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128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*****************************************************************************
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* "Gif-Lib" - Yet another gif library. *
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* *
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* Written by: Gershon Elber Ver 0.1, Jul. 1989 *
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******************************************************************************
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* Takes a multi-image gif and yields the overlay of all the images *
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******************************************************************************
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* History: *
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* 6 May 94 - Version 1.0 by Eric Raymond. *
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef __MSDOS__
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#include <dos.h>
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#include <alloc.h>
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#include <graphics.h>
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#include <io.h>
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#endif /* __MSDOS__ */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif /* HAVE_FCNTL_H */
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#include "getarg.h"
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#include "gif_lib.h"
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#define PROGRAM_NAME "gifovly"
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#ifdef __MSDOS__
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extern unsigned int
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_stklen = 16384; /* Increase default stack size. */
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#endif /* __MSDOS__ */
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#ifdef SYSV
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static char *VersionStr =
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"Gif compiler,\t\tEric S. Raymond\n\
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(C) Copyright 1992 Eric S. Raymond, all rights reserved.\n";
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static char
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*CtrlStr = "GifOvly t%-TransparentColor!d h%-";
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#else
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static char
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*VersionStr =
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PROGRAM_NAME
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GIF_LIB_VERSION
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" Eric Raymond, "
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__DATE__ ", " __TIME__ "\n"
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"(C) Copyright 1992 Eric Raymond.\n";
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static char
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*CtrlStr =
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PROGRAM_NAME
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" t%-TransparentColor!d h%-";
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#endif /* SYSV */
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int main(int argc, char **argv)
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{
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int k;
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GifFileType *GifFileIn, *GifFileOut = (GifFileType *)NULL;
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SavedImage *bp;
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int Error, TransparentColorFlag = FALSE, TransparentColor = 0,
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HelpFlag = FALSE;
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if ((Error = GAGetArgs(argc, argv, CtrlStr,
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&TransparentColorFlag, &TransparentColor,
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&HelpFlag)) != FALSE) {
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GAPrintErrMsg(Error);
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GAPrintHowTo(CtrlStr);
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exit(EXIT_FAILURE);
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}
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if (HelpFlag) {
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fprintf(stderr, VersionStr);
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GAPrintHowTo(CtrlStr);
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exit(EXIT_SUCCESS);
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}
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if ((GifFileIn = DGifOpenFileHandle(0)) == NULL
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|| DGifSlurp(GifFileIn) == GIF_ERROR
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|| ((GifFileOut = EGifOpenFileHandle(1)) == (GifFileType *)NULL))
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{
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PrintGifError();
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exit(EXIT_FAILURE);
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}
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GifFileOut->SWidth = GifFileIn->SWidth;
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GifFileOut->SHeight = GifFileIn->SHeight;
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GifFileOut->SColorResolution = GifFileIn->SColorResolution;
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GifFileOut->SBackGroundColor = GifFileIn->SBackGroundColor;
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GifFileOut->SColorMap = MakeMapObject(
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GifFileIn->SColorMap->ColorCount,
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GifFileIn->SColorMap->Colors);
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/* The output file will have exactly one image */
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MakeSavedImage(GifFileOut, &GifFileIn->SavedImages[0]);
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bp = &GifFileOut->SavedImages[0];
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for (k = 1; k < GifFileIn->ImageCount; k++)
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{
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register int i, j;
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register unsigned char *sp, *tp;
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SavedImage *ovp = &GifFileIn->SavedImages[k];
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for (i = 0; i < ovp->ImageDesc.Height; i++)
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{
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tp = bp->RasterBits + (ovp->ImageDesc.Top + i) * bp->ImageDesc.Width + ovp->ImageDesc.Left;
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sp = ovp->RasterBits + i * ovp->ImageDesc.Width;
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for (j = 0; j < ovp->ImageDesc.Width; j++)
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if (!TransparentColorFlag || sp[j] != TransparentColor)
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tp[j] = sp[j];
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}
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}
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if (EGifSpew(GifFileOut) == GIF_ERROR)
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PrintGifError();
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else if (DGifCloseFile(GifFileIn) == GIF_ERROR)
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PrintGifError();
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return 0;
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}
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/* gifovly.c ends here */
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