/*
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% GGGG RRRR AAA Y Y %
% G R R A A Y Y %
% G GG RRRR AAAAA Y %
% G G R R A A Y %
% GGG R R A A Y %
% %
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% 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
WriteGRAYImage(const ImageInfo *,Image *);
/*
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% R e a d G R A Y I m a g e %
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% Method ReadGRAYImage reads an image of raw grayscale bytes 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 ReadGRAYImage method is:
%
% Image *ReadGRAYImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadGRAYImage 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 *ReadGRAYImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
Image
*image;
int
count,
y;
register int
i,
x;
unsigned char
*scanline;
unsigned int
packet_size,
status;
/*
Open image file.
*/
image=AllocateImage(image_info);
if ((image->columns == 0) || (image->rows == 0))
ThrowReaderException(OptionWarning,"Must specify image size",image);
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);
/*
Allocate memory for a scanline.
*/
packet_size=image->depth > 8 ? 2 : 1;
scanline=(unsigned char *) AcquireMemory(packet_size*image->tile_info.width);
if (scanline == (unsigned char *) NULL)
ThrowReaderException(ResourceLimitWarning,"Memory allocation failed",image);
if (image_info->subrange != 0)
while (image->scene < image_info->subimage)
{
/*
Skip to next image.
*/
image->scene++;
for (y=0; y < (int) image->rows; y++)
(void) ReadBlob(image,packet_size*image->tile_info.width,scanline);
}
x=packet_size*image->tile_info.x;
do
{
/*
Convert raster image to pixel packets.
*/
if (!AllocateImageColormap(image,1 << image->depth))
ThrowReaderException(ResourceLimitWarning,"Memory allocation failed",
image);
for (y=0; y < image->tile_info.y; y++)
(void) ReadBlob(image,packet_size*image->tile_info.width,scanline);
for (y=0; y < (int) image->rows; y++)
{
if ((y > 0) || (image->previous == (Image *) NULL))
(void) ReadBlob(image,packet_size*image->tile_info.width,scanline);
if (!SetImagePixels(image,0,y,image->columns,1))
break;
(void) PushImagePixels(image,GrayQuantum,scanline+x);
if (!SyncImagePixels(image))
break;
if (image->previous == (Image *) NULL)
if (QuantumTick(y,image->rows))
MagickMonitor(LoadImageText,y,image->rows);
}
count=image->tile_info.height-image->rows-image->tile_info.y;
for (y=0; y < count; y++)
(void) ReadBlob(image,packet_size*image->tile_info.width,scanline);
if (EOFBlob(image))
ThrowReaderException(CorruptImageWarning,"not enough scanline",image);
/*
Proceed to next image.
*/
if (image_info->subrange != 0)
if (image->scene >= (image_info->subimage+image_info->subrange-1))
break;
count=ReadBlob(image,packet_size*image->tile_info.width,scanline);
if (count > 0)
{
/*
Allocate next image structure.
*/
AllocateNextImage(image_info,image);
if (image->next == (Image *) NULL)
{
DestroyImages(image);
return((Image *) NULL);
}
image=image->next;
MagickMonitor(LoadImagesText,TellBlob(image),image->filesize);
}
} while (count > 0);
LiberateMemory((void **) &scanline);
while (image->previous != (Image *) NULL)
image=image->previous;
CloseBlob(image);
return(image);
}
/*
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% R e g i s t e r G R A Y I m a g e %
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% Method RegisterGRAYImage adds attributes for the GRAY 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 RegisterGRAYImage method is:
%
% RegisterGRAYImage(void)
%
*/
ModuleExport void RegisterGRAYImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("GRAY");
entry->decoder=ReadGRAYImage;
entry->encoder=WriteGRAYImage;
entry->raw=True;
entry->description=AllocateString("Raw gray bytes");
entry->module=AllocateString("GRAY");
RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r G R A Y I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterGRAYImage removes format registrations made by the
% GRAY module from the list of supported formats.
%
% The format of the UnregisterGRAYImage method is:
%
% UnregisterGRAYImage(void)
%
*/
ModuleExport void UnregisterGRAYImage(void)
{
UnregisterMagickInfo("GRAY");
}
/*
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% W r i t e G R A Y I m a g e %
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% Method WriteGRAYImage writes an image to a file as gray scale intensity
% values.
%
% The format of the WriteGRAYImage method is:
%
% unsigned int WriteGRAYImage(const ImageInfo *image_info,Image *image)
%
% A description of each parameter follows.
%
% o status: Method WriteGRAYImage 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.
%
%
*/
static unsigned int WriteGRAYImage(const ImageInfo *image_info,Image *image)
{
int
y;
unsigned char
*scanline;
unsigned int
packet_size,
scene,
status;
/*
Open output image file.
*/
status=OpenBlob(image_info,image,WriteBinaryType);
if (status == False)
ThrowWriterException(FileOpenWarning,"Unable to open file",image);
/*
Convert image to gray scale PseudoColor class.
*/
scene=0;
do
{
/*
Allocate memory for scanline.
*/
TransformRGBImage(image,RGBColorspace);
packet_size=image->depth > 8 ? 2: 1;
scanline=(unsigned char *) AcquireMemory(packet_size*image->columns);
if (scanline == (unsigned char *) NULL)
ThrowWriterException(ResourceLimitWarning,"Memory allocation failed",
image);
/*
Convert MIFF to GRAY raster scanline.
*/
for (y=0; y < (int) image->rows; y++)
{
if (!GetImagePixels(image,0,y,image->columns,1))
break;
(void) PopImagePixels(image,GrayQuantum,scanline);
(void) WriteBlob(image,packet_size*image->columns,scanline);
if (image->previous == (Image *) NULL)
if (QuantumTick(y,image->rows))
MagickMonitor(SaveImageText,y,image->rows);
}
LiberateMemory((void **) &scanline);
if (image->next == (Image *) NULL)
break;
image=GetNextImage(image);
MagickMonitor(SaveImagesText,scene++,GetNumberScenes(image));
} while (image_info->adjoin);
if (image_info->adjoin)
while (image->previous != (Image *) NULL)
image=image->previous;
CloseBlob(image);
return(True);
}
