/*
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% DDDD PPPP SSSSS %
% D D P P SS %
% D D PPPP SSS %
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% Read/Write ImageMagick Image Format. %
% %
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% Software Design %
% John Cristy %
% March 2001 %
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% %
% 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. %
% %
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%
%
*/
/*
Include declarations.
*/
#include "magick.h"
#include "defines.h"
/*
Forward declarations.
*/
static unsigned int
WriteDPXImage(const ImageInfo *,Image *);
/*
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% R e a d D P X I m a g e %
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% Method ReadDPXImage reads an DPX X image file 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 ReadDPXImage method is:
%
% Image *ReadDPXImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadDPXImage 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 *ReadDPXImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
char
magick[4];
Image
*image;
int
y;
register int
i,
x;
register PixelPacket
*q;
unsigned int
status;
unsigned long
height,
pixel,
width;
/*
Open image file.
*/
image=AllocateImage(image_info);
status=OpenBlob(image_info,image,ReadBinaryType);
if (status == False)
ThrowReaderException(FileOpenWarning,"Unable to open file",image);
/*
Read DPX image.
*/
status=ReadBlob(image,4,(char *) magick);
if ((status == False) || (LocaleNCompare((char *) magick,"SDPX",4) != 0))
ThrowReaderException(CorruptImageWarning,"Not a DPX image file",image);
for (i=0; i < 768; i++)
(void) ReadBlobByte(image);
width=ReadBlobMSBLong(image);
height=ReadBlobMSBLong(image);
for (i=0; i < 7412; i++)
(void) ReadBlobByte(image);
/*
Initialize image structure.
*/
image->columns=width;
image->rows=height;
image->depth=8;
if (image_info->ping)
{
CloseBlob(image);
return(image);
}
/*
Convert DPX raster image to pixel packets.
*/
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; x++)
{
pixel=ReadBlobMSBLong(image);
q->red=MaxRGB*((pixel >> 22) & 0x3ff)/1023;
q->green=MaxRGB*((pixel >> 12) & 0x3ff)/1023;
q->blue=MaxRGB*((pixel >> 2) & 0x3ff)/1023;
q++;
}
if (!SyncImagePixels(image))
break;
if (image->previous == (Image *) NULL)
if (QuantumTick(y,image->rows))
MagickMonitor(LoadImageText,y,image->rows);
}
CloseBlob(image);
return(image);
}
/*
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% R e g i s t e r D P X I m a g e %
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% Method RegisterDPXImage adds attributes for the DPX 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 RegisterDPXImage method is:
%
% RegisterDPXImage(void)
%
*/
ModuleExport void RegisterDPXImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("DPX");
entry->decoder=ReadDPXImage;
entry->description=AllocateString("Digital Moving Picture Exchange");
entry->module=AllocateString("DPX");
RegisterMagickInfo(entry);
}
/*
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% U n r e g i s t e r D P X I m a g e %
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% Method UnregisterDPXImage removes format registrations made by the
% DPX module from the list of supported formats.
%
% The format of the UnregisterDPXImage method is:
%
% UnregisterDPXImage(void)
%
*/
ModuleExport void UnregisterDPXImage(void)
{
UnregisterMagickInfo("DPX");
}
