/*
% Copyright (C) 2003-2020 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.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% W W BBBB M M PPPP %
% W W B B MM MM P P %
% W W W BBBB M M M PPPP %
% WW WW B B M M P %
% W W BBBB M M P %
% %
% %
% Read/Write Wireless Bitmap (level 0) Image Format. %
% %
% %
% Software Design %
% John Cristy %
% January 2000 %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/
/*
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
WriteWBMPImage(const ImageInfo *,Image *);
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e a d W B M P I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method ReadWBMPImage reads a WBMP (level 0) image file and returns it. It
% allocates the memory necessary for the new Image structure and returns a
% pointer to the new image.
%
% ReadWBMPImage was contributed by Milan Votava <votava@mageo.cz>.
%
% The format of the ReadWBMPImage method is:
%
% Image *ReadWBMPImage(const ImageInfo *image_info,
% ExceptionInfo *exception)
%
% A description of each parameter follows:
%
% o image: Method ReadWBMPImage 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 unsigned int WBMPReadInteger(Image *image,unsigned long *value)
{
int
byte;
*value=0;
do
{
byte=ReadBlobByte(image);
if (byte == EOF)
return(False);
*value<<=7;
*value|=(unsigned int) (byte & 0x7f);
} while (byte & 0x80);
return(True);
}
static Image *ReadWBMPImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
Image
*image;
int
byte;
long
y;
register IndexPacket
*indexes;
register long
x;
register PixelPacket
*q;
register long
i;
unsigned char
bit;
unsigned int
status;
unsigned short
header;
/*
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 == False)
ThrowReaderException(FileOpenError,UnableToOpenFile,image);
if (ReadBlob(image,2,(char *) &header) != 2)
ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
if (header != 0U)
ThrowReaderException(CoderError,OnlyLevelZerofilesSupported,image);
/*
Initialize image structure.
*/
if (WBMPReadInteger(image,&image->columns) == False)
ThrowReaderException(CorruptImageError,CorruptImage,image);
if (WBMPReadInteger(image,&image->rows) == False)
ThrowReaderException(CorruptImageError,CorruptImage,image);
if ((image->columns == 0) || (image->rows == 0))
ThrowReaderException(CorruptImageError,ImproperImageHeader,image);
for (i=0; i < image->offset; i++)
{
if (EOF == ReadBlobByte(image))
ThrowException(exception,CorruptImageError,UnexpectedEndOfFile,
image->filename);
}
if (!AllocateImageColormap(image,2))
ThrowReaderException(ResourceLimitError,MemoryAllocationFailed,image);
if (image_info->ping)
{
CloseBlob(image);
StopTimer(&image->timer);
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=0;
byte=0;
for (x=0; x < (long) image->columns; x++)
{
if (bit == 0)
{
byte=ReadBlobByte(image);
if (byte == EOF)
ThrowReaderException(CorruptImageError,CorruptImage,image);
}
indexes[x]=(byte & (0x01 << (7-bit))) ? 1 : 0;
bit++;
if (bit == 8)
bit=0;
}
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);
StopTimer(&image->timer);
return(image);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% R e g i s t e r W B M P I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method RegisterWBMPImage adds attributes for the WBMP 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 RegisterWBMPImage method is:
%
% RegisterWBMPImage(void)
%
*/
ModuleExport void RegisterWBMPImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("WBMP");
entry->decoder=(DecoderHandler) ReadWBMPImage;
entry->encoder=(EncoderHandler) WriteWBMPImage;
entry->adjoin=False;
entry->description="Wireless Bitmap (level 0) image";
entry->module="WBMP";
(void) RegisterMagickInfo(entry);
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% U n r e g i s t e r W B M P I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method UnregisterWBMPImage removes format registrations made by the
% WBMP module from the list of supported formats.
%
% The format of the UnregisterWBMPImage method is:
%
% UnregisterWBMPImage(void)
%
*/
ModuleExport void UnregisterWBMPImage(void)
{
(void) UnregisterMagickInfo("WBMP");
}
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% %
% %
% W r i t e W B M P I m a g e %
% %
% %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Method WriteWBMPImage writes an image to a file in the Wireless Bitmap
% (level 0) image format.
%
% WriteWBMPImage was contributed by Milan Votava <votava@mageo.cz>.
%
% The format of the WriteWBMPImage method is:
%
% unsigned int WriteWBMPImage(const ImageInfo *image_info,Image *image)
%
% A description of each parameter follows.
%
% o status: Method WriteWBMPImage 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 void WBMPWriteInteger(Image *image,const unsigned long value)
{
int
bits,
flag,
n;
register long
i;
unsigned char
buffer[5],
octet;
n=1;
bits=28;
flag=False;
for(i=4; i >= 0; i--)
{
octet=(unsigned char) ((value >> bits) & 0x7f);
if (!flag && octet)
{
flag=True;
n=i+1;
}
buffer[4-i]=octet | (i && (flag || octet))*(0x01 << 7);
bits-=7;
}
(void) WriteBlob(image,n,(char *) buffer+5-n);
}
static unsigned int WriteWBMPImage(const ImageInfo *image_info,Image *image)
{
long
y;
register const PixelPacket
*p;
register const IndexPacket
*indexes;
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]);
(void) WriteBlobMSBShort(image,0);
WBMPWriteInteger(image,image->columns);
WBMPWriteInteger(image,image->rows);
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++)
{
if (indexes[x] == polarity)
byte|=0x1 << (7-bit);
bit++;
if (bit == 8)
{
(void) WriteBlobByte(image,byte);
bit=0;
byte=0;
}
}
if (bit != 0)
(void) WriteBlobByte(image,byte);
if (QuantumTick(y,image->rows))
if (!MagickMonitorFormatted(y,image->rows,&image->exception,
SaveImageText,image->filename,
image->columns,image->rows))
break;
}
status &= CloseBlob(image);
return(status);
}
