/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber IBM PC Ver 0.1, Jul. 1989 *
******************************************************************************
* Program to combine 2 GIF images into single one, using optional mask GIF *
* file. Result colormap will be the union of the two images colormaps. *
* Both images should have exactly the same size, although they may be mapped *
* differently on screen. Only First GIF screen descriptor info. is used. *
* Options: *
* -m mask : optional boolean image, defines where second GIF should be used. *
* -h : on line help. *
******************************************************************************
* History: *
* 12 Jul 89 - Version 1.0 by Gershon Elber. *
*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <alloc.h>
#include <string.h>
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "GifComb"
#define VERSION "รก Version 1.0, "
extern unsigned int
_stklen = 16384; /* Increase default stack size */
static char
*VersionStr =
PROGRAM_NAME
" IBMPC "
VERSION
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
static char
*CtrlStr =
PROGRAM_NAME
" m%-MaskGIFFile!s h%- GifFile!*s";
static char
*ProgramName;
static int ReadUntilImage(GifFileType *GifFile);
static int UnionColorMap(GifColorType *ColorIn1, int ColorIn1Size,
GifColorType *ColorIn2, int ColorIn2Size,
GifColorType **ColorUnionPtr, int *ColorUnionSize,
PixelType ColorTransIn2[]);
static void QuitGifError(GifFileType *GifFileIn1, GifFileType *GifFileIn2,
GifFileType *GifMaskFile, GifFileType *GifFileOut);
/******************************************************************************
* Interpret the command line and scan the given GIF file. *
******************************************************************************/
void main(int argc, char **argv)
{
int i, j, Error, NumFiles, Size, ColorUnionSize,
ColorIn1Size, ColorIn2Size,
MaskFlag = FALSE, HelpFlag = FALSE;
char **FileName = NULL, *MaskFileName;
PixelType ColorTransIn2[256];
RowType LineIn1, LineIn2, LineMask, LineOut;
GifColorType *ColorIn1, *ColorIn2, *ColorUnion;
GifFileType *GifFileIn1 = NULL, *GifFileIn2 = NULL, *GifMaskFile = NULL,
*GifFileOut = NULL;
if (strlen(ProgramName = argv[0]) == 0) /* DOS 3.x only! */
ProgramName = PROGRAM_NAME; /* Do something reasonable for 2.x */
if ((Error = GAGetArgs(argc, argv, CtrlStr,
&MaskFlag, &MaskFileName,
&HelpFlag, &NumFiles, &FileName)) != FALSE ||
(NumFiles != 2 && !HelpFlag)) {
if (Error) GAPrintErrMsg(Error);
else
if (NumFiles != 2)
MESSAGE("Error in command line parsing - two GIF file please\n");
GAPrintHowTo(CtrlStr);
exit(1);
}
if (HelpFlag) {
fprintf(stderr, VersionStr);
GAPrintHowTo(CtrlStr);
exit(0);
}
/* Open all input files (two GIF to combine, and optional mask): */
if ((GifFileIn1 = DGifOpenFileName(FileName[0])) == NULL ||
(GifFileIn2 = DGifOpenFileName(FileName[1])) == NULL ||
(MaskFlag && (GifMaskFile = DGifOpenFileName(MaskFileName)) == NULL))
QuitGifError(GifFileIn1, GifFileIn2, GifMaskFile, GifFileOut);
if (ReadUntilImage(GifFileIn1) == ERROR ||
ReadUntilImage(GifFileIn2) == ERROR ||
(MaskFlag && ReadUntilImage(GifMaskFile) == ERROR))
QuitGifError(GifFileIn1, GifFileIn2, GifMaskFile, GifFileOut);
if (GifFileIn1 -> IWidth != GifFileIn2 -> IWidth ||
GifFileIn2 -> IHeight != GifFileIn2 -> IHeight ||
(MaskFlag && (GifFileIn1 -> IWidth != GifMaskFile -> IWidth ||
GifFileIn1 -> IHeight != GifMaskFile -> IHeight)))
EXIT("Given GIF files have different image dimensions\n");
/* Open stdout for the output file: */
if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
QuitGifError(GifFileIn1, GifFileIn2, GifMaskFile, GifFileOut);
Size = sizeof(PixelType) * GifFileIn1 -> IWidth;
if ((LineIn1 = (RowType) malloc(Size)) == NULL ||
(LineIn2 = (RowType) malloc(Size)) == NULL ||
(MaskFlag && (LineMask = (RowType) malloc(Size)) == NULL) ||
(LineOut = (RowType) malloc(Size)) == NULL)
EXIT("Failed to allocate memory required, aborted");
if (GifFileIn1 -> IColorMap) {
ColorIn1 = GifFileIn1 -> IColorMap;
ColorIn1Size = 1 << GifFileIn1 -> IBitsPerPixel;
}
else
if (GifFileIn1 -> SColorMap) {
ColorIn1 = GifFileIn1 -> SColorMap;
ColorIn1Size = 1 << GifFileIn1 -> SBitsPerPixel;
}
else EXIT("Neither Screen nor Image color map exists - GIF file 1\n");
if (GifFileIn2 -> IColorMap) {
ColorIn2 = GifFileIn2 -> IColorMap;
ColorIn2Size = 1 << GifFileIn2 -> IBitsPerPixel;
}
else
if (GifFileIn2 -> SColorMap) {
ColorIn2 = GifFileIn2 -> SColorMap;
ColorIn2Size = 1 << GifFileIn2 -> SBitsPerPixel;
}
else EXIT("Neither Screen nor Image color map exists - GIF file 2\n");
/* Create union of the two given color maps. ColorIn1 will be copied as */
/* is while ColorIn2 will be mapped using ColorTransIn2 table. */
/* ColorUnion is allocated by the procedure itself. */
if (UnionColorMap(ColorIn1, ColorIn1Size, ColorIn2, ColorIn2Size,
&ColorUnion, &ColorUnionSize, ColorTransIn2) == ERROR)
EXIT("Unioned color map is two big (>256 colors)");
/* Dump out new image and screen descriptors: */
if (EGifPutScreenDesc(GifFileOut,
GifFileIn1 -> SWidth, GifFileIn1 -> SHeight,
ColorUnionSize, GifFileIn1 -> SBackGroundColor,
ColorUnionSize, ColorUnion) == ERROR)
QuitGifError(GifFileIn1, GifFileIn2, GifMaskFile, GifFileOut);
free((char *) ColorUnion); /* We dont need this any more... */
if (EGifPutImageDesc(GifFileOut,
GifFileIn1 -> ILeft, GifFileIn1 -> ITop,
GifFileIn1 -> IWidth, GifFileIn1 -> IHeight,
GifFileIn1 -> IInterlace, GifFileIn1 -> IBitsPerPixel, NULL) == ERROR)
QuitGifError(GifFileIn1, GifFileIn2, GifMaskFile, GifFileOut);
/* Time to do it: read 2 scan lines from 2 files (and optionally from */
/* the mask file, merge them and them result out. Do it Height times: */
fprintf(stderr, "\n%s: Image 1 at (%d, %d) [%dx%d]: ",
ProgramName, GifFileOut -> ILeft, GifFileOut -> ITop,
GifFileOut -> IWidth, GifFileOut -> IHeight);
for (i=0; i<GifFileIn1 -> IHeight; i++) {
if (DGifGetLine(GifFileIn1, LineIn1, GifFileIn1 -> IWidth) == ERROR ||
DGifGetLine(GifFileIn2, LineIn2, GifFileIn2 -> IWidth) == ERROR ||
(MaskFlag &&
DGifGetLine(GifMaskFile, LineMask, GifMaskFile -> IWidth)
== ERROR))
QuitGifError(GifFileIn1, GifFileIn2, GifMaskFile, GifFileOut);
if (MaskFlag) {
/* Every time Mask has non background color, use LineIn1 pixel, */
/* otherwise use LineIn2 pixel instead. */
for (j=0; j<GifFileIn1 -> IWidth; j++) {
if (LineMask[j] != GifMaskFile -> SBackGroundColor)
LineOut[j] = LineIn1[j];
else LineOut[j] = ColorTransIn2[LineIn2[j]];
}
}
else {
/* Every time Color of Image 1 is equal to background - take it */
/* From Image 2 instead of the background. */
for (j=0; j<GifFileIn1 -> IWidth; j++) {
if (LineIn1[j] != GifFileIn1 -> SBackGroundColor)
LineOut[j] = LineIn1[j];
else LineOut[j] = ColorTransIn2[LineIn2[j]];
}
}
if (EGifPutLine(GifFileOut, LineOut, GifFileOut -> IWidth)
== ERROR)
QuitGifError(GifFileIn1, GifFileIn2, GifMaskFile, GifFileOut);
fprintf(stderr, "\b\b\b\b%-4d", i);
}
if (DGifCloseFile(GifFileIn1) == ERROR ||
DGifCloseFile(GifFileIn2) == ERROR ||
EGifCloseFile(GifFileOut) == ERROR ||
(MaskFlag && DGifCloseFile(GifMaskFile) == ERROR))
QuitGifError(GifFileIn1, GifFileIn2, GifMaskFile, GifFileOut);
}
/******************************************************************************
* Read until first image in GIF file is detected and read its descriptor. *
******************************************************************************/
static int ReadUntilImage(GifFileType *GifFile)
{
int ExtCode;
GifRecordType RecordType;
ByteType *Extension;
/* Scan the content of the GIF file, until image descriptor is detected: */
do {
if (DGifGetRecordType(GifFile, &RecordType) == ERROR)
return ERROR;
switch (RecordType) {
case IMAGE_DESC_RECORD_TYPE:
return DGifGetImageDesc(GifFile);
case EXTENSION_RECORD_TYPE:
/* Skip any extension blocks in file: */
if (DGifGetExtension(GifFile, &ExtCode, &Extension) == ERROR)
return ERROR;
while (Extension != NULL)
if (DGifGetExtensionNext(GifFile, &Extension) == ERROR)
return ERROR;
break;
case TERMINATE_RECORD_TYPE:
break;
default: /* Should be traps by DGifGetRecordType */
break;
}
}
while (RecordType != TERMINATE_RECORD_TYPE);
return ERROR; /* We should be here - no image was found! */
}
/******************************************************************************
* Create union of the two given color maps and return it. If result can not *
* fit into 256 colors, ERROR is returned, OK otherwise. *
* ColorIn1 is copied as it to ColorUnion, while colors from ColorIn2 are *
* copied iff they dont exists before. ColorTransIn2 is used to map old *
* ColorIn2 into ColorUnion color map table. *
******************************************************************************/
static int UnionColorMap(GifColorType *ColorIn1, int ColorIn1Size,
GifColorType *ColorIn2, int ColorIn2Size,
GifColorType **ColorUnionPtr, int *ColorUnionSize,
PixelType ColorTransIn2[])
{
int i, j, CrntSlot;
GifColorType *ColorUnion;
/* Allocate table which will hold result for sure: */
*ColorUnionPtr = ColorUnion = (GifColorType *) malloc(sizeof(GifColorType)
* (ColorIn1Size > ColorIn2Size ? ColorIn1Size : ColorIn2Size) * 2);
/* Copy ColorIn1 to ColorUnionSize; */
for (i=0; i<ColorIn1Size; i++) ColorUnion[i] = ColorIn1[i];
CrntSlot = ColorIn1Size; /* Current Empty slot */
/* Copy ColorIn2 to ColorUnionSize (use old colors if exists): */
for (i=0; i<ColorIn2Size && CrntSlot<=256; i++) {
/* Let see if this color already exists: */
for (j=0; j<ColorIn1Size; j++) {
/* If memcmp does not exists for you, use the following: */
/*
if (ColorIn1[j].Red == ColorIn2[i].Red &&
ColorIn1[j].Green == ColorIn2[i].Green &&
ColorIn1[j].Blue == ColorIn2[i].Blue) break;
*/
if (memcmp(&ColorIn1[j], &ColorIn2[i], 3) == 0) break;
}
if (j < ColorIn1Size) {
/* We found this color aleardy exists in ColorIn1: */
ColorTransIn2[i] = j;
}
else {
/* Its new - copy it to a new slot: */
ColorUnion[CrntSlot] = ColorIn2[i];
ColorTransIn2[i] = CrntSlot++;
}
}
if (CrntSlot > 256) return ERROR;
/* Complete the color map to a power of two: */
for (i=1; i<=8; i++) if ((1 << i) >= CrntSlot) break;
for (j=CrntSlot; j<(1 << i); j++)
ColorUnion[j].Red = ColorUnion[j].Green = ColorUnion[j].Blue = 0;
*ColorUnionSize = i;
return OK;
}
/******************************************************************************
* Close both input and output file (if open), and exit. *
******************************************************************************/
static void QuitGifError(GifFileType *GifFileIn1, GifFileType *GifFileIn2,
GifFileType *GifMaskFile, GifFileType *GifFileOut)
{
PrintGifError();
if (GifFileIn1 != NULL) DGifCloseFile(GifFileIn1);
if (GifFileIn2 != NULL) DGifCloseFile(GifFileIn2);
if (GifMaskFile != NULL) DGifCloseFile(GifMaskFile);
if (GifFileOut != NULL) EGifCloseFile(GifFileOut);
exit(1);
}
