/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% 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 ImageMagick Image Format. %
% %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% Copyright (C) 2001 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 "defines.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 an ImageInfo structure.
%
% o exception: return any errors or warnings in this structure.
%
%
*/
static Image *ReadUYVYImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
Image
*image;
int
y;
register int
i,
x;
register PixelPacket
*q;
unsigned char
u,
v,
y1,
y2;
unsigned int
status;
/*
Open image file.
*/
image=AllocateImage(image_info);
if ((image->columns == 0) || (image->rows == 0))
ThrowReaderException(OptionWarning,"Must specify image size",image);
(void) strcpy(image->filename,image_info->filename);
status=OpenBlob(image_info,image,ReadBinaryType);
if (status == False)
ThrowReaderException(FileOpenWarning,"Unable to open file",image)
for (i=0; i < image->offset; i++)
(void) ReadBlobByte(image);
/*
Accumulate UYVY, then unpack into two pixels.
*/
image->depth=8;
for (y=0; y < (int) image->rows; y++)
{
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
for (x=0; x < (int) (image->columns >> 1); x++)
{
u=ReadBlobByte(image);
y1=ReadBlobByte(image);
v=ReadBlobByte(image);
y2=ReadBlobByte(image);
q->red=UpScale(y1);
q->green=UpScale(u);
q->blue=UpScale(v);
q++;
q->red=UpScale(y2);
q->green=UpScale(u);
q->blue=UpScale(v);
q++;
}
if (!SyncImagePixels(image))
break;
if (QuantumTick(y,image->rows))
MagickMonitor(LoadImageText,y,image->rows);
}
TransformRGBImage(image,YCbCrColorspace);
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=ReadUYVYImage;
entry->encoder=WriteUYVYImage;
entry->adjoin=False;
entry->raw=True;
entry->description=AllocateString("16bit/pixel interleaved YUV");
entry->module=AllocateString("UYVY");
RegisterMagickInfo(entry);
entry=SetMagickInfo("UYVY");
entry->decoder=ReadUYVYImage;
entry->encoder=WriteUYVYImage;
entry->adjoin=False;
entry->raw=True;
entry->description=AllocateString("16bit/pixel interleaved YUV");
entry->module=AllocateString("UYVY");
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)
{
UnregisterMagickInfo("PAL");
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 an ImageInfo structure.
%
% o image: A pointer to a Image structure.
% Implicit assumption: number of columns is even.
%
*/
static unsigned int WriteUYVYImage(const ImageInfo *image_info,Image *image)
{
int
y;
register int
x;
register PixelPacket
*p;
unsigned int
full,
status,
u,
v,
y1;
/*
Open output image file.
*/
status=OpenBlob(image_info,image,WriteBinaryType);
if (status == False)
ThrowWriterException(FileOpenWarning,"Unable to open file",image);
TransformRGBImage(image,RGBColorspace);
/*
Convert to YUV, at full resolution.
*/
RGBTransformImage(image,YCbCrColorspace);
/*
Accumulate two pixels, then output.
*/
full=False;
u=0;
v=0;
y1=0;
full=False;
for (y=0; y < (int) image->rows; y++)
{
p=GetImagePixels(image,0,y,image->columns,1);
if (p == (PixelPacket *) NULL)
break;
for (x=0; x < (int) image->columns; x++)
{
if (full)
{
(void) WriteBlobByte(image,DownScale((u+p->green) >> 1));
(void) WriteBlobByte(image,DownScale(y1));
(void) WriteBlobByte(image,DownScale((v+p->blue) >> 1));
(void) WriteBlobByte(image,DownScale(p->red));
full=False;
}
else
{
y1=p->red;
u=p->green;
v=p->blue;
full=True;
}
p++;
}
if (QuantumTick(y,image->rows))
MagickMonitor(SaveImageText,y,image->rows);
}
TransformRGBImage(image,YCbCrColorspace);
CloseBlob(image);
return(True);
}