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DEFINITIONS
This source file includes following definitions.
- ReadUYVYImage
- RegisterUYVYImage
- UnregisterUYVYImage
- WriteUYVYImage
/*
% Copyright (C) 2003 GraphicsMagick Group
% Copyright (C) 2002 ImageMagick Studio
% Copyright 1991-1999 E. I. du Pont de Nemours and Company
%
% This program is covered by multiple licenses, which are described in
% Copyright.txt. You should have received a copy of Copyright.txt with this
% package; otherwise see http://www.graphicsmagick.org/www/Copyright.html.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U U Y Y V V Y Y %
% U U Y Y V V Y Y %
% U U Y V V Y %
% U U Y V V Y %
% UUU Y V Y %
% %
% %
% Read/Write 16bit/pixel Interleaved YUV Image Format. %
% %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/pixel_cache.h"
#include "magick/magick.h"
#include "magick/monitor.h"
#include "magick/utility.h"
/*
Forward declarations.
*/
static unsigned int
WriteUYVYImage(const ImageInfo *,Image *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d U Y V Y I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ReadUYVYImage reads an image in the UYVY format and returns it. It
% allocates the memory necessary for the new Image structure and returns a
% pointer to the new image.
%
% The format of the ReadUYVYImage method is:
%
% Image *ReadUYVYImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadUYVYImage returns a pointer to the image after
% reading. A null image is returned if there is a memory shortage or
% if the image cannot be read.
%
% o image_info: Specifies a pointer to a ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadUYVYImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
Image
*image;
long
y;
register long
x;
register PixelPacket
*q;
register long
i;
unsigned char
u,
v,
y1,
y2;
unsigned int
status;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AllocateImage(image_info);
if ((image->columns == 0) || (image->rows == 0))
ThrowReaderException(OptionError,MustSpecifyImageSize,image);
(void) strlcpy(image->filename,image_info->filename,MaxTextExtent);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == False)
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
/*
When subsampling, image width must be evenly divisible by two.
*/
if (image->columns %2)
ThrowReaderException(CorruptImageError,SubsamplingRequiresEvenWidth,image);
for (i=0; i < image->offset; i++)
{
if (EOF == ReadBlobByte(image))
ThrowException(exception,CorruptImageError,UnexpectedEndOfFile,
image->filename);
}
image->depth=8;
if (image_info->ping)
{
CloseBlob(image);
return(image);
}
/*
Accumulate UYVY, then unpack into two pixels.
*/
for (y=0; y < (long) image->rows; y++)
{
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
for (x=0; x < (long) (image->columns >> 1); x++)
{
u=ReadBlobByte(image);
y1=ReadBlobByte(image);
v=ReadBlobByte(image);
y2=ReadBlobByte(image);
q->red=ScaleCharToQuantum(y1);
q->green=ScaleCharToQuantum(u);
q->blue=ScaleCharToQuantum(v);
q++;
q->red=ScaleCharToQuantum(y2);
q->green=ScaleCharToQuantum(u);
q->blue=ScaleCharToQuantum(v);
q++;
}
if (!SyncImagePixels(image))
break;
if (QuantumTick(y,image->rows))
if (!MagickMonitorFormatted(y,image->rows,exception,LoadImageText,
image->filename,
image->columns,image->rows))
break;
}
image->colorspace=YCbCrColorspace;
(void) TransformColorspace(image,RGBColorspace);
if (EOFBlob(image))
ThrowException(exception,CorruptImageError,UnexpectedEndOfFile,
image->filename);
CloseBlob(image);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r U Y V Y I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterUYVYImage adds attributes for the UYVY 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 RegisterUYVYImage method is:
%
% RegisterUYVYImage(void)
%
*/
ModuleExport void RegisterUYVYImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("PAL");
entry->decoder=(DecoderHandler) ReadUYVYImage;
entry->encoder=(EncoderHandler) WriteUYVYImage;
entry->adjoin=False;
entry->raw=True;
entry->description="16bit/pixel interleaved YUV";
entry->module="UYVY";
(void) RegisterMagickInfo(entry);
entry=SetMagickInfo("UYVY");
entry->decoder=(DecoderHandler) ReadUYVYImage;
entry->encoder=(EncoderHandler) WriteUYVYImage;
entry->adjoin=False;
entry->raw=True;
entry->description="16bit/pixel interleaved YUV";
entry->module="UYVY";
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r U Y V Y I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterUYVYImage removes format registrations made by the
% UYVY module from the list of supported formats.
%
% The format of the UnregisterUYVYImage method is:
%
% UnregisterUYVYImage(void)
%
*/
ModuleExport void UnregisterUYVYImage(void)
{
(void) UnregisterMagickInfo("PAL");
(void) UnregisterMagickInfo("UYVY");
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% W r i t e U Y V Y I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method WriteUYVYImage writes an image to a file in the digital UYVY
% format. This format, used by AccomWSD, is not dramatically higher quality
% than the 12bit/pixel YUV format, but has better locality.
%
% The format of the WriteUYVYImage method is:
%
% unsigned int WriteUYVYImage(const ImageInfo *image_info,Image *image)
%
% A description of each parameter follows.
%
% o status: Method WriteUYVYImage return True if the image is written.
% False is returned is there is a memory shortage or if the image file
% fails to write.
%
% o image_info: Specifies a pointer to a ImageInfo structure.
%
% o image: A pointer to an Image structure.
% Implicit assumption: number of columns is even.
%
*/
static unsigned int WriteUYVYImage(const ImageInfo *image_info,Image *image)
{
DoublePixelPacket
pixel;
long
y;
register const PixelPacket
*p;
register long
x;
unsigned int
full,
status;
ColorspaceType
original_colorspace;
/*
Open output image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
if (status == False)
ThrowWriterException(FileOpenError,UnableToOpenFile,image);
/*
When subsampling, image width must be evenly divisible by two.
*/
if (image->columns %2)
ThrowWriterException(CoderError,SubsamplingRequiresEvenWidth,image);
/*
Convert to YUV, at full resolution.
*/
original_colorspace=image->colorspace;
(void) TransformColorspace(image,YCbCrColorspace);
/*
Accumulate two pixels, then output.
*/
full=False;
(void) memset(&pixel,0,sizeof(DoublePixelPacket));
for (y=0; y < (long) image->rows; y++)
{
p=AcquireImagePixels(image,0,y,image->columns,1,&image->exception);
if (p == (const PixelPacket *) NULL)
break;
for (x=0; x < (long) image->columns; x++)
{
if (full)
{
pixel.green=(pixel.green+p->green)/2;
pixel.blue=(pixel.blue+p->blue)/2;
(void) WriteBlobByte(image,ScaleQuantumToChar(pixel.green));
(void) WriteBlobByte(image,ScaleQuantumToChar(pixel.red));
(void) WriteBlobByte(image,ScaleQuantumToChar(pixel.blue));
(void) WriteBlobByte(image,ScaleQuantumToChar(p->red));
}
pixel.red=p->red;
pixel.green=p->green;
pixel.blue=p->blue;
full=!full;
p++;
}
if (QuantumTick(y,image->rows))
if (!MagickMonitorFormatted(y,image->rows,&image->exception,
SaveImageText,image->filename,
image->columns,image->rows))
break;
}
/*
Restore colorspace
*/
(void) TransformColorspace(image,original_colorspace);
CloseBlob(image);
return(True);
}