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DEFINITIONS
This source file includes following definitions.
- ReadMONOImage
- RegisterMONOImage
- UnregisterMONOImage
- WriteMONOImage
/*
% 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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% %
% %
% %
% M M OOO N N OOO %
% MM MM O O NN N O O %
% M M M O O N N N O O %
% M M O O N NN O O %
% M M OOO N N OOO %
% %
% %
% Read/Write Raw Bi-Level Bitmap 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"
/*
Forward declarations.
*/
static unsigned int
WriteMONOImage(const ImageInfo *,Image *);
/*
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% %
% %
% %
% R e a d M O N O I m a g e %
% %
% %
% %
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%
% Method ReadMONOImage reads an image of raw bytes in LSB order 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 ReadMONOImage method is:
%
% Image *ReadMONOImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadMONOImage 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 *ReadMONOImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
Image
*image;
long
y;
register IndexPacket
*indexes;
register long
x;
register PixelPacket
*q;
register long
i;
unsigned char
bit,
byte;
unsigned int
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);
for (i=0; i < image->offset; i++)
{
if (EOF == ReadBlobByte(image))
ThrowException(exception,CorruptImageError,UnexpectedEndOfFile,
image->filename);
}
/*
Initialize image colormap.
*/
if (!AllocateImageColormap(image,2))
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
if (image_info->ping)
{
CloseBlob(image);
return(image);
}
/*
Convert bi-level image to pixel packets.
*/
for (y=0; y < (long) image->rows; y++)
{
q=SetImagePixels(image,0,y,image->columns,1);
if (q == (PixelPacket *) NULL)
break;
indexes=AccessMutableIndexes(image);
bit=0U;
byte=0U;
for (x=0; x < (long) image->columns; x++)
{
if (bit == 0U)
byte=ReadBlobByte(image);
indexes[x]=(byte & 0x01U) ? 0x01U : 0x00U;
bit++;
if (bit == 8U)
bit=0U;
byte>>=1U;
}
if (!SyncImagePixels(image))
break;
if (QuantumTick(y,image->rows))
if (!MagickMonitorFormatted(y,image->rows,exception,LoadImageText,
image->filename,
image->columns,image->rows))
break;
}
(void) SyncImage(image);
if (EOFBlob(image))
ThrowException(exception,CorruptImageError,UnexpectedEndOfFile,
image->filename);
CloseBlob(image);
return(image);
}
/*
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% %
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% R e g i s t e r M O N O I m a g e %
% %
% %
% %
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%
% Method RegisterMONOImage adds attributes for the MONO 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 RegisterMONOImage method is:
%
% RegisterMONOImage(void)
%
*/
ModuleExport void RegisterMONOImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("MONO");
entry->decoder=(DecoderHandler) ReadMONOImage;
entry->encoder=(EncoderHandler) WriteMONOImage;
entry->adjoin=False;
entry->description="Bi-level bitmap in least-significant-byte first order";
entry->raw=True;
entry->module="MONO";
(void) RegisterMagickInfo(entry);
}
/*
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% U n r e g i s t e r M O N O I m a g e %
% %
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% %
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%
% Method UnregisterMONOImage removes format registrations made by the
% MONO module from the list of supported formats.
%
% The format of the UnregisterMONOImage method is:
%
% UnregisterMONOImage(void)
%
*/
ModuleExport void UnregisterMONOImage(void)
{
(void) UnregisterMagickInfo("MONO");
}
/*
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% %
% %
% %
% W r i t e M O N O I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method WriteMONOImage writes an image of raw bits in LSB order to a file.
%
% The format of the WriteMONOImage method is:
%
% unsigned int WriteMONOImage(const ImageInfo *image_info,Image *image)
%
% A description of each parameter follows.
%
% o status: Method WriteMONOImage 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 WriteMONOImage(const ImageInfo *image_info,Image *image)
{
long
y;
register const IndexPacket
*indexes;
register const PixelPacket
*p;
register long
x;
unsigned char
bit,
byte,
polarity;
unsigned int
status;
/*
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);
/*
Convert image to a bi-level image.
*/
(void) SetImageType(image,BilevelType);
polarity=PixelIntensityToQuantum(&image->colormap[0]) < (MaxRGB/2);
if (image->colors == 2)
polarity=PixelIntensityToQuantum(&image->colormap[0]) <
PixelIntensityToQuantum(&image->colormap[1]);
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);
bit=0;
byte=0;
for (x=0; x < (long) image->columns; x++)
{
byte>>=1;
if (indexes[x] == polarity)
byte|=0x80;
bit++;
if (bit == 8)
{
(void) WriteBlobByte(image,byte);
bit=0;
byte=0;
}
}
if (bit != 0)
(void) WriteBlobByte(image,byte >> (8-bit));
if (QuantumTick(y,image->rows))
if (!MagickMonitorFormatted(y,image->rows,&image->exception,
SaveImageText,image->filename,
image->columns,image->rows))
break;
}
CloseBlob(image);
return(True);
}