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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% SSSSS TTTTT RRRR EEEEE AAA M M %
% SS T R R E A A MM MM %
% SSS T RRRR EEE AAAAA M M M %
% SS T R R E A A M M %
% SSSSS T R R EEEEE A A M M %
% %
% %
% ImageMagick Pixel Stream Methods %
% %
% Software Design %
% John Cristy %
% March 2000 %
% %
% %
% Copyright 1999-2004 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/www/Copyright.html %
% %
% 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/blob.h"
#include "magick/cache.h"
#include "magick/constitute.h"
#include "magick/error.h"
#include "magick/memory_.h"
#include "magick/semaphore.h"
#include "magick/string_.h"
/*
Typedef declaractions.
*/
typedef CacheInfo StreamInfo;
/*
Declare pixel cache interfaces.
*/
#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif
static const PixelPacket
*AcquirePixelStream(const Image *,const long,const long,const unsigned long,
const unsigned long,ExceptionInfo *);
static IndexPacket
*GetIndexesFromStream(const Image *);
static PixelPacket
AcquireOnePixelFromStream(const Image *,const long,const long,
ExceptionInfo *),
GetOnePixelFromStream(Image *,const long,const long),
*GetPixelStream(Image *,const long,const long,const unsigned long,
const unsigned long),
*GetPixelsFromStream(const Image *),
*SetPixelStream(Image *,const long,const long,const unsigned long,
const unsigned long);
static MagickBooleanType
SyncPixelStream(Image *);
static void
DestroyPixelStream(Image *);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ A c q u i r e O n e P i x e l F r o m S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% AcquireOnePixelFromStream() returns a single pixel at the specified (x.y)
% location. The image background color is returned if an error occurs.
%
% The format of the AcquireOnePixelFromStream() method is:
%
% PixelPacket *AcquireOnePixelFromStream(const Image image,const long x,
% const long y,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o pixels: Method GetOnePixelFromStream returns a pixel at the specified
% (x,y) location.
%
% o image: The image.
%
% o x,y: These values define the location of the pixel to return.
%
% o exception: Return any errors or warnings in this structure.
%
%
*/
static PixelPacket AcquireOnePixelFromStream(const Image *image,const long x,
const long y,ExceptionInfo *exception)
{
register const PixelPacket
*pixel;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
pixel=AcquirePixelStream(image,x,y,1,1,exception);
if (pixel != (PixelPacket *) NULL)
return(*pixel);
return(image->background_color);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ A c q u i r e P i x e l S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% AcquirePixelStream() gets pixels from the in-memory or disk pixel cache as
% defined by the geometry parameters. A pointer to the pixels is returned if
% the pixels are transferred, otherwise a NULL is returned. For streams this
% method is a no-op.
%
% The format of the AcquirePixelStream() method is:
%
% const PixelPacket *AcquirePixelStream(const Image *image,const long x,
% const long y,const unsigned long columns,const unsigned long rows,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o x,y,columns,rows: These values define the perimeter of a region of
% pixels.
%
% o exception: Return any errors or warnings in this structure.
%
%
*/
static const PixelPacket *AcquirePixelStream(const Image *image,const long x,
const long y,const unsigned long columns,const unsigned long rows,
ExceptionInfo *exception)
{
MagickSizeType
number_pixels;
size_t
length;
StreamInfo
*stream_info;
/*
Validate pixel cache geometry.
*/
assert(image != (const Image *) NULL);
assert(image->signature == MagickSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),image->filename);
if ((x < 0) || (y < 0) || ((x+(long) columns) > (long) image->columns) ||
((y+(long) rows) > (long) image->rows) || (columns == 0) || (rows == 0))
{
(void) ThrowMagickException(exception,GetMagickModule(),StreamError,
"ImageDoesNotContainTheStreamGeometry",image->filename);
return((PixelPacket *) NULL);
}
stream_info=(StreamInfo *) image->cache;
assert(stream_info->signature == MagickSignature);
if (stream_info->type == UndefinedCache)
{
(void) ThrowMagickException(exception,GetMagickModule(),StreamError,
"PixelCacheIsNotOpen",image->filename);
return((PixelPacket *) NULL);
}
/*
Pixels are stored in a temporary buffer until they are synced to the cache.
*/
number_pixels=(MagickSizeType) columns*rows;
length=(size_t) number_pixels*sizeof(PixelPacket);
if ((image->storage_class == PseudoClass) ||
(image->colorspace == CMYKColorspace))
length+=number_pixels*sizeof(IndexPacket);
if (stream_info->pixels == (PixelPacket *) NULL)
stream_info->pixels=(PixelPacket *) AcquireMagickMemory(length);
else
if ((MagickSizeType) length != stream_info->length)
stream_info->pixels=(PixelPacket *)
ResizeMagickMemory(stream_info->pixels,length);
if (stream_info->pixels == (void *) NULL)
ThrowMagickFatalException(ResourceLimitFatalError,
"UnableToAllocateCacheInfo",image->filename);
stream_info->length=(MagickSizeType) length;
stream_info->indexes=(IndexPacket *) NULL;
if ((image->storage_class == PseudoClass) ||
(image->colorspace == CMYKColorspace))
stream_info->indexes=(IndexPacket *) (stream_info->pixels+number_pixels);
return(stream_info->pixels);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ D e s t r o y P i x e l S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DestroyPixelStream() deallocates memory associated with the pixel stream.
%
% The format of the DestroyPixelStream() method is:
%
% void DestroyPixelStream(Image *image)
%
% A description of each parameter follows:
%
% o image: The image.
%
%
*/
static void DestroyPixelStream(Image *image)
{
StreamInfo
*stream_info;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),image->filename);
stream_info=(StreamInfo *) image->cache;
assert(stream_info->signature == MagickSignature);
AcquireSemaphoreInfo((SemaphoreInfo **) &stream_info->semaphore);
stream_info->reference_count--;
if (stream_info->reference_count > 0)
{
RelinquishSemaphoreInfo((SemaphoreInfo **) &stream_info->semaphore);
return;
}
if (stream_info->pixels != (PixelPacket *) NULL)
stream_info->pixels=(PixelPacket *)
RelinquishMagickMemory(stream_info->pixels);
RelinquishSemaphoreInfo((SemaphoreInfo **) &stream_info->semaphore);
DestroySemaphoreInfo((SemaphoreInfo **) &stream_info->semaphore);
stream_info=(StreamInfo *) RelinquishMagickMemory(stream_info);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ G e t I n d e x e s F r o m S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetIndexesFromStream() returns the indexes associated with the last call to
% SetPixelStream() or GetPixelStream().
%
% The format of the GetIndexesFromStream() method is:
%
% IndexPacket *GetIndexesFromStream(const Image *image)
%
% A description of each parameter follows:
%
% o indexes: Method GetIndexesFromStream() returns the indexes associated
% with the last call to SetPixelStream() or GetPixelStream().
%
% o image: The image.
%
%
*/
static IndexPacket *GetIndexesFromStream(const Image *image)
{
StreamInfo
*stream_info;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),image->filename);
stream_info=(StreamInfo *) image->cache;
assert(stream_info->signature == MagickSignature);
return(stream_info->indexes);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ G e t O n e P i x e l F r o m S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetOnePixelFromStream() returns a single pixel at the specified (x,y)
% location. The image background color is returned if an error occurs.
%
% The format of the GetOnePixelFromStream() method is:
%
% PixelPacket *GetOnePixelFromStream(const Image image,const long x,
% const long y)
%
% A description of each parameter follows:
%
% o pixels: Method GetOnePixelFromStream returns a pixel at the specified
% (x,y) location.
%
% o image: The image.
%
% o x,y: These values define the location of the pixel to return.
%
*/
static PixelPacket GetOnePixelFromStream(Image *image,const long x,const long y)
{
register PixelPacket
*pixel;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
pixel=GetPixelStream(image,x,y,1,1);
if (pixel != (PixelPacket *) NULL)
return(*pixel);
return(image->background_color);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ G e t P i x e l S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetPixelStream() gets pixels from the in-memory or disk pixel cache as
% defined by the geometry parameters. A pointer to the pixels is returned if
% the pixels are transferred, otherwise a NULL is returned. For streams
% this method is a no-op.
%
% The format of the GetPixelStream() method is:
%
% PixelPacket *GetPixelStream(Image *image,const long x,const long y,
% const unsigned long columns,const unsigned long rows)
%
% A description of each parameter follows:
%
% o image: The image.
%
% o x,y,columns,rows: These values define the perimeter of a region of
% pixels.
%
%
*/
static PixelPacket *GetPixelStream(Image *image,const long x,const long y,
const unsigned long columns,const unsigned long rows)
{
PixelPacket
*pixels;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),image->filename);
pixels=SetPixelStream(image,x,y,columns,rows);
return(pixels);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ G e t P i x e l F r o m S t e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% GetPixelsFromStream() returns the pixels associated with the last call to
% SetPixelStream() or GetPixelStream().
%
% The format of the GetPixelsFromStream() method is:
%
% PixelPacket *GetPixelsFromStream(const Image image)
%
% A description of each parameter follows:
%
% o pixels: Method GetPixelsFromStream returns the pixels associated with
% the last call to SetPixelStream() or GetPixelStream().
%
% o image: The image.
%
%
*/
static PixelPacket *GetPixelsFromStream(const Image *image)
{
StreamInfo
*stream_info;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),image->filename);
stream_info=(StreamInfo *) image->cache;
assert(stream_info->signature == MagickSignature);
return(stream_info->pixels);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% ReadStream() makes the image pixels available to a user supplied
% callback method immediately upon reading a scanline with the ReadImage()
% method.
%
% The format of the ReadStream() method is:
%
% Image *ReadStream(const ImageInfo *image_info,StreamHandler stream,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image_info: The image info.
%
% o stream: a callback method.
%
% o exception: Return any errors or warnings in this structure.
%
%
*/
MagickExport Image *ReadStream(const ImageInfo *image_info,StreamHandler stream,
ExceptionInfo *exception)
{
Image
*image;
ImageInfo
*read_info;
/*
Stream image pixels.
*/
assert(image_info != (ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
read_info=CloneImageInfo(image_info);
GetCacheInfo(&read_info->cache);
SetPixelCacheMethods(read_info->cache,AcquirePixelStream,GetPixelStream,
SetPixelStream,SyncPixelStream,GetPixelsFromStream,GetIndexesFromStream,
AcquireOnePixelFromStream,GetOnePixelFromStream,DestroyPixelStream);
read_info->stream=stream;
image=ReadImage(read_info,exception);
DestroyImageInfo(read_info);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ S e t P i x e l S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% SetPixelStream() allocates an area to store image pixels as defined by the
% region rectangle and returns a pointer to the area. This area is
% subsequently transferred from the pixel cache with method SyncPixelStream().
% A pointer to the pixels is returned if the pixels are transferred,
% otherwise a NULL is returned.
%
% The format of the SetPixelStream() method is:
%
% PixelPacket *SetPixelStream(Image *image,const long x,const long y,
% const unsigned long columns,const unsigned long rows)
%
% A description of each parameter follows:
%
% o pixels: Method SetPixelStream returns a pointer to the pixels is
% returned if the pixels are transferred, otherwise a NULL is returned.
%
% o image: The image.
%
% o x,y,columns,rows: These values define the perimeter of a region of
% pixels.
%
%
*/
static PixelPacket *SetPixelStream(Image *image,const long x,const long y,
const unsigned long columns,const unsigned long rows)
{
MagickSizeType
number_pixels;
size_t
length;
StreamHandler
stream_handler;
StreamInfo
*stream_info;
/*
Validate pixel cache geometry.
*/
assert(image != (Image *) NULL);
if ((x < 0) || (y < 0) || ((x+(long) columns) > (long) image->columns) ||
((y+(long) rows) > (long) image->rows) || (columns == 0) || (rows == 0))
{
(void) ThrowMagickException(&image->exception,GetMagickModule(),
StreamError,"ImageDoesNotContainTheStreamGeometry",image->filename);
return((PixelPacket *) NULL);
}
stream_handler=GetBlobStreamHandler(image);
if (stream_handler == (StreamHandler) NULL)
{
(void) ThrowMagickException(&image->exception,GetMagickModule(),
StreamError,"NoStreamHandlerIsDefined",image->filename);
return((PixelPacket *) NULL);
}
stream_info=(StreamInfo *) image->cache;
assert(stream_info->signature == MagickSignature);
if ((image->storage_class != GetCacheClass(image->cache)) ||
(image->colorspace != GetCacheColorspace(image->cache)))
{
if (GetCacheClass(image->cache) == UndefinedClass)
(void) stream_handler(image,(const void *) NULL,
(size_t) stream_info->columns);
stream_info->storage_class=image->storage_class;
stream_info->colorspace=image->colorspace;
stream_info->columns=image->columns;
stream_info->rows=image->rows;
image->cache=stream_info;
}
/*
Pixels are stored in a temporary buffer until they are synced to the cache.
*/
stream_info->columns=columns;
stream_info->rows=rows;
number_pixels=(MagickSizeType) columns*rows;
length=(size_t) number_pixels*sizeof(PixelPacket);
if ((image->storage_class == PseudoClass) ||
(image->colorspace == CMYKColorspace))
length+=number_pixels*sizeof(IndexPacket);
if (stream_info->pixels == (PixelPacket *) NULL)
{
stream_info->pixels=(PixelPacket *) AcquireMagickMemory(length);
stream_info->length=(MagickSizeType) length;
}
else
if (stream_info->length < (MagickSizeType) length)
{
stream_info->pixels=(PixelPacket *)
ResizeMagickMemory(stream_info->pixels,length);
stream_info->length=(MagickSizeType) length;
}
if (stream_info->pixels == (void *) NULL)
ThrowMagickFatalException(ResourceLimitFatalError,
"UnableToAllocateImagePixels",image->filename);
stream_info->indexes=(IndexPacket *) NULL;
if ((image->storage_class == PseudoClass) ||
(image->colorspace == CMYKColorspace))
stream_info->indexes=(IndexPacket *) (stream_info->pixels+number_pixels);
return(stream_info->pixels);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ S y n c P i x e l S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% SyncPixelStream() calls the user supplied callback method with the latest
% stream of pixels.
%
% The format of the SyncPixelStream method is:
%
% MagickBooleanType SyncPixelStream(Image *image)
%
% A description of each parameter follows:
%
% o image: The image.
%
%
*/
static MagickBooleanType SyncPixelStream(Image *image)
{
MagickBooleanType
status;
StreamHandler
stream_handler;
StreamInfo
*stream_info;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),image->filename);
stream_info=(StreamInfo *) image->cache;
assert(stream_info->signature == MagickSignature);
stream_handler=GetBlobStreamHandler(image);
if (stream_handler == (StreamHandler) NULL)
{
(void) ThrowMagickException(&image->exception,GetMagickModule(),
StreamError,"NoStreamHandlerIsDefined",image->filename);
return(MagickFalse);
}
status=stream_handler(image,stream_info->pixels,(size_t)
stream_info->columns);
return(status);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% W r i t e S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% WriteStream() makes the image pixels available to a user supplied
% callback method immediately upon writing pixel data with the WriteImage()
% method.
%
% The format of the WriteStream() method is:
%
% MagickBooleanType WriteStream(const ImageInfo *image_info,Image *,
% StreamHandler stream)
%
% A description of each parameter follows:
%
% o image_info: The image info.
%
% o stream: A callback method.
%
%
*/
MagickExport MagickBooleanType WriteStream(const ImageInfo *image_info,
Image *image,StreamHandler stream)
{
ImageInfo
*write_info;
MagickBooleanType
status;
assert(image_info != (ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),image_info->filename);
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
write_info=CloneImageInfo(image_info);
write_info->stream=stream;
status=WriteImage(write_info,image);
DestroyImageInfo(write_info);
return(status);
}
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