forked from openkylin/imagemagick
463 lines
16 KiB
C
463 lines
16 KiB
C
/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% M M AAA PPPP %
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% MM MM A A P P %
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% M M M AAAAA PPPP %
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% M M A A P %
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% M M A A P %
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% %
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% %
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% Read/Write Image Colormaps as an Image File. %
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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.h"
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#include "magick/color-private.h"
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#include "magick/colormap.h"
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#include "magick/colormap-private.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/histogram.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/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/statistic.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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WriteMAPImage(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 A 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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% ReadMAPImage() reads an image of raw RGB colormap and colormap index
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% bytes and returns it. It allocates the memory necessary for the new Image
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% structure and returns a pointer to the new image.
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%
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% The format of the ReadMAPImage method is:
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%
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% Image *ReadMAPImage(const ImageInfo *image_info,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 *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
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{
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Image
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*image;
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IndexPacket
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index;
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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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i;
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unsigned char
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*p;
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size_t
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depth,
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packet_size,
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quantum;
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ssize_t
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count,
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y;
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unsigned char
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*colormap,
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*pixels;
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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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/*
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Initialize image structure.
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*/
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image->storage_class=PseudoClass;
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status=AcquireImageColormap(image,(size_t)
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(image->offset != 0 ? image->offset : 256));
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if (status == MagickFalse)
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ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
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depth=GetImageQuantumDepth(image,MagickTrue);
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packet_size=(size_t) (depth/8);
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pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
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sizeof(*pixels));
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packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
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colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
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sizeof(*colormap));
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if ((pixels == (unsigned char *) NULL) ||
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(colormap == (unsigned char *) NULL))
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{
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pixels=(unsigned char *) RelinquishMagickMemory(pixels);
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colormap=(unsigned char *) RelinquishMagickMemory(colormap);
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ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
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}
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/*
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Read image colormap.
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*/
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count=ReadBlob(image,packet_size*image->colors,colormap);
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if (count != (ssize_t) (packet_size*image->colors))
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{
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pixels=(unsigned char *) RelinquishMagickMemory(pixels);
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colormap=(unsigned char *) RelinquishMagickMemory(colormap);
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ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
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}
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p=colormap;
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if (image->depth <= 8)
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for (i=0; i < (ssize_t) image->colors; i++)
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{
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image->colormap[i].red=ScaleCharToQuantum(*p++);
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image->colormap[i].green=ScaleCharToQuantum(*p++);
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image->colormap[i].blue=ScaleCharToQuantum(*p++);
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}
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else
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for (i=0; i < (ssize_t) image->colors; i++)
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{
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quantum=(*p++ << 8);
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quantum|=(*p++);
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image->colormap[i].red=(Quantum) quantum;
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quantum=(*p++ << 8);
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quantum|=(*p++);
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image->colormap[i].green=(Quantum) quantum;
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quantum=(*p++ << 8);
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quantum|=(*p++);
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image->colormap[i].blue=(Quantum) quantum;
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}
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colormap=(unsigned char *) RelinquishMagickMemory(colormap);
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if (image_info->ping != MagickFalse)
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{
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(void) CloseBlob(image);
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pixels=(unsigned char *) RelinquishMagickMemory(pixels);
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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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pixels=(unsigned char *) RelinquishMagickMemory(pixels);
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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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Read image pixels.
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*/
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packet_size=(size_t) (depth/8);
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for (y=0; y < (ssize_t) image->rows; y++)
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{
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p=pixels;
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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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count=ReadBlob(image,(size_t) packet_size*image->columns,pixels);
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if (count != (ssize_t) (packet_size*image->columns))
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break;
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for (x=0; x < (ssize_t) image->columns; x++)
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{
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index=ConstrainColormapIndex(image,*p);
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p++;
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if (image->colors > 256)
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{
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index=ConstrainColormapIndex(image,((size_t) index << 8)+(*p));
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p++;
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}
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SetPixelIndex(indexes+x,index);
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SetPixelRGBO(q,image->colormap+(ssize_t) index);
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}
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if (SyncAuthenticPixels(image,exception) == MagickFalse)
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break;
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}
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pixels=(unsigned char *) RelinquishMagickMemory(pixels);
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if (y < (ssize_t) image->rows)
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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 A 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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% RegisterMAPImage() adds attributes for the MAP 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 RegisterMAPImage method is:
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%
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% size_t RegisterMAPImage(void)
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%
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*/
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ModuleExport size_t RegisterMAPImage(void)
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{
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MagickInfo
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*entry;
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entry=SetMagickInfo("MAP");
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entry->decoder=(DecodeImageHandler *) ReadMAPImage;
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entry->encoder=(EncodeImageHandler *) WriteMAPImage;
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entry->adjoin=MagickFalse;
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entry->format_type=ExplicitFormatType;
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entry->raw=MagickTrue;
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entry->endian_support=MagickTrue;
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entry->description=ConstantString("Colormap intensities and indices");
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entry->magick_module=ConstantString("MAP");
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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 A 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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% UnregisterMAPImage() removes format registrations made by the
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% MAP module from the list of supported formats.
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%
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% The format of the UnregisterMAPImage method is:
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%
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% UnregisterMAPImage(void)
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%
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*/
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ModuleExport void UnregisterMAPImage(void)
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{
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(void) UnregisterMagickInfo("MAP");
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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 A 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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% WriteMAPImage() writes an image to a file as red, green, and blue
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% colormap bytes followed by the colormap indexes.
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%
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% The format of the WriteMAPImage method is:
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%
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% MagickBooleanType WriteMAPImage(const ImageInfo *image_info,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 MagickBooleanType WriteMAPImage(const ImageInfo *image_info,Image *image)
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{
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MagickBooleanType
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status;
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const IndexPacket
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*indexes;
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const PixelPacket
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*p;
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ssize_t
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i,
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x;
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unsigned char
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*q;
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size_t
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depth,
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packet_size;
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ssize_t
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y;
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unsigned char
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*colormap,
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*pixels;
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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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Allocate colormap.
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*/
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if (SetImageType(image,PaletteType) == MagickFalse)
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ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
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depth=GetImageQuantumDepth(image,MagickTrue);
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packet_size=(size_t) (depth/8);
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pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
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sizeof(*pixels));
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packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
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colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
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sizeof(*colormap));
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if ((pixels == (unsigned char *) NULL) ||
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(colormap == (unsigned char *) NULL))
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{
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if (colormap != (unsigned char *) NULL)
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colormap=(unsigned char *) RelinquishMagickMemory(colormap);
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if (pixels != (unsigned char *) NULL)
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pixels=(unsigned char *) RelinquishMagickMemory(pixels);
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ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
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}
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/*
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Write colormap to file.
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*/
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q=colormap;
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if (image->colors <= 256)
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for (i=0; i < (ssize_t) image->colors; i++)
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{
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*q++=(unsigned char) ScaleQuantumToChar(image->colormap[i].red);
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*q++=(unsigned char) ScaleQuantumToChar(image->colormap[i].green);
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*q++=(unsigned char) ScaleQuantumToChar(image->colormap[i].blue);
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}
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else
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for (i=0; i < (ssize_t) image->colors; i++)
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{
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*q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].red) >> 8);
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*q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].red) & 0xff);
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*q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].green) >> 8);
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*q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].green) &
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0xff);
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*q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].blue) >> 8);
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*q++=(unsigned char) (ScaleQuantumToShort(image->colormap[i].blue) &
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0xff);
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}
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(void) WriteBlob(image,packet_size*image->colors,colormap);
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colormap=(unsigned char *) RelinquishMagickMemory(colormap);
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/*
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Write image pixels to file.
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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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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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indexes=GetVirtualIndexQueue(image);
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q=pixels;
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for (x=0; x < (ssize_t) image->columns; x++)
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{
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if (image->colors > 256)
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*q++=(unsigned char) ((size_t) GetPixelIndex(indexes+x) >> 8);
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*q++=(unsigned char) ((size_t) GetPixelIndex(indexes+x));
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}
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(void) WriteBlob(image,(size_t) (q-pixels),pixels);
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}
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pixels=(unsigned char *) RelinquishMagickMemory(pixels);
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(void) CloseBlob(image);
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return(status);
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}
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