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DEFINITIONS
This source file includes following definitions.
- ReadMAPImage
- RegisterMAPImage
- UnregisterMAPImage
- WriteMAPImage
/*
% 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.
%
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% %
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% M M AAA PPPP %
% MM MM A A P P %
% M M M AAAAA PPPP %
% M M A A P %
% M M A A P %
% %
% %
% Read/Write Image Colormaps As An Image File %
% %
% %
% Software Design %
% John Cristy %
% July 1992 %
% %
% %
% %
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%
%
*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/blob.h"
#include "magick/color.h"
#include "magick/colormap.h"
#include "magick/magick.h"
#include "magick/pixel_cache.h"
#include "magick/utility.h"
/*
Forward declarations.
*/
static unsigned int
WriteMAPImage(const ImageInfo *,Image *);
/*
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% R e a d M A P I m a g e %
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% Method ReadMAPImage reads an image of raw RGB colormap and colormap index
% 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 ReadMAPImage method is:
%
% Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadMAPImage 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 *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
Image
*image;
IndexPacket
index;
long
y;
register IndexPacket
*indexes;
register long
x;
register PixelPacket
*q;
register long
i;
register unsigned char
*p;
unsigned char
*colormap,
*pixels;
unsigned int
packet_size,
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);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == False)
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
/*
Initialize image structure.
*/
image->storage_class=PseudoClass;
if (!AllocateImageColormap(image,image->offset ? image->offset : 256))
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
packet_size=image->depth > 8 ? 2 : 1;
pixels=MagickAllocateMemory(unsigned char *,packet_size*image->columns);
packet_size=image->colors > 256 ? 6 : 3;
colormap=MagickAllocateMemory(unsigned char *,packet_size*image->colors);
if ((pixels == (unsigned char *) NULL) ||
(colormap == (unsigned char *) NULL))
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
/*
Read image colormap.
*/
(void) ReadBlob(image,packet_size*image->colors,(char *) colormap);
p=colormap;
if (image->colors <= 256)
for (i=0; i < (long) image->colors; i++)
{
image->colormap[i].red=ScaleCharToQuantum(*p++);
image->colormap[i].green=ScaleCharToQuantum(*p++);
image->colormap[i].blue=ScaleCharToQuantum(*p++);
}
else
for (i=0; i < (long) image->colors; i++)
{
image->colormap[i].red=(*p++ << 8U);
image->colormap[i].red|=(*p++);
image->colormap[i].green=(*p++ << 8U);
image->colormap[i].green|=(*p++);
image->colormap[i].blue=(*p++ << 8U);
image->colormap[i].blue|=(*p++);
}
MagickFreeMemory(colormap);
if (image_info->ping)
{
CloseBlob(image);
return(image);
}
/*
Read image pixels.
*/
packet_size=image->depth > 8 ? 2 : 1;
for (y=0; y < (long) image->rows; y++)
{
p=pixels;
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
indexes=AccessMutableIndexes(image);
(void) ReadBlob(image,packet_size*image->columns,(char *) pixels);
for (x=0; x < (long) image->columns; x++)
{
index=(IndexPacket) (*p++);
VerifyColormapIndex(image,index);
if (image->colors > 256)
{
index=(IndexPacket) ((index << 8)+(*p++));
VerifyColormapIndex(image,index);
}
indexes[x]=index;
*q++=image->colormap[index];
}
if (!SyncImagePixels(image))
break;
}
MagickFreeMemory(pixels);
if (EOFBlob(image))
ThrowException(exception,CorruptImageError,UnexpectedEndOfFile,
image->filename);
CloseBlob(image);
return(image);
}
/*
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% R e g i s t e r M A P I m a g e %
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% Method RegisterMAPImage adds attributes for the MAP 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 RegisterMAPImage method is:
%
% RegisterMAPImage(void)
%
*/
ModuleExport void RegisterMAPImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("MAP");
entry->decoder=(DecoderHandler) ReadMAPImage;
entry->encoder=(EncoderHandler) WriteMAPImage;
entry->adjoin=False;
entry->raw=True;
entry->description="Colormap intensities and indices";
entry->module="MAP";
entry->coder_class=PrimaryCoderClass;
entry->extension_treatment=ObeyExtensionTreatment;
(void) RegisterMagickInfo(entry);
}
/*
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% U n r e g i s t e r M A P I m a g e %
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% Method UnregisterMAPImage removes format registrations made by the
% MAP module from the list of supported formats.
%
% The format of the UnregisterMAPImage method is:
%
% UnregisterMAPImage(void)
%
*/
ModuleExport void UnregisterMAPImage(void)
{
(void) UnregisterMagickInfo("MAP");
}
/*
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% W r i t e M A P I m a g e %
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% Method WriteMAPImage writes an image to a file as red, green, and blue
% colormap bytes followed by the colormap indexes.
%
% The format of the WriteMAPImage method is:
%
% unsigned int WriteMAPImage(const ImageInfo *image_info,Image *image)
%
% A description of each parameter follows.
%
% o status: Method WriteMAPImage 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.
%
%
*/
static unsigned int WriteMAPImage(const ImageInfo *image_info,Image *image)
{
long
y;
register const IndexPacket
*indexes;
register const PixelPacket
*p;
register long
i,
x;
register unsigned char
*q;
unsigned char
*colormap,
*pixels;
unsigned int
status;
unsigned long
packet_size;
/*
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);
(void) TransformColorspace(image,RGBColorspace);
/*
Allocate colormap.
*/
if (!IsPaletteImage(image,&image->exception))
(void) SetImageType(image,PaletteType);
packet_size=image->depth > 8 ? 2 : 1;
pixels=MagickAllocateMemory(unsigned char *,image->columns*packet_size);
packet_size=image->colors > 256 ? 6 : 3;
colormap=MagickAllocateMemory(unsigned char *,packet_size*image->colors);
if ((pixels == (unsigned char *) NULL) ||
(colormap == (unsigned char *) NULL))
ThrowWriterException(ResourceLimitError,MemoryAllocationFailed,image);
/*
Write colormap to file.
*/
q=colormap;
if (image->colors <= 256)
for (i=0; i < (long) image->colors; i++)
{
*q++=image->colormap[i].red;
*q++=image->colormap[i].green;
*q++=image->colormap[i].blue;
}
#if QuantumDepth > 8
else
for (i=0; i < (long) image->colors; i++)
{
*q++=image->colormap[i].red >> 8;
*q++=image->colormap[i].red & 0xff;
*q++=image->colormap[i].green >> 8;
*q++=image->colormap[i].green & 0xff;
*q++=image->colormap[i].blue >> 8;
*q++=image->colormap[i].blue & 0xff;
}
#endif /* QuantumDepth > 8 */
(void) WriteBlob(image,packet_size*image->colors,(char *) colormap);
MagickFreeMemory(colormap);
/*
Write image pixels to file.
*/
for (y=0; y < (long) image->rows; y++)
{
p=AcquireImagePixels(image,0,y,image->columns,1,&image->exception);
if (p == (const PixelPacket *) NULL)
break;
indexes=AccessImmutableIndexes(image);
q=pixels;
for (x=0; x < (long) image->columns; x++)
{
#if QuantumDepth > 8
if (image->colors > 256)
*q++=indexes[x] >> 8;
#endif /* QuantumDepth > 8 */
*q++=indexes[x];
}
(void) WriteBlob(image,q-pixels,(char *) pixels);
}
MagickFreeMemory(pixels);
CloseBlob(image);
return(status);
}