UL)/red_mask;
 496               SetPixelRed(image,ScaleShortToQuantum((unsigned short) color),q);
 497               color=(pixel >> green_shift) & green_mask;
 498               if (green_mask != 0)
 499                 color=(color*65535UL)/green_mask;
 500               SetPixelGreen(image,ScaleShortToQuantum((unsigned short) color),
 501                 q);
 502               color=(pixel >> blue_shift) & blue_mask;
 503               if (blue_mask != 0)
 504                 color=(color*65535UL)/blue_mask;
 505               SetPixelBlue(image,ScaleShortToQuantum((unsigned short) color),q);
 506               q+=GetPixelChannels(image);
 507             }
 508             if (SyncAuthenticPixels(image,exception) == MagickFalse)
 509               break;
 510             status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 511               image->rows);
 512             if (status == MagickFalse)
 513               break;
 514           }
 515         break;
 516       }
 517       case PseudoClass:
 518       {
 519         /*
 520           Convert X image to PseudoClass packets.
 521         */
 522         if (AcquireImageColormap(image,image->colors,exception) == MagickFalse)
 523           {
 524             ximage->data=DestroyString(ximage->data);
 525             ximage=(XImage *) RelinquishMagickMemory(ximage);
 526             ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 527           }
 528         for (i=0; i < (ssize_t) image->colors; i++)
 529         {
 530           image->colormap[i].red=(MagickRealType) ScaleShortToQuantum(
 531             colors[i].red);
 532           image->colormap[i].green=(MagickRealType) ScaleShortToQuantum(
 533             colors[i].green);
 534           image->colormap[i].blue=(MagickRealType) ScaleShortToQuantum(
 535             colors[i].blue);
 536         }
 537         for (y=0; y < (ssize_t) image->rows; y++)
 538         {
 539           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 540           if (q == (Quantum *) NULL)
 541             break;
 542           for (x=0; x < (ssize_t) image->columns; x++)
 543           {
 544             index=ConstrainColormapIndex(image,XGetPixel(ximage,(int) x,
 545               (int) y),exception);
 546             SetPixelIndex(image,index,q);
 547             SetPixelViaPixelInfo(image,image->colormap+(ssize_t) index,q);
 548             q+=GetPixelChannels(image);
 549           }
 550           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 551             break;
 552           status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 553             image->rows);
 554           if (status == MagickFalse)
 555             break;
 556         }
 557         break;
 558       }
 559     }
 560   /*
 561     Free image and colormap.
 562   */
 563   if (header.ncolors != 0)
 564     colors=(XColor *) RelinquishMagickMemory(colors);
 565   ximage->data=DestroyString(ximage->data);
 566   ximage=(XImage *) RelinquishMagickMemory(ximage);
 567   if (EOFBlob(image) != MagickFalse)
 568     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
 569       image->filename);
 570   (void) CloseBlob(image);
 571   return(GetFirstImageInList(image));
 572 }
 573 #endif
 574 \f
 575 /*
 576 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 577 %                                                                             %
 578 %                                                                             %
 579 %                                                                             %
 580 %   R e g i s t e r X W D I m a g e                                           %
 581 %                                                                             %
 582 %                                                                             %
 583 %                                                                             %
 584 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 585 %
 586 %  RegisterXWDImage() adds properties for the XWD image format to
 587 %  the list of supported formats.  The properties include the image format
 588 %  tag, a method to read and/or write the format, whether the format
 589 %  supports the saving of more than one frame to the same file or blob,
 590 %  whether the format supports native in-memory I/O, and a brief
 591 %  description of the format.
 592 %
 593 %  The format of the RegisterXWDImage method is:
 594 %
 595 %      size_t RegisterXWDImage(void)
 596 %
 597 */
 598 ModuleExport size_t RegisterXWDImage(void)
 599 {
 600   MagickInfo
 601     *entry;
 602
 603   entry=AcquireMagickInfo("XWD","XWD","X Windows system window dump (color)");
 604 #if defined(MAGICKCORE_X11_DELEGATE)
 605   entry->decoder=(DecodeImageHandler *) ReadXWDImage;
 606   entry->encoder=(EncodeImageHandler *) WriteXWDImage;
 607 #endif
 608   entry->magick=(IsImageFormatHandler *) IsXWD;
 609   entry->flags^=CoderAdjoinFlag;
 610   (void) RegisterMagickInfo(entry);
 611   return(MagickImageCoderSignature);
 612 }
 613 \f
 614 /*
 615 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 616 %                                                                             %
 617 %                                                                             %
 618 %                                                                             %
 619 %   U n r e g i s t e r X W D I m a g e                                       %
 620 %                                                                             %
 621 %                                                                             %
 622 %                                                                             %
 623 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 624 %
 625 %  UnregisterXWDImage() removes format registrations made by the
 626 %  XWD module from the list of supported formats.
 627 %
 628 %  The format of the UnregisterXWDImage method is:
 629 %
 630 %      UnregisterXWDImage(void)
 631 %
 632 */
 633 ModuleExport void UnregisterXWDImage(void)
 634 {
 635   (void) UnregisterMagickInfo("XWD");
 636 }
 637 \f
 638 #if defined(MAGICKCORE_X11_DELEGATE)
 639 /*
 640 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 641 %                                                                             %
 642 %                                                                             %
 643 %                                                                             %
 644 %   W r i t e X W D I m a g e                                                 %
 645 %                                                                             %
 646 %                                                                             %
 647 %                                                                             %
 648 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 649 %
 650 %  WriteXWDImage() writes an image to a file in X window dump
 651 %  rasterfile format.
 652 %
 653 %  The format of the WriteXWDImage method is:
 654 %
 655 %      MagickBooleanType WriteXWDImage(const ImageInfo *image_info,
 656 %        Image *image,ExceptionInfo *exception)
 657 %
 658 %  A description of each parameter follows.
 659 %
 660 %    o image_info: the image info.
 661 %
 662 %    o image:  The image.
 663 %
 664 %    o exception: return any errors or warnings in this structure.
 665 %
 666 */
 667 static MagickBooleanType WriteXWDImage(const ImageInfo *image_info,Image *image,
 668   ExceptionInfo *exception)
 669 {
 670   const char
 671     *value;
 672
 673   MagickBooleanType
 674     status;
 675
 676   register const Quantum
 677     *p;
 678
 679   register ssize_t
 680     x;
 681
 682   register unsigned char
 683     *q;
 684
 685   size_t
 686     bits_per_pixel,
 687     bytes_per_line,
 688     length,
 689     scanline_pad;
 690
 691   ssize_t
 692     y;
 693
 694   unsigned char
 695     *pixels;
 696
 697   unsigned long
 698     lsb_first;
 699
 700   XWDFileHeader
 701     xwd_info;
 702
 703   /*
 704     Open output image file.
 705   */
 706   assert(image_info != (const ImageInfo *) NULL);
 707   assert(image_info->signature == MagickCoreSignature);
 708   assert(image != (Image *) NULL);
 709   assert(image->signature == MagickCoreSignature);
 710   if (image->debug != MagickFalse)
 711     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 712   assert(exception != (ExceptionInfo *) NULL);
 713   assert(exception->signature == MagickCoreSignature);
 714   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 715   if (status == MagickFalse)
 716     return(status);
 717   (void) TransformImageColorspace(image,sRGBColorspace,exception);
 718   /*
 719     Initialize XWD file header.
 720   */
 721   (void) ResetMagickMemory(&xwd_info,0,sizeof(xwd_info));
 722   xwd_info.header_size=(CARD32) sz_XWDheader;
 723   value=GetImageProperty(image,"comment",exception);
 724   if (value != (const char *) NULL)
 725     xwd_info.header_size+=(CARD32) strlen(value);
 726   xwd_info.header_size++;
 727   xwd_info.file_version=(CARD32) XWD_FILE_VERSION;
 728   xwd_info.pixmap_format=(CARD32) ZPixmap;
 729   xwd_info.pixmap_depth=(CARD32) (image->storage_class == DirectClass ? 24 : 8);
 730   xwd_info.pixmap_width=(CARD32) image->columns;
 731   xwd_info.pixmap_height=(CARD32) image->rows;
 732   xwd_info.xoffset=(CARD32) 0;
 733   xwd_info.byte_order=(CARD32) MSBFirst;
 734   xwd_info.bitmap_unit=(CARD32) (image->storage_class == DirectClass ? 32 : 8);
 735   xwd_info.bitmap_bit_order=(CARD32) MSBFirst;
 736   xwd_info.bitmap_pad=(CARD32) (image->storage_class == DirectClass ? 32 : 8);
 737   bits_per_pixel=(size_t) (image->storage_class == DirectClass ? 24 : 8);
 738   xwd_info.bits_per_pixel=(CARD32) bits_per_pixel;
 739   bytes_per_line=(CARD32) ((((xwd_info.bits_per_pixel*
 740     xwd_info.pixmap_width)+((xwd_info.bitmap_pad)-1))/
 741     (xwd_info.bitmap_pad))*((xwd_info.bitmap_pad) >> 3));
 742   xwd_info.bytes_per_line=(CARD32) bytes_per_line;
 743   xwd_info.visual_class=(CARD32)
 744     (image->storage_class == DirectClass ? DirectColor : PseudoColor);
 745   xwd_info.red_mask=(CARD32)
 746     (image->storage_class == DirectClass ? 0xff0000 : 0);
 747   xwd_info.green_mask=(CARD32)
 748     (image->storage_class == DirectClass ? 0xff00 : 0);
 749   xwd_info.blue_mask=(CARD32) (image->storage_class == DirectClass ? 0xff : 0);
 750   xwd_info.bits_per_rgb=(CARD32) (image->storage_class == DirectClass ? 24 : 8);
 751   xwd_info.colormap_entries=(CARD32)
 752     (image->storage_class == DirectClass ? 256 : image->colors);
 753   xwd_info.ncolors=(unsigned int)
 754     (image->storage_class == DirectClass ? 0 : image->colors);
 755   xwd_info.window_width=(CARD32) image->columns;
 756   xwd_info.window_height=(CARD32) image->rows;
 757   xwd_info.window_x=0;
 758   xwd_info.window_y=0;
 759   xwd_info.window_bdrwidth=(CARD32) 0;
 760   /*
 761     Write XWD header.
 762   */
 763   lsb_first=1;
 764   if ((int) (*(char *) &lsb_first) != 0)
 765     MSBOrderLong((unsigned char *) &xwd_info,sizeof(xwd_info));
 766   (void) WriteBlob(image,sz_XWDheader,(unsigned char *) &xwd_info);
 767   if (value != (const char *) NULL)
 768     (void) WriteBlob(image,strlen(value),(unsigned char *) value);
 769   (void) WriteBlob(image,1,(const unsigned char *) "\0");
 770   if (image->storage_class == PseudoClass)
 771     {
 772       register ssize_t
 773         i;
 774
 775       XColor
 776         *colors;
 777
 778       XWDColor
 779         color;
 780
 781       /*
 782         Dump colormap to file.
 783       */
 784       (void) ResetMagickMemory(&color,0,sizeof(color));
 785       colors=(XColor *) AcquireQuantumMemory((size_t) image->colors,
 786         sizeof(*colors));
 787       if (colors == (XColor *) NULL)
 788         ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 789       for (i=0; i < (ssize_t) image->colors; i++)
 790       {
 791         colors[i].pixel=(unsigned long) i;
 792         colors[i].red=ScaleQuantumToShort(ClampToQuantum(
 793           image->colormap[i].red));
 794         colors[i].green=ScaleQuantumToShort(ClampToQuantum(
 795           image->colormap[i].green));
 796         colors[i].blue=ScaleQuantumToShort(ClampToQuantum(
 797           image->colormap[i].blue));
 798         colors[i].flags=(char) (DoRed | DoGreen | DoBlue);
 799         colors[i].pad='\0';
 800         if ((int) (*(char *) &lsb_first) != 0)
 801           {
 802             MSBOrderLong((unsigned char *) &colors[i].pixel,
 803               sizeof(colors[i].pixel));
 804             MSBOrderShort((unsigned char *) &colors[i].red,
 805               3*sizeof(colors[i].red));
 806           }
 807       }
 808       for (i=0; i < (ssize_t) image->colors; i++)
 809       {
 810         color.pixel=(CARD32) colors[i].pixel;
 811         color.red=colors[i].red;
 812         color.green=colors[i].green;
 813         color.blue=colors[i].blue;
 814         color.flags=(CARD8) colors[i].flags;
 815         (void) WriteBlob(image,sz_XWDColor,(unsigned char *) &color);
 816       }
 817       colors=(XColor *) RelinquishMagickMemory(colors);
 818     }
 819   /*
 820     Allocate memory for pixels.
 821   */
 822   length=3*bytes_per_line;
 823   if (image->storage_class == PseudoClass)
 824     length=bytes_per_line;
 825   pixels=(unsigned char *) AcquireQuantumMemory(length,sizeof(*pixels));
 826   if (pixels == (unsigned char *) NULL)
 827     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 828   (void) ResetMagickMemory(pixels,0,length);
 829   /*
 830     Convert MIFF to XWD raster pixels.
 831   */
 832   scanline_pad=(bytes_per_line-((image->columns*bits_per_pixel) >> 3));
 833   for (y=0; y < (ssize_t) image->rows; y++)
 834   {
 835     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 836     if (p == (const Quantum *) NULL)
 837       break;
 838     q=pixels;
 839     if (image->storage_class == PseudoClass)
 840       {
 841         for (x=0; x < (ssize_t) image->columns; x++)
 842         {
 843           *q++=(unsigned char) GetPixelIndex(image,p);
 844           p+=GetPixelChannels(image);
 845         }
 846       }
 847     else
 848       for (x=0; x < (ssize_t) image->columns; x++)
 849       {
 850         *q++=ScaleQuantumToChar(GetPixelRed(image,p));
 851         *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
 852         *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
 853         p+=GetPixelChannels(image);
 854       }
 855     for (x=0; x < (ssize_t) scanline_pad; x++)
 856       *q++='\0';
 857     (void) WriteBlob(image,(size_t) (q-pixels),pixels);
 858     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 859       image->rows);
 860     if (status == MagickFalse)
 861       break;
 862   }
 863   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 864   (void) CloseBlob(image);
 865   return(MagickTrue);
 866 }
 867 #endif