granicus.if.org Git - imagemagick/blob - coders/webp.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                         W   W  EEEEE  BBBB   PPPP                           %
   7 %                         W   W  E      B   B  P   P                          %
   8 %                         W W W  EEE    BBBB   PPPP                           %
   9 %                         WW WW  E      B   B  P                              %
  10 %                         W   W  EEEEE  BBBB   P                              %
  11 %                                                                             %
  12 %                                                                             %
  13 %                         Read/Write WebP Image Format                        %
  14 %                                                                             %
  15 %                              Software Design                                %
  16 %                                John Cristy                                  %
  17 %                                 March 2011                                  %
  18 %                                                                             %
  19 %                                                                             %
  20 %  Copyright 1999-2013 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 \f
  39 /*
  40   Include declarations.
  41 */
  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>
  68 #endif
  69 \f
  70 /*
  71   Forward declarations.
  72 */
  73 #if defined(MAGICKCORE_WEBP_DELEGATE)
  74 static MagickBooleanType
  75   WriteWEBPImage(const ImageInfo *,Image *,ExceptionInfo *);
  76 #endif
  77 \f
  78 #if defined(MAGICKCORE_WEBP_DELEGATE)
  79 /*
  80 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  81 %                                                                             %
  82 %                                                                             %
  83 %                                                                             %
  84 %   R e a d W E B P I m a g e                                                 %
  85 %                                                                             %
  86 %                                                                             %
  87 %                                                                             %
  88 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  89 %
  90 %  ReadWEBPImage() reads an image in the WebP image format.
  91 %
  92 %  The format of the ReadWEBPImage method is:
  93 %
  94 %      Image *ReadWEBPImage(const ImageInfo *image_info,
  95 %        ExceptionInfo *exception)
  96 %
  97 %  A description of each parameter follows:
  98 %
  99 %    o image_info: the image info.
 100 %
 101 %    o exception: return any errors or warnings in this structure.
 102 %
 103 */
 104 static Image *ReadWEBPImage(const ImageInfo *image_info,
 105   ExceptionInfo *exception)
 106 {
 107   int
 108     height,
 109     width;
 110
 111   Image
 112     *image;
 113
 114   MagickBooleanType
 115     status;
 116
 117   register Quantum
 118     *q;
 119
 120   register ssize_t
 121     x;
 122
 123   register unsigned char
 124     *p;
 125
 126   size_t
 127     length;
 128
 129   ssize_t
 130     count,
 131     y;
 132
 133   unsigned char
 134     *stream,
 135     *pixels;
 136
 137   /*
 138     Open image file.
 139   */
 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)
 150     {
 151       image=DestroyImageList(image);
 152       return((Image *) NULL);
 153     }
 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->alpha_trait=BlendPixelTrait;
 167   p=pixels;
 168   for (y=0; y < (ssize_t) image->rows; y++)
 169   {
 170     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 171     if (q == (Quantum *) NULL)
 172       break;
 173     for (x=0; x < (ssize_t) image->columns; x++)
 174     {
 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);
 180     }
 181     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 182       break;
 183     status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 184       image->rows);
 185     if (status == MagickFalse)
 186       break;
 187   }
 188   free(pixels);
 189   pixels=(unsigned char *) NULL;
 190   return(image);
 191 }
 192 #endif
 193 \f
 194 /*
 195 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 196 %                                                                             %
 197 %                                                                             %
 198 %                                                                             %
 199 %   R e g i s t e r W E B P I m a g e                                         %
 200 %                                                                             %
 201 %                                                                             %
 202 %                                                                             %
 203 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 204 %
 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.
 211 %
 212 %  The format of the RegisterWEBPImage method is:
 213 %
 214 %      size_t RegisterWEBPImage(void)
 215 %
 216 */
 217 ModuleExport size_t RegisterWEBPImage(void)
 218 {
 219   MagickInfo
 220     *entry;
 221
 222   entry=SetMagickInfo("WEBP");
 223 #if defined(MAGICKCORE_WEBP_DELEGATE)
 224   entry->decoder=(DecodeImageHandler *) ReadWEBPImage;
 225   entry->encoder=(EncodeImageHandler *) WriteWEBPImage;
 226 #endif
 227   entry->description=ConstantString("WebP Image Format");
 228   entry->adjoin=MagickFalse;
 229   entry->module=ConstantString("WEBP");
 230   (void) RegisterMagickInfo(entry);
 231   return(MagickImageCoderSignature);
 232 }
 233 \f
 234 /*
 235 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 236 %                                                                             %
 237 %                                                                             %
 238 %                                                                             %
 239 %   U n r e g i s t e r W E B P I m a g e                                     %
 240 %                                                                             %
 241 %                                                                             %
 242 %                                                                             %
 243 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 244 %
 245 %  UnregisterWEBPImage() removes format registrations made by the WebP module
 246 %  from the list of supported formats.
 247 %
 248 %  The format of the UnregisterWEBPImage method is:
 249 %
 250 %      UnregisterWEBPImage(void)
 251 %
 252 */
 253 ModuleExport void UnregisterWEBPImage(void)
 254 {
 255   (void) UnregisterMagickInfo("WEBP");
 256 }
 257 #if defined(MAGICKCORE_WEBP_DELEGATE)
 258 \f
 259 /*
 260 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 261 %                                                                             %
 262 %                                                                             %
 263 %                                                                             %
 264 %   W r i t e W E B P I m a g e                                               %
 265 %                                                                             %
 266 %                                                                             %
 267 %                                                                             %
 268 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 269 %
 270 %  WriteWEBPImage() writes an image in the WebP image format.
 271 %
 272 %  The format of the WriteWEBPImage method is:
 273 %
 274 %      MagickBooleanType WriteWEBPImage(const ImageInfo *image_info,
 275 %        Image *image)
 276 %
 277 %  A description of each parameter follows.
 278 %
 279 %    o image_info: the image info.
 280 %
 281 %    o image:  The image.
 282 %
 283 */
 284
 285 static int WebPWriter(const unsigned char *stream,size_t length,
 286   const WebPPicture *const picture)
 287 {
 288   Image
 289     *image;
 290
 291   image=(Image *) picture->custom_ptr;
 292   return(length != 0 ? (int) WriteBlob(image,length,stream) : 1);
 293 }
 294
 295 static MagickBooleanType WriteWEBPImage(const ImageInfo *image_info,
 296   Image *image,ExceptionInfo *exception)
 297 {
 298   int
 299     webp_status;
 300
 301   MagickBooleanType
 302     status;
 303
 304   register const Quantum
 305     *restrict p;
 306
 307   register ssize_t
 308     x;
 309
 310   register unsigned char
 311     *restrict q;
 312
 313   ssize_t
 314     y;
 315
 316   unsigned char
 317     *pixels;
 318
 319   WebPConfig
 320     configure;
 321
 322   WebPPicture
 323     picture;
 324
 325   WebPAuxStats
 326     statistics;
 327
 328   /*
 329     Open output image file.
 330   */
 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   if ((image->columns > 16383) || (image->rows > 16383))
 338     ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
 339   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
 340   if (status == MagickFalse)
 341     return(status);
 342   if (WebPPictureInit(&picture) == 0)
 343     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 344   picture.writer=WebPWriter;
 345   picture.custom_ptr=(void *) image;
 346   picture.stats=(&statistics);
 347   picture.width=(int) image->columns;
 348   picture.height=(int) image->rows;
 349   if (WebPConfigInit(&configure) == 0)
 350     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 351   if (image->quality != UndefinedCompressionQuality)
 352     configure.quality=(float) image->quality;
 353   if (WebPValidateConfig(&configure) == 0)
 354     ThrowWriterException(ResourceLimitError,"UnableToEncodeImageFile");
 355   /*
 356     Allocate memory for pixels.
 357   */
 358   pixels=(unsigned char *) AcquireQuantumMemory(image->columns,4*image->rows*
 359     sizeof(*pixels));
 360   if (pixels == (unsigned char *) NULL)
 361     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 362   /*
 363     Convert image to WebP raster pixels.
 364   */
 365   q=pixels;
 366   for (y=0; y < (ssize_t) image->rows; y++)
 367   {
 368     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
 369     if (p == (const Quantum *) NULL)
 370       break;
 371     for (x=0; x < (ssize_t) image->columns; x++)
 372     {
 373       *q++=ScaleQuantumToChar(GetPixelRed(image,p));
 374       *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
 375       *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
 376       if (image->alpha_trait == BlendPixelTrait)
 377         *q++=ScaleQuantumToChar(GetPixelAlpha(image,p));
 378       p+=GetPixelChannels(image);
 379     }
 380     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 381       image->rows);
 382     if (status == MagickFalse)
 383       break;
 384   }
 385   if (image->alpha_trait != BlendPixelTrait)
 386     webp_status=WebPPictureImportRGB(&picture,pixels,3*picture.width);
 387   else
 388     webp_status=WebPPictureImportRGBA(&picture,pixels,4*picture.width);
 389   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 390   webp_status=WebPEncode(&configure,&picture);
 391   WebPPictureFree(&picture);
 392   (void) CloseBlob(image);
 393   return(webp_status == 0 ? MagickFalse : MagickTrue);
 394 }
 395 #endif