1 /*
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 % %
4 % %
5 % %
6 % GGGG RRRR AAA Y Y %
7 % G R R A A Y Y %
8 % G GG RRRR AAAAA Y %
9 % G G R R A A Y %
10 % GGG R R A A Y %
11 % %
12 % %
13 % Read/Write RAW Gray Image Format %
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 /*
40 Include declarations.
41 */
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/colorspace.h"
48 #include "MagickCore/colorspace-private.h"
49 #include "MagickCore/constitute.h"
50 #include "MagickCore/exception.h"
51 #include "MagickCore/exception-private.h"
52 #include "MagickCore/image.h"
53 #include "MagickCore/image-private.h"
54 #include "MagickCore/list.h"
55 #include "MagickCore/magick.h"
56 #include "MagickCore/memory_.h"
57 #include "MagickCore/monitor.h"
58 #include "MagickCore/monitor-private.h"
59 #include "MagickCore/pixel.h"
60 #include "MagickCore/pixel-accessor.h"
61 #include "MagickCore/quantum-private.h"
62 #include "MagickCore/static.h"
63 #include "MagickCore/statistic.h"
64 #include "MagickCore/string_.h"
65 #include "MagickCore/module.h"
66
67 /*
68 Forward declarations.
69 */
70 static MagickBooleanType
71 WriteGRAYImage(const ImageInfo *,Image *,ExceptionInfo *);
72
73 /*
74 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
75 % %
76 % %
77 % %
78 % R e a d G R A Y I m a g e %
79 % %
80 % %
81 % %
82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
83 %
84 % ReadGRAYImage() reads an image of raw grayscale samples and returns
85 % it. It allocates the memory necessary for the new Image structure and
86 % returns a pointer to the new image.
87 %
88 % The format of the ReadGRAYImage method is:
89 %
90 % Image *ReadGRAYImage(const ImageInfo *image_info,
91 % ExceptionInfo *exception)
92 %
93 % A description of each parameter follows:
94 %
95 % o image_info: the image info.
96 %
97 % o exception: return any errors or warnings in this structure.
98 %
99 */
ReadGRAYImage(const ImageInfo * image_info,ExceptionInfo * exception)100 static Image *ReadGRAYImage(const ImageInfo *image_info,
101 ExceptionInfo *exception)
102 {
103 const unsigned char
104 *pixels;
105
106 Image
107 *canvas_image,
108 *image;
109
110 MagickBooleanType
111 status;
112
113 MagickOffsetType
114 scene;
115
116 QuantumInfo
117 *quantum_info;
118
119 QuantumType
120 quantum_type;
121
122 size_t
123 length;
124
125 ssize_t
126 count,
127 y;
128
129 /*
130 Open image file.
131 */
132 assert(image_info != (const ImageInfo *) NULL);
133 assert(image_info->signature == MagickCoreSignature);
134 if (image_info->debug != MagickFalse)
135 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
136 image_info->filename);
137 assert(exception != (ExceptionInfo *) NULL);
138 assert(exception->signature == MagickCoreSignature);
139 image=AcquireImage(image_info,exception);
140 if ((image->columns == 0) || (image->rows == 0))
141 ThrowReaderException(OptionError,"MustSpecifyImageSize");
142 status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
143 if (status == MagickFalse)
144 {
145 image=DestroyImageList(image);
146 return((Image *) NULL);
147 }
148 if (DiscardBlobBytes(image,(size_t) image->offset) == MagickFalse)
149 ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
150 image->filename);
151 /*
152 Create virtual canvas to support cropping (i.e. image.gray[100x100+10+20]).
153 */
154 SetImageColorspace(image,GRAYColorspace,exception);
155 canvas_image=CloneImage(image,image->extract_info.width,1,MagickFalse,
156 exception);
157 (void) SetImageVirtualPixelMethod(canvas_image,BlackVirtualPixelMethod,
158 exception);
159 quantum_type=GrayQuantum;
160 quantum_info=AcquireQuantumInfo(image_info,canvas_image);
161 if (quantum_info == (QuantumInfo *) NULL)
162 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
163 pixels=(const unsigned char *) NULL;
164 if (image_info->number_scenes != 0)
165 while (image->scene < image_info->scene)
166 {
167 /*
168 Skip to next image.
169 */
170 image->scene++;
171 length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
172 for (y=0; y < (ssize_t) image->rows; y++)
173 {
174 pixels=(const unsigned char *) ReadBlobStream(image,length,
175 GetQuantumPixels(quantum_info),&count);
176 if (count != (ssize_t) length)
177 break;
178 }
179 }
180 scene=0;
181 count=0;
182 length=0;
183 do
184 {
185 /*
186 Read pixels to virtual canvas image then push to image.
187 */
188 if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
189 if (image->scene >= (image_info->scene+image_info->number_scenes-1))
190 break;
191 status=SetImageExtent(image,image->columns,image->rows,exception);
192 if (status == MagickFalse)
193 return(DestroyImageList(image));
194 SetImageColorspace(image,GRAYColorspace,exception);
195 if (scene == 0)
196 {
197 length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
198 pixels=(const unsigned char *) ReadBlobStream(image,length,
199 GetQuantumPixels(quantum_info),&count);
200 }
201 for (y=0; y < (ssize_t) image->extract_info.height; y++)
202 {
203 register const Quantum
204 *magick_restrict p;
205
206 register ssize_t
207 x;
208
209 register Quantum
210 *magick_restrict q;
211
212 if (count != (ssize_t) length)
213 {
214 ThrowFileException(exception,CorruptImageError,
215 "UnexpectedEndOfFile",image->filename);
216 break;
217 }
218 q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,exception);
219 if (q == (Quantum *) NULL)
220 break;
221 length=ImportQuantumPixels(canvas_image,(CacheView *) NULL,quantum_info,
222 quantum_type,pixels,exception);
223 if (SyncAuthenticPixels(canvas_image,exception) == MagickFalse)
224 break;
225 if (((y-image->extract_info.y) >= 0) &&
226 ((y-image->extract_info.y) < (ssize_t) image->rows))
227 {
228 p=GetVirtualPixels(canvas_image,canvas_image->extract_info.x,0,
229 image->columns,1,exception);
230 q=QueueAuthenticPixels(image,0,y-image->extract_info.y,image->columns,
231 1,exception);
232 if ((p == (const Quantum *) NULL) ||
233 (q == (Quantum *) NULL))
234 break;
235 for (x=0; x < (ssize_t) image->columns; x++)
236 {
237 SetPixelGray(image,GetPixelGray(canvas_image,p),q);
238 p+=GetPixelChannels(canvas_image);
239 q+=GetPixelChannels(image);
240 }
241 if (SyncAuthenticPixels(image,exception) == MagickFalse)
242 break;
243 }
244 if (image->previous == (Image *) NULL)
245 {
246 status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
247 image->rows);
248 if (status == MagickFalse)
249 break;
250 }
251 pixels=(const unsigned char *) ReadBlobStream(image,length,
252 GetQuantumPixels(quantum_info),&count);
253 }
254 SetQuantumImageType(image,quantum_type);
255 /*
256 Proceed to next image.
257 */
258 if (image_info->number_scenes != 0)
259 if (image->scene >= (image_info->scene+image_info->number_scenes-1))
260 break;
261 if (count == (ssize_t) length)
262 {
263 /*
264 Allocate next image structure.
265 */
266 AcquireNextImage(image_info,image,exception);
267 if (GetNextImageInList(image) == (Image *) NULL)
268 {
269 image=DestroyImageList(image);
270 return((Image *) NULL);
271 }
272 image=SyncNextImageInList(image);
273 status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
274 GetBlobSize(image));
275 if (status == MagickFalse)
276 break;
277 }
278 scene++;
279 } while (count == (ssize_t) length);
280 quantum_info=DestroyQuantumInfo(quantum_info);
281 canvas_image=DestroyImage(canvas_image);
282 (void) CloseBlob(image);
283 return(GetFirstImageInList(image));
284 }
285
286 /*
287 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
288 % %
289 % %
290 % %
291 % R e g i s t e r G R A Y I m a g e %
292 % %
293 % %
294 % %
295 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
296 %
297 % RegisterGRAYImage() adds attributes for the GRAY image format to
298 % the list of supported formats. The attributes include the image format
299 % tag, a method to read and/or write the format, whether the format
300 % supports the saving of more than one frame to the same file or blob,
301 % whether the format supports native in-memory I/O, and a brief
302 % description of the format.
303 %
304 % The format of the RegisterGRAYImage method is:
305 %
306 % size_t RegisterGRAYImage(void)
307 %
308 */
RegisterGRAYImage(void)309 ModuleExport size_t RegisterGRAYImage(void)
310 {
311 MagickInfo
312 *entry;
313
314 entry=AcquireMagickInfo("GRAY","GRAY","Raw gray samples");
315 entry->decoder=(DecodeImageHandler *) ReadGRAYImage;
316 entry->encoder=(EncodeImageHandler *) WriteGRAYImage;
317 entry->flags|=CoderRawSupportFlag;
318 entry->flags|=CoderEndianSupportFlag;
319 (void) RegisterMagickInfo(entry);
320 return(MagickImageCoderSignature);
321 }
322
323 /*
324 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
325 % %
326 % %
327 % %
328 % U n r e g i s t e r G R A Y I m a g e %
329 % %
330 % %
331 % %
332 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
333 %
334 % UnregisterGRAYImage() removes format registrations made by the
335 % GRAY module from the list of supported formats.
336 %
337 % The format of the UnregisterGRAYImage method is:
338 %
339 % UnregisterGRAYImage(void)
340 %
341 */
UnregisterGRAYImage(void)342 ModuleExport void UnregisterGRAYImage(void)
343 {
344 (void) UnregisterMagickInfo("GRAY");
345 }
346
347 /*
348 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
349 % %
350 % %
351 % %
352 % W r i t e G R A Y I m a g e %
353 % %
354 % %
355 % %
356 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
357 %
358 % WriteGRAYImage() writes an image to a file as gray scale intensity
359 % values.
360 %
361 % The format of the WriteGRAYImage method is:
362 %
363 % MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
364 % Image *image,ExceptionInfo *exception)
365 %
366 % A description of each parameter follows.
367 %
368 % o image_info: the image info.
369 %
370 % o image: The image.
371 %
372 % o exception: return any errors or warnings in this structure.
373 %
374 */
WriteGRAYImage(const ImageInfo * image_info,Image * image,ExceptionInfo * exception)375 static MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
376 Image *image,ExceptionInfo *exception)
377 {
378 MagickBooleanType
379 status;
380
381 MagickOffsetType
382 scene;
383
384 QuantumInfo
385 *quantum_info;
386
387 QuantumType
388 quantum_type;
389
390 size_t
391 length;
392
393 ssize_t
394 count,
395 y;
396
397 unsigned char
398 *pixels;
399
400 /*
401 Open output image file.
402 */
403 assert(image_info != (const ImageInfo *) NULL);
404 assert(image_info->signature == MagickCoreSignature);
405 assert(image != (Image *) NULL);
406 assert(image->signature == MagickCoreSignature);
407 if (image->debug != MagickFalse)
408 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
409 assert(exception != (ExceptionInfo *) NULL);
410 assert(exception->signature == MagickCoreSignature);
411 status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
412 if (status == MagickFalse)
413 return(status);
414 scene=0;
415 do
416 {
417 /*
418 Write grayscale pixels.
419 */
420 (void) TransformImageColorspace(image,sRGBColorspace,exception);
421 quantum_type=GrayQuantum;
422 quantum_info=AcquireQuantumInfo(image_info,image);
423 if (quantum_info == (QuantumInfo *) NULL)
424 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
425 pixels=(unsigned char *) GetQuantumPixels(quantum_info);
426 for (y=0; y < (ssize_t) image->rows; y++)
427 {
428 register const Quantum
429 *magick_restrict p;
430
431 p=GetVirtualPixels(image,0,y,image->columns,1,exception);
432 if (p == (const Quantum *) NULL)
433 break;
434 length=ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
435 quantum_type,pixels,exception);
436 count=WriteBlob(image,length,pixels);
437 if (count != (ssize_t) length)
438 break;
439 if (image->previous == (Image *) NULL)
440 {
441 status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
442 image->rows);
443 if (status == MagickFalse)
444 break;
445 }
446 }
447 quantum_info=DestroyQuantumInfo(quantum_info);
448 if (GetNextImageInList(image) == (Image *) NULL)
449 break;
450 image=SyncNextImageInList(image);
451 status=SetImageProgress(image,SaveImagesTag,scene++,
452 GetImageListLength(image));
453 if (status == MagickFalse)
454 break;
455 } while (image_info->adjoin != MagickFalse);
456 (void) CloseBlob(image);
457 return(MagickTrue);
458 }
459