forked from openkylin/imagemagick
364 lines
13 KiB
C
364 lines
13 KiB
C
/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% M M OOO N N OOO %
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% MM MM O O NN N O O %
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% M M M O O N N N O O %
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% M M O O N NN O O %
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% M M OOO N N OOO %
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% %
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% %
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% Read/Write Raw Bi-Level Bitmap Format %
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% %
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% Software Design %
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% Cristy %
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% July 1992 %
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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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WriteMONOImage(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 M O N O 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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% ReadMONOImage() reads an image of raw bites in LSB order and returns
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% it. It allocates the memory necessary for the new Image structure and
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% returns a pointer to the new image.
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%
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% The format of the ReadMONOImage method is:
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%
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% Image *ReadMONOImage(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 Image *ReadMONOImage(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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MagickBooleanType
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status;
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IndexPacket
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*indexes;
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PixelPacket
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*q;
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ssize_t
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x;
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size_t
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bit,
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byte;
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ssize_t
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y;
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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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if ((image->columns == 0) || (image->rows == 0))
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ThrowReaderException(OptionError,"MustSpecifyImageSize");
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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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if (DiscardBlobBytes(image,image->offset) == MagickFalse)
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ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
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image->filename);
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/*
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Initialize image colormap.
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*/
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image->depth=1;
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if (AcquireImageColormap(image,2) == MagickFalse)
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ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
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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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/*
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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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byte=(size_t) ReadBlobByte(image);
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if (image_info->endian == LSBEndian)
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SetPixelIndex(indexes+x,((byte & 0x01) != 0) ? 0x00 : 0x01);
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else
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SetPixelIndex(indexes+x,((byte & 0x01) != 0) ? 0x01 : 0x00);
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bit++;
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if (bit == 8)
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bit=0;
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byte>>=1;
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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 M O N O 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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% RegisterMONOImage() adds attributes for the MONO 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 RegisterMONOImage method is:
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%
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% size_t RegisterMONOImage(void)
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%
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*/
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ModuleExport size_t RegisterMONOImage(void)
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{
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MagickInfo
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*entry;
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entry=SetMagickInfo("MONO");
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entry->decoder=(DecodeImageHandler *) ReadMONOImage;
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entry->encoder=(EncodeImageHandler *) WriteMONOImage;
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entry->raw=MagickTrue;
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entry->endian_support=MagickTrue;
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entry->adjoin=MagickFalse;
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entry->description=ConstantString("Raw bi-level bitmap");
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entry->magick_module=ConstantString("MONO");
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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 M O N O 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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% UnregisterMONOImage() removes format registrations made by the
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% MONO module from the list of supported formats.
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%
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% The format of the UnregisterMONOImage method is:
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%
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% UnregisterMONOImage(void)
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%
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*/
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ModuleExport void UnregisterMONOImage(void)
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{
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(void) UnregisterMagickInfo("MONO");
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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 M O N O 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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% WriteMONOImage() writes an image of raw bits in LSB order to a file.
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%
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% The format of the WriteMONOImage method is:
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%
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% MagickBooleanType WriteMONOImage(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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static MagickBooleanType WriteMONOImage(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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size_t
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bit,
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byte;
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ssize_t
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y;
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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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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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byte>>=1;
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if (image->endian == LSBEndian)
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{
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if (GetPixelLuma(image,p) < (QuantumRange/2.0))
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byte|=0x80;
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}
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else
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if (GetPixelLuma(image,p) >= (QuantumRange/2.0))
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byte|=0x80;
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bit++;
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if (bit == 8)
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{
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(void) WriteBlobByte(image,(unsigned char) 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,(unsigned char) (byte >> (8-bit)));
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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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