2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6 % W W EEEEE BBBB PPPP %
8 % W W W EEE BBBB PPPP %
13 % Read/Write WebP 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/blob.h"
44 #include "MagickCore/blob-private.h"
45 #include "MagickCore/client.h"
46 #include "MagickCore/display.h"
47 #include "MagickCore/exception.h"
48 #include "MagickCore/exception-private.h"
49 #include "MagickCore/image.h"
50 #include "MagickCore/image-private.h"
51 #include "MagickCore/list.h"
52 #include "MagickCore/magick.h"
53 #include "MagickCore/monitor.h"
54 #include "MagickCore/monitor-private.h"
55 #include "MagickCore/memory_.h"
56 #include "MagickCore/option.h"
57 #include "MagickCore/pixel-accessor.h"
58 #include "MagickCore/quantum-private.h"
59 #include "MagickCore/static.h"
60 #include "MagickCore/string_.h"
61 #include "MagickCore/module.h"
62 #include "MagickCore/utility.h"
63 #include "MagickCore/xwindow.h"
64 #include "MagickCore/xwindow-private.h"
65 #if defined(MAGICKCORE_WEBP_DELEGATE)
66 #include <webp/decode.h>
67 #include <webp/encode.h>
73 #if defined(MAGICKCORE_WEBP_DELEGATE)
74 static MagickBooleanType
75 WriteWEBPImage(const ImageInfo *,Image *,ExceptionInfo *);
78 #if defined(MAGICKCORE_WEBP_DELEGATE)
80 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
84 % R e a d W E B P I m a g e %
88 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
90 % ReadWEBPImage() reads an image in the WebP image format.
92 % The format of the ReadWEBPImage method is:
94 % Image *ReadWEBPImage(const ImageInfo *image_info,
95 % ExceptionInfo *exception)
97 % A description of each parameter follows:
99 % o image_info: the image info.
101 % o exception: return any errors or warnings in this structure.
104 static Image *ReadWEBPImage(const ImageInfo *image_info,
105 ExceptionInfo *exception)
123 register unsigned char
140 assert(image_info != (const ImageInfo *) NULL);
141 assert(image_info->signature == MagickSignature);
142 if (image_info->debug != MagickFalse)
143 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
144 image_info->filename);
145 assert(exception != (ExceptionInfo *) NULL);
146 assert(exception->signature == MagickSignature);
147 image=AcquireImage(image_info,exception);
148 status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
149 if (status == MagickFalse)
151 image=DestroyImageList(image);
152 return((Image *) NULL);
154 length=(size_t) GetBlobSize(image);
155 stream=(unsigned char *) AcquireQuantumMemory(length,sizeof(*stream));
156 if (stream == (unsigned char *) NULL)
157 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
158 count=ReadBlob(image,length,stream);
159 if (count != (ssize_t) length)
160 ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
161 pixels=(unsigned char *) WebPDecodeRGBA(stream,length,&width,&height);
162 if (pixels == (unsigned char *) NULL)
163 ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
164 image->columns=(size_t) width;
165 image->rows=(size_t) height;
166 image->matte=MagickTrue;
168 for (y=0; y < (ssize_t) image->rows; y++)
170 q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
171 if (q == (Quantum *) NULL)
173 for (x=0; x < (ssize_t) image->columns; x++)
175 SetPixelRed(image,ScaleCharToQuantum(*p++),q);
176 SetPixelGreen(image,ScaleCharToQuantum(*p++),q);
177 SetPixelBlue(image,ScaleCharToQuantum(*p++),q);
178 SetPixelAlpha(image,ScaleCharToQuantum(*p++),q);
179 q+=GetPixelChannels(image);
181 if (SyncAuthenticPixels(image,exception) == MagickFalse)
183 status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
185 if (status == MagickFalse)
189 pixels=(unsigned char *) NULL;
195 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
199 % R e g i s t e r W E B P I m a g e %
203 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
205 % RegisterWEBPImage() adds attributes for the WebP image format to
206 % the list of supported formats. The attributes include the image format
207 % tag, a method to read and/or write the format, whether the format
208 % supports the saving of more than one frame to the same file or blob,
209 % whether the format supports native in-memory I/O, and a brief
210 % description of the format.
212 % The format of the RegisterWEBPImage method is:
214 % size_t RegisterWEBPImage(void)
217 ModuleExport size_t RegisterWEBPImage(void)
222 entry=SetMagickInfo("WEBP");
223 #if defined(MAGICKCORE_WEBP_DELEGATE)
224 entry->decoder=(DecodeImageHandler *) ReadWEBPImage;
225 entry->encoder=(EncodeImageHandler *) WriteWEBPImage;
227 entry->description=ConstantString("WebP Image Format");
228 entry->adjoin=MagickFalse;
229 entry->module=ConstantString("WEBP");
230 (void) RegisterMagickInfo(entry);
231 return(MagickImageCoderSignature);
235 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
239 % U n r e g i s t e r W E B P I m a g e %
243 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
245 % UnregisterWEBPImage() removes format registrations made by the WebP module
246 % from the list of supported formats.
248 % The format of the UnregisterWEBPImage method is:
250 % UnregisterWEBPImage(void)
253 ModuleExport void UnregisterWEBPImage(void)
255 (void) UnregisterMagickInfo("WEBP");
257 #if defined(MAGICKCORE_WEBP_DELEGATE)
260 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
264 % W r i t e W E B P I m a g e %
268 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
270 % WriteWEBPImage() writes an image in the WebP image format.
272 % The format of the WriteWEBPImage method is:
274 % MagickBooleanType WriteWEBPImage(const ImageInfo *image_info,
277 % A description of each parameter follows.
279 % o image_info: the image info.
281 % o image: The image.
285 static int WebPWriter(const unsigned char *stream,size_t length,
286 const WebPPicture *const picture)
291 image=(Image *) picture->custom_ptr;
292 return(length != 0 ? (int) WriteBlob(image,length,stream) : 1);
295 static MagickBooleanType WriteWEBPImage(const ImageInfo *image_info,
296 Image *image,ExceptionInfo *exception)
304 register const Quantum
310 register unsigned char
329 Open output image file.
331 assert(image_info != (const ImageInfo *) NULL);
332 assert(image_info->signature == MagickSignature);
333 assert(image != (Image *) NULL);
334 assert(image->signature == MagickSignature);
335 if (image->debug != MagickFalse)
336 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
337 status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
338 if (status == MagickFalse)
340 if (WebPPictureInit(&picture) == 0)
341 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
342 picture.writer=WebPWriter;
343 picture.custom_ptr=(void *) image;
344 picture.stats=(&statistics);
345 picture.width=(int) image->columns;
346 picture.height=(int) image->rows;
347 if (image->quality != UndefinedCompressionQuality)
348 configure.quality=(float) image->quality;
349 if (WebPConfigInit(&configure) == 0)
350 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
352 Future: set custom configuration parameters here.
354 if (WebPValidateConfig(&configure) == 0)
355 ThrowWriterException(ResourceLimitError,"UnableToEncodeImageFile");
357 Allocate memory for pixels.
359 pixels=(unsigned char *) AcquireQuantumMemory(image->columns,4*image->rows*
361 if (pixels == (unsigned char *) NULL)
362 ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
364 Convert image to WebP raster pixels.
367 for (y=0; y < (ssize_t) image->rows; y++)
369 p=GetVirtualPixels(image,0,y,image->columns,1,exception);
370 if (p == (const Quantum *) NULL)
372 for (x=0; x < (ssize_t) image->columns; x++)
374 *q++=ScaleQuantumToChar(GetPixelRed(image,p));
375 *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
376 *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
377 if (image->matte != MagickFalse)
378 *q++=ScaleQuantumToChar(GetPixelAlpha(image,p));
379 p+=GetPixelChannels(image);
381 status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
383 if (status == MagickFalse)
386 if (image->matte == MagickFalse)
387 webp_status=WebPPictureImportRGB(&picture,pixels,3*picture.width);
389 webp_status=WebPPictureImportRGBA(&picture,pixels,4*picture.width);
390 pixels=(unsigned char *) RelinquishMagickMemory(pixels);
391 webp_status=WebPEncode(&configure,&picture);
392 (void) CloseBlob(image);
393 return(webp_status == 0 ? MagickFalse : MagickTrue);