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/*
% 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.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% PPPP IIIII X X %
% P P I X X %
% PPPP I X %
% P I X X %
% P IIIII X X %
% %
% %
% Read Alias/Wavefront RLE Image Format. %
% %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/colormap.h"
#include "magick/magick.h"
#include "magick/monitor.h"
#include "magick/pixel_cache.h"
#include "magick/utility.h"
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d P I X I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ReadPIXImage reads a Alias/Wavefront RLE 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 ReadPIXImage method is:
%
% Image *ReadPIXImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadPIXImage 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 *ReadPIXImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
Image
*image;
IndexPacket
index;
long
y;
Quantum
blue,
green,
red;
register IndexPacket
*indexes;
register long
x;
register PixelPacket
*q;
int
length;
MagickPassFail
status;
unsigned int
bits_per_pixel;
unsigned long
height,
width;
/*
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);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFail)
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
/*
Read PIX image.
*/
width=ReadBlobMSBShort(image);
height=ReadBlobMSBShort(image);
(void) ReadBlobMSBShort(image); /* x-offset */
(void) ReadBlobMSBShort(image); /* y-offset */
bits_per_pixel=ReadBlobMSBShort(image);
if ((EOFBlob(image)) ||
(width == 0) || (height == 0) ||
((bits_per_pixel != 8) && (bits_per_pixel != 24)))
ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
do
{
/*
Initialize image structure.
*/
image->columns= width;
image->rows= height;
if (bits_per_pixel == 8)
if (!AllocateImageColormap(image,256))
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
if (image_info->ping && (image_info->subrange != 0))
if (image->scene >= (image_info->subimage+image_info->subrange-1))
break;
if (CheckImagePixelLimits(image, exception) != MagickPass)
ThrowReaderException(ResourceLimitError,ImagePixelLimitExceeded,image);
/*
Convert PIX raster image to pixel packets.
*/
red=0;
green=0;
blue=0;
index=0;
length=0;
for (y=0; y < (long) image->rows; y++)
{
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
indexes=AccessMutableIndexes(image);
for (x=0; x < (long) image->columns; x++)
{
if (length <= 0)
{
if ((length=ReadBlobByte(image)) == EOF)
break;
if (length == 0)
ThrowReaderException(CorruptImageError,UnableToRunlengthDecodeImage,image);
if (bits_per_pixel == 8)
index=ScaleCharToQuantum(ReadBlobByte(image));
else
{
blue=ScaleCharToQuantum(ReadBlobByte(image));
green=ScaleCharToQuantum(ReadBlobByte(image));
red=ScaleCharToQuantum(ReadBlobByte(image));
}
}
if (image->storage_class == PseudoClass)
{
VerifyColormapIndex(image,index);
indexes[x]=index;
}
q->blue=blue;
q->green=green;
q->red=red;
length--;
q++;
}
if (EOFBlob(image))
break;
if (!SyncImagePixels(image))
break;
if (image->previous == (Image *) NULL)
if (!MagickMonitorFormatted(y,image->rows,exception,LoadImageText,
image->filename,
image->columns,image->rows))
break;
}
if (EOFBlob(image))
ThrowReaderException(CorruptImageError,UnexpectedEndOfFile,image);
if (image->storage_class == PseudoClass)
(void) SyncImage(image);
/*
Proceed to next image.
*/
if (image_info->subrange != 0)
if (image->scene >= (image_info->subimage+image_info->subrange-1))
break;
width=ReadBlobMSBLong(image);
height=ReadBlobMSBLong(image);
(void) ReadBlobMSBShort(image);
(void) ReadBlobMSBShort(image);
bits_per_pixel=ReadBlobMSBShort(image);
status=(!EOFBlob(image)) && (width != 0U) && (height != 0U) &&
((bits_per_pixel == 8) || (bits_per_pixel == 24));
if (status == MagickPass)
{
/*
Allocate next image structure.
*/
AllocateNextImage(image_info,image);
if (image->next == (Image *) NULL)
{
DestroyImageList(image);
return((Image *) NULL);
}
image=SyncNextImageInList(image);
if (!MagickMonitorFormatted(TellBlob(image),GetBlobSize(image),exception,
LoadImagesText,image->filename))
break;
}
} while (status == MagickPass);
while (image->previous != (Image *) NULL)
image=image->previous;
CloseBlob(image);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r P I X I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterPIXImage adds attributes for the PIX 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 RegisterPIXImage method is:
%
% RegisterPIXImage(void)
%
*/
ModuleExport void RegisterPIXImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("PIX");
entry->decoder=(DecoderHandler) ReadPIXImage;
entry->description="Alias/Wavefront RLE image format";
entry->module="PIX";
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r P I X I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterPIXImage removes format registrations made by the
% PIX module from the list of supported formats.
%
% The format of the UnregisterPIXImage method is:
%
% UnregisterPIXImage(void)
%
*/
ModuleExport void UnregisterPIXImage(void)
{
(void) UnregisterMagickInfo("PIX");
}
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