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DEFINITIONS
This source file includes following definitions.
- WBMPReadInteger
- ReadWBMPImage
- RegisterWBMPImage
- UnregisterWBMPImage
- WBMPWriteInteger
- WriteWBMPImage
/*
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% Read/Write Wireless Bitmap (level 0) Image Format %
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% Software Design %
% John Cristy %
% January 2000 %
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% Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization %
% dedicated to making software imaging solutions freely available. %
% %
% You may not use this file except in compliance with the License. You may %
% obtain a copy of the License at %
% %
% http://www.imagemagick.org/script/license.php %
% %
% Unless required by applicable law or agreed to in writing, software %
% distributed under the License is distributed on an "AS IS" BASIS, %
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
% See the License for the specific language governing permissions and %
% limitations under the License. %
% %
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*/
/*
Include declarations.
*/
#include "magick/studio.h"
#include "magick/attribute.h"
#include "magick/blob.h"
#include "magick/blob-private.h"
#include "magick/cache.h"
#include "magick/color-private.h"
#include "magick/colormap.h"
#include "magick/colorspace.h"
#include "magick/colorspace-private.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/image.h"
#include "magick/image-private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/monitor.h"
#include "magick/monitor-private.h"
#include "magick/pixel-accessor.h"
#include "magick/quantum-private.h"
#include "magick/static.h"
#include "magick/string_.h"
#include "magick/module.h"
/*
Forward declarations.
*/
static MagickBooleanType
WriteWBMPImage(const ImageInfo *,Image *);
/*
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% 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_info: the image info.
%
% o exception: return any errors or warnings in this structure.
%
*/
static MagickBooleanType WBMPReadInteger(Image *image,size_t *value)
{
int
byte;
*value=0;
do
{
byte=ReadBlobByte(image);
if (byte == EOF)
return(MagickFalse);
*value<<=7;
*value|=(unsigned int) (byte & 0x7f);
} while (byte & 0x80);
return(MagickTrue);
}
static Image *ReadWBMPImage(const ImageInfo *image_info,
ExceptionInfo *exception)
{
Image
*image;
int
byte;
MagickBooleanType
status;
register IndexPacket
*indexes;
register ssize_t
x;
register PixelPacket
*q;
ssize_t
y;
unsigned char
bit;
unsigned short
header;
/*
Open image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
if (image_info->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
image_info->filename);
assert(exception != (ExceptionInfo *) NULL);
assert(exception->signature == MagickSignature);
image=AcquireImage(image_info);
status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
if (status == MagickFalse)
{
image=DestroyImageList(image);
return((Image *) NULL);
}
if (ReadBlob(image,2,(unsigned char *) &header) == 0)
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
if (header != 0)
ThrowReaderException(CoderError,"OnlyLevelZerofilesSupported");
/*
Initialize image structure.
*/
if (WBMPReadInteger(image,&image->columns) == MagickFalse)
ThrowReaderException(CorruptImageError,"CorruptWBMPimage");
if (WBMPReadInteger(image,&image->rows) == MagickFalse)
ThrowReaderException(CorruptImageError,"CorruptWBMPimage");
if ((image->columns == 0) || (image->rows == 0))
ThrowReaderException(CorruptImageError,"ImproperImageHeader");
if (DiscardBlobBytes(image,image->offset) == MagickFalse)
ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
image->filename);
if (AcquireImageColormap(image,2) == MagickFalse)
ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
if (image_info->ping != MagickFalse)
{
(void) CloseBlob(image);
return(GetFirstImageInList(image));
}
/*
Convert bi-level image to pixel packets.
*/
for (y=0; y < (ssize_t) image->rows; y++)
{
q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
if (q == (PixelPacket *) NULL)
break;
indexes=GetAuthenticIndexQueue(image);
bit=0;
byte=0;
for (x=0; x < (ssize_t) image->columns; x++)
{
if (bit == 0)
{
byte=ReadBlobByte(image);
if (byte == EOF)
ThrowReaderException(CorruptImageError,"CorruptImage");
}
SetPixelIndex(indexes+x,(byte & (0x01 << (7-bit))) ? 1 : 0);
bit++;
if (bit == 8)
bit=0;
}
if (SyncAuthenticPixels(image,exception) == MagickFalse)
break;
status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
(void) SyncImage(image);
if (EOFBlob(image) != MagickFalse)
ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
image->filename);
(void) CloseBlob(image);
return(GetFirstImageInList(image));
}
/*
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% R e g i s t e r W B M P I m a g e %
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% 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:
%
% size_t RegisterWBMPImage(void)
%
*/
ModuleExport size_t RegisterWBMPImage(void)
{
MagickInfo
*entry;
entry=SetMagickInfo("WBMP");
entry->decoder=(DecodeImageHandler *) ReadWBMPImage;
entry->encoder=(EncodeImageHandler *) WriteWBMPImage;
entry->adjoin=MagickFalse;
entry->description=ConstantString("Wireless Bitmap (level 0) image");
entry->module=ConstantString("WBMP");
(void) RegisterMagickInfo(entry);
return(MagickImageCoderSignature);
}
/*
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% U n r e g i s t e r W B M P I m a g e %
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% 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");
}
/*
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% W r i t e W B M P I m a g e %
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% 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:
%
% MagickBooleanType WriteWBMPImage(const ImageInfo *image_info,
% Image *image)
%
% A description of each parameter follows.
%
% o image_info: the image info.
%
% o image: The image.
%
%
*/
static void WBMPWriteInteger(Image *image,const size_t value)
{
int
bits,
flag,
n;
register ssize_t
i;
unsigned char
buffer[5],
octet;
n=1;
bits=28;
flag=MagickFalse;
for (i=4; i >= 0; i--)
{
octet=(unsigned char) ((value >> bits) & 0x7f);
if ((flag == 0) && (octet != 0))
{
flag=MagickTrue;
n=i+1;
}
buffer[4-i]=octet | (i && (flag || octet))*(0x01 << 7);
bits-=7;
}
(void) WriteBlob(image,(size_t) n,buffer+5-n);
}
static MagickBooleanType WriteWBMPImage(const ImageInfo *image_info,
Image *image)
{
MagickBooleanType
status;
register const PixelPacket
*p;
register ssize_t
x;
ssize_t
y;
unsigned char
bit,
byte;
/*
Open output image file.
*/
assert(image_info != (const ImageInfo *) NULL);
assert(image_info->signature == MagickSignature);
assert(image != (Image *) NULL);
assert(image->signature == MagickSignature);
if (image->debug != MagickFalse)
(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
if (status == MagickFalse)
return(status);
if (IssRGBCompatibleColorspace(image->colorspace) == MagickFalse)
(void) TransformImageColorspace(image,sRGBColorspace);
/*
Convert image to a bi-level image.
*/
(void) SetImageType(image,BilevelType);
(void) WriteBlobMSBShort(image,0);
WBMPWriteInteger(image,image->columns);
WBMPWriteInteger(image,image->rows);
for (y=0; y < (ssize_t) image->rows; y++)
{
p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
if (p == (const PixelPacket *) NULL)
break;
bit=0;
byte=0;
for (x=0; x < (ssize_t) image->columns; x++)
{
if (GetPixelLuma(image,p) >= (QuantumRange/2.0))
byte|=0x1 << (7-bit);
bit++;
if (bit == 8)
{
(void) WriteBlobByte(image,byte);
bit=0;
byte=0;
}
p++;
}
if (bit != 0)
(void) WriteBlobByte(image,byte);
status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
image->rows);
if (status == MagickFalse)
break;
}
(void) CloseBlob(image);
return(MagickTrue);
}