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