1 /* 2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 3 % % 4 % % 5 % % 6 % M M AAA PPPP % 7 % MM MM A A P P % 8 % M M M AAAAA PPPP % 9 % M M A A P % 10 % M M A A P % 11 % % 12 % % 13 % Read/Write Image Colormaps As An Image File. % 14 % % 15 % Software Design % 16 % Cristy % 17 % July 1992 % 18 % % 19 % % 20 % Copyright 1999-2016 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 % 37 */ 38 39 /* 41 Include declarations. 42 */ 43 #include "MagickCore/studio.h" 44 #include "MagickCore/attribute.h" 45 #include "MagickCore/blob.h" 46 #include "MagickCore/blob-private.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/colormap-private.h" 52 #include "MagickCore/colorspace.h" 53 #include "MagickCore/colorspace-private.h" 54 #include "MagickCore/exception.h" 55 #include "MagickCore/exception-private.h" 56 #include "MagickCore/histogram.h" 57 #include "MagickCore/image.h" 58 #include "MagickCore/image-private.h" 59 #include "MagickCore/list.h" 60 #include "MagickCore/magick.h" 61 #include "MagickCore/memory_.h" 62 #include "MagickCore/pixel-accessor.h" 63 #include "MagickCore/quantum-private.h" 64 #include "MagickCore/static.h" 65 #include "MagickCore/statistic.h" 66 #include "MagickCore/string_.h" 67 #include "MagickCore/module.h" 68 69 /* 71 Forward declarations. 72 */ 73 static MagickBooleanType 74 WriteMAPImage(const ImageInfo *,Image *,ExceptionInfo *); 75 76 /* 78 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 79 % % 80 % % 81 % % 82 % R e a d M A P I m a g e % 83 % % 84 % % 85 % % 86 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 87 % 88 % ReadMAPImage() reads an image of raw RGB colormap and colormap index 89 % bytes and returns it. It allocates the memory necessary for the new Image 90 % structure and returns a pointer to the new image. 91 % 92 % The format of the ReadMAPImage method is: 93 % 94 % Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception) 95 % 96 % A description of each parameter follows: 97 % 98 % o image_info: the image info. 99 % 100 % o exception: return any errors or warnings in this structure. 101 % 102 */ 103 static Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception) 104 { 105 Image 106 *image; 107 108 MagickBooleanType 109 status; 110 111 Quantum 112 index; 113 114 register ssize_t 115 x; 116 117 register Quantum 118 *q; 119 120 register ssize_t 121 i; 122 123 register unsigned char 124 *p; 125 126 size_t 127 depth, 128 packet_size, 129 quantum; 130 131 ssize_t 132 count, 133 y; 134 135 unsigned char 136 *colormap, 137 *pixels; 138 139 /* 140 Open image file. 141 */ 142 assert(image_info != (const ImageInfo *) NULL); 143 assert(image_info->signature == MagickCoreSignature); 144 if (image_info->debug != MagickFalse) 145 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s", 146 image_info->filename); 147 assert(exception != (ExceptionInfo *) NULL); 148 assert(exception->signature == MagickCoreSignature); 149 image=AcquireImage(image_info,exception); 150 if ((image->columns == 0) || (image->rows == 0)) 151 ThrowReaderException(OptionError,"MustSpecifyImageSize"); 152 status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception); 153 if (status == MagickFalse) 154 { 155 image=DestroyImageList(image); 156 return((Image *) NULL); 157 } 158 /* 159 Initialize image structure. 160 */ 161 image->storage_class=PseudoClass; 162 status=AcquireImageColormap(image,(size_t) 163 (image->offset != 0 ? image->offset : 256),exception); 164 if (status == MagickFalse) 165 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed"); 166 depth=GetImageQuantumDepth(image,MagickTrue); 167 packet_size=(size_t) (depth/8); 168 pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size* 169 sizeof(*pixels)); 170 packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL); 171 colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size* 172 sizeof(*colormap)); 173 if ((pixels == (unsigned char *) NULL) || 174 (colormap == (unsigned char *) NULL)) 175 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed"); 176 /* 177 Read image colormap. 178 */ 179 count=ReadBlob(image,packet_size*image->colors,colormap); 180 if (count != (ssize_t) (packet_size*image->colors)) 181 ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile"); 182 p=colormap; 183 if (image->depth <= 8) 184 for (i=0; i < (ssize_t) image->colors; i++) 185 { 186 image->colormap[i].red=ScaleCharToQuantum(*p++); 187 image->colormap[i].green=ScaleCharToQuantum(*p++); 188 image->colormap[i].blue=ScaleCharToQuantum(*p++); 189 } 190 else 191 for (i=0; i < (ssize_t) image->colors; i++) 192 { 193 quantum=(*p++ << 8); 194 quantum|=(*p++); 195 image->colormap[i].red=(Quantum) quantum; 196 quantum=(*p++ << 8); 197 quantum|=(*p++); 198 image->colormap[i].green=(Quantum) quantum; 199 quantum=(*p++ << 8); 200 quantum|=(*p++); 201 image->colormap[i].blue=(Quantum) quantum; 202 } 203 colormap=(unsigned char *) RelinquishMagickMemory(colormap); 204 if (image_info->ping != MagickFalse) 205 { 206 (void) CloseBlob(image); 207 return(GetFirstImageInList(image)); 208 } 209 status=SetImageExtent(image,image->columns,image->rows,exception); 210 if (status == MagickFalse) 211 return(DestroyImageList(image)); 212 /* 213 Read image pixels. 214 */ 215 packet_size=(size_t) (depth/8); 216 for (y=0; y < (ssize_t) image->rows; y++) 217 { 218 p=pixels; 219 q=QueueAuthenticPixels(image,0,y,image->columns,1,exception); 220 if (q == (Quantum *) NULL) 221 break; 222 count=ReadBlob(image,(size_t) packet_size*image->columns,pixels); 223 if (count != (ssize_t) (packet_size*image->columns)) 224 break; 225 for (x=0; x < (ssize_t) image->columns; x++) 226 { 227 index=ConstrainColormapIndex(image,*p,exception); 228 p++; 229 if (image->colors > 256) 230 { 231 index=ConstrainColormapIndex(image,((size_t) index << 8)+(*p), 232 exception); 233 p++; 234 } 235 SetPixelIndex(image,index,q); 236 SetPixelViaPixelInfo(image,image->colormap+(ssize_t) index,q); 237 q+=GetPixelChannels(image); 238 } 239 if (SyncAuthenticPixels(image,exception) == MagickFalse) 240 break; 241 } 242 pixels=(unsigned char *) RelinquishMagickMemory(pixels); 243 if (y < (ssize_t) image->rows) 244 ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile", 245 image->filename); 246 (void) CloseBlob(image); 247 return(GetFirstImageInList(image)); 248 } 249 250 /* 252 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 253 % % 254 % % 255 % % 256 % R e g i s t e r M A P I m a g e % 257 % % 258 % % 259 % % 260 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 261 % 262 % RegisterMAPImage() adds attributes for the MAP image format to 263 % the list of supported formats. The attributes include the image format 264 % tag, a method to read and/or write the format, whether the format 265 % supports the saving of more than one frame to the same file or blob, 266 % whether the format supports native in-memory I/O, and a brief 267 % description of the format. 268 % 269 % The format of the RegisterMAPImage method is: 270 % 271 % size_t RegisterMAPImage(void) 272 % 273 */ 274 ModuleExport size_t RegisterMAPImage(void) 275 { 276 MagickInfo 277 *entry; 278 279 entry=AcquireMagickInfo("MAP","MAP","Colormap intensities and indices"); 280 entry->decoder=(DecodeImageHandler *) ReadMAPImage; 281 entry->encoder=(EncodeImageHandler *) WriteMAPImage; 282 entry->flags^=CoderAdjoinFlag; 283 entry->format_type=ExplicitFormatType; 284 entry->flags|=CoderRawSupportFlag; 285 entry->flags|=CoderEndianSupportFlag; 286 (void) RegisterMagickInfo(entry); 287 return(MagickImageCoderSignature); 288 } 289 290 /* 292 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 293 % % 294 % % 295 % % 296 % U n r e g i s t e r M A P I m a g e % 297 % % 298 % % 299 % % 300 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 301 % 302 % UnregisterMAPImage() removes format registrations made by the 303 % MAP module from the list of supported formats. 304 % 305 % The format of the UnregisterMAPImage method is: 306 % 307 % UnregisterMAPImage(void) 308 % 309 */ 310 ModuleExport void UnregisterMAPImage(void) 311 { 312 (void) UnregisterMagickInfo("MAP"); 313 } 314 315 /* 317 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 318 % % 319 % % 320 % % 321 % W r i t e M A P I m a g e % 322 % % 323 % % 324 % % 325 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 326 % 327 % WriteMAPImage() writes an image to a file as red, green, and blue 328 % colormap bytes followed by the colormap indexes. 329 % 330 % The format of the WriteMAPImage method is: 331 % 332 % MagickBooleanType WriteMAPImage(const ImageInfo *image_info, 333 % Image *image,ExceptionInfo *exception) 334 % 335 % A description of each parameter follows. 336 % 337 % o image_info: the image info. 338 % 339 % o image: The image. 340 % 341 % o exception: return any errors or warnings in this structure. 342 % 343 */ 344 static MagickBooleanType WriteMAPImage(const ImageInfo *image_info,Image *image, 345 ExceptionInfo *exception) 346 { 347 MagickBooleanType 348 status; 349 350 register const Quantum 351 *p; 352 353 register ssize_t 354 i, 355 x; 356 357 register unsigned char 358 *q; 359 360 size_t 361 depth, 362 packet_size; 363 364 ssize_t 365 y; 366 367 unsigned char 368 *colormap, 369 *pixels; 370 371 /* 372 Open output image file. 373 */ 374 assert(image_info != (const ImageInfo *) NULL); 375 assert(image_info->signature == MagickCoreSignature); 376 assert(image != (Image *) NULL); 377 assert(image->signature == MagickCoreSignature); 378 if (image->debug != MagickFalse) 379 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename); 380 assert(exception != (ExceptionInfo *) NULL); 381 assert(exception->signature == MagickCoreSignature); 382 status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception); 383 if (status == MagickFalse) 384 return(status); 385 (void) TransformImageColorspace(image,sRGBColorspace,exception); 386 /* 387 Allocate colormap. 388 */ 389 if (IsPaletteImage(image) == MagickFalse) 390 (void) SetImageType(image,PaletteType,exception); 391 depth=GetImageQuantumDepth(image,MagickTrue); 392 packet_size=(size_t) (depth/8); 393 pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size* 394 sizeof(*pixels)); 395 packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL); 396 colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size* 397 sizeof(*colormap)); 398 if ((pixels == (unsigned char *) NULL) || 399 (colormap == (unsigned char *) NULL)) 400 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed"); 401 /* 402 Write colormap to file. 403 */ 404 q=colormap; 405 if (image->depth <= 8) 406 for (i=0; i < (ssize_t) image->colors; i++) 407 { 408 *q++=(unsigned char) image->colormap[i].red; 409 *q++=(unsigned char) image->colormap[i].green; 410 *q++=(unsigned char) image->colormap[i].blue; 411 } 412 else 413 for (i=0; i < (ssize_t) image->colors; i++) 414 { 415 *q++=(unsigned char) ((size_t) image->colormap[i].red >> 8); 416 *q++=(unsigned char) image->colormap[i].red; 417 *q++=(unsigned char) ((size_t) image->colormap[i].green >> 8); 418 *q++=(unsigned char) image->colormap[i].green; 419 *q++=(unsigned char) ((size_t) image->colormap[i].blue >> 8); 420 *q++=(unsigned char) image->colormap[i].blue; 421 } 422 (void) WriteBlob(image,packet_size*image->colors,colormap); 423 colormap=(unsigned char *) RelinquishMagickMemory(colormap); 424 /* 425 Write image pixels to file. 426 */ 427 for (y=0; y < (ssize_t) image->rows; y++) 428 { 429 p=GetVirtualPixels(image,0,y,image->columns,1,exception); 430 if (p == (const Quantum *) NULL) 431 break; 432 q=pixels; 433 for (x=0; x < (ssize_t) image->columns; x++) 434 { 435 if (image->colors > 256) 436 *q++=(unsigned char) ((size_t) GetPixelIndex(image,p) >> 8); 437 *q++=(unsigned char) GetPixelIndex(image,p); 438 p+=GetPixelChannels(image); 439 } 440 (void) WriteBlob(image,(size_t) (q-pixels),pixels); 441 } 442 pixels=(unsigned char *) RelinquishMagickMemory(pixels); 443 (void) CloseBlob(image); 444 return(status); 445 } 446
