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/attribute.h"
  46 #include "MagickCore/blob.h"
  47 #include "MagickCore/cache-view.h"
  48 #include "MagickCore/cache.h"
  49 #include "MagickCore/color.h"
  50 #include "MagickCore/color-private.h"
  51 #include "MagickCore/colormap.h"
  52 #include "MagickCore/client.h"
  53 #include "MagickCore/configure.h"
  54 #include "MagickCore/exception.h"
  55 #include "MagickCore/exception-private.h"
  56 #include "MagickCore/gem.h"
  57 #include "MagickCore/geometry.h"
  58 #include "MagickCore/image-private.h"
  59 #include "MagickCore/memory_.h"
  60 #include "MagickCore/monitor.h"
  61 #include "MagickCore/monitor-private.h"
  62 #include "MagickCore/option.h"
  63 #include "MagickCore/pixel-accessor.h"
  64 #include "MagickCore/quantize.h"
  65 #include "MagickCore/quantum.h"
  66 #include "MagickCore/resource_.h"
  67 #include "MagickCore/semaphore.h"
  68 #include "MagickCore/string_.h"
  69 #include "MagickCore/thread-private.h"
  70 #include "MagickCore/token.h"
  71 #include "MagickCore/utility.h"
  72 #include "MagickCore/xml-tree.h"
  73 \f
  74 /*
  75 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  76 %                                                                             %
  77 %                                                                             %
  78 %                                                                             %
  79 %   A c q u i r e I m a g e C o l o r m a p                                   %
  80 %                                                                             %
  81 %                                                                             %
  82 %                                                                             %
  83 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  84 %
  85 %  AcquireImageColormap() allocates an image colormap and initializes
  86 %  it to a linear gray colorspace.  If the image already has a colormap,
  87 %  it is replaced.  AcquireImageColormap() returns MagickTrue if successful,
  88 %  otherwise MagickFalse if there is not enough memory.
  89 %
  90 %  The format of the AcquireImageColormap method is:
  91 %
  92 %      MagickBooleanType AcquireImageColormap(Image *image,
  93 %        const size_t colors,ExceptionInfo *exception)
  94 %
  95 %  A description of each parameter follows:
  96 %
  97 %    o image: the image.
  98 %
  99 %    o colors: the number of colors in the image colormap.
 100 %
 101 %    o exception: return any errors or warnings in this structure.
 102 %
 103 */
 104
 105 static inline size_t MagickMax(const size_t x,
 106   const size_t y)
 107 {
 108   if (x > y)
 109     return(x);
 110   return(y);
 111 }
 112
 113 MagickExport MagickBooleanType AcquireImageColormap(Image *image,
 114   const size_t colors,ExceptionInfo *exception)
 115 {
 116   register ssize_t
 117     i;
 118
 119   size_t
 120     length;
 121
 122   /*
 123     Allocate image colormap.
 124   */
 125   assert(image != (Image *) NULL);
 126   assert(image->signature == MagickSignature);
 127   if (image->debug != MagickFalse)
 128     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 129   image->colors=colors;
 130   length=(size_t) colors;
 131   if (image->colormap == (PixelInfo *) NULL)
 132     image->colormap=(PixelInfo *) AcquireQuantumMemory(length,
 133       sizeof(*image->colormap));
 134   else
 135     image->colormap=(PixelInfo *) ResizeQuantumMemory(image->colormap,length,
 136       sizeof(*image->colormap));
 137   if (image->colormap == (PixelInfo *) NULL)
 138     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 139       image->filename);
 140   for (i=0; i < (ssize_t) image->colors; i++)
 141   {
 142     double
 143       pixel;
 144
 145     pixel=(double) (i*(QuantumRange/MagickMax(colors-1,1)));
 146     GetPixelInfo(image,image->colormap+i);
 147     image->colormap[i].matte=MagickTrue;
 148     image->colormap[i].red=pixel;
 149     image->colormap[i].green=pixel;
 150     image->colormap[i].blue=pixel;
 151     image->colormap[i].alpha=OpaqueAlpha;
 152   }
 153   return(SetImageStorageClass(image,PseudoClass,exception));
 154 }
 155 \f
 156 /*
 157 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 158 %                                                                             %
 159 %                                                                             %
 160 %                                                                             %
 161 %     C y c l e C o l o r m a p I m a g e                                     %
 162 %                                                                             %
 163 %                                                                             %
 164 %                                                                             %
 165 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 166 %
 167 %  CycleColormap() displaces an image's colormap by a given number of
 168 %  positions.  If you cycle the colormap a number of times you can produce
 169 %  a psychodelic effect.
 170 %
 171 %  WARNING: this assumes an images colormap is in a well know and defined
 172 %  order. Currently Imagemagick has no way of setting that order.
 173 %
 174 %  The format of the CycleColormapImage method is:
 175 %
 176 %      MagickBooleanType CycleColormapImage(Image *image,const ssize_t displace,
 177 %        ExceptionInfo *exception)
 178 %
 179 %  A description of each parameter follows:
 180 %
 181 %    o image: the image.
 182 %
 183 %    o displace:  displace the colormap this amount.
 184 %
 185 %    o exception: return any errors or warnings in this structure.
 186 %
 187 */
 188 MagickExport MagickBooleanType CycleColormapImage(Image *image,
 189   const ssize_t displace,ExceptionInfo *exception)
 190 {
 191   CacheView
 192     *image_view;
 193
 194   MagickBooleanType
 195     status;
 196
 197   ssize_t
 198     y;
 199
 200   assert(image != (Image *) NULL);
 201   assert(image->signature == MagickSignature);
 202   if (image->debug != MagickFalse)
 203     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 204   if (image->storage_class == DirectClass)
 205     (void) SetImageType(image,PaletteType,exception);
 206   status=MagickTrue;
 207   image_view=AcquireAuthenticCacheView(image,exception);
 208 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 209   #pragma omp parallel for schedule(static,4) shared(status) \
 210     dynamic_number_threads(image,image->columns,image->rows,1)
 211 #endif
 212   for (y=0; y < (ssize_t) image->rows; y++)
 213   {
 214     register ssize_t
 215       x;
 216
 217     register Quantum
 218       *restrict q;
 219
 220     ssize_t
 221       index;
 222
 223     if (status == MagickFalse)
 224       continue;
 225     q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
 226     if (q == (Quantum *) NULL)
 227       {
 228         status=MagickFalse;
 229         continue;
 230       }
 231     for (x=0; x < (ssize_t) image->columns; x++)
 232     {
 233       index=(ssize_t) (GetPixelIndex(image,q)+displace) % image->colors;
 234       if (index < 0)
 235         index+=(ssize_t) image->colors;
 236       SetPixelIndex(image,(Quantum) index,q);
 237       SetPixelInfoPixel(image,image->colormap+(ssize_t) index,q);
 238       q+=GetPixelChannels(image);
 239     }
 240     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
 241       status=MagickFalse;
 242   }
 243   image_view=DestroyCacheView(image_view);
 244   return(status);
 245 }
 246 \f
 247 /*
 248 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 249 %                                                                             %
 250 %                                                                             %
 251 %                                                                             %
 252 +   S o r t C o l o r m a p B y I n t e n s i t y                             %
 253 %                                                                             %
 254 %                                                                             %
 255 %                                                                             %
 256 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 257 %
 258 %  SortColormapByIntensity() sorts the colormap of a PseudoClass image by
 259 %  decreasing color intensity.
 260 %
 261 %  The format of the SortColormapByIntensity method is:
 262 %
 263 %      MagickBooleanType SortColormapByIntensity(Image *image,
 264 %        ExceptionInfo *exception)
 265 %
 266 %  A description of each parameter follows:
 267 %
 268 %    o image: A pointer to an Image structure.
 269 %
 270 %    o exception: return any errors or warnings in this structure.
 271 %
 272 */
 273
 274 #if defined(__cplusplus) || defined(c_plusplus)
 275 extern "C" {
 276 #endif
 277
 278 static int IntensityCompare(const void *x,const void *y)
 279 {
 280   const PixelInfo
 281     *color_1,
 282     *color_2;
 283
 284   int
 285     intensity;
 286
 287   color_1=(const PixelInfo *) x;
 288   color_2=(const PixelInfo *) y;
 289   intensity=(int) GetPixelInfoIntensity(color_2)-(int)
 290     GetPixelInfoIntensity(color_1);
 291   return(intensity);
 292 }
 293
 294 #if defined(__cplusplus) || defined(c_plusplus)
 295 }
 296 #endif
 297
 298 MagickExport MagickBooleanType SortColormapByIntensity(Image *image,
 299   ExceptionInfo *exception)
 300 {
 301   CacheView
 302     *image_view;
 303
 304   MagickBooleanType
 305     status;
 306
 307   register ssize_t
 308     i;
 309
 310   ssize_t
 311     y;
 312
 313   unsigned short
 314     *pixels;
 315
 316   assert(image != (Image *) NULL);
 317   if (image->debug != MagickFalse)
 318     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
 319   assert(image->signature == MagickSignature);
 320   if (image->storage_class != PseudoClass)
 321     return(MagickTrue);
 322   /*
 323     Allocate memory for pixel indexes.
 324   */
 325   pixels=(unsigned short *) AcquireQuantumMemory((size_t) image->colors,
 326     sizeof(*pixels));
 327   if (pixels == (unsigned short *) NULL)
 328     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 329       image->filename);
 330   /*
 331     Assign index values to colormap entries.
 332   */
 333 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 334   #pragma omp parallel for schedule(static,4) shared(status) \
 335     dynamic_number_threads(image,image->columns,1,1)
 336 #endif
 337   for (i=0; i < (ssize_t) image->colors; i++)
 338     image->colormap[i].alpha=(double) i;
 339   /*
 340     Sort image colormap by decreasing color popularity.
 341   */
 342   qsort((void *) image->colormap,(size_t) image->colors,
 343     sizeof(*image->colormap),IntensityCompare);
 344   /*
 345     Update image colormap indexes to sorted colormap order.
 346   */
 347 #if defined(MAGICKCORE_OPENMP_SUPPORT)
 348   #pragma omp parallel for schedule(static,4) shared(status)
 349 #endif
 350   for (i=0; i < (ssize_t) image->colors; i++)
 351     pixels[(ssize_t) image->colormap[i].alpha]=(unsigned short) i;
 352   status=MagickTrue;
 353   image_view=AcquireAuthenticCacheView(image,exception);
 354   for (y=0; y < (ssize_t) image->rows; y++)
 355   {
 356     Quantum
 357       index;
 358
 359     register ssize_t
 360       x;
 361
 362     register Quantum
 363       *restrict q;
 364
 365     q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
 366     if (q == (Quantum *) NULL)
 367       {
 368         status=MagickFalse;
 369         break;
 370       }
 371     for (x=0; x < (ssize_t) image->columns; x++)
 372     {
 373       index=(Quantum) pixels[(ssize_t) GetPixelIndex(image,q)];
 374       SetPixelIndex(image,index,q);
 375       SetPixelInfoPixel(image,image->colormap+(ssize_t) index,q);
 376       q+=GetPixelChannels(image);
 377     }
 378     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
 379       status=MagickFalse;
 380     if (status == MagickFalse)
 381       break;
 382   }
 383   image_view=DestroyCacheView(image_view);
 384   pixels=(unsigned short *) RelinquishMagickMemory(pixels);
 385   return(status);
 386 }