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 1999-2011 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);
 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   p=pixels;
 167   for (y=0; y < (ssize_t) image->rows; y++)
 168   {
 169     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 170     if (q == (Quantum *) NULL)
 171       break;
 172     for (x=0; x < (ssize_t) image->columns; x++)
 173     {
 174       SetPixelRed(image,ScaleCharToQuantum(*p++),q);
 175       SetPixelGreen(image,ScaleCharToQuantum(*p++),q);
 176       SetPixelBlue(image,ScaleCharToQuantum(*p++),q);
 177       SetPixelAlpha(image,ScaleCharToQuantum(*p++),q);
 178       if (GetPixelAlpha(image,q) != OpaqueAlpha)
 179         image->matte=MagickTrue;
 180       q+=GetPixelChannels(image);
 181     }
 182     if (SyncAuthenticPixels(image,exception) == MagickFalse)
 183       break;
 184     status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
 185       image->rows);
 186     if (status == MagickFalse)
 187       break;
 188   }
 189   free(pixels);
 190   pixels=(unsigned char *) NULL;
 191   return(image);
 192 }
 193 #endif
 194 \f
 195 /*
 196 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 197 %                                                                             %
 198 %                                                                             %
 199 %                                                                             %
 200 %   R e g i s t e r W E B P I m a g e                                         %
 201 %                                                                             %
 202 %                                                                             %
 203 %                                                                             %
 204 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 205 %
 206 %  RegisterWEBPImage() adds attributes for the WebP image format to
 207 %  the list of supported formats.  The attributes include the image format
 208 %  tag, a method to read and/or write the format, whether the format
 209 %  supports the saving of more than one frame to the same file or blob,
 210 %  whether the format supports native in-memory I/O, and a brief
 211 %  description of the format.
 212 %
 213 %  The format of the RegisterWEBPImage method is:
 214 %
 215 %      size_t RegisterWEBPImage(void)
 216 %
 217 */
 218 ModuleExport size_t RegisterWEBPImage(void)
 219 {
 220   MagickInfo
 221     *entry;
 222
 223   entry=SetMagickInfo("WEBP");
 224 #if defined(MAGICKCORE_WEBP_DELEGATE)
 225   entry->decoder=(DecodeImageHandler *) ReadWEBPImage;
 226   entry->encoder=(EncodeImageHandler *) WriteWEBPImage;
 227 #endif
 228   entry->description=ConstantString("WebP Image Format");
 229   entry->adjoin=MagickFalse;
 230   entry->module=ConstantString("WEBP");
 231   (void) RegisterMagickInfo(entry);
 232   return(MagickImageCoderSignature);
 233 }
 234 \f
 235 /*
 236 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 237 %                                                                             %
 238 %                                                                             %
 239 %                                                                             %
 240 %   U n r e g i s t e r W E B P I m a g e                                     %
 241 %                                                                             %
 242 %                                                                             %
 243 %                                                                             %
 244 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 245 %
 246 %  UnregisterWEBPImage() removes format registrations made by the WebP module
 247 %  from the list of supported formats.
 248 %
 249 %  The format of the UnregisterWEBPImage method is:
 250 %
 251 %      UnregisterWEBPImage(void)
 252 %
 253 */
 254 ModuleExport void UnregisterWEBPImage(void)
 255 {
 256   (void) UnregisterMagickInfo("WEBP");
 257 }
 258 #if defined(MAGICKCORE_WEBP_DELEGATE)
 259 \f
 260 /*
 261 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 262 %                                                                             %
 263 %                                                                             %
 264 %                                                                             %
 265 %   W r i t e W E B P I m a g e                                               %
 266 %                                                                             %
 267 %                                                                             %
 268 %                                                                             %
 269 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 270 %
 271 %  WriteWEBPImage() writes an image in the WebP image format.
 272 %
 273 %  The format of the WriteWEBPImage method is:
 274 %
 275 %      MagickBooleanType WriteWEBPImage(const ImageInfo *image_info,
 276 %        Image *image)
 277 %
 278 %  A description of each parameter follows.
 279 %
 280 %    o image_info: the image info.
 281 %
 282 %    o image:  The image.
 283 %
 284 */
 285
 286 static int WebPWriter(const unsigned char *stream,size_t length,
 287   const WebPPicture *const picture)
 288 {
 289   Image
 290     *image;
 291
 292   image=(Image *) picture->custom_ptr;
 293   return(length != 0 ? (int) WriteBlob(image,length,stream) : 1);
 294 }
 295
 296 static MagickBooleanType WriteWEBPImage(const ImageInfo *image_info,
 297   Image *image,ExceptionInfo *exception)
 298 {
 299   int
 300     webp_status;
 301
 302   MagickBooleanType
 303     status;
 304
 305   register const Quantum
 306     *restrict p;
 307
 308   register ssize_t
 309     x;
 310
 311   register unsigned char
 312     *restrict q;
 313
 314   ssize_t
 315     y;
 316
 317   unsigned char
 318     *pixels;
 319
 320   WebPConfig
 321     configure;
 322
 323   WebPPicture
 324     picture;
 325
 326   WebPAuxStats
 327     statistics;
 328
 329   /*
 330     Open output image file.
 331   */
 332   assert(image_info != (const ImageInfo *) NULL);
 333   assert(image_info->signature == MagickSignature);
 334   assert(image != (Image *) NULL);
 335   assert(image->signature == MagickSignature);
 336   if (image->debug != MagickFalse)
 337     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 338   status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
 339   if (status == MagickFalse)
 340     return(status);
 341   if (WebPPictureInit(&picture) == 0)
 342     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 343   picture.writer=WebPWriter;
 344   picture.custom_ptr=(void *) image;
 345   picture.stats=(&statistics);
 346   picture.width=(int) image->columns;
 347   picture.height=(int) image->rows;
 348   if (image->quality != UndefinedCompressionQuality)
 349     configure.quality=(float) image->quality;
 350   if (WebPConfigInit(&configure) == 0)
 351     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 352   /*
 353     Future: set custom configuration parameters here.
 354   */
 355   if (WebPValidateConfig(&configure) == 0)
 356     ThrowWriterException(ResourceLimitError,"UnableToEncodeImageFile");
 357   /*
 358     Allocate memory for pixels.
 359   */
 360   pixels=(unsigned char *) AcquireQuantumMemory(image->columns,
 361     (image->matte != MagickFalse ? 4 : 3)*image->rows*sizeof(*pixels));
 362   if (pixels == (unsigned char *) NULL)
 363     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
 364   /*
 365     Convert image to WebP raster pixels.
 366   */
 367   q=pixels;
 368   for (y=0; y < (ssize_t) image->rows; y++)
 369   {
 370     p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
 371     if (p == (const Quantum *) NULL)
 372       break;
 373     for (x=0; x < (ssize_t) image->columns; x++)
 374     {
 375       *q++=ScaleQuantumToChar(GetPixelRed(image,p));
 376       *q++=ScaleQuantumToChar(GetPixelGreen(image,p));
 377       *q++=ScaleQuantumToChar(GetPixelBlue(image,p));
 378       if (image->matte != MagickFalse)
 379         *q++=ScaleQuantumToChar((Quantum) (image->matte != MagickFalse ?
 380           GetPixelAlpha(image,p) : OpaqueAlpha));
 381       p+=GetPixelChannels(image);
 382     }
 383     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
 384       image->rows);
 385     if (status == MagickFalse)
 386       break;
 387   }
 388   if (image->matte == MagickFalse)
 389     webp_status=WebPPictureImportRGB(&picture,pixels,3*picture.width);
 390   else
 391     webp_status=WebPPictureImportRGBA(&picture,pixels,4*picture.width);
 392   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 393   webp_status=WebPEncode(&configure,&picture);
 394   (void) CloseBlob(image);
 395   return(webp_status == 0 ? MagickFalse : MagickTrue);
 396 }
 397 #endif