forked from openkylin/imagemagick
427 lines
14 KiB
C
427 lines
14 KiB
C
/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% W W BBBB M M PPPP %
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% W W B B MM MM P P %
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% W W W BBBB M M M PPPP %
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% WW WW B B M M P %
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% W W BBBB M M P %
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% %
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% %
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% Read/Write Wireless Bitmap (level 0) Image Format %
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% %
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% Software Design %
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% Cristy %
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% January 2000 %
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% %
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% %
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% Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization %
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% dedicated to making software imaging solutions freely available. %
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% %
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% You may not use this file except in compliance with the License. You may %
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% obtain a copy of the License at %
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% %
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% https://imagemagick.org/script/license.php %
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% %
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% Unless required by applicable law or agreed to in writing, software %
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% distributed under the License is distributed on an "AS IS" BASIS, %
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. %
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% See the License for the specific language governing permissions and %
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% limitations under the License. %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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%
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*/
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/*
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Include declarations.
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*/
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#include "magick/studio.h"
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#include "magick/attribute.h"
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#include "magick/blob.h"
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#include "magick/blob-private.h"
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#include "magick/cache.h"
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#include "magick/color-private.h"
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#include "magick/colormap.h"
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#include "magick/colorspace.h"
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#include "magick/colorspace-private.h"
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#include "magick/exception.h"
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#include "magick/exception-private.h"
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#include "magick/image.h"
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#include "magick/image-private.h"
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#include "magick/list.h"
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#include "magick/magick.h"
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#include "magick/memory_.h"
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#include "magick/monitor.h"
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#include "magick/monitor-private.h"
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#include "magick/pixel-accessor.h"
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#include "magick/quantum-private.h"
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#include "magick/static.h"
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#include "magick/string_.h"
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#include "magick/module.h"
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/*
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Forward declarations.
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*/
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static MagickBooleanType
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WriteWBMPImage(const ImageInfo *,Image *);
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% R e a d W B M P I m a g e %
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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% ReadWBMPImage() reads a WBMP (level 0) image file and returns it. It
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% allocates the memory necessary for the new Image structure and returns a
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% pointer to the new image.
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%
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% ReadWBMPImage was contributed by Milan Votava <votava@mageo.cz>.
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%
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% The format of the ReadWBMPImage method is:
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%
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% Image *ReadWBMPImage(const ImageInfo *image_info,
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% ExceptionInfo *exception)
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%
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% A description of each parameter follows:
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%
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% o image_info: the image info.
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%
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% o exception: return any errors or warnings in this structure.
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%
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*/
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static MagickBooleanType WBMPReadInteger(Image *image,size_t *value)
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{
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int
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byte;
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*value=0;
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do
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{
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byte=ReadBlobByte(image);
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if (byte == EOF)
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return(MagickFalse);
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*value<<=7;
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*value|=(unsigned int) (byte & 0x7f);
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} while (byte & 0x80);
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return(MagickTrue);
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}
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static Image *ReadWBMPImage(const ImageInfo *image_info,
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ExceptionInfo *exception)
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{
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Image
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*image;
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int
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byte;
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MagickBooleanType
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status;
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IndexPacket
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*indexes;
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ssize_t
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x;
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PixelPacket
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*q;
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ssize_t
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y;
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unsigned char
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bit;
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unsigned short
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header;
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/*
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Open image file.
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*/
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assert(image_info != (const ImageInfo *) NULL);
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assert(image_info->signature == MagickCoreSignature);
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if (image_info->debug != MagickFalse)
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(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
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image_info->filename);
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assert(exception != (ExceptionInfo *) NULL);
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assert(exception->signature == MagickCoreSignature);
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image=AcquireImage(image_info);
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status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
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if (status == MagickFalse)
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{
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image=DestroyImageList(image);
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return((Image *) NULL);
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}
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header=0;
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if (ReadBlob(image,2,(unsigned char *) &header) != 2)
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ThrowReaderException(CorruptImageError,"ImproperImageHeader");
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if (header != 0)
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ThrowReaderException(CoderError,"OnlyLevelZerofilesSupported");
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/*
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Initialize image structure.
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*/
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if (WBMPReadInteger(image,&image->columns) == MagickFalse)
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ThrowReaderException(CorruptImageError,"CorruptWBMPimage");
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if (WBMPReadInteger(image,&image->rows) == MagickFalse)
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ThrowReaderException(CorruptImageError,"CorruptWBMPimage");
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if ((image->columns == 0) || (image->rows == 0))
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ThrowReaderException(CorruptImageError,"ImproperImageHeader");
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if (DiscardBlobBytes(image,image->offset) == MagickFalse)
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ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
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image->filename);
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if (image_info->ping != MagickFalse)
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{
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(void) CloseBlob(image);
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return(GetFirstImageInList(image));
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}
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status=SetImageExtent(image,image->columns,image->rows);
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if (status == MagickFalse)
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{
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InheritException(exception,&image->exception);
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return(DestroyImageList(image));
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}
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(void) SetImageBackgroundColor(image);
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if (AcquireImageColormap(image,2) == MagickFalse)
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ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
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/*
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Convert bi-level image to pixel packets.
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*/
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for (y=0; y < (ssize_t) image->rows; y++)
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{
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q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
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if (q == (PixelPacket *) NULL)
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break;
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indexes=GetAuthenticIndexQueue(image);
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bit=0;
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byte=0;
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for (x=0; x < (ssize_t) image->columns; x++)
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{
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if (bit == 0)
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{
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byte=ReadBlobByte(image);
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if (byte == EOF)
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ThrowReaderException(CorruptImageError,"CorruptImage");
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}
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SetPixelIndex(indexes+x,(byte & (0x01 << (7-bit))) ? 1 : 0);
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bit++;
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if (bit == 8)
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bit=0;
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}
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if (SyncAuthenticPixels(image,exception) == MagickFalse)
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break;
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status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
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image->rows);
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if (status == MagickFalse)
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break;
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}
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(void) SyncImage(image);
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if (EOFBlob(image) != MagickFalse)
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ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
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image->filename);
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(void) CloseBlob(image);
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return(GetFirstImageInList(image));
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}
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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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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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% RegisterWBMPImage() adds attributes for the WBMP image format to
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% the list of supported formats. The attributes include the image format
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% tag, a method to read and/or write the format, whether the format
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% supports the saving of more than one frame to the same file or blob,
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% whether the format supports native in-memory I/O, and a brief
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% description of the format.
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%
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% The format of the RegisterWBMPImage method is:
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%
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% size_t RegisterWBMPImage(void)
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%
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*/
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ModuleExport size_t RegisterWBMPImage(void)
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{
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MagickInfo
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*entry;
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entry=SetMagickInfo("WBMP");
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entry->decoder=(DecodeImageHandler *) ReadWBMPImage;
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entry->encoder=(EncodeImageHandler *) WriteWBMPImage;
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entry->adjoin=MagickFalse;
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entry->description=ConstantString("Wireless Bitmap (level 0) image");
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entry->magick_module=ConstantString("WBMP");
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(void) RegisterMagickInfo(entry);
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return(MagickImageCoderSignature);
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}
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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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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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% UnregisterWBMPImage() removes format registrations made by the
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% WBMP module from the list of supported formats.
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%
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% The format of the UnregisterWBMPImage method is:
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%
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% UnregisterWBMPImage(void)
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%
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*/
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ModuleExport void UnregisterWBMPImage(void)
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{
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(void) UnregisterMagickInfo("WBMP");
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}
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/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% W r i t e W B M P I m a g e %
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% %
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% %
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% %
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% WriteWBMPImage() writes an image to a file in the Wireless Bitmap
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% (level 0) image format.
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%
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% WriteWBMPImage was contributed by Milan Votava <votava@mageo.cz>.
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%
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% The format of the WriteWBMPImage method is:
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%
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% MagickBooleanType WriteWBMPImage(const ImageInfo *image_info,
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% Image *image)
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%
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% A description of each parameter follows.
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%
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% o image_info: the image info.
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%
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% o image: The image.
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%
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%
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*/
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static void WBMPWriteInteger(Image *image,const size_t value)
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{
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int
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bits,
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flag,
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n;
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ssize_t
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i;
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unsigned char
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buffer[5],
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octet;
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n=1;
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bits=28;
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flag=MagickFalse;
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for (i=4; i >= 0; i--)
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{
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octet=(unsigned char) ((value >> bits) & 0x7f);
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if ((flag == 0) && (octet != 0))
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{
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flag=MagickTrue;
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n=i+1;
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}
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buffer[4-i]=octet | (i && (flag || octet))*(0x01 << 7);
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bits-=7;
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}
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(void) WriteBlob(image,(size_t) n,buffer+5-n);
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}
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static MagickBooleanType WriteWBMPImage(const ImageInfo *image_info,
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Image *image)
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{
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MagickBooleanType
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status;
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const PixelPacket
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*p;
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ssize_t
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x;
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ssize_t
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y;
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unsigned char
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bit,
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byte;
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/*
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Open output image file.
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*/
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assert(image_info != (const ImageInfo *) NULL);
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assert(image_info->signature == MagickCoreSignature);
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assert(image != (Image *) NULL);
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assert(image->signature == MagickCoreSignature);
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if (image->debug != MagickFalse)
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(void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
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status=OpenBlob(image_info,image,WriteBinaryBlobMode,&image->exception);
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if (status == MagickFalse)
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return(status);
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(void) TransformImageColorspace(image,sRGBColorspace);
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/*
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Convert image to a bi-level image.
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*/
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(void) SetImageType(image,BilevelType);
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(void) WriteBlobMSBShort(image,0);
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WBMPWriteInteger(image,image->columns);
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WBMPWriteInteger(image,image->rows);
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for (y=0; y < (ssize_t) image->rows; y++)
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{
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p=GetVirtualPixels(image,0,y,image->columns,1,&image->exception);
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if (p == (const PixelPacket *) NULL)
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break;
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bit=0;
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byte=0;
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for (x=0; x < (ssize_t) image->columns; x++)
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{
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if (GetPixelLuma(image,p) >= (QuantumRange/2.0))
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byte|=0x1 << (7-bit);
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bit++;
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if (bit == 8)
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{
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(void) WriteBlobByte(image,byte);
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bit=0;
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byte=0;
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}
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p++;
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}
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if (bit != 0)
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(void) WriteBlobByte(image,byte);
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status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
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image->rows);
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if (status == MagickFalse)
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break;
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}
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(void) CloseBlob(image);
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return(MagickTrue);
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}
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