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

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %            CCCC   OOO   L       OOO   RRRR   M   M   AAA   PPPP             %
   7 %           C      O   O  L      O   O  R   R  MM MM  A   A  P   P            %
   8 %           C      O   O  L      O   O  RRRR   M M M  AAAAA  PPPP             %
   9 %           C      O   O  L      O   O  R R    M   M  A   A  P                %
  10 %            CCCC   OOO   LLLLL   OOO   R  R   M   M  A   A  P                %
  11 %                                                                             %
  12 %                                                                             %
  13 %                        MagickCore Colormap Methods                          %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 July 1992                                   %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2011 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 %  We use linked-lists because splay-trees do not currently support duplicate
  37 %  key / value pairs (.e.g X11 green compliance and SVG green compliance).
  38 %
  39 */
  40 \f
  41 /*
  42   Include declarations.
  43 */
  44 #include "MagickCore/studio.h"
  45 #include "MagickCore/blob.h"
  46 #include "MagickCore/cache-view.h"
  47 #include "MagickCore/cache.h"
  48 #include "MagickCore/color.h"
  49 #include "MagickCore/color-private.h"
  50 #include "MagickCore/colormap.h"
  51 #include "MagickCore/client.h"
  52 #include "MagickCore/configure.h"
  53 #include "MagickCore/exception.h"
  54 #include "MagickCore/exception-private.h"
  55 #include "MagickCore/gem.h"
  56 #include "MagickCore/geometry.h"
  57 #include "MagickCore/image-private.h"
  58 #include "MagickCore/memory_.h"
  59 #include "MagickCore/monitor.h"
  60 #include "MagickCore/monitor-private.h"
  61 #include "MagickCore/option.h"
  62 #include "MagickCore/pixel-accessor.h"
  63 #include "MagickCore/quantize.h"
  64 #include "MagickCore/quantum.h"
  65 #include "MagickCore/semaphore.h"
  66 #include "MagickCore/string_.h"
  67 #include "MagickCore/token.h"
  68 #include "MagickCore/utility.h"
  69 #include "MagickCore/xml-tree.h"
  70 \f
  71 /*
  72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  73 %                                                                             %
  74 %                                                                             %
  75 %                                                                             %
  76 %   A c q u i r e I m a g e C o l o r m a p                                   %
  77 %                                                                             %
  78 %                                                                             %
  79 %                                                                             %
  80 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  81 %
  82 %  AcquireImageColormap() allocates an image colormap and initializes
  83 %  it to a linear gray colorspace.  If the image already has a colormap,
  84 %  it is replaced.  AcquireImageColormap() returns MagickTrue if successful,
  85 %  otherwise MagickFalse if there is not enough memory.
  86 %
  87 %  The format of the AcquireImageColormap method is:
  88 %
  89 %      MagickBooleanType AcquireImageColormap(Image *image,
  90 %        const size_t colors,ExceptionInfo *exception)
  91 %
  92 %  A description of each parameter follows:
  93 %
  94 %    o image: the image.
  95 %
  96 %    o colors: the number of colors in the image colormap.
  97 %
  98 %    o exception: return any errors or warnings in this structure.
  99 %
 100 */
 101
 102 static inline size_t MagickMax(const size_t x,
 103   const size_t y)
 104 {
 105   if (x > y)
 106     return(x);
 107   return(y);
 108 }
 109
 110 MagickExport MagickBooleanType AcquireImageColormap(Image *image,
 111   const size_t colors,ExceptionInfo *exception)
 112 {
 113   register ssize_t
 114     i;
 115
 116   size_t
 117     length;
 118
 119   /*
 120     Allocate image colormap.
 121   */
 122   assert(image != (Image *) NULL);
 123   assert(image->signature == MagickSignature);
 124   if (image->debug != MagickFalse)
 125     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 126   image->colors=colors;
 127   length=(size_t) colors;
 128   if (image->colormap == (PixelInfo *) NULL)
 129     image->colormap=(PixelInfo *) AcquireQuantumMemory(length,
 130       sizeof(*image->colormap));
 131   else
 132     image->colormap=(PixelInfo *) ResizeQuantumMemory(image->colormap,length,
 133       sizeof(*image->colormap));
 134   if (image->colormap == (PixelInfo *) NULL)
 135     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 136       image->filename);
 137   for (i=0; i < (ssize_t) image->colors; i++)
 138   {
 139     size_t
 140       pixel;
 141
 142     pixel=(size_t) (i*(QuantumRange/MagickMax(colors-1,1)));
 143     image->colormap[i].red=(Quantum) pixel;
 144     image->colormap[i].green=(Quantum) pixel;
 145     image->colormap[i].blue=(Quantum) pixel;
 146     image->colormap[i].alpha=OpaqueAlpha;
 147   }
 148   return(SetImageStorageClass(image,PseudoClass,exception));
 149 }
 150 \f
 151 /*
 152 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 153 %                                                                             %
 154 %                                                                             %
 155 %                                                                             %
 156 %     C y c l e C o l o r m a p I m a g e                                     %
 157 %                                                                             %
 158 %                                                                             %
 159 %                                                                             %
 160 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 161 %
 162 %  CycleColormap() displaces an image's colormap by a given number of
 163 %  positions.  If you cycle the colormap a number of times you can produce
 164 %  a psychodelic effect.
 165 %
 166 %  The format of the CycleColormapImage method is:
 167 %
 168 %      MagickBooleanType CycleColormapImage(Image *image,const ssize_t displace,
 169 %        ExceptionInfo *exception)
 170 %
 171 %  A description of each parameter follows:
 172 %
 173 %    o image: the image.
 174 %
 175 %    o displace:  displace the colormap this amount.
 176 %
 177 %    o exception: return any errors or warnings in this structure.
 178 %
 179 */
 180 MagickExport MagickBooleanType CycleColormapImage(Image *image,
 181   const ssize_t displace,ExceptionInfo *exception)
 182 {
 183   CacheView
 184     *image_view;
 185
 186   MagickBooleanType
 187     status;
 188
 189   ssize_t
 190     y;
 191
 192   assert(image != (Image *) NULL);
 193   assert(image->signature == MagickSignature);
 194   if (image->debug != MagickFalse)
 195     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 196   if (image->storage_class == DirectClass)
 197     (void) SetImageType(image,PaletteType,exception);
 198   status=MagickTrue;
 199   image_view=AcquireCacheView(image);
 200 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 201   #pragma omp parallel for schedule(dynamic,4) shared(status)
 202 #endif
 203   for (y=0; y < (ssize_t) image->rows; y++)
 204   {
 205     register ssize_t
 206       x;
 207
 208     register Quantum
 209       *restrict q;
 210
 211     ssize_t
 212       index;
 213
 214     if (status == MagickFalse)
 215       continue;
 216     q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
 217     if (q == (Quantum *) NULL)
 218       {
 219         status=MagickFalse;
 220         continue;
 221       }
 222     for (x=0; x < (ssize_t) image->columns; x++)
 223     {
 224       index=(ssize_t) (GetPixelIndex(image,q)+displace) % image->colors;
 225       if (index < 0)
 226         index+=(ssize_t) image->colors;
 227       SetPixelIndex(image,(Quantum) index,q);
 228       SetPixelPixelInfo(image,image->colormap+(ssize_t) index,q);
 229       q+=GetPixelChannels(image);
 230     }
 231     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
 232       status=MagickFalse;
 233   }
 234   image_view=DestroyCacheView(image_view);
 235   return(status);
 236 }
 237 \f
 238 /*
 239 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 240 %                                                                             %
 241 %                                                                             %
 242 %                                                                             %
 243 +   S o r t C o l o r m a p B y I n t e n s i t y                             %
 244 %                                                                             %
 245 %                                                                             %
 246 %                                                                             %
 247 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 248 %
 249 %  SortColormapByIntensity() sorts the colormap of a PseudoClass image by
 250 %  decreasing color intensity.
 251 %
 252 %  The format of the SortColormapByIntensity method is:
 253 %
 254 %      MagickBooleanType SortColormapByIntensity(Image *image,
 255 %        ExceptionInfo *exception)
 256 %
 257 %  A description of each parameter follows:
 258 %
 259 %    o image: A pointer to an Image structure.
 260 %
 261 %    o exception: return any errors or warnings in this structure.
 262 %
 263 */
 264
 265 #if defined(__cplusplus) || defined(c_plusplus)
 266 extern "C" {
 267 #endif
 268
 269 static int IntensityCompare(const void *x,const void *y)
 270 {
 271   const PixelInfo
 272     *color_1,
 273     *color_2;
 274
 275   int
 276     intensity;
 277
 278   color_1=(const PixelInfo *) x;
 279   color_2=(const PixelInfo *) y;
 280   intensity=(int) GetPixelInfoIntensity(color_2)-(int)
 281     GetPixelInfoIntensity(color_1);
 282   return(intensity);
 283 }
 284
 285 #if defined(__cplusplus) || defined(c_plusplus)
 286 }
 287 #endif
 288
 289 MagickExport MagickBooleanType SortColormapByIntensity(Image *image,
 290   ExceptionInfo *exception)
 291 {
 292   CacheView
 293     *image_view;
 294
 295   MagickBooleanType
 296     status;
 297
 298   register ssize_t
 299     i;
 300
 301   ssize_t
 302     y;
 303
 304   unsigned short
 305     *pixels;
 306
 307   assert(image != (Image *) NULL);
 308   if (image->debug != MagickFalse)
 309     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 310   assert(image->signature == MagickSignature);
 311   if (image->storage_class != PseudoClass)
 312     return(MagickTrue);
 313   /*
 314     Allocate memory for pixel indexes.
 315   */
 316   pixels=(unsigned short *) AcquireQuantumMemory((size_t) image->colors,
 317     sizeof(*pixels));
 318   if (pixels == (unsigned short *) NULL)
 319     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 320       image->filename);
 321   /*
 322     Assign index values to colormap entries.
 323   */
 324 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 325   #pragma omp parallel for schedule(dynamic,4) shared(status)
 326 #endif
 327   for (i=0; i < (ssize_t) image->colors; i++)
 328     image->colormap[i].alpha=(Quantum) i;
 329   /*
 330     Sort image colormap by decreasing color popularity.
 331   */
 332   qsort((void *) image->colormap,(size_t) image->colors,
 333     sizeof(*image->colormap),IntensityCompare);
 334   /*
 335     Update image colormap indexes to sorted colormap order.
 336   */
 337 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 338   #pragma omp parallel for schedule(dynamic,4) shared(status)
 339 #endif
 340   for (i=0; i < (ssize_t) image->colors; i++)
 341     pixels[(ssize_t) image->colormap[i].alpha]=(unsigned short) i;
 342   status=MagickTrue;
 343   image_view=AcquireCacheView(image);
 344   for (y=0; y < (ssize_t) image->rows; y++)
 345   {
 346     Quantum
 347       index;
 348
 349     register ssize_t
 350       x;
 351
 352     register Quantum
 353       *restrict q;
 354
 355     q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
 356     if (q == (Quantum *) NULL)
 357       {
 358         status=MagickFalse;
 359         continue;
 360       }
 361     for (x=0; x < (ssize_t) image->columns; x++)
 362     {
 363       index=(Quantum) pixels[(ssize_t) GetPixelIndex(image,q)];
 364       SetPixelIndex(image,index,q);
 365       SetPixelPixelInfo(image,image->colormap+(ssize_t) index,q);
 366       q+=GetPixelChannels(image);
 367     }
 368     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
 369       status=MagickFalse;
 370     if (status == MagickFalse)
 371       break;
 372   }
 373   image_view=DestroyCacheView(image_view);
 374   pixels=(unsigned short *) RelinquishMagickMemory(pixels);
 375   return(status);
 376 }