/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- IsWEBP
- ReadWebPLSBWord
- IsWEBPImageLossless
- ReadWEBPImage
- RegisterWEBPImage
- UnregisterWEBPImage
- WebPWriter
- WriteWEBPImage
/*
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% %
% %
% %
% W W EEEEE BBBB PPPP %
% W W E B B P P %
% W W W EEE BBBB PPPP %
% WW WW E B B P %
% W W EEEEE BBBB P %
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% Read/Write WebP Image Format %
% %
% Software Design %
% John Cristy %
% March 2011 %
% %
% %
% Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% http://www.imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/artifact.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/client.h"
#include "magick/colorspace-private.h"
#include "magick/display.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/monitor.h"
#include "magick/monitor-private.h"
#include "magick/memory_.h"
#include "magick/option.h"
#include "magick/pixel-accessor.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/string-private.h"
#include "magick/module.h"
#include "magick/utility.h"
#include "magick/xwindow.h"
#include "magick/xwindow-private.h"
#if defined(MAGICKCORE_WEBP_DELEGATE)
#include <webp/decode.h>
#include <webp/encode.h>
#endif
/*
Forward declarations.
*/
#if defined(MAGICKCORE_WEBP_DELEGATE)
static MagickBooleanType
WriteWEBPImage(const ImageInfo *,Image *);
#endif
/*
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% I s W E B P %
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%
% IsWEBP() returns MagickTrue if the image format type, identified by the
% magick string, is WebP.
%
% The format of the IsWEBP method is:
%
% MagickBooleanType IsWEBP(const unsigned char *magick,const size_t length)
%
% A description of each parameter follows:
%
% o magick: compare image format pattern against these bytes.
%
% o length: Specifies the length of the magick string.
%
*/
static MagickBooleanType IsWEBP(const unsigned char *magick,const size_t length)
{
if (length < 12)
return(MagickFalse);
if (LocaleNCompare((const char *) magick+8,"WEBP",4) == 0)
return(MagickTrue);
return(MagickFalse);
}
#if defined(MAGICKCORE_WEBP_DELEGATE)
/*
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% R e a d W E B P I m a g e %
% %
% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ReadWEBPImage() reads an image in the WebP image format.
%
% The format of the ReadWEBPImage method is:
%
% Image *ReadWEBPImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image_info: the image info.
%
% o exception: return any errors or warnings in this structure.
%
*/
static inline uint32_t ReadWebPLSBWord(const unsigned char *restrict data)
{
register const unsigned char
*p;
register uint32_t
value;
p=data;
value=(uint32_t) (*p++);
value|=((uint32_t) (*p++)) << 8;
value|=((uint32_t) (*p++)) << 16;
value|=((uint32_t) (*p++)) << 24;
return(value);
}
static MagickBooleanType IsWEBPImageLossless(const unsigned char *stream,
const size_t length)
{
#define VP8_CHUNK_INDEX 15
#define LOSSLESS_FLAG 'L'
#define EXTENDED_HEADER 'X'
#define VP8_CHUNK_HEADER "VP8"
#define VP8_CHUNK_HEADER_SIZE 3
#define RIFF_HEADER_SIZE 12
#define VP8X_CHUNK_SIZE 10
#define TAG_SIZE 4
#define CHUNK_SIZE_BYTES 4
#define CHUNK_HEADER_SIZE 8
#define MAX_CHUNK_PAYLOAD (~0U-CHUNK_HEADER_SIZE-1)
ssize_t
offset;
/*
Read simple header.
*/
if (stream[VP8_CHUNK_INDEX] != EXTENDED_HEADER)
return(stream[VP8_CHUNK_INDEX] == LOSSLESS_FLAG ? MagickTrue : MagickFalse);
/*
Read extended header.
*/
offset=RIFF_HEADER_SIZE+TAG_SIZE+CHUNK_SIZE_BYTES+VP8X_CHUNK_SIZE;
while (offset <= (ssize_t) length)
{
uint32_t
chunk_size,
chunk_size_pad;
chunk_size=ReadWebPLSBWord(stream+offset+TAG_SIZE);
if (chunk_size > MAX_CHUNK_PAYLOAD)
break;
chunk_size_pad=(CHUNK_HEADER_SIZE+chunk_size+1) & ~1;
if (memcmp(stream+offset,VP8_CHUNK_HEADER,VP8_CHUNK_HEADER_SIZE) == 0)
return(*(stream+offset+VP8_CHUNK_HEADER_SIZE) == LOSSLESS_FLAG ?
MagickTrue : MagickFalse);
offset+=chunk_size_pad;
}
return(MagickFalse);
}
static Image *ReadWEBPImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
Image
*image;
MagickBooleanType
status;
register unsigned char
*p;
size_t
length;
ssize_t
count,
y;
unsigned char
*stream;
WebPDecoderConfig
configure;
WebPDecBuffer
*restrict webp_image = &configure.output;
WebPBitstreamFeatures
*restrict features = &configure.input;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AcquireImage(image_info);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFalse)
{
image=DestroyImageList(image);
return((Image *) NULL);
}
if (WebPInitDecoderConfig(&configure) == 0)
ThrowReaderException(ResourceLimitError,"UnableToDecodeImageFile");
length=(size_t) GetBlobSize(image);
stream=(unsigned char *) AcquireQuantumMemory(length,sizeof(*stream));
if (stream == (unsigned char *) NULL)
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
count=ReadBlob(image,length,stream);
if (count != (ssize_t) length)
ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
if (WebPGetFeatures(stream,length,features) != 0)
{
stream=(unsigned char*) RelinquishMagickMemory(stream);
ThrowReaderException(ResourceLimitError,"UnableToDecodeImageFile");
}
webp_image->colorspace=MODE_RGBA;
if (WebPDecode(stream,length,&configure) != 0)
{
stream=(unsigned char*) RelinquishMagickMemory(stream);
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
}
image->columns=(size_t) webp_image->width;
image->rows=(size_t) webp_image->height;
image->matte=features->has_alpha != 0 ? MagickTrue : MagickFalse;
if (IsWEBPImageLossless(stream,length) != MagickFalse)
image->quality=100;
p=webp_image->u.RGBA.rgba;
for (y=0; y < (ssize_t) image->rows; y++)
{
register PixelPacket
*q;
register ssize_t
x;
q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
if (q == (PixelPacket *) NULL)
break;
for (x=0; x < (ssize_t) image->columns; x++)
{
SetPixelRed(q,ScaleCharToQuantum(*p++));
SetPixelGreen(q,ScaleCharToQuantum(*p++));
SetPixelBlue(q,ScaleCharToQuantum(*p++));
SetPixelAlpha(q,ScaleCharToQuantum(*p++));
q++;
}
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
WebPFreeDecBuffer(webp_image);
stream=(unsigned char*) RelinquishMagickMemory(stream);
return(image);
}
#endif
/*
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% R e g i s t e r W E B P I m a g e %
% %
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%
% RegisterWEBPImage() adds attributes for the WebP image format to
% the list of supported formats. The attributes include the image format
% tag, a method to read and/or write the format, whether the format
% supports the saving of more than one frame to the same file or blob,
% whether the format supports native in-memory I/O, and a brief
% description of the format.
%
% The format of the RegisterWEBPImage method is:
%
% size_t RegisterWEBPImage(void)
%
*/
ModuleExport size_t RegisterWEBPImage(void)
{
char
version[MaxTextExtent];
MagickInfo
*entry;
*version='\0';
entry=SetMagickInfo("WEBP");
#if defined(MAGICKCORE_WEBP_DELEGATE)
entry->decoder=(DecodeImageHandler *) ReadWEBPImage;
entry->encoder=(EncodeImageHandler *) WriteWEBPImage;
(void) FormatLocaleString(version,MaxTextExtent,"libwebp %d.%d.%d",
(WebPGetDecoderVersion() >> 16) & 0xff,
(WebPGetDecoderVersion() >> 8) & 0xff,
(WebPGetDecoderVersion() >> 0) & 0xff);
#endif
entry->description=ConstantString("WebP Image Format");
entry->adjoin=MagickFalse;
entry->module=ConstantString("WEBP");
entry->magick=(IsImageFormatHandler *) IsWEBP;
if (*version != '\0')
entry->version=ConstantString(version);
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
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% U n r e g i s t e r W E B P I m a g e %
% %
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%
% UnregisterWEBPImage() removes format registrations made by the WebP module
% from the list of supported formats.
%
% The format of the UnregisterWEBPImage method is:
%
% UnregisterWEBPImage(void)
%
*/
ModuleExport void UnregisterWEBPImage(void)
{
(void) UnregisterMagickInfo("WEBP");
}
#if defined(MAGICKCORE_WEBP_DELEGATE)
/*
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% W r i t e W E B P I m a g e %
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% WriteWEBPImage() writes an image in the WebP image format.
%
% The format of the WriteWEBPImage method is:
%
% MagickBooleanType WriteWEBPImage(const ImageInfo *image_info,
% Image *image)
%
% A description of each parameter follows.
%
% o image_info: the image info.
%
% o image: The image.
%
*/
static int WebPWriter(const unsigned char *stream,size_t length,
const WebPPicture *const picture)
{
Image
*image;
image=(Image *) picture->custom_ptr;
return(length != 0 ? (int) WriteBlob(image,length,stream) : 1);
}
static MagickBooleanType WriteWEBPImage(const ImageInfo *image_info,
Image *image)
{
const char
*value;
int
webp_status;
MagickBooleanType
status;
MemoryInfo
*pixel_info;
register uint32_t
*restrict q;
ssize_t
y;
WebPConfig
configure;
WebPPicture
picture;
WebPAuxStats
statistics;
/*
Open output image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
if ((image->columns > 16383UL) || (image->rows > 16383UL))
ThrowWriterException(ImageError,"WidthOrHeightExceedsLimit");
status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
if (status == MagickFalse)
return(status);
if ((WebPPictureInit(&picture) == 0) || (WebPConfigInit(&configure) == 0))
ThrowWriterException(ResourceLimitError,"UnableToEncodeImageFile");
picture.writer=WebPWriter;
picture.custom_ptr=(void *) image;
picture.stats=(&statistics);
picture.width=(int) image->columns;
picture.height=(int) image->rows;
picture.argb_stride=(int) image->columns;
picture.use_argb=1;
if (image->quality != UndefinedCompressionQuality)
configure.quality=(float) image->quality;
else
if (image->quality >= 100)
configure.lossless=1;
value=GetImageOption(image_info,"webp:lossless");
if (value != (char *) NULL)
configure.lossless=ParseCommandOption(MagickBooleanOptions,MagickFalse,
value);
value=GetImageOption(image_info,"webp:method");
if (value != (char *) NULL)
configure.method=StringToInteger(value);
value=GetImageOption(image_info,"webp:image-hint");
if (value != (char *) NULL)
{
if (LocaleCompare(value,"graph") == 0)
configure.image_hint=WEBP_HINT_GRAPH;
if (LocaleCompare(value,"photo") == 0)
configure.image_hint=WEBP_HINT_PHOTO;
if (LocaleCompare(value,"picture") == 0)
configure.image_hint=WEBP_HINT_PICTURE;
}
value=GetImageOption(image_info,"webp:target-size");
if (value != (char *) NULL)
configure.target_size=StringToInteger(value);
value=GetImageOption(image_info,"webp:target-psnr");
if (value != (char *) NULL)
configure.target_PSNR=(float) StringToDouble(value,(char **) NULL);
value=GetImageOption(image_info,"webp:segments");
if (value != (char *) NULL)
configure.segments=StringToInteger(value);
value=GetImageOption(image_info,"webp:sns-strength");
if (value != (char *) NULL)
configure.sns_strength=StringToInteger(value);
value=GetImageOption(image_info,"webp:filter-strength");
if (value != (char *) NULL)
configure.filter_strength=StringToInteger(value);
value=GetImageOption(image_info,"webp:filter-sharpness");
if (value != (char *) NULL)
configure.filter_sharpness=StringToInteger(value);
value=GetImageOption(image_info,"webp:filter-type");
if (value != (char *) NULL)
configure.filter_type=StringToInteger(value);
value=GetImageOption(image_info,"webp:auto-filter");
if (value != (char *) NULL)
configure.autofilter=ParseCommandOption(MagickBooleanOptions,MagickFalse,
value);
value=GetImageOption(image_info,"webp:alpha-compression");
if (value != (char *) NULL)
configure.alpha_compression=StringToInteger(value);
value=GetImageOption(image_info,"webp:alpha-filtering");
if (value != (char *) NULL)
configure.alpha_filtering=StringToInteger(value);
value=GetImageOption(image_info,"webp:alpha-quality");
if (value != (char *) NULL)
configure.alpha_quality=StringToInteger(value);
value=GetImageOption(image_info,"webp:pass");
if (value != (char *) NULL)
configure.pass=StringToInteger(value);
value=GetImageOption(image_info,"webp:show-compressed");
if (value != (char *) NULL)
configure.show_compressed=StringToInteger(value);
value=GetImageOption(image_info,"webp:preprocessing");
if (value != (char *) NULL)
configure.preprocessing=StringToInteger(value);
value=GetImageOption(image_info,"webp:partitions");
if (value != (char *) NULL)
configure.partitions=StringToInteger(value);
value=GetImageOption(image_info,"webp:partition-limit");
if (value != (char *) NULL)
configure.partition_limit=StringToInteger(value);
if (WebPValidateConfig(&configure) == 0)
ThrowWriterException(ResourceLimitError,"UnableToEncodeImageFile");
/*
Allocate memory for pixels.
*/
if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
(void) TransformImageColorspace(image,sRGBColorspace);
pixel_info=AcquireVirtualMemory(image->columns,image->rows*
sizeof(*picture.argb));
if (pixel_info == (MemoryInfo *) NULL)
ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
picture.argb=(uint32_t *) GetVirtualMemoryBlob(pixel_info);
/*
Convert image to WebP raster pixels.
*/
q=picture.argb;
for (y=0; y < (ssize_t) image->rows; y++)
{
register const PixelPacket
*restrict p;
register ssize_t
x;
p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
if (p == (PixelPacket *) NULL)
break;
for (x=0; x < (ssize_t) image->columns; x++)
{
*q++=(uint32_t) (image->matte != MagickFalse ?
ScaleQuantumToChar(GetPixelAlpha(p)) << 24 : 0xff000000u) |
(ScaleQuantumToChar(GetPixelRed(p)) << 16) |
(ScaleQuantumToChar(GetPixelGreen(p)) << 8) |
(ScaleQuantumToChar(GetPixelBlue(p)));
p++;
}
status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
webp_status=WebPEncode(&configure,&picture);
WebPPictureFree(&picture);
pixel_info=RelinquishVirtualMemory(pixel_info);
(void) CloseBlob(image);
return(webp_status == 0 ? MagickFalse : MagickTrue);
}
#endif