Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / ImageMagick / ce70c17bb6433add2eb069515a4f3105989e0662 / . / coders / gray.c
blob: bbf5c4edb4b210275a905e19fff3721c8c247595 [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% %
cristy16af1cb2009-12-11 21:38:29 +0000[diff] [blame]20% Copyright 1999-2010 ImageMagick Studio LLC, a non-profit organization %
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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);
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]199 }
200 for (y=0; y < (long) image->extract_info.height; y++)
201 {
202 register const PixelPacket
cristyc47d1f82009-11-26 01:44:43 +0000[diff] [blame]203 *restrict p;
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]204
205 register long
206 x;
207
208 register PixelPacket
cristyc47d1f82009-11-26 01:44:43 +0000[diff] [blame]209 *restrict q;
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]210
cristy93b13ba2009-09-12 04:01:09 +0000[diff] [blame]211 if (count != (ssize_t) length)
212 {
213 ThrowFileException(exception,CorruptImageError,
214 "UnexpectedEndOfFile",image->filename);
215 break;
216 }
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]217 q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,exception);
218 if (q == (PixelPacket *) NULL)
219 break;
220 length=ImportQuantumPixels(canvas_image,(CacheView *) NULL,quantum_info,
221 quantum_type,pixels,exception);
222 if (SyncAuthenticPixels(canvas_image,exception) == MagickFalse)
223 break;
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]224 if (((y-image->extract_info.y) >= 0) &&
225 ((y-image->extract_info.y) < (long) image->rows))
226 {
227 p=GetVirtualPixels(canvas_image,canvas_image->extract_info.x,0,
228 image->columns,1,exception);
229 q=QueueAuthenticPixels(image,0,y-image->extract_info.y,image->columns,
230 1,exception);
231 if ((p == (const PixelPacket *) NULL) || (q == (PixelPacket *) NULL))
232 break;
233 for (x=0; x < (long) image->columns; x++)
234 {
cristyce70c172010-01-07 17:15:30 +0000[diff] [blame^]235 SetRedPixelComponent(q,GetRedPixelComponent(p));
236 SetGreenPixelComponent(q,GetGreenPixelComponent(p));
237 SetBluePixelComponent(q,GetBluePixelComponent(p));
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]238 p++;
239 q++;
240 }
241 if (SyncAuthenticPixels(image,exception) == MagickFalse)
242 break;
243 }
244 if (image->previous == (Image *) NULL)
245 {
246 status=SetImageProgress(image,LoadImageTag,y,image->rows);
247 if (status == MagickFalse)
248 break;
249 }
cristy93b13ba2009-09-12 04:01:09 +0000[diff] [blame]250 count=ReadBlob(image,length,pixels);
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]251 }
252 SetQuantumImageType(image,quantum_type);
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]253 /*
254 Proceed to next image.
255 */
256 if (image_info->number_scenes != 0)
257 if (image->scene >= (image_info->scene+image_info->number_scenes-1))
258 break;
259 if (count == (ssize_t) length)
260 {
261 /*
262 Allocate next image structure.
263 */
264 AcquireNextImage(image_info,image);
265 if (GetNextImageInList(image) == (Image *) NULL)
266 {
267 image=DestroyImageList(image);
268 return((Image *) NULL);
269 }
270 image=SyncNextImageInList(image);
271 status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
272 GetBlobSize(image));
273 if (status == MagickFalse)
274 break;
275 }
276 scene++;
277 } while (count == (ssize_t) length);
278 quantum_info=DestroyQuantumInfo(quantum_info);
cristy01a3f332009-10-27 14:17:37 +0000[diff] [blame]279 InheritException(&image->exception,&canvas_image->exception);
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]280 canvas_image=DestroyImage(canvas_image);
281 (void) CloseBlob(image);
282 return(GetFirstImageInList(image));
283}
284
285/*
286%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
287% %
288% %
289% %
290% R e g i s t e r G R A Y I m a g e %
291% %
292% %
293% %
294%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
295%
296% RegisterGRAYImage() adds attributes for the GRAY image format to
297% the list of supported formats. The attributes include the image format
298% tag, a method to read and/or write the format, whether the format
299% supports the saving of more than one frame to the same file or blob,
300% whether the format supports native in-memory I/O, and a brief
301% description of the format.
302%
303% The format of the RegisterGRAYImage method is:
304%
305% unsigned long RegisterGRAYImage(void)
306%
307*/
308ModuleExport unsigned long RegisterGRAYImage(void)
309{
310 MagickInfo
311 *entry;
312
313 entry=SetMagickInfo("GRAY");
314 entry->decoder=(DecodeImageHandler *) ReadGRAYImage;
315 entry->encoder=(EncodeImageHandler *) WriteGRAYImage;
316 entry->raw=MagickTrue;
317 entry->endian_support=MagickTrue;
318 entry->format_type=ExplicitFormatType;
319 entry->description=ConstantString("Raw gray samples");
320 entry->module=ConstantString("GRAY");
321 (void) RegisterMagickInfo(entry);
322 return(MagickImageCoderSignature);
323}
324
325/*
326%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
327% %
328% %
329% %
330% U n r e g i s t e r G R A Y I m a g e %
331% %
332% %
333% %
334%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
335%
336% UnregisterGRAYImage() removes format registrations made by the
337% GRAY module from the list of supported formats.
338%
339% The format of the UnregisterGRAYImage method is:
340%
341% UnregisterGRAYImage(void)
342%
343*/
344ModuleExport void UnregisterGRAYImage(void)
345{
346 (void) UnregisterMagickInfo("GRAY");
347}
348
349/*
350%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
351% %
352% %
353% %
354% W r i t e G R A Y I m a g e %
355% %
356% %
357% %
358%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
359%
360% WriteGRAYImage() writes an image to a file as gray scale intensity
361% values.
362%
363% The format of the WriteGRAYImage method is:
364%
365% MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
366% Image *image)
367%
368% A description of each parameter follows.
369%
370% o image_info: the image info.
371%
372% o image: The image.
373%
374*/
375static MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
376 Image *image)
377{
378 long
379 y;
380
381 MagickBooleanType
382 status;
383
384 MagickOffsetType
385 scene;
386
387 QuantumInfo
388 *quantum_info;
389
390 QuantumType
391 quantum_type;
392
393 ssize_t
394 count;
395
396 size_t
397 length;
398
399 unsigned char
400 *pixels;
401
402 /*
403 Open output image file.
404 */
405 assert(image_info != (const ImageInfo *) NULL);
406 assert(image_info->signature == MagickSignature);
407 assert(image != (Image *) NULL);
408 assert(image->signature == MagickSignature);
409 if (image->debug != MagickFalse)
410 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
411 status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
412 if (status == MagickFalse)
413 return(status);
414 scene=0;
415 do
416 {
417 /*
418 Write grayscale pixels.
419 */
420 if (image->colorspace != RGBColorspace)
421 (void) TransformImageColorspace(image,RGBColorspace);
422 quantum_type=GrayQuantum;
423 quantum_info=AcquireQuantumInfo(image_info,image);
424 if (quantum_info == (QuantumInfo *) NULL)
425 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
426 pixels=GetQuantumPixels(quantum_info);
427 for (y=0; y < (long) image->rows; y++)
428 {
429 register const PixelPacket
cristyc47d1f82009-11-26 01:44:43 +0000[diff] [blame]430 *restrict p;
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]431
432 p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
433 if (p == (const PixelPacket *) NULL)
434 break;
435 length=ExportQuantumPixels(image,(const CacheView *) NULL,quantum_info,
436 quantum_type,pixels,&image->exception);
437 count=WriteBlob(image,length,pixels);
438 if (count != (ssize_t) length)
439 break;
440 if (image->previous == (Image *) NULL)
441 {
442 status=SetImageProgress(image,SaveImageTag,y,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}