2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
13 % Read/Write RAW Gray Image Format %
20 % Copyright 1999-2012 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/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"
70 static MagickBooleanType
71 WriteGRAYImage(const ImageInfo *,Image *,ExceptionInfo *);
74 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
78 % R e a d G R A Y I m a g e %
82 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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.
88 % The format of the ReadGRAYImage method is:
90 % Image *ReadGRAYImage(const ImageInfo *image_info,
91 % 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 *ReadGRAYImage(const ImageInfo *image_info,
101 ExceptionInfo *exception)
132 assert(image_info != (const ImageInfo *) NULL);
133 assert(image_info->signature == MagickSignature);
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 == MagickSignature);
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)
145 image=DestroyImageList(image);
146 return((Image *) NULL);
148 if (DiscardBlobBytes(image,(size_t) image->offset) == MagickFalse)
149 ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
152 Create virtual canvas to support cropping (i.e. image.gray[100x100+10+20]).
154 SetImageColorspace(image,GRAYColorspace,exception);
155 canvas_image=CloneImage(image,image->extract_info.width,1,MagickFalse,
157 (void) SetImageVirtualPixelMethod(canvas_image,BlackVirtualPixelMethod,
159 quantum_type=GrayQuantum;
160 quantum_info=AcquireQuantumInfo(image_info,canvas_image);
161 if (quantum_info == (QuantumInfo *) NULL)
162 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
163 pixels=GetQuantumPixels(quantum_info);
164 if (image_info->number_scenes != 0)
165 while (image->scene < image_info->scene)
171 length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
172 for (y=0; y < (ssize_t) image->rows; y++)
174 count=ReadBlob(image,length,pixels);
175 if (count != (ssize_t) length)
185 Read pixels to virtual canvas image then push to image.
187 if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
188 if (image->scene >= (image_info->scene+image_info->number_scenes-1))
192 length=GetQuantumExtent(canvas_image,quantum_info,quantum_type);
193 count=ReadBlob(image,length,pixels);
195 for (y=0; y < (ssize_t) image->extract_info.height; y++)
197 register const Quantum
206 if (count != (ssize_t) length)
208 ThrowFileException(exception,CorruptImageError,
209 "UnexpectedEndOfFile",image->filename);
212 q=GetAuthenticPixels(canvas_image,0,0,canvas_image->columns,1,exception);
213 if (q == (Quantum *) NULL)
215 length=ImportQuantumPixels(canvas_image,(CacheView *) NULL,quantum_info,
216 quantum_type,pixels,exception);
217 if (SyncAuthenticPixels(canvas_image,exception) == MagickFalse)
219 if (((y-image->extract_info.y) >= 0) &&
220 ((y-image->extract_info.y) < (ssize_t) image->rows))
222 p=GetVirtualPixels(canvas_image,canvas_image->extract_info.x,0,
223 image->columns,1,exception);
224 q=QueueAuthenticPixels(image,0,y-image->extract_info.y,image->columns,
226 if ((p == (const Quantum *) NULL) ||
227 (q == (Quantum *) NULL))
229 for (x=0; x < (ssize_t) image->columns; x++)
231 SetPixelGray(image,GetPixelGray(canvas_image,p),q);
232 p+=GetPixelChannels(canvas_image);
233 q+=GetPixelChannels(image);
235 if (SyncAuthenticPixels(image,exception) == MagickFalse)
238 if (image->previous == (Image *) NULL)
240 status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
242 if (status == MagickFalse)
245 count=ReadBlob(image,length,pixels);
247 SetQuantumImageType(image,quantum_type);
249 Proceed to next image.
251 if (image_info->number_scenes != 0)
252 if (image->scene >= (image_info->scene+image_info->number_scenes-1))
254 if (count == (ssize_t) length)
257 Allocate next image structure.
259 AcquireNextImage(image_info,image,exception);
260 if (GetNextImageInList(image) == (Image *) NULL)
262 image=DestroyImageList(image);
263 return((Image *) NULL);
265 image=SyncNextImageInList(image);
266 status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
268 if (status == MagickFalse)
272 } while (count == (ssize_t) length);
273 quantum_info=DestroyQuantumInfo(quantum_info);
274 canvas_image=DestroyImage(canvas_image);
275 (void) CloseBlob(image);
276 return(GetFirstImageInList(image));
280 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
284 % R e g i s t e r G R A Y I m a g e %
288 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
290 % RegisterGRAYImage() adds attributes for the GRAY image format to
291 % the list of supported formats. The attributes include the image format
292 % tag, a method to read and/or write the format, whether the format
293 % supports the saving of more than one frame to the same file or blob,
294 % whether the format supports native in-memory I/O, and a brief
295 % description of the format.
297 % The format of the RegisterGRAYImage method is:
299 % size_t RegisterGRAYImage(void)
302 ModuleExport size_t RegisterGRAYImage(void)
307 entry=SetMagickInfo("GRAY");
308 entry->decoder=(DecodeImageHandler *) ReadGRAYImage;
309 entry->encoder=(EncodeImageHandler *) WriteGRAYImage;
310 entry->raw=MagickTrue;
311 entry->endian_support=MagickTrue;
312 entry->description=ConstantString("Raw gray samples");
313 entry->module=ConstantString("GRAY");
314 (void) RegisterMagickInfo(entry);
315 return(MagickImageCoderSignature);
319 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
323 % U n r e g i s t e r G R A Y I m a g e %
327 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
329 % UnregisterGRAYImage() removes format registrations made by the
330 % GRAY module from the list of supported formats.
332 % The format of the UnregisterGRAYImage method is:
334 % UnregisterGRAYImage(void)
337 ModuleExport void UnregisterGRAYImage(void)
339 (void) UnregisterMagickInfo("GRAY");
343 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
347 % W r i t e G R A Y I m a g e %
351 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
353 % WriteGRAYImage() writes an image to a file as gray scale intensity
356 % The format of the WriteGRAYImage method is:
358 % MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
359 % Image *image,ExceptionInfo *exception)
361 % A description of each parameter follows.
363 % o image_info: the image info.
365 % o image: The image.
367 % o exception: return any errors or warnings in this structure.
370 static MagickBooleanType WriteGRAYImage(const ImageInfo *image_info,
371 Image *image,ExceptionInfo *exception)
396 Open output image file.
398 assert(image_info != (const ImageInfo *) NULL);
399 assert(image_info->signature == MagickSignature);
400 assert(image != (Image *) NULL);
401 assert(image->signature == MagickSignature);
402 if (image->debug != MagickFalse)
403 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
404 assert(exception != (ExceptionInfo *) NULL);
405 assert(exception->signature == MagickSignature);
406 status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
407 if (status == MagickFalse)
413 Write grayscale pixels.
415 if ((IssRGBColorspace(image->colorspace) == MagickFalse) &&
416 (IsImageGray(image,exception) == MagickFalse))
417 (void) TransformImageColorspace(image,sRGBColorspace,exception);
418 quantum_type=GrayQuantum;
419 quantum_info=AcquireQuantumInfo(image_info,image);
420 if (quantum_info == (QuantumInfo *) NULL)
421 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
422 pixels=GetQuantumPixels(quantum_info);
423 for (y=0; y < (ssize_t) image->rows; y++)
425 register const Quantum
428 p=GetVirtualPixels(image,0,y,image->columns,1,exception);
429 if (p == (const Quantum *) NULL)
431 length=ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
432 quantum_type,pixels,exception);
433 count=WriteBlob(image,length,pixels);
434 if (count != (ssize_t) length)
436 if (image->previous == (Image *) NULL)
438 status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
440 if (status == MagickFalse)
444 quantum_info=DestroyQuantumInfo(quantum_info);
445 if (GetNextImageInList(image) == (Image *) NULL)
447 image=SyncNextImageInList(image);
448 status=SetImageProgress(image,SaveImagesTag,scene++,
449 GetImageListLength(image));
450 if (status == MagickFalse)
452 } while (image_info->adjoin != MagickFalse);
453 (void) CloseBlob(image);