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gerrit-public.fairphone.software / platform / external / ImageMagick / 94f2007ae3b0c364b710bc5396ede341db4a4b97 / . / coders / gray.c
blob: 8802d2df290528d6a9fd7d2bd6258d322d0d04f2 [file] [log] [blame]
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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% John Cristy %
17% July 1992 %
18% %
19% %
20% Copyright 1999-2009 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 "magick/studio.h"
43#include "magick/blob.h"
44#include "magick/blob-private.h"
45#include "magick/cache.h"
46#include "magick/colorspace.h"
47#include "magick/constitute.h"
48#include "magick/exception.h"
49#include "magick/exception-private.h"
50#include "magick/image.h"
51#include "magick/image-private.h"
52#include "magick/list.h"
53#include "magick/magick.h"
54#include "magick/memory_.h"
55#include "magick/monitor.h"
56#include "magick/monitor-private.h"
57#include "magick/pixel.h"
58#include "magick/pixel-private.h"
59#include "magick/quantum-private.h"
60#include "magick/static.h"
61#include "magick/statistic.h"
62#include "magick/string_.h"
63#include "magick/module.h"
64
65/*
66 Forward declarations.
67*/
68static MagickBooleanType
69 WriteGRAYImage(const ImageInfo *,Image *);
70
71/*
72%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
73% %
74% %
75% %
76% R e a d G R A Y I m a g e %
77% %
78% %
79% %
80%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
81%
82% ReadGRAYImage() reads an image of raw grayscale samples and returns
83% it. It allocates the memory necessary for the new Image structure and
84% returns a pointer to the new image.
85%
86% The format of the ReadGRAYImage method is:
87%
88% Image *ReadGRAYImage(const ImageInfo *image_info,
89% ExceptionInfo *exception)
90%
91% A description of each parameter follows:
92%
93% o image_info: the image info.
94%
95% o exception: return any errors or warnings in this structure.
96%
97*/
98static Image *ReadGRAYImage(const ImageInfo *image_info,
99 ExceptionInfo *exception)
100{
101 Image
102 *canvas_image,
103 *image;
104
105 long
106 y;
107
108 MagickBooleanType
109 status;
110
111 MagickOffsetType
112 scene;
113
114 QuantumInfo
115 *quantum_info;
116
117 QuantumType
118 quantum_type;
119
120 register long
121 i;
122
123 ssize_t
124 count;
125
126 size_t
127 length;
128
129 unsigned char
130 *pixels;
131
132 /*
133 Open image file.
134 */
135 assert(image_info != (const ImageInfo *) NULL);
136 assert(image_info->signature == MagickSignature);
137 if (image_info->debug != MagickFalse)
138 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
139 image_info->filename);
140 assert(exception != (ExceptionInfo *) NULL);
141 assert(exception->signature == MagickSignature);
142 image=AcquireImage(image_info);
143 if ((image->columns == 0) || (image->rows == 0))
144 ThrowReaderException(OptionError,"MustSpecifyImageSize");
145 status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
146 if (status == MagickFalse)
147 {
148 image=DestroyImageList(image);
149 return((Image *) NULL);
150 }
151 for (i=0; i < image->offset; i++)
152 if (ReadBlobByte(image) == EOF)
153 {
154 ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
155 image->filename);
156 break;
157 }
158 /*
159 Create virtual canvas to support cropping (i.e. image.gray[100x100+10+20]).
160 */
161 canvas_image=CloneImage(image,image->extract_info.width,1,MagickFalse,
162 exception);
163 (void) SetImageVirtualPixelMethod(canvas_image,BlackVirtualPixelMethod);
164 quantum_type=GrayQuantum;
165 quantum_info=AcquireQuantumInfo(image_info,canvas_image);
166 if (quantum_info == (QuantumInfo *) NULL)
167 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
168 pixels=GetQuantumPixels(quantum_info);
169 if (image_info->number_scenes != 0)
170 while (image->scene < image_info->scene)
171 {
172 /*
173 Skip to next image.
174 */
175 image->scene++;
176 length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
177 for (y=0; y < (long) image->rows; y++)
178 {
179 count=ReadBlob(image,length,pixels);
180 if (count != (ssize_t) length)
181 break;
182 }
183 }
184 scene=0;
185 count=0;
186 length=0;
187 do
188 {
189 /*
190 Read pixels to virtual canvas image then push to image.
191 */
192 if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
193 if (image->scene >= (image_info->scene+image_info->number_scenes-1))
194 break;
195 if (scene == 0)
196 {
197 length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
198 count=ReadBlob(image,length,pixels);
199 if (count != (ssize_t) length)
200 break;
201 }
202 for (y=0; y < (long) image->extract_info.height; y++)
203 {
204 register const PixelPacket
205 *__restrict p;
206
207 register long
208 x;
209
210 register PixelPacket
211 *__restrict q;
212
213 q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,exception);
214 if (q == (PixelPacket *) NULL)
215 break;
216 length=ImportQuantumPixels(canvas_image,(CacheView *) NULL,quantum_info,
217 quantum_type,pixels,exception);
218 if (SyncAuthenticPixels(canvas_image,exception) == MagickFalse)
219 break;
220 count=ReadBlob(image,length,pixels);
221 if (((y-image->extract_info.y) >= 0) &&
222 ((y-image->extract_info.y) < (long) image->rows))
223 {
224 p=GetVirtualPixels(canvas_image,canvas_image->extract_info.x,0,
225 image->columns,1,exception);
226 q=QueueAuthenticPixels(image,0,y-image->extract_info.y,image->columns,
227 1,exception);
228 if ((p == (const PixelPacket *) NULL) || (q == (PixelPacket *) NULL))
229 break;
230 for (x=0; x < (long) image->columns; x++)
231 {
232 q->red=p->red;
233 q->green=p->green;
234 q->blue=p->blue;
235 p++;
236 q++;
237 }
238 if (SyncAuthenticPixels(image,exception) == MagickFalse)
239 break;
240 }
241 if (image->previous == (Image *) NULL)
242 {
243 status=SetImageProgress(image,LoadImageTag,y,image->rows);
244 if (status == MagickFalse)
245 break;
246 }
247 }
248 SetQuantumImageType(image,quantum_type);
cristy94f20072009-09-12 02:12:36 +0000[diff] [blame^]249 if (EOFBlob(image) != MagickFalse)
250 {
251 ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
252 image->filename);
253 break;
254 }
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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);
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 InheritException(exception,&canvas_image->exception);
282 canvas_image=DestroyImage(canvas_image);
283 (void) CloseBlob(image);
284 return(GetFirstImageInList(image));
285}
286
287/*
288%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
289% %
290% %
291% %
292% R e g i s t e r G R A Y I m a g e %
293% %
294% %
295% %
296%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
297%
298% RegisterGRAYImage() adds attributes for the GRAY image format to
299% the list of supported formats. The attributes include the image format
300% tag, a method to read and/or write the format, whether the format
301% supports the saving of more than one frame to the same file or blob,
302% whether the format supports native in-memory I/O, and a brief
303% description of the format.
304%
305% The format of the RegisterGRAYImage method is:
306%
307% unsigned long RegisterGRAYImage(void)
308%
309*/
310ModuleExport unsigned long RegisterGRAYImage(void)
311{
312 MagickInfo
313 *entry;
314
315 entry=SetMagickInfo("GRAY");
316 entry->decoder=(DecodeImageHandler *) ReadGRAYImage;
317 entry->encoder=(EncodeImageHandler *) WriteGRAYImage;
318 entry->raw=MagickTrue;
319 entry->endian_support=MagickTrue;
320 entry->format_type=ExplicitFormatType;
321 entry->description=ConstantString("Raw gray samples");
322 entry->module=ConstantString("GRAY");
323 (void) RegisterMagickInfo(entry);
324 return(MagickImageCoderSignature);
325}
326
327/*
328%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
329% %
330% %
331% %
332% U n r e g i s t e r G R A Y I m a g e %
333% %
334% %
335% %
336%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
337%
338% UnregisterGRAYImage() removes format registrations made by the
339% GRAY module from the list of supported formats.
340%
341% The format of the UnregisterGRAYImage method is:
342%
343% UnregisterGRAYImage(void)
344%
345*/
346ModuleExport void UnregisterGRAYImage(void)
347{
348 (void) UnregisterMagickInfo("GRAY");
349}
350
351/*
352%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
353% %
354% %
355% %
356% W r i t e G R A Y I m a g e %
357% %
358% %
359% %
360%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
361%
362% WriteGRAYImage() writes an image to a file as gray scale intensity
363% values.
364%
365% The format of the WriteGRAYImage method is:
366%
367% MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
368% Image *image)
369%
370% A description of each parameter follows.
371%
372% o image_info: the image info.
373%
374% o image: The image.
375%
376*/
377static MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
378 Image *image)
379{
380 long
381 y;
382
383 MagickBooleanType
384 status;
385
386 MagickOffsetType
387 scene;
388
389 QuantumInfo
390 *quantum_info;
391
392 QuantumType
393 quantum_type;
394
395 ssize_t
396 count;
397
398 size_t
399 length;
400
401 unsigned char
402 *pixels;
403
404 /*
405 Open output image file.
406 */
407 assert(image_info != (const ImageInfo *) NULL);
408 assert(image_info->signature == MagickSignature);
409 assert(image != (Image *) NULL);
410 assert(image->signature == MagickSignature);
411 if (image->debug != MagickFalse)
412 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
413 status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
414 if (status == MagickFalse)
415 return(status);
416 scene=0;
417 do
418 {
419 /*
420 Write grayscale pixels.
421 */
422 if (image->colorspace != RGBColorspace)
423 (void) TransformImageColorspace(image,RGBColorspace);
424 quantum_type=GrayQuantum;
425 quantum_info=AcquireQuantumInfo(image_info,image);
426 if (quantum_info == (QuantumInfo *) NULL)
427 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
428 pixels=GetQuantumPixels(quantum_info);
429 for (y=0; y < (long) image->rows; y++)
430 {
431 register const PixelPacket
432 *__restrict p;
433
434 p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
435 if (p == (const PixelPacket *) NULL)
436 break;
437 length=ExportQuantumPixels(image,(const CacheView *) NULL,quantum_info,
438 quantum_type,pixels,&image->exception);
439 count=WriteBlob(image,length,pixels);
440 if (count != (ssize_t) length)
441 break;
442 if (image->previous == (Image *) NULL)
443 {
444 status=SetImageProgress(image,SaveImageTag,y,image->rows);
445 if (status == MagickFalse)
446 break;
447 }
448 }
449 quantum_info=DestroyQuantumInfo(quantum_info);
450 if (GetNextImageInList(image) == (Image *) NULL)
451 break;
452 image=SyncNextImageInList(image);
453 status=SetImageProgress(image,SaveImagesTag,scene++,
454 GetImageListLength(image));
455 if (status == MagickFalse)
456 break;
457 } while (image_info->adjoin != MagickFalse);
458 (void) CloseBlob(image);
459 return(MagickTrue);
460}