2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
13 % Read/Write Image Colormaps As An Image File. %
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 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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 *);
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 == MagickSignature);
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 == MagickSignature);
146 image=AcquireImage(image_info);
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));
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))
172 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
176 count=ReadBlob(image,packet_size*image->colors,colormap);
177 if (count != (ssize_t) (packet_size*image->colors))
178 ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
180 if (image->depth <= 8)
181 for (i=0; i < (ssize_t) image->colors; i++)
183 image->colormap[i].red=ScaleCharToQuantum(*p++);
184 image->colormap[i].green=ScaleCharToQuantum(*p++);
185 image->colormap[i].blue=ScaleCharToQuantum(*p++);
188 for (i=0; i < (ssize_t) image->colors; i++)
192 image->colormap[i].red=(Quantum) quantum;
195 image->colormap[i].green=(Quantum) quantum;
198 image->colormap[i].blue=(Quantum) quantum;
200 colormap=(unsigned char *) RelinquishMagickMemory(colormap);
201 if (image_info->ping != MagickFalse)
203 (void) CloseBlob(image);
204 return(GetFirstImageInList(image));
209 packet_size=(size_t) (depth/8);
210 for (y=0; y < (ssize_t) image->rows; y++)
213 q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
214 if (q == (const Quantum *) NULL)
216 count=ReadBlob(image,(size_t) packet_size*image->columns,pixels);
217 if (count != (ssize_t) (packet_size*image->columns))
219 for (x=0; x < (ssize_t) image->columns; x++)
221 index=ConstrainColormapIndex(image,*p);
223 if (image->colors > 256)
225 index=ConstrainColormapIndex(image,((size_t) index << 8)+(*p));
228 SetPixelIndex(image,index,q);
229 SetPixelPacket(image,image->colormap+(ssize_t) index,q);
230 q+=GetPixelChannels(image);
232 if (SyncAuthenticPixels(image,exception) == MagickFalse)
235 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
236 if (y < (ssize_t) image->rows)
237 ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
239 (void) CloseBlob(image);
240 return(GetFirstImageInList(image));
244 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
248 % R e g i s t e r M A P I m a g e %
252 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
254 % RegisterMAPImage() adds attributes for the MAP image format to
255 % the list of supported formats. The attributes include the image format
256 % tag, a method to read and/or write the format, whether the format
257 % supports the saving of more than one frame to the same file or blob,
258 % whether the format supports native in-memory I/O, and a brief
259 % description of the format.
261 % The format of the RegisterMAPImage method is:
263 % size_t RegisterMAPImage(void)
266 ModuleExport size_t RegisterMAPImage(void)
271 entry=SetMagickInfo("MAP");
272 entry->decoder=(DecodeImageHandler *) ReadMAPImage;
273 entry->encoder=(EncodeImageHandler *) WriteMAPImage;
274 entry->adjoin=MagickFalse;
275 entry->format_type=ExplicitFormatType;
276 entry->raw=MagickTrue;
277 entry->endian_support=MagickTrue;
278 entry->description=ConstantString("Colormap intensities and indices");
279 entry->module=ConstantString("MAP");
280 (void) RegisterMagickInfo(entry);
281 return(MagickImageCoderSignature);
285 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
289 % U n r e g i s t e r M A P I m a g e %
293 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
295 % UnregisterMAPImage() removes format registrations made by the
296 % MAP module from the list of supported formats.
298 % The format of the UnregisterMAPImage method is:
300 % UnregisterMAPImage(void)
303 ModuleExport void UnregisterMAPImage(void)
305 (void) UnregisterMagickInfo("MAP");
309 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
313 % W r i t e M A P I m a g e %
317 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
319 % WriteMAPImage() writes an image to a file as red, green, and blue
320 % colormap bytes followed by the colormap indexes.
322 % The format of the WriteMAPImage method is:
324 % MagickBooleanType WriteMAPImage(const ImageInfo *image_info,Image *image)
326 % A description of each parameter follows.
328 % o image_info: the image info.
330 % o image: The image.
334 static MagickBooleanType WriteMAPImage(const ImageInfo *image_info,Image *image)
339 register const Quantum
346 register unsigned char
361 Open output image file.
363 assert(image_info != (const ImageInfo *) NULL);
364 assert(image_info->signature == MagickSignature);
365 assert(image != (Image *) NULL);
366 assert(image->signature == MagickSignature);
367 if (image->debug != MagickFalse)
368 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
369 status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
370 if (status == MagickFalse)
372 if (IsRGBColorspace(image->colorspace) == MagickFalse)
373 (void) TransformImageColorspace(image,RGBColorspace);
377 if (IsPaletteImage(image,&image->exception) == MagickFalse)
378 (void) SetImageType(image,PaletteType);
379 depth=GetImageQuantumDepth(image,MagickTrue);
380 packet_size=(size_t) (depth/8);
381 pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
383 packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
384 colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
386 if ((pixels == (unsigned char *) NULL) ||
387 (colormap == (unsigned char *) NULL))
388 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
390 Write colormap to file.
393 if (image->depth <= 8)
394 for (i=0; i < (ssize_t) image->colors; i++)
396 *q++=(unsigned char) image->colormap[i].red;
397 *q++=(unsigned char) image->colormap[i].green;
398 *q++=(unsigned char) image->colormap[i].blue;
401 for (i=0; i < (ssize_t) image->colors; i++)
403 *q++=(unsigned char) ((size_t) image->colormap[i].red >> 8);
404 *q++=(unsigned char) image->colormap[i].red;
405 *q++=(unsigned char) ((size_t) image->colormap[i].green >> 8);
406 *q++=(unsigned char) image->colormap[i].green;
407 *q++=(unsigned char) ((size_t) image->colormap[i].blue >> 8);
408 *q++=(unsigned char) image->colormap[i].blue;
410 (void) WriteBlob(image,packet_size*image->colors,colormap);
411 colormap=(unsigned char *) RelinquishMagickMemory(colormap);
413 Write image pixels to file.
415 for (y=0; y < (ssize_t) image->rows; y++)
417 p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
418 if (p == (const Quantum *) NULL)
421 for (x=0; x < (ssize_t) image->columns; x++)
423 if (image->colors > 256)
424 *q++=(unsigned char) ((size_t) GetPixelIndex(image,p) >> 8);
425 *q++=(unsigned char) GetPixelIndex(image,p);
426 p+=GetPixelChannels(image);
428 (void) WriteBlob(image,(size_t) (q-pixels),pixels);
430 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
431 (void) CloseBlob(image);