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 1999-2012 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     double
 140       pixel;
 141
 142     pixel=(double) (i*(QuantumRange/MagickMax(colors-1,1)));
 143     image->colormap[i].red=pixel;
 144     image->colormap[i].green=pixel;
 145     image->colormap[i].blue=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 %  WARNING: this assumes an images colormap is in a well know and defined
 167 %  order. Currently Imagemagick has no way of setting that order.
 168 %
 169 %  The format of the CycleColormapImage method is:
 170 %
 171 %      MagickBooleanType CycleColormapImage(Image *image,const ssize_t displace,
 172 %        ExceptionInfo *exception)
 173 %
 174 %  A description of each parameter follows:
 175 %
 176 %    o image: the image.
 177 %
 178 %    o displace:  displace the colormap this amount.
 179 %
 180 %    o exception: return any errors or warnings in this structure.
 181 %
 182 */
 183 MagickExport MagickBooleanType CycleColormapImage(Image *image,
 184   const ssize_t displace,ExceptionInfo *exception)
 185 {
 186   CacheView
 187     *image_view;
 188
 189   MagickBooleanType
 190     status;
 191
 192   ssize_t
 193     y;
 194
 195   assert(image != (Image *) NULL);
 196   assert(image->signature == MagickSignature);
 197   if (image->debug != MagickFalse)
 198     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 199   if (image->storage_class == DirectClass)
 200     (void) SetImageType(image,PaletteType,exception);
 201   status=MagickTrue;
 202   image_view=AcquireCacheView(image);
 203 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 204   #pragma omp parallel for schedule(static,4) shared(status)
 205 #endif
 206   for (y=0; y < (ssize_t) image->rows; y++)
 207   {
 208     register ssize_t
 209       x;
 210
 211     register Quantum
 212       *restrict q;
 213
 214     ssize_t
 215       index;
 216
 217     if (status == MagickFalse)
 218       continue;
 219     q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
 220     if (q == (Quantum *) NULL)
 221       {
 222         status=MagickFalse;
 223         continue;
 224       }
 225     for (x=0; x < (ssize_t) image->columns; x++)
 226     {
 227       index=(ssize_t) (GetPixelIndex(image,q)+displace) % image->colors;
 228       if (index < 0)
 229         index+=(ssize_t) image->colors;
 230       SetPixelIndex(image,(Quantum) index,q);
 231       SetPixelInfoPixel(image,image->colormap+(ssize_t) index,q);
 232       q+=GetPixelChannels(image);
 233     }
 234     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
 235       status=MagickFalse;
 236   }
 237   image_view=DestroyCacheView(image_view);
 238   return(status);
 239 }
 240 \f
 241 /*
 242 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 243 %                                                                             %
 244 %                                                                             %
 245 %                                                                             %
 246 +   S o r t C o l o r m a p B y I n t e n s i t y                             %
 247 %                                                                             %
 248 %                                                                             %
 249 %                                                                             %
 250 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 251 %
 252 %  SortColormapByIntensity() sorts the colormap of a PseudoClass image by
 253 %  decreasing color intensity.
 254 %
 255 %  The format of the SortColormapByIntensity method is:
 256 %
 257 %      MagickBooleanType SortColormapByIntensity(Image *image,
 258 %        ExceptionInfo *exception)
 259 %
 260 %  A description of each parameter follows:
 261 %
 262 %    o image: A pointer to an Image structure.
 263 %
 264 %    o exception: return any errors or warnings in this structure.
 265 %
 266 */
 267
 268 #if defined(__cplusplus) || defined(c_plusplus)
 269 extern "C" {
 270 #endif
 271
 272 static int IntensityCompare(const void *x,const void *y)
 273 {
 274   const PixelInfo
 275     *color_1,
 276     *color_2;
 277
 278   int
 279     intensity;
 280
 281   color_1=(const PixelInfo *) x;
 282   color_2=(const PixelInfo *) y;
 283   intensity=(int) GetPixelInfoIntensity(color_2)-(int)
 284     GetPixelInfoIntensity(color_1);
 285   return(intensity);
 286 }
 287
 288 #if defined(__cplusplus) || defined(c_plusplus)
 289 }
 290 #endif
 291
 292 MagickExport MagickBooleanType SortColormapByIntensity(Image *image,
 293   ExceptionInfo *exception)
 294 {
 295   CacheView
 296     *image_view;
 297
 298   MagickBooleanType
 299     status;
 300
 301   register ssize_t
 302     i;
 303
 304   ssize_t
 305     y;
 306
 307   unsigned short
 308     *pixels;
 309
 310   assert(image != (Image *) NULL);
 311   if (image->debug != MagickFalse)
 312     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 313   assert(image->signature == MagickSignature);
 314   if (image->storage_class != PseudoClass)
 315     return(MagickTrue);
 316   /*
 317     Allocate memory for pixel indexes.
 318   */
 319   pixels=(unsigned short *) AcquireQuantumMemory((size_t) image->colors,
 320     sizeof(*pixels));
 321   if (pixels == (unsigned short *) NULL)
 322     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 323       image->filename);
 324   /*
 325     Assign index values to colormap entries.
 326   */
 327 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 328   #pragma omp parallel for schedule(static,4) shared(status)
 329 #endif
 330   for (i=0; i < (ssize_t) image->colors; i++)
 331     image->colormap[i].alpha=(double) i;
 332   /*
 333     Sort image colormap by decreasing color popularity.
 334   */
 335   qsort((void *) image->colormap,(size_t) image->colors,
 336     sizeof(*image->colormap),IntensityCompare);
 337   /*
 338     Update image colormap indexes to sorted colormap order.
 339   */
 340 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 341   #pragma omp parallel for schedule(static,4) shared(status)
 342 #endif
 343   for (i=0; i < (ssize_t) image->colors; i++)
 344     pixels[(ssize_t) image->colormap[i].alpha]=(unsigned short) i;
 345   status=MagickTrue;
 346   image_view=AcquireCacheView(image);
 347   for (y=0; y < (ssize_t) image->rows; y++)
 348   {
 349     Quantum
 350       index;
 351
 352     register ssize_t
 353       x;
 354
 355     register Quantum
 356       *restrict q;
 357
 358     q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
 359     if (q == (Quantum *) NULL)
 360       {
 361         status=MagickFalse;
 362         break;
 363       }
 364     for (x=0; x < (ssize_t) image->columns; x++)
 365     {
 366       index=(Quantum) pixels[(ssize_t) GetPixelIndex(image,q)];
 367       SetPixelIndex(image,index,q);
 368       SetPixelInfoPixel(image,image->colormap+(ssize_t) index,q);
 369       q+=GetPixelChannels(image);
 370     }
 371     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
 372       status=MagickFalse;
 373     if (status == MagickFalse)
 374       break;
 375   }
 376   image_view=DestroyCacheView(image_view);
 377   pixels=(unsigned short *) RelinquishMagickMemory(pixels);
 378   return(status);
 379 }