2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
13 % Read/Write Image Colormaps as an Image File. %
20 % Copyright 1999-2019 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 % https://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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
42 #include "MagickCore/studio.h"
43 #include "MagickCore/attribute.h"
44 #include "MagickCore/blob.h"
45 #include "MagickCore/blob-private.h"
46 #include "MagickCore/cache.h"
47 #include "MagickCore/color.h"
48 #include "MagickCore/color-private.h"
49 #include "MagickCore/colormap.h"
50 #include "MagickCore/colormap-private.h"
51 #include "MagickCore/colorspace.h"
52 #include "MagickCore/colorspace-private.h"
53 #include "MagickCore/exception.h"
54 #include "MagickCore/exception-private.h"
55 #include "MagickCore/histogram.h"
56 #include "MagickCore/image.h"
57 #include "MagickCore/image-private.h"
58 #include "MagickCore/list.h"
59 #include "MagickCore/magick.h"
60 #include "MagickCore/memory_.h"
61 #include "MagickCore/pixel-accessor.h"
62 #include "MagickCore/quantum-private.h"
63 #include "MagickCore/static.h"
64 #include "MagickCore/statistic.h"
65 #include "MagickCore/string_.h"
66 #include "MagickCore/module.h"
71 static MagickBooleanType
72 WriteMAPImage(const ImageInfo *,Image *,ExceptionInfo *);
75 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
79 % R e a d M A P I m a g e %
83 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
85 % ReadMAPImage() reads an image of raw RGB colormap and colormap index
86 % bytes and returns it. It allocates the memory necessary for the new Image
87 % structure and returns a pointer to the new image.
89 % The format of the ReadMAPImage method is:
91 % Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
93 % A description of each parameter follows:
95 % o image_info: the image info.
97 % o exception: return any errors or warnings in this structure.
100 static Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
120 register unsigned char
139 assert(image_info != (const ImageInfo *) NULL);
140 assert(image_info->signature == MagickCoreSignature);
141 if (image_info->debug != MagickFalse)
142 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
143 image_info->filename);
144 assert(exception != (ExceptionInfo *) NULL);
145 assert(exception->signature == MagickCoreSignature);
146 image=AcquireImage(image_info,exception);
147 if ((image->columns == 0) || (image->rows == 0))
148 ThrowReaderException(OptionError,"MustSpecifyImageSize");
149 status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
150 if (status == MagickFalse)
152 image=DestroyImageList(image);
153 return((Image *) NULL);
156 Initialize image structure.
158 image->storage_class=PseudoClass;
159 status=AcquireImageColormap(image,(size_t)
160 (image->offset != 0 ? image->offset : 256),exception);
161 if (status == MagickFalse)
162 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
163 depth=GetImageQuantumDepth(image,MagickTrue);
164 packet_size=(size_t) (depth/8);
165 pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
167 packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
168 colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
170 if ((pixels == (unsigned char *) NULL) ||
171 (colormap == (unsigned char *) NULL))
173 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
174 colormap=(unsigned char *) RelinquishMagickMemory(colormap);
175 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
180 count=ReadBlob(image,packet_size*image->colors,colormap);
181 if (count != (ssize_t) (packet_size*image->colors))
183 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
184 colormap=(unsigned char *) RelinquishMagickMemory(colormap);
185 ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
188 if (image->depth <= 8)
189 for (i=0; i < (ssize_t) image->colors; i++)
191 image->colormap[i].red=ScaleCharToQuantum(*p++);
192 image->colormap[i].green=ScaleCharToQuantum(*p++);
193 image->colormap[i].blue=ScaleCharToQuantum(*p++);
196 for (i=0; i < (ssize_t) image->colors; i++)
200 image->colormap[i].red=(Quantum) quantum;
203 image->colormap[i].green=(Quantum) quantum;
206 image->colormap[i].blue=(Quantum) quantum;
208 colormap=(unsigned char *) RelinquishMagickMemory(colormap);
209 if (image_info->ping != MagickFalse)
211 (void) CloseBlob(image);
212 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
213 return(GetFirstImageInList(image));
215 status=SetImageExtent(image,image->columns,image->rows,exception);
216 if (status == MagickFalse)
218 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
219 return(DestroyImageList(image));
224 packet_size=(size_t) (depth/8);
225 for (y=0; y < (ssize_t) image->rows; y++)
228 q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
229 if (q == (Quantum *) NULL)
231 count=ReadBlob(image,(size_t) packet_size*image->columns,pixels);
232 if (count != (ssize_t) (packet_size*image->columns))
234 for (x=0; x < (ssize_t) image->columns; x++)
236 index=ConstrainColormapIndex(image,*p,exception);
238 if (image->colors > 256)
240 index=ConstrainColormapIndex(image,((size_t) index << 8)+(*p),
244 SetPixelIndex(image,index,q);
245 SetPixelViaPixelInfo(image,image->colormap+(ssize_t) index,q);
246 q+=GetPixelChannels(image);
248 if (SyncAuthenticPixels(image,exception) == MagickFalse)
251 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
252 if (y < (ssize_t) image->rows)
253 ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
255 (void) CloseBlob(image);
256 return(GetFirstImageInList(image));
260 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
264 % R e g i s t e r M A P I m a g e %
268 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
270 % RegisterMAPImage() adds attributes for the MAP image format to
271 % the list of supported formats. The attributes include the image format
272 % tag, a method to read and/or write the format, whether the format
273 % supports the saving of more than one frame to the same file or blob,
274 % whether the format supports native in-memory I/O, and a brief
275 % description of the format.
277 % The format of the RegisterMAPImage method is:
279 % size_t RegisterMAPImage(void)
282 ModuleExport size_t RegisterMAPImage(void)
287 entry=AcquireMagickInfo("MAP","MAP","Colormap intensities and indices");
288 entry->decoder=(DecodeImageHandler *) ReadMAPImage;
289 entry->encoder=(EncodeImageHandler *) WriteMAPImage;
290 entry->flags^=CoderAdjoinFlag;
291 entry->format_type=ExplicitFormatType;
292 entry->flags|=CoderRawSupportFlag;
293 entry->flags|=CoderEndianSupportFlag;
294 (void) RegisterMagickInfo(entry);
295 return(MagickImageCoderSignature);
299 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
303 % U n r e g i s t e r M A P I m a g e %
307 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
309 % UnregisterMAPImage() removes format registrations made by the
310 % MAP module from the list of supported formats.
312 % The format of the UnregisterMAPImage method is:
314 % UnregisterMAPImage(void)
317 ModuleExport void UnregisterMAPImage(void)
319 (void) UnregisterMagickInfo("MAP");
323 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
327 % W r i t e M A P I m a g e %
331 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
333 % WriteMAPImage() writes an image to a file as red, green, and blue
334 % colormap bytes followed by the colormap indexes.
336 % The format of the WriteMAPImage method is:
338 % MagickBooleanType WriteMAPImage(const ImageInfo *image_info,
339 % Image *image,ExceptionInfo *exception)
341 % A description of each parameter follows.
343 % o image_info: the image info.
345 % o image: The image.
347 % o exception: return any errors or warnings in this structure.
350 static MagickBooleanType WriteMAPImage(const ImageInfo *image_info,Image *image,
351 ExceptionInfo *exception)
356 register const Quantum
363 register unsigned char
378 Open output image file.
380 assert(image_info != (const ImageInfo *) NULL);
381 assert(image_info->signature == MagickCoreSignature);
382 assert(image != (Image *) NULL);
383 assert(image->signature == MagickCoreSignature);
384 if (image->debug != MagickFalse)
385 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
386 assert(exception != (ExceptionInfo *) NULL);
387 assert(exception->signature == MagickCoreSignature);
388 status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
389 if (status == MagickFalse)
391 (void) TransformImageColorspace(image,sRGBColorspace,exception);
395 if (SetImageType(image,PaletteType,exception) == MagickFalse)
396 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
397 depth=GetImageQuantumDepth(image,MagickTrue);
398 packet_size=(size_t) (depth/8);
399 pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
401 packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
402 colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
404 if ((pixels == (unsigned char *) NULL) ||
405 (colormap == (unsigned char *) NULL))
407 if (colormap != (unsigned char *) NULL)
408 colormap=(unsigned char *) RelinquishMagickMemory(colormap);
409 if (pixels != (unsigned char *) NULL)
410 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
411 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
414 Write colormap to file.
417 if (image->colors <= 256)
418 for (i=0; i < (ssize_t) image->colors; i++)
420 *q++=(unsigned char) ScaleQuantumToChar(image->colormap[i].red);
421 *q++=(unsigned char) ScaleQuantumToChar(image->colormap[i].green);
422 *q++=(unsigned char) ScaleQuantumToChar(image->colormap[i].blue);
425 for (i=0; i < (ssize_t) image->colors; i++)
427 *q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].red) >> 8);
428 *q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].red) & 0xff);
429 *q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].green) >> 8);
430 *q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].green) &
432 *q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].blue) >> 8);
433 *q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].blue) &
436 (void) WriteBlob(image,packet_size*image->colors,colormap);
437 colormap=(unsigned char *) RelinquishMagickMemory(colormap);
439 Write image pixels to file.
441 for (y=0; y < (ssize_t) image->rows; y++)
443 p=GetVirtualPixels(image,0,y,image->columns,1,exception);
444 if (p == (const Quantum *) NULL)
447 for (x=0; x < (ssize_t) image->columns; x++)
449 if (image->colors > 256)
450 *q++=(unsigned char) ((size_t) GetPixelIndex(image,p) >> 8);
451 *q++=(unsigned char) GetPixelIndex(image,p);
452 p+=GetPixelChannels(image);
454 (void) WriteBlob(image,(size_t) (q-pixels),pixels);
456 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
457 (void) CloseBlob(image);