forked from openkylin/imagemagick
315 lines
11 KiB
C
315 lines
11 KiB
C
/*
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% SSSSS CCCC RRRR %
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% SS C R R %
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% SSS C RRRR %
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% SS C R R %
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% SSSSS CCCC R R %
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% %
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% %
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% Read ZX-Spectrum SCREEN$ Format %
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% %
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% Software Design %
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% Catalin Mihaila %
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% October 2003 %
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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/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/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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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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% %
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% %
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% %
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% R e a d S C R 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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% ReadSCRImage() reads a Scitex image file and returns it. It allocates
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% the memory necessary for the new Image structure and returns a pointer to
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% the new image.
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%
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% The format of the ReadSCRImage method is:
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%
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% Image *ReadSCRImage(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 *ReadSCRImage(const ImageInfo *image_info,ExceptionInfo *exception)
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{
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char zxscr[6144];
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char zxattr[768];
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int octetnr;
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int octetline;
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int zoneline;
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int zonenr;
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int octet_val;
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int attr_nr;
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int pix;
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int piy;
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int binar[8];
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int attrbin[8];
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int *pbin;
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int *abin;
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int z;
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int one_nr;
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int ink;
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int paper;
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int bright;
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unsigned char colour_palette[] = {
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0, 0, 0,
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0, 0,192,
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192, 0, 0,
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192, 0,192,
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0,192, 0,
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0,192,192,
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192,192, 0,
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192,192,192,
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0, 0, 0,
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0, 0,255,
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255, 0, 0,
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255, 0,255,
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0,255, 0,
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0,255,255,
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255,255, 0,
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255,255,255
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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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PixelPacket
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*q;
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ssize_t
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count;
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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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image->columns = 256;
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image->rows = 192;
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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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count=ReadBlob(image,6144,(unsigned char *) zxscr);
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if (count != 6144)
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ThrowReaderException(CorruptImageError,"ImproperImageHeader");
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count=ReadBlob(image,768,(unsigned char *) zxattr);
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if (count != 768)
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ThrowReaderException(CorruptImageError,"ImproperImageHeader");
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for(zonenr=0;zonenr<3;zonenr++)
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{
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for(zoneline=0;zoneline<8;zoneline++)
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{
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for(octetline=0;octetline<8;octetline++)
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{
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for(octetnr=(zoneline*32);octetnr<((zoneline*32)+32);octetnr++)
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{
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octet_val = zxscr[octetnr+(256*octetline)+(zonenr*2048)];
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attr_nr = zxattr[octetnr+(256*zonenr)];
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pix = (((8*octetnr)-(256*zoneline)));
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piy = ((octetline+(8*zoneline)+(zonenr*64)));
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pbin = binar;
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abin = attrbin;
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one_nr=1;
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for(z=0;z<8;z++)
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{
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if(octet_val&one_nr)
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{
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*pbin = 1;
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} else {
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*pbin = 0;
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}
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one_nr=one_nr*2;
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pbin++;
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}
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one_nr = 1;
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for(z=0;z<8;z++)
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{
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if(attr_nr&one_nr)
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{
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*abin = 1;
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} else {
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*abin = 0;
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}
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one_nr=one_nr*2;
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abin++;
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}
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ink = (attrbin[0]+(2*attrbin[1])+(4*attrbin[2]));
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paper = (attrbin[3]+(2*attrbin[4])+(4*attrbin[5]));
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bright = attrbin[6];
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if(bright) { ink=ink+8; paper=paper+8; }
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for(z=7;z>-1;z--)
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{
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q=QueueAuthenticPixels(image,pix,piy,1,1,exception);
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if (q == (PixelPacket *) NULL)
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break;
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if(binar[z])
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{
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SetPixelRed(q,ScaleCharToQuantum(
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colour_palette[3*ink]));
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SetPixelGreen(q,ScaleCharToQuantum(
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colour_palette[1+(3*ink)]));
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SetPixelBlue(q,ScaleCharToQuantum(
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colour_palette[2+(3*ink)]));
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} else {
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SetPixelRed(q,ScaleCharToQuantum(
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colour_palette[3*paper]));
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SetPixelGreen(q,ScaleCharToQuantum(
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colour_palette[1+(3*paper)]));
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SetPixelBlue(q,ScaleCharToQuantum(
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colour_palette[2+(3*paper)]));
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}
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pix++;
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}
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}
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}
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}
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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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/*
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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 S C R 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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% RegisterSCRImage() adds attributes for the SCR 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 RegisterSCRImage method is:
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%
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% size_t RegisterSCRImage(void)
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%
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*/
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ModuleExport size_t RegisterSCRImage(void)
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{
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MagickInfo
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*entry;
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entry=SetMagickInfo("SCR");
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entry->decoder=(DecodeImageHandler *) ReadSCRImage;
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entry->adjoin=MagickFalse;
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entry->description=ConstantString("ZX-Spectrum SCREEN$");
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entry->magick_module=ConstantString("SCR");
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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 S C R 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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% UnregisterSCRImage() removes format registrations made by the
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% SCR module from the list of supported formats.
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%
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% The format of the UnregisterSCRImage method is:
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%
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% UnregisterSCRImage(void)
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%
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*/
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ModuleExport void UnregisterSCRImage(void)
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{
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(void) UnregisterMagickInfo("SCR");
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}
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