2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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 %
13 % MagickCore Colormap Methods %
20 % Copyright 1999-2011 ImageMagick Studio LLC, a non-profit organization %
21 % dedicated to making software imaging solutions freely available. %
23 % You may not use this file except in compliance with the License. You may %
24 % obtain a copy of the License at %
26 % http://www.imagemagick.org/script/license.php %
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. %
34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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).
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"
72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
76 % A c q u i r e I m a g e C o l o r m a p %
80 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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.
87 % The format of the AcquireImageColormap method is:
89 % MagickBooleanType AcquireImageColormap(Image *image,
90 % const size_t colors,ExceptionInfo *exception)
92 % A description of each parameter follows:
96 % o colors: the number of colors in the image colormap.
98 % o exception: return any errors or warnings in this structure.
102 static inline size_t MagickMax(const size_t x,
110 MagickExport MagickBooleanType AcquireImageColormap(Image *image,
111 const size_t colors,ExceptionInfo *exception)
120 Allocate image colormap.
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 == (PixelPacket *) NULL)
129 image->colormap=(PixelPacket *) AcquireQuantumMemory(length,
130 sizeof(*image->colormap));
132 image->colormap=(PixelPacket *) ResizeQuantumMemory(image->colormap,length,
133 sizeof(*image->colormap));
134 if (image->colormap == (PixelPacket *) NULL)
135 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
137 for (i=0; i < (ssize_t) image->colors; i++)
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;
148 return(SetImageStorageClass(image,PseudoClass,&image->exception));
152 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
156 % C y c l e C o l o r m a p I m a g e %
160 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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.
166 % The format of the CycleColormapImage method is:
168 % MagickBooleanType CycleColormapImage(Image *image,const ssize_t displace,
169 % ExceptionInfo *exception)
171 % A description of each parameter follows:
173 % o image: the image.
175 % o displace: displace the colormap this amount.
177 % o exception: return any errors or warnings in this structure.
180 MagickExport MagickBooleanType CycleColormapImage(Image *image,
181 const ssize_t displace,ExceptionInfo *exception)
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);
199 image_view=AcquireCacheView(image);
200 #if defined(MAGICKCORE_OPENMP_SUPPORT)
201 #pragma omp parallel for schedule(dynamic,4) shared(status)
203 for (y=0; y < (ssize_t) image->rows; y++)
214 if (status == MagickFalse)
216 q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
217 if (q == (Quantum *) NULL)
222 for (x=0; x < (ssize_t) image->columns; x++)
224 index=(ssize_t) (GetPixelIndex(image,q)+displace) % image->colors;
226 index+=(ssize_t) image->colors;
227 SetPixelIndex(image,(Quantum) index,q);
228 SetPixelPacket(image,image->colormap+(ssize_t) index,q);
229 q+=GetPixelChannels(image);
231 if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
234 image_view=DestroyCacheView(image_view);
239 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
243 + S o r t C o l o r m a p B y I n t e n s i t y %
247 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
249 % SortColormapByIntensity() sorts the colormap of a PseudoClass image by
250 % decreasing color intensity.
252 % The format of the SortColormapByIntensity method is:
254 % MagickBooleanType SortColormapByIntensity(Image *image,
255 % ExceptionInfo *exception)
257 % A description of each parameter follows:
259 % o image: A pointer to an Image structure.
261 % o exception: return any errors or warnings in this structure.
265 #if defined(__cplusplus) || defined(c_plusplus)
269 static int IntensityCompare(const void *x,const void *y)
278 color_1=(const PixelPacket *) x;
279 color_2=(const PixelPacket *) y;
280 intensity=(int) GetPixelPacketIntensity(color_2)-(int)
281 GetPixelPacketIntensity(color_1);
285 #if defined(__cplusplus) || defined(c_plusplus)
289 MagickExport MagickBooleanType SortColormapByIntensity(Image *image,
290 ExceptionInfo *exception)
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)
314 Allocate memory for pixel indexes.
316 pixels=(unsigned short *) AcquireQuantumMemory((size_t) image->colors,
318 if (pixels == (unsigned short *) NULL)
319 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
322 Assign index values to colormap entries.
324 #if defined(MAGICKCORE_OPENMP_SUPPORT)
325 #pragma omp parallel for schedule(dynamic,4) shared(status)
327 for (i=0; i < (ssize_t) image->colors; i++)
328 image->colormap[i].alpha=(Quantum) i;
330 Sort image colormap by decreasing color popularity.
332 qsort((void *) image->colormap,(size_t) image->colors,
333 sizeof(*image->colormap),IntensityCompare);
335 Update image colormap indexes to sorted colormap order.
337 #if defined(MAGICKCORE_OPENMP_SUPPORT)
338 #pragma omp parallel for schedule(dynamic,4) shared(status)
340 for (i=0; i < (ssize_t) image->colors; i++)
341 pixels[(ssize_t) image->colormap[i].alpha]=(unsigned short) i;
343 image_view=AcquireCacheView(image);
344 for (y=0; y < (ssize_t) image->rows; y++)
355 q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
356 if (q == (Quantum *) NULL)
361 for (x=0; x < (ssize_t) image->columns; x++)
363 index=(Quantum) pixels[(ssize_t) GetPixelIndex(image,q)];
364 SetPixelIndex(image,index,q);
365 SetPixelPacket(image,image->colormap+(ssize_t) index,q);
366 q+=GetPixelChannels(image);
368 if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
370 if (status == MagickFalse)
373 image_view=DestroyCacheView(image_view);
374 pixels=(unsigned short *) RelinquishMagickMemory(pixels);