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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 (C) 2002 ImageMagick Studio, a non-profit organization dedicated %
% to making software imaging solutions freely available. %
% %
% Permission is hereby granted, free of charge, to any person obtaining a %
% copy of this software and associated documentation files ("ImageMagick"), %
% to deal in ImageMagick without restriction, including without limitation %
% the rights to use, copy, modify, merge, publish, distribute, sublicense, %
% and/or sell copies of ImageMagick, and to permit persons to whom the %
% ImageMagick is furnished to do so, subject to the following conditions: %
% %
% The above copyright notice and this permission notice shall be included in %
% all copies or substantial portions of ImageMagick. %
% %
% The software is provided "as is", without warranty of any kind, express or %
% implied, including but not limited to the warranties of merchantability, %
% fitness for a particular purpose and noninfringement. In no event shall %
% ImageMagick Studio be liable for any claim, damages or other liability, %
% whether in an action of contract, tort or otherwise, arising from, out of %
% or in connection with ImageMagick or the use or other dealings in %
% ImageMagick. %
% %
% Except as contained in this notice, the name of the ImageMagick Studio %
% shall not be used in advertising or otherwise to promote the sale, use or %
% other dealings in ImageMagick without prior written authorization from the %
% ImageMagick Studio. %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
%
*/
/*
Include declarations.
*/
#include "magick.h"
#include "define.h"
/*
Typedef declaractions.
*/
typedef CacheInfo
StreamInfo;
/*
Declare pixel stream interfaces.
*/
static const PixelPacket
*AcquirePixelStream(const Image *,const long,const long,const unsigned long,
const unsigned long,ExceptionInfo *);
static PixelPacket
*GetPixelStream(Image *,const long,const long,const unsigned long,
const unsigned long),
*SetPixelStream(Image *,const long,const long,const unsigned long,
const unsigned long);
static unsigned int
SyncPixelStream(Image *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ 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 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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 status: Method GetPixelStream() returns a pointer to the pixels if they
% 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.
%
% 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)
{
off_t
offset;
StreamInfo
*stream_info;
unsigned long
number_pixels;
/*
Validate pixel cache geometry.
*/
assert(image != (const Image *) NULL);
if ((x < 0) || (y < 0) || ((x+(long) columns) > (long) image->columns) ||
((y+(long) rows) > (long) image->rows) || (columns == 0) || (rows == 0))
{
ThrowException(exception,StreamWarning,"Unable to acquire pixel stream",
"image does not contain the stream geometry");
return((PixelPacket *) NULL);
}
stream_info=(StreamInfo *) image->cache;
assert(stream_info->signature == MagickSignature);
if (stream_info->type == UndefinedCache)
{
ThrowException(exception,CacheWarning,"Pixel cache is not open",
image->filename);
return((PixelPacket *) NULL);
}
/*
Pixels are stored in a temporary buffer until they are synced to the cache.
*/
number_pixels=columns*rows;
offset=number_pixels*sizeof(PixelPacket);
if ((image->storage_class == PseudoClass) ||
(image->colorspace == CMYKColorspace))
offset+=number_pixels*sizeof(IndexPacket);
if (stream_info->pixels == (PixelPacket *) NULL)
stream_info->pixels=(PixelPacket *) AcquireMemory(offset);
else
if (offset != stream_info->length)
ReacquireMemory((void **) &stream_info->pixels,offset);
if (stream_info->pixels == (void *) NULL)
MagickError(ResourceLimitError,"Memory allocation failed",
"unable to allocate cache info");
stream_info->length=offset;
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 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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)
{
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ G e t I n d e x e s F r o m S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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);
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 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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 status: Method GetPixelStream() returns a pointer to the pixels if they
% 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 *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);
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 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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);
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,
% void (*Stream)(const Image *,const void *,const size_t),
% 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,
int (*fifo)(const Image *,const void *,const size_t),ExceptionInfo *exception)
{
Image
*image;
ImageInfo
*clone_info;
register Image
*p;
StreamInfo
*stream_info;
/*
Stream image pixels.
*/
assert(image_info != (ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
SetPixelCacheMethods(AcquirePixelStream,GetPixelStream,SetPixelStream,
SyncPixelStream,GetPixelsFromStream,GetIndexesFromStream,
AcquireOnePixelFromStream,GetOnePixelFromStream,DestroyPixelStream);
clone_info=CloneImageInfo(image_info);
clone_info->fifo=fifo;
image=ReadImage(clone_info,exception);
DestroyImageInfo(clone_info);
for (p=image; p != (Image *) NULL; p=p->next)
{
stream_info=(StreamInfo *) p->cache;
assert(stream_info->signature == MagickSignature);
if (stream_info->pixels != (PixelPacket *) NULL)
LiberateMemory((void **) &stream_info->pixels);
LiberateMemory((void **) &stream_info);
}
ResetPixelCacheMethods();
for (p=image; p != (Image *) NULL; p=p->next)
GetCacheInfo(&p->cache);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
+ S e t P i x e l S t r e a m %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method 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)
{
off_t
offset;
StreamInfo
*stream_info;
unsigned long
number_pixels;
/*
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))
{
ThrowException(&image->exception,StreamWarning,
"Unable to set pixel stream","image does not contain the geometry");
return((PixelPacket *) NULL);
}
if (image->fifo == (int (*)(const Image *,const void *,const size_t)) NULL)
{
ThrowException(&image->exception,StreamWarning,
"Unable to set pixel stream","no fifo is defined");
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) image->fifo(image,(const void *) NULL,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.
*/
number_pixels=columns*rows;
offset=number_pixels*sizeof(PixelPacket);
if ((image->storage_class == PseudoClass) ||
(image->colorspace == CMYKColorspace))
offset+=number_pixels*sizeof(IndexPacket);
if (stream_info->pixels == (PixelPacket *) NULL)
stream_info->pixels=(PixelPacket *) AcquireMemory(offset);
else
if (offset != stream_info->length)
ReacquireMemory((void **) &stream_info->pixels,offset);
if (stream_info->pixels == (void *) NULL)
MagickError(ResourceLimitError,"Memory allocation failed",
"unable to allocate cache info");
stream_info->length=offset;
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 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method SyncPixelStream() calls the user supplied callback method with the
% latest stream of pixels.
%
% The format of the SyncPixelStream method is:
%
% unsigned int SyncPixelStream(Image *image)
%
% A description of each parameter follows:
%
% o status: Method SyncPixelStream() returns True if the image pixels are
% transferred to the in-memory or disk cache otherwise False.
%
% o image: The image.
%
%
*/
static unsigned int SyncPixelStream(Image *image)
{
StreamInfo
*stream_info;
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
stream_info=(StreamInfo *) image->cache;
assert(stream_info->signature == MagickSignature);
return(image->fifo(image,stream_info->pixels,stream_info->columns));
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% 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:
%
% unsigned int WriteStream(const ImageInfo *image_info,Image *,
% int (*Stream)(const Image *,const void *,const size_t))
%
% A description of each parameter follows:
%
% o image_info: The image info.
%
% o stream: A callback method.
%
%
*/
MagickExport unsigned int WriteStream(const ImageInfo *image_info,Image *image,
int (*fifo)(const Image *,const void *,const size_t))
{
ImageInfo
*clone_info;
unsigned int
status;
assert(image_info != (ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
clone_info=CloneImageInfo(image_info);
clone_info->fifo=fifo;
status=WriteImage(clone_info,image);
DestroyImageInfo(clone_info);
return(status);
}
|
