granicus.if.org Git - imagemagick/blob - MagickCore/channel.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %               CCCC  H   H   AAA   N   N  N   N  EEEEE   L                   %
   7 %              C      H   H  A   A  NN  N  NN  N  E       L                   %
   8 %              C      HHHHH  AAAAA  N N N  N N N  EEE     L                   %
   9 %              C      H   H  A   A  N  NN  N  NN  E       L                   %
  10 %               CCCC  H   H  A   A  N   N  N   N  EEEEE   LLLLL               %
  11 %                                                                             %
  12 %                                                                             %
  13 %                      MagickCore Image Channel Methods                       %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                   Cristy                                    %
  17 %                               December 2003                                 %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2018 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 %    https://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 */
  39
  40 /*
  41   Include declarations.
  42 */
  43 #include "MagickCore/studio.h"
  44 #include "MagickCore/cache-private.h"
  45 #include "MagickCore/channel.h"
  46 #include "MagickCore/colorspace-private.h"
  47 #include "MagickCore/composite-private.h"
  48 #include "MagickCore/enhance.h"
  49 #include "MagickCore/image.h"
  50 #include "MagickCore/list.h"
  51 #include "MagickCore/log.h"
  52 #include "MagickCore/monitor.h"
  53 #include "MagickCore/monitor-private.h"
  54 #include "MagickCore/option.h"
  55 #include "MagickCore/pixel-accessor.h"
  56 #include "MagickCore/pixel-private.h"
  57 #include "MagickCore/resource_.h"
  58 #include "MagickCore/string-private.h"
  59 #include "MagickCore/thread-private.h"
  60 #include "MagickCore/token.h"
  61 #include "MagickCore/utility.h"
  62 #include "MagickCore/version.h"
  63 \f
  64 /*
  65 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  66 %                                                                             %
  67 %                                                                             %
  68 %                                                                             %
  69 %     C h a n n e l F x I m a g e                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %                                                                             %
  73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  74 %
  75 %  ChannelFxImage() applies a channel expression to the specified image.  The
  76 %  expression consists of one or more channels, either mnemonic or numeric (e.g.
  77 %  red, 1), separated by actions as follows:
  78 %
  79 %    <=>     exchange two channels (e.g. red<=>blue)
  80 %    =>      copy one channel to another channel (e.g. red=>green)
  81 %    =       assign a constant value to a channel (e.g. red=50%)
  82 %    ,       write new image channels in the specified order (e.g. red, green)
  83 %    |       add a new output image for the next set of channel operations
  84 %    ;       move to the next input image for the source of channel data
  85 %
  86 %  For example, to create 3 grayscale images from the red, green, and blue
  87 %  channels of an image, use:
  88 %
  89 %    -channel-fx "red; green; blue"
  90 %
  91 %  A channel without an operation symbol implies separate (i.e, semicolon).
  92 %
  93 %  The format of the ChannelFxImage method is:
  94 %
  95 %      Image *ChannelFxImage(const Image *image,const char *expression,
  96 %        ExceptionInfo *exception)
  97 %
  98 %  A description of each parameter follows:
  99 %
 100 %    o image: the image.
 101 %
 102 %    o expression: A channel expression.
 103 %
 104 %    o exception: return any errors or warnings in this structure.
 105 %
 106 */
 107
 108 typedef enum
 109 {
 110   ExtractChannelOp,
 111   AssignChannelOp,
 112   ExchangeChannelOp,
 113   TransferChannelOp
 114 } ChannelFx;
 115
 116 static MagickBooleanType ChannelImage(Image *destination_image,
 117   const PixelChannel destination_channel,const ChannelFx channel_op,
 118   const Image *source_image,const PixelChannel source_channel,
 119   const Quantum pixel,ExceptionInfo *exception)
 120 {
 121   CacheView
 122     *source_view,
 123     *destination_view;
 124
 125   MagickBooleanType
 126     status;
 127
 128   size_t
 129     height,
 130     width;
 131
 132   ssize_t
 133     y;
 134
 135   status=MagickTrue;
 136   source_view=AcquireVirtualCacheView(source_image,exception);
 137   destination_view=AcquireAuthenticCacheView(destination_image,exception);
 138   height=MagickMin(source_image->rows,destination_image->rows);
 139   width=MagickMin(source_image->columns,destination_image->columns);
 140 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 141   #pragma omp parallel for schedule(static) shared(status) \
 142     magick_number_threads(source_image,source_image,height,1)
 143 #endif
 144   for (y=0; y < (ssize_t) height; y++)
 145   {
 146     PixelTrait
 147       destination_traits,
 148       source_traits;
 149
 150     register const Quantum
 151       *magick_restrict p;
 152
 153     register Quantum
 154       *magick_restrict q;
 155
 156     register ssize_t
 157       x;
 158
 159     if (status == MagickFalse)
 160       continue;
 161     p=GetCacheViewVirtualPixels(source_view,0,y,source_image->columns,1,
 162       exception);
 163     q=GetCacheViewAuthenticPixels(destination_view,0,y,
 164       destination_image->columns,1,exception);
 165     if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
 166       {
 167         status=MagickFalse;
 168         continue;
 169       }
 170     destination_traits=GetPixelChannelTraits(destination_image,
 171       destination_channel);
 172     source_traits=GetPixelChannelTraits(source_image,source_channel);
 173     if ((destination_traits == UndefinedPixelTrait) ||
 174         (source_traits == UndefinedPixelTrait))
 175       continue;
 176     for (x=0; x < (ssize_t) width; x++)
 177     {
 178       if (channel_op == AssignChannelOp)
 179         SetPixelChannel(destination_image,destination_channel,pixel,q);
 180       else
 181         SetPixelChannel(destination_image,destination_channel,
 182           GetPixelChannel(source_image,source_channel,p),q);
 183       p+=GetPixelChannels(source_image);
 184       q+=GetPixelChannels(destination_image);
 185     }
 186     if (SyncCacheViewAuthenticPixels(destination_view,exception) == MagickFalse)
 187       status=MagickFalse;
 188   }
 189   destination_view=DestroyCacheView(destination_view);
 190   source_view=DestroyCacheView(source_view);
 191   return(status);
 192 }
 193
 194 MagickExport Image *ChannelFxImage(const Image *image,const char *expression,
 195   ExceptionInfo *exception)
 196 {
 197 #define ChannelFxImageTag  "ChannelFx/Image"
 198
 199   ChannelFx
 200     channel_op;
 201
 202   ChannelType
 203     channel_mask;
 204
 205   char
 206     token[MagickPathExtent];
 207
 208   const char
 209     *p;
 210
 211   const Image
 212     *source_image;
 213
 214   double
 215     pixel;
 216
 217   Image
 218     *destination_image;
 219
 220   MagickBooleanType
 221     status;
 222
 223   PixelChannel
 224     source_channel,
 225     destination_channel;
 226
 227   ssize_t
 228     channels;
 229
 230   assert(image != (Image *) NULL);
 231   assert(image->signature == MagickCoreSignature);
 232   if (image->debug != MagickFalse)
 233     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 234   assert(exception != (ExceptionInfo *) NULL);
 235   assert(exception->signature == MagickCoreSignature);
 236   source_image=image;
 237   destination_image=CloneImage(source_image,0,0,MagickTrue,exception);
 238   if (destination_image == (Image *) NULL)
 239     return((Image *) NULL);
 240   if (expression == (const char *) NULL)
 241     return(destination_image);
 242   status=SetImageStorageClass(destination_image,DirectClass,exception);
 243   if (status == MagickFalse)
 244     {
 245       destination_image=GetLastImageInList(destination_image);
 246       return((Image *) NULL);
 247     }
 248   destination_channel=RedPixelChannel;
 249   channel_mask=UndefinedChannel;
 250   pixel=0.0;
 251   p=(char *) expression;
 252   GetNextToken(p,&p,MagickPathExtent,token);
 253   channel_op=ExtractChannelOp;
 254   for (channels=0; *token != '\0'; )
 255   {
 256     ssize_t
 257       i;
 258
 259     /*
 260       Interpret channel expression.
 261     */
 262     switch (*token)
 263     {
 264       case ',':
 265       {
 266         GetNextToken(p,&p,MagickPathExtent,token);
 267         break;
 268       }
 269       case '|':
 270       {
 271         if (GetNextImageInList(source_image) != (Image *) NULL)
 272           source_image=GetNextImageInList(source_image);
 273         else
 274           source_image=GetFirstImageInList(source_image);
 275         GetNextToken(p,&p,MagickPathExtent,token);
 276         break;
 277       }
 278       case ';':
 279       {
 280         Image
 281           *canvas;
 282
 283         (void) SetPixelChannelMask(destination_image,channel_mask);
 284         if ((channel_op == ExtractChannelOp) && (channels == 1))
 285           {
 286             (void) SetPixelMetaChannels(destination_image,0,exception);
 287             (void) SetImageColorspace(destination_image,GRAYColorspace,
 288               exception);
 289           }
 290         canvas=CloneImage(source_image,0,0,MagickTrue,exception);
 291         if (canvas == (Image *) NULL)
 292           {
 293             destination_image=DestroyImageList(destination_image);
 294             return(destination_image);
 295           }
 296         AppendImageToList(&destination_image,canvas);
 297         destination_image=GetLastImageInList(destination_image);
 298         status=SetImageStorageClass(destination_image,DirectClass,exception);
 299         if (status == MagickFalse)
 300           {
 301             destination_image=GetLastImageInList(destination_image);
 302             return((Image *) NULL);
 303           }
 304         GetNextToken(p,&p,MagickPathExtent,token);
 305         channels=0;
 306         destination_channel=RedPixelChannel;
 307         channel_mask=UndefinedChannel;
 308         break;
 309       }
 310       default:
 311         break;
 312     }
 313     i=ParsePixelChannelOption(token);
 314     if (i < 0)
 315       {
 316         (void) ThrowMagickException(exception,GetMagickModule(),OptionError,
 317           "UnrecognizedChannelType","`%s'",token);
 318         destination_image=DestroyImageList(destination_image);
 319         return(destination_image);
 320       }
 321     source_channel=(PixelChannel) i;
 322     channel_op=ExtractChannelOp;
 323     GetNextToken(p,&p,MagickPathExtent,token);
 324     if (*token == '<')
 325       {
 326         channel_op=ExchangeChannelOp;
 327         GetNextToken(p,&p,MagickPathExtent,token);
 328       }
 329     if (*token == '=')
 330       {
 331         if (channel_op != ExchangeChannelOp)
 332           channel_op=AssignChannelOp;
 333         GetNextToken(p,&p,MagickPathExtent,token);
 334       }
 335     if (*token == '>')
 336       {
 337         if (channel_op != ExchangeChannelOp)
 338           channel_op=TransferChannelOp;
 339         GetNextToken(p,&p,MagickPathExtent,token);
 340       }
 341     switch (channel_op)
 342     {
 343       case AssignChannelOp:
 344       case ExchangeChannelOp:
 345       case TransferChannelOp:
 346       {
 347         if (channel_op == AssignChannelOp)
 348           pixel=StringToDoubleInterval(token,(double) QuantumRange+1.0);
 349         else
 350           {
 351             i=ParsePixelChannelOption(token);
 352             if (i < 0)
 353               {
 354                 (void) ThrowMagickException(exception,GetMagickModule(),
 355                   OptionError,"UnrecognizedChannelType","`%s'",token);
 356                 destination_image=DestroyImageList(destination_image);
 357                 return(destination_image);
 358               }
 359           }
 360         destination_channel=(PixelChannel) i;
 361         if (i >= (ssize_t) GetPixelChannels(destination_image))
 362           (void) SetPixelMetaChannels(destination_image,(size_t) (
 363             destination_channel-GetPixelChannels(destination_image)+1),
 364             exception);
 365         if (image->colorspace != UndefinedColorspace)
 366           switch (destination_channel)
 367           {
 368             case RedPixelChannel:
 369             case GreenPixelChannel:
 370             case BluePixelChannel:
 371             case BlackPixelChannel:
 372             case IndexPixelChannel:
 373               break;
 374             case AlphaPixelChannel:
 375             {
 376               destination_image->alpha_trait=BlendPixelTrait;
 377               break;
 378             }
 379             case CompositeMaskPixelChannel:
 380             {
 381               destination_image->channels=(ChannelType)
 382                 (destination_image->channels | CompositeMaskChannel);
 383               break;
 384             }
 385             case ReadMaskPixelChannel:
 386             {
 387               destination_image->channels=(ChannelType)
 388                 (destination_image->channels | ReadMaskChannel);
 389               break;
 390             }
 391             case WriteMaskPixelChannel:
 392             {
 393               destination_image->channels=(ChannelType)
 394                 (destination_image->channels | WriteMaskChannel);
 395               break;
 396             }
 397             case MetaPixelChannel:
 398             default:
 399             {
 400               (void) SetPixelMetaChannels(destination_image,(size_t) (
 401                 destination_channel-GetPixelChannels(destination_image)+1),
 402                 exception);
 403               break;
 404             }
 405           }
 406         channel_mask=(ChannelType) (channel_mask | ParseChannelOption(token));
 407         if (((channels >= 1)  || (destination_channel >= 1)) &&
 408             (IsGrayColorspace(destination_image->colorspace) != MagickFalse))
 409           (void) SetImageColorspace(destination_image,sRGBColorspace,exception);
 410         GetNextToken(p,&p,MagickPathExtent,token);
 411         break;
 412       }
 413       default:
 414         break;
 415     }
 416     status=ChannelImage(destination_image,destination_channel,channel_op,
 417       source_image,source_channel,ClampToQuantum(pixel),exception);
 418     if (status == MagickFalse)
 419       {
 420         destination_image=DestroyImageList(destination_image);
 421         break;
 422       }
 423     channels++;
 424     if (channel_op == ExchangeChannelOp)
 425       {
 426         status=ChannelImage(destination_image,source_channel,channel_op,
 427           source_image,destination_channel,ClampToQuantum(pixel),exception);
 428         if (status == MagickFalse)
 429           {
 430             destination_image=DestroyImageList(destination_image);
 431             break;
 432           }
 433         channels++;
 434       }
 435     switch (channel_op)
 436     {
 437       case ExtractChannelOp:
 438       {
 439         channel_mask=(ChannelType) (channel_mask |
 440           (1UL << destination_channel));
 441         destination_channel=(PixelChannel) (destination_channel+1);
 442         break;
 443       }
 444       default:
 445         break;
 446     }
 447     status=SetImageProgress(source_image,ChannelFxImageTag,p-expression,
 448       strlen(expression));
 449     if (status == MagickFalse)
 450       break;
 451   }
 452   (void) SetPixelChannelMask(destination_image,channel_mask);
 453   if ((channel_op == ExtractChannelOp) && (channels == 1))
 454     {
 455       (void) SetPixelMetaChannels(destination_image,0,exception);
 456       (void) SetImageColorspace(destination_image,GRAYColorspace,exception);
 457     }
 458   return(GetFirstImageInList(destination_image));
 459 }
 460 \f
 461 /*
 462 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 463 %                                                                             %
 464 %                                                                             %
 465 %                                                                             %
 466 %     C o m b i n e I m a g e s                                               %
 467 %                                                                             %
 468 %                                                                             %
 469 %                                                                             %
 470 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 471 %
 472 %  CombineImages() combines one or more images into a single image.  The
 473 %  grayscale value of the pixels of each image in the sequence is assigned in
 474 %  order to the specified channels of the combined image.   The typical
 475 %  ordering would be image 1 => Red, 2 => Green, 3 => Blue, etc.
 476 %
 477 %  The format of the CombineImages method is:
 478 %
 479 %      Image *CombineImages(const Image *images,const ColorspaceType colorspace,
 480 %        ExceptionInfo *exception)
 481 %
 482 %  A description of each parameter follows:
 483 %
 484 %    o images: the image sequence.
 485 %
 486 %    o colorspace: the image colorspace.
 487 %
 488 %    o exception: return any errors or warnings in this structure.
 489 %
 490 */
 491 MagickExport Image *CombineImages(const Image *image,
 492   const ColorspaceType colorspace,ExceptionInfo *exception)
 493 {
 494 #define CombineImageTag  "Combine/Image"
 495
 496   CacheView
 497     *combine_view;
 498
 499   Image
 500     *combine_image;
 501
 502   MagickBooleanType
 503     status;
 504
 505   MagickOffsetType
 506     progress;
 507
 508   ssize_t
 509     y;
 510
 511   /*
 512     Ensure the image are the same size.
 513   */
 514   assert(image != (const Image *) NULL);
 515   assert(image->signature == MagickCoreSignature);
 516   if (image->debug != MagickFalse)
 517     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 518   assert(exception != (ExceptionInfo *) NULL);
 519   assert(exception->signature == MagickCoreSignature);
 520   combine_image=CloneImage(image,0,0,MagickTrue,exception);
 521   if (combine_image == (Image *) NULL)
 522     return((Image *) NULL);
 523   if (SetImageStorageClass(combine_image,DirectClass,exception) == MagickFalse)
 524     {
 525       combine_image=DestroyImage(combine_image);
 526       return((Image *) NULL);
 527     }
 528   if (colorspace != UndefinedColorspace)
 529     (void) SetImageColorspace(combine_image,colorspace,exception);
 530   else
 531     if (fabs(image->gamma-1.0) <= MagickEpsilon)
 532       (void) SetImageColorspace(combine_image,RGBColorspace,exception);
 533     else
 534       (void) SetImageColorspace(combine_image,sRGBColorspace,exception);
 535   switch (combine_image->colorspace)
 536   {
 537     case UndefinedColorspace:
 538     case sRGBColorspace:
 539     {
 540       if (GetImageListLength(image) > 3)
 541         combine_image->alpha_trait=BlendPixelTrait;
 542       break;
 543     }
 544     case LinearGRAYColorspace:
 545     case GRAYColorspace:
 546     {
 547       if (GetImageListLength(image) > 1)
 548         combine_image->alpha_trait=BlendPixelTrait;
 549       break;
 550     }
 551     case CMYKColorspace:
 552     {
 553       if (GetImageListLength(image) > 4)
 554         combine_image->alpha_trait=BlendPixelTrait;
 555       break;
 556     }
 557     default:
 558       break;
 559   }
 560   /*
 561     Combine images.
 562   */
 563   status=MagickTrue;
 564   progress=0;
 565   combine_view=AcquireAuthenticCacheView(combine_image,exception);
 566   for (y=0; y < (ssize_t) combine_image->rows; y++)
 567   {
 568     CacheView
 569       *image_view;
 570
 571     const Image
 572       *next;
 573
 574     Quantum
 575       *pixels;
 576
 577     register const Quantum
 578       *magick_restrict p;
 579
 580     register Quantum
 581       *magick_restrict q;
 582
 583     register ssize_t
 584       i;
 585
 586     if (status == MagickFalse)
 587       continue;
 588     pixels=GetCacheViewAuthenticPixels(combine_view,0,y,combine_image->columns,
 589       1,exception);
 590     if (pixels == (Quantum *) NULL)
 591       {
 592         status=MagickFalse;
 593         continue;
 594       }
 595     next=image;
 596     for (i=0; i < (ssize_t) GetPixelChannels(combine_image); i++)
 597     {
 598       register ssize_t
 599         x;
 600
 601       PixelChannel channel = GetPixelChannelChannel(combine_image,i);
 602       PixelTrait traits = GetPixelChannelTraits(combine_image,channel);
 603       if (traits == UndefinedPixelTrait)
 604         continue;
 605       if (next == (Image *) NULL)
 606         continue;
 607       image_view=AcquireVirtualCacheView(next,exception);
 608       p=GetCacheViewVirtualPixels(image_view,0,y,next->columns,1,exception);
 609       if (p == (const Quantum *) NULL)
 610         continue;
 611       q=pixels;
 612       for (x=0; x < (ssize_t) combine_image->columns; x++)
 613       {
 614         if (x < (ssize_t) next->columns)
 615           {
 616             q[i]=GetPixelGray(next,p);
 617             p+=GetPixelChannels(next);
 618           }
 619         q+=GetPixelChannels(combine_image);
 620       }
 621       image_view=DestroyCacheView(image_view);
 622       next=GetNextImageInList(next);
 623     }
 624     if (SyncCacheViewAuthenticPixels(combine_view,exception) == MagickFalse)
 625       status=MagickFalse;
 626     if (image->progress_monitor != (MagickProgressMonitor) NULL)
 627       {
 628         MagickBooleanType
 629           proceed;
 630
 631         proceed=SetImageProgress(image,CombineImageTag,progress++,
 632           combine_image->rows);
 633         if (proceed == MagickFalse)
 634           status=MagickFalse;
 635       }
 636   }
 637   combine_view=DestroyCacheView(combine_view);
 638   if (status == MagickFalse)
 639     combine_image=DestroyImage(combine_image);
 640   return(combine_image);
 641 }
 642 \f
 643 /*
 644 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 645 %                                                                             %
 646 %                                                                             %
 647 %                                                                             %
 648 %   G e t I m a g e A l p h a C h a n n e l                                   %
 649 %                                                                             %
 650 %                                                                             %
 651 %                                                                             %
 652 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 653 %
 654 %  GetImageAlphaChannel() returns MagickFalse if the image alpha channel is
 655 %  not activated.  That is, the image is RGB rather than RGBA or CMYK rather
 656 %  than CMYKA.
 657 %
 658 %  The format of the GetImageAlphaChannel method is:
 659 %
 660 %      MagickBooleanType GetImageAlphaChannel(const Image *image)
 661 %
 662 %  A description of each parameter follows:
 663 %
 664 %    o image: the image.
 665 %
 666 */
 667 MagickExport MagickBooleanType GetImageAlphaChannel(const Image *image)
 668 {
 669   assert(image != (const Image *) NULL);
 670   if (image->debug != MagickFalse)
 671     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 672   assert(image->signature == MagickCoreSignature);
 673   return(image->alpha_trait != UndefinedPixelTrait ? MagickTrue : MagickFalse);
 674 }
 675 \f
 676 /*
 677 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 678 %                                                                             %
 679 %                                                                             %
 680 %                                                                             %
 681 %     S e p a r a t e I m a g e                                               %
 682 %                                                                             %
 683 %                                                                             %
 684 %                                                                             %
 685 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 686 %
 687 %  SeparateImage() separates a channel from the image and returns it as a
 688 %  grayscale image.
 689 %
 690 %  The format of the SeparateImage method is:
 691 %
 692 %      Image *SeparateImage(const Image *image,const ChannelType channel,
 693 %        ExceptionInfo *exception)
 694 %
 695 %  A description of each parameter follows:
 696 %
 697 %    o image: the image.
 698 %
 699 %    o channel: the image channel.
 700 %
 701 %    o exception: return any errors or warnings in this structure.
 702 %
 703 */
 704 MagickExport Image *SeparateImage(const Image *image,
 705   const ChannelType channel_type,ExceptionInfo *exception)
 706 {
 707 #define GetChannelBit(mask,bit)  (((size_t) (mask) >> (size_t) (bit)) & 0x01)
 708 #define SeparateImageTag  "Separate/Image"
 709
 710   CacheView
 711     *image_view,
 712     *separate_view;
 713
 714   Image
 715     *separate_image;
 716
 717   MagickBooleanType
 718     status;
 719
 720   MagickOffsetType
 721     progress;
 722
 723   ssize_t
 724     y;
 725
 726   /*
 727     Initialize separate image attributes.
 728   */
 729   assert(image != (Image *) NULL);
 730   assert(image->signature == MagickCoreSignature);
 731   if (image->debug != MagickFalse)
 732     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 733   assert(exception != (ExceptionInfo *) NULL);
 734   assert(exception->signature == MagickCoreSignature);
 735   separate_image=CloneImage(image,0,0,MagickTrue,exception);
 736   if (separate_image == (Image *) NULL)
 737     return((Image *) NULL);
 738   if (SetImageStorageClass(separate_image,DirectClass,exception) == MagickFalse)
 739     {
 740       separate_image=DestroyImage(separate_image);
 741       return((Image *) NULL);
 742     }
 743   separate_image->alpha_trait=UndefinedPixelTrait;
 744   (void) SetImageColorspace(separate_image,GRAYColorspace,exception);
 745   separate_image->gamma=image->gamma;
 746   /*
 747     Separate image.
 748   */
 749   status=MagickTrue;
 750   progress=0;
 751   image_view=AcquireVirtualCacheView(image,exception);
 752   separate_view=AcquireAuthenticCacheView(separate_image,exception);
 753 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 754   #pragma omp parallel for schedule(static) shared(progress,status) \
 755     magick_number_threads(image,image,image->rows,1)
 756 #endif
 757   for (y=0; y < (ssize_t) image->rows; y++)
 758   {
 759     register const Quantum
 760       *magick_restrict p;
 761
 762     register Quantum
 763       *magick_restrict q;
 764
 765     register ssize_t
 766       x;
 767
 768     if (status == MagickFalse)
 769       continue;
 770     p=GetCacheViewVirtualPixels(image_view,0,y,image->columns,1,exception);
 771     q=QueueCacheViewAuthenticPixels(separate_view,0,y,separate_image->columns,1,
 772       exception);
 773     if ((p == (const Quantum *) NULL) || (q == (Quantum *) NULL))
 774       {
 775         status=MagickFalse;
 776         continue;
 777       }
 778     for (x=0; x < (ssize_t) image->columns; x++)
 779     {
 780       register ssize_t
 781         i;
 782
 783       SetPixelChannel(separate_image,GrayPixelChannel,(Quantum) 0,q);
 784       for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
 785       {
 786         PixelChannel channel = GetPixelChannelChannel(image,i);
 787         PixelTrait traits = GetPixelChannelTraits(image,channel);
 788         if ((traits == UndefinedPixelTrait) ||
 789             (GetChannelBit(channel_type,channel) == 0))
 790           continue;
 791         SetPixelChannel(separate_image,GrayPixelChannel,p[i],q);
 792       }
 793       p+=GetPixelChannels(image);
 794       q+=GetPixelChannels(separate_image);
 795     }
 796     if (SyncCacheViewAuthenticPixels(separate_view,exception) == MagickFalse)
 797       status=MagickFalse;
 798     if (image->progress_monitor != (MagickProgressMonitor) NULL)
 799       {
 800         MagickBooleanType
 801           proceed;
 802
 803 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 804         #pragma omp critical (MagickCore_SeparateImage)
 805 #endif
 806         proceed=SetImageProgress(image,SeparateImageTag,progress++,image->rows);
 807         if (proceed == MagickFalse)
 808           status=MagickFalse;
 809       }
 810   }
 811   separate_view=DestroyCacheView(separate_view);
 812   image_view=DestroyCacheView(image_view);
 813   (void) SetImageChannelMask(separate_image,DefaultChannels);
 814   if (status == MagickFalse)
 815     separate_image=DestroyImage(separate_image);
 816   return(separate_image);
 817 }
 818 \f
 819 /*
 820 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 821 %                                                                             %
 822 %                                                                             %
 823 %                                                                             %
 824 %     S e p a r a t e I m a g e s                                             %
 825 %                                                                             %
 826 %                                                                             %
 827 %                                                                             %
 828 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 829 %
 830 %  SeparateImages() returns a separate grayscale image for each channel
 831 %  specified.
 832 %
 833 %  The format of the SeparateImages method is:
 834 %
 835 %      Image *SeparateImages(const Image *image,ExceptionInfo *exception)
 836 %
 837 %  A description of each parameter follows:
 838 %
 839 %    o image: the image.
 840 %
 841 %    o exception: return any errors or warnings in this structure.
 842 %
 843 */
 844 MagickExport Image *SeparateImages(const Image *image,ExceptionInfo *exception)
 845 {
 846   Image
 847     *images,
 848     *separate_image;
 849
 850   register ssize_t
 851     i;
 852
 853   assert(image != (Image *) NULL);
 854   assert(image->signature == MagickCoreSignature);
 855   if (image->debug != MagickFalse)
 856     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 857   images=NewImageList();
 858   for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
 859   {
 860     PixelChannel channel = GetPixelChannelChannel(image,i);
 861     PixelTrait traits = GetPixelChannelTraits(image,channel);
 862     if ((traits == UndefinedPixelTrait) || ((traits & UpdatePixelTrait) == 0))
 863       continue;
 864     separate_image=SeparateImage(image,(ChannelType) (1UL << channel),
 865       exception);
 866     if (separate_image != (Image *) NULL)
 867       AppendImageToList(&images,separate_image);
 868   }
 869   if (images == (Image *) NULL)
 870     images=SeparateImage(image,UndefinedChannel,exception);
 871   return(images);
 872 }
 873 \f
 874 /*
 875 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 876 %                                                                             %
 877 %                                                                             %
 878 %                                                                             %
 879 %   S e t I m a g e A l p h a C h a n n e l                                   %
 880 %                                                                             %
 881 %                                                                             %
 882 %                                                                             %
 883 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 884 %
 885 %  SetImageAlphaChannel() activates, deactivates, resets, or sets the alpha
 886 %  channel.
 887 %
 888 %  The format of the SetImageAlphaChannel method is:
 889 %
 890 %      MagickBooleanType SetImageAlphaChannel(Image *image,
 891 %        const AlphaChannelOption alpha_type,ExceptionInfo *exception)
 892 %
 893 %  A description of each parameter follows:
 894 %
 895 %    o image: the image.
 896 %
 897 %    o alpha_type:  The alpha channel type: ActivateAlphaChannel,
 898 %      AssociateAlphaChannel, CopyAlphaChannel, DeactivateAlphaChannel,
 899 %      DisassociateAlphaChannel,  ExtractAlphaChannel, OffAlphaChannel,
 900 %      OnAlphaChannel, OpaqueAlphaChannel, SetAlphaChannel, ShapeAlphaChannel,
 901 %      and TransparentAlphaChannel.
 902 %
 903 %    o exception: return any errors or warnings in this structure.
 904 %
 905 */
 906
 907 static inline void FlattenPixelInfo(const Image *image,const PixelInfo *p,
 908   const double alpha,const Quantum *q,const double beta,
 909   Quantum *composite)
 910 {
 911   double
 912     Da,
 913     gamma,
 914     Sa;
 915
 916   register ssize_t
 917     i;
 918
 919   /*
 920     Compose pixel p over pixel q with the given alpha.
 921   */
 922   Sa=QuantumScale*alpha;
 923   Da=QuantumScale*beta,
 924   gamma=Sa*(-Da)+Sa+Da;
 925   gamma=PerceptibleReciprocal(gamma);
 926   for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
 927   {
 928     PixelChannel channel = GetPixelChannelChannel(image,i);
 929     PixelTrait traits = GetPixelChannelTraits(image,channel);
 930     if (traits == UndefinedPixelTrait)
 931       continue;
 932     switch (channel)
 933     {
 934       case RedPixelChannel:
 935       {
 936         composite[i]=ClampToQuantum(gamma*MagickOver_((double) q[i],beta,
 937           (double) p->red,alpha));
 938         break;
 939       }
 940       case GreenPixelChannel:
 941       {
 942         composite[i]=ClampToQuantum(gamma*MagickOver_((double) q[i],beta,
 943           (double) p->green,alpha));
 944         break;
 945       }
 946       case BluePixelChannel:
 947       {
 948         composite[i]=ClampToQuantum(gamma*MagickOver_((double) q[i],beta,
 949           (double) p->blue,alpha));
 950         break;
 951       }
 952       case BlackPixelChannel:
 953       {
 954         composite[i]=ClampToQuantum(gamma*MagickOver_((double) q[i],beta,
 955           (double) p->black,alpha));
 956         break;
 957       }
 958       case AlphaPixelChannel:
 959       {
 960         composite[i]=ClampToQuantum(QuantumRange*(Sa*(-Da)+Sa+Da));
 961         break;
 962       }
 963       default:
 964         break;
 965     }
 966   }
 967 }
 968
 969 MagickExport MagickBooleanType SetImageAlphaChannel(Image *image,
 970   const AlphaChannelOption alpha_type,ExceptionInfo *exception)
 971 {
 972   CacheView
 973     *image_view;
 974
 975   MagickBooleanType
 976     status;
 977
 978   ssize_t
 979     y;
 980
 981   assert(image != (Image *) NULL);
 982   if (image->debug != MagickFalse)
 983     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 984   assert(image->signature == MagickCoreSignature);
 985   status=MagickTrue;
 986   switch (alpha_type)
 987   {
 988     case ActivateAlphaChannel:
 989     {
 990       image->alpha_trait=BlendPixelTrait;
 991       break;
 992     }
 993     case AssociateAlphaChannel:
 994     {
 995       /*
 996         Associate alpha.
 997       */
 998       status=SetImageStorageClass(image,DirectClass,exception);
 999       if (status == MagickFalse)
1000         break;
1001       image_view=AcquireAuthenticCacheView(image,exception);
1002 #if defined(MAGICKCORE_OPENMP_SUPPORT)
1003       #pragma omp parallel for schedule(static) shared(status) \
1004         magick_number_threads(image,image,image->rows,1)
1005 #endif
1006       for (y=0; y < (ssize_t) image->rows; y++)
1007       {
1008         register Quantum
1009           *magick_restrict q;
1010
1011         register ssize_t
1012           x;
1013
1014         if (status == MagickFalse)
1015           continue;
1016         q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
1017           exception);
1018         if (q == (Quantum *) NULL)
1019           {
1020             status=MagickFalse;
1021             continue;
1022           }
1023         for (x=0; x < (ssize_t) image->columns; x++)
1024         {
1025           double
1026             gamma;
1027
1028           register ssize_t
1029             i;
1030
1031           gamma=QuantumScale*GetPixelAlpha(image,q);
1032           for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
1033           {
1034             PixelChannel channel = GetPixelChannelChannel(image,i);
1035             PixelTrait traits = GetPixelChannelTraits(image,channel);
1036             if (channel == AlphaPixelChannel)
1037               continue;
1038             if ((traits & UpdatePixelTrait) == 0)
1039               continue;
1040             q[i]=ClampToQuantum(gamma*q[i]);
1041           }
1042           q+=GetPixelChannels(image);
1043         }
1044         if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
1045           status=MagickFalse;
1046       }
1047       image_view=DestroyCacheView(image_view);
1048       image->alpha_trait=CopyPixelTrait;
1049       return(status);
1050     }
1051     case BackgroundAlphaChannel:
1052     {
1053       /*
1054         Set transparent pixels to background color.
1055       */
1056       if (image->alpha_trait == UndefinedPixelTrait)
1057         break;
1058       status=SetImageStorageClass(image,DirectClass,exception);
1059       if (status == MagickFalse)
1060         break;
1061       image_view=AcquireAuthenticCacheView(image,exception);
1062 #if defined(MAGICKCORE_OPENMP_SUPPORT)
1063       #pragma omp parallel for schedule(static) shared(status) \
1064         magick_number_threads(image,image,image->rows,1)
1065 #endif
1066       for (y=0; y < (ssize_t) image->rows; y++)
1067       {
1068         register Quantum
1069           *magick_restrict q;
1070
1071         register ssize_t
1072           x;
1073
1074         if (status == MagickFalse)
1075           continue;
1076         q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
1077           exception);
1078         if (q == (Quantum *) NULL)
1079           {
1080             status=MagickFalse;
1081             continue;
1082           }
1083         for (x=0; x < (ssize_t) image->columns; x++)
1084         {
1085           if (GetPixelAlpha(image,q) == TransparentAlpha)
1086             {
1087               SetPixelViaPixelInfo(image,&image->background_color,q);
1088               SetPixelChannel(image,AlphaPixelChannel,TransparentAlpha,q);
1089             }
1090           q+=GetPixelChannels(image);
1091         }
1092         if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
1093           status=MagickFalse;
1094       }
1095       image_view=DestroyCacheView(image_view);
1096       return(status);
1097     }
1098     case CopyAlphaChannel:
1099     {
1100       image->alpha_trait=UpdatePixelTrait;
1101       status=CompositeImage(image,image,IntensityCompositeOp,MagickTrue,0,0,
1102         exception);
1103       break;
1104     }
1105     case DeactivateAlphaChannel:
1106     {
1107       if (image->alpha_trait == UndefinedPixelTrait)
1108         status=SetImageAlpha(image,OpaqueAlpha,exception);
1109       image->alpha_trait=CopyPixelTrait;
1110       break;
1111     }
1112     case DisassociateAlphaChannel:
1113     {
1114       /*
1115         Disassociate alpha.
1116       */
1117       status=SetImageStorageClass(image,DirectClass,exception);
1118       if (status == MagickFalse)
1119         break;
1120       image->alpha_trait=BlendPixelTrait;
1121       image_view=AcquireAuthenticCacheView(image,exception);
1122 #if defined(MAGICKCORE_OPENMP_SUPPORT)
1123       #pragma omp parallel for schedule(static) shared(status) \
1124         magick_number_threads(image,image,image->rows,1)
1125 #endif
1126       for (y=0; y < (ssize_t) image->rows; y++)
1127       {
1128         register Quantum
1129           *magick_restrict q;
1130
1131         register ssize_t
1132           x;
1133
1134         if (status == MagickFalse)
1135           continue;
1136         q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
1137           exception);
1138         if (q == (Quantum *) NULL)
1139           {
1140             status=MagickFalse;
1141             continue;
1142           }
1143         for (x=0; x < (ssize_t) image->columns; x++)
1144         {
1145           double
1146             gamma,
1147             Sa;
1148
1149           register ssize_t
1150             i;
1151
1152           Sa=QuantumScale*GetPixelAlpha(image,q);
1153           gamma=PerceptibleReciprocal(Sa);
1154           for (i=0; i < (ssize_t) GetPixelChannels(image); i++)
1155           {
1156             PixelChannel channel = GetPixelChannelChannel(image,i);
1157             PixelTrait traits = GetPixelChannelTraits(image,channel);
1158             if (channel == AlphaPixelChannel)
1159               continue;
1160             if ((traits & UpdatePixelTrait) == 0)
1161               continue;
1162             q[i]=ClampToQuantum(gamma*q[i]);
1163           }
1164           q+=GetPixelChannels(image);
1165         }
1166         if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
1167           status=MagickFalse;
1168       }
1169       image_view=DestroyCacheView(image_view);
1170       image->alpha_trait=UndefinedPixelTrait;
1171       return(status);
1172     }
1173     case DiscreteAlphaChannel:
1174     {
1175       if (image->alpha_trait == UndefinedPixelTrait)
1176         status=SetImageAlpha(image,OpaqueAlpha,exception);
1177       image->alpha_trait=UpdatePixelTrait;
1178       break;
1179     }
1180     case ExtractAlphaChannel:
1181     {
1182       status=CompositeImage(image,image,AlphaCompositeOp,MagickTrue,0,0,
1183         exception);
1184       image->alpha_trait=UndefinedPixelTrait;
1185       break;
1186     }
1187     case OffAlphaChannel:
1188     {
1189       image->alpha_trait=UndefinedPixelTrait;
1190       break;
1191     }
1192     case OnAlphaChannel:
1193     {
1194       if (image->alpha_trait == UndefinedPixelTrait)
1195         status=SetImageAlpha(image,OpaqueAlpha,exception);
1196       image->alpha_trait=BlendPixelTrait;
1197       break;
1198     }
1199     case OpaqueAlphaChannel:
1200     {
1201       status=SetImageAlpha(image,OpaqueAlpha,exception);
1202       break;
1203     }
1204     case RemoveAlphaChannel:
1205     {
1206       /*
1207         Remove transparency.
1208       */
1209       if (image->alpha_trait == UndefinedPixelTrait)
1210         break;
1211       status=SetImageStorageClass(image,DirectClass,exception);
1212       if (status == MagickFalse)
1213         break;
1214       image_view=AcquireAuthenticCacheView(image,exception);
1215 #if defined(MAGICKCORE_OPENMP_SUPPORT)
1216       #pragma omp parallel for schedule(static) shared(status) \
1217         magick_number_threads(image,image,image->rows,1)
1218 #endif
1219       for (y=0; y < (ssize_t) image->rows; y++)
1220       {
1221         register Quantum
1222           *magick_restrict q;
1223
1224         register ssize_t
1225           x;
1226
1227         if (status == MagickFalse)
1228           continue;
1229         q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,
1230           exception);
1231         if (q == (Quantum *) NULL)
1232           {
1233             status=MagickFalse;
1234             continue;
1235           }
1236         for (x=0; x < (ssize_t) image->columns; x++)
1237         {
1238           FlattenPixelInfo(image,&image->background_color,
1239             image->background_color.alpha,q,(double) GetPixelAlpha(image,q),q);
1240           q+=GetPixelChannels(image);
1241         }
1242         if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
1243           status=MagickFalse;
1244       }
1245       image_view=DestroyCacheView(image_view);
1246       image->alpha_trait=image->background_color.alpha_trait;
1247       break;
1248     }
1249     case SetAlphaChannel:
1250     {
1251       if (image->alpha_trait == UndefinedPixelTrait)
1252         status=SetImageAlpha(image,OpaqueAlpha,exception);
1253       break;
1254     }
1255     case ShapeAlphaChannel:
1256     {
1257       /*
1258         Set alpha channel by shape.
1259       */
1260       status=SetImageStorageClass(image,DirectClass,exception);
1261       if (status == MagickFalse)
1262         break;
1263       image->alpha_trait=UpdatePixelTrait;
1264       (void) SetImageMask(image,WritePixelMask,image,exception);
1265       (void) LevelImageColors(image,&image->background_color,
1266         &image->background_color,MagickTrue,exception);
1267       (void) SetImageMask(image,WritePixelMask,(Image *) NULL,exception);
1268       break;
1269     }
1270     case TransparentAlphaChannel:
1271     {
1272       status=SetImageAlpha(image,TransparentAlpha,exception);
1273       break;
1274     }
1275     case UndefinedAlphaChannel:
1276       break;
1277   }
1278   if (status == MagickFalse)
1279     return(status);
1280   (void) SetPixelChannelMask(image,image->channel_mask);
1281   return(SyncImagePixelCache(image,exception));
1282 }