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gif_lib.arc
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GIFCLRMP.C
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1991-03-02
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/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber IBM PC Ver 0.1, Jul. 1989 *
******************************************************************************
* Program to modify GIF file color map(s). Images are not modified at all. *
* Options: *
* -s : save screen color map (unless -i - see below), to stdout. *
* -l colormap.file : substitute given colormap.file colormap into screen *
* colormap (unless -i - see below). *
* -g correction : apply gamma correction to the screen colormap (unless -i - *
* see below). *
* -i n : select image number n color map instead of screen map for above *
* operations (n = 1 for first image). *
* -h : on line help. *
* All color maps are ascii text files, with one line per color of the *
* form: index, Red color, Green color, Blue color - all in the range 0..255. *
* All color maps should be in the exact same length. *
******************************************************************************
* History: *
* 17 Jul 89 - Version 1.0 by Gershon Elber. *
*****************************************************************************/
#include <math.h>
#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 "GifPos"
#define VERSION "ß 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
" s%- l%-ColorMapFile!s g%-Gamma!F i%-Image#!d h%- GifFile!*s";
static char
*ProgramName;
static int
SaveFlag = FALSE,
LoadFlag = FALSE,
GammaFlag = FALSE;
static
double Gamma = 1.0;
static
FILE *ColorFile = NULL;
static void ModifyColorMap(GifColorType *ColorMap, int BitsPerPixel);
static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);
/******************************************************************************
* Interpret the command line and scan the given GIF file. *
******************************************************************************/
void main(int argc, char **argv)
{
int Error, NumFiles, ExtCode, CodeSize, ImageNum = 0,
ImageNFlag = FALSE, ImageN, HelpFlag = FALSE, HasGIFOutput;
GifRecordType RecordType;
ByteType *Extension, *CodeBlock;
char **FileName = NULL, *ColorFileName;
GifFileType *GifFileIn = 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,
&SaveFlag, &LoadFlag, &ColorFileName,
&GammaFlag, &Gamma, &ImageNFlag, &ImageN,
&HelpFlag, &NumFiles, &FileName)) != FALSE ||
(NumFiles > 1 && !HelpFlag)) {
if (Error) GAPrintErrMsg(Error);
else
if (NumFiles > 1)
MESSAGE("Error in command line parsing - one GIF file please\n");
GAPrintHowTo(CtrlStr);
exit(1);
}
if (HelpFlag) {
fprintf(stderr, VersionStr);
GAPrintHowTo(CtrlStr);
exit(0);
}
if (SaveFlag && LoadFlag || SaveFlag && GammaFlag || LoadFlag && GammaFlag)
EXIT("Can not handle more than one of -s -l or -g at the same time");
if (NumFiles == 1) {
if ((GifFileIn = DGifOpenFileName(*FileName)) == NULL)
QuitGifError(GifFileIn, GifFileOut);
}
else {
/* Use the stdin instead: */
if ((GifFileIn = DGifOpenFileHandle(0)) == NULL)
QuitGifError(GifFileIn, GifFileOut);
}
if (SaveFlag) {
/* We are dumping out the color map as text file to stdout: */
ColorFile = stdout;
}
else
if (LoadFlag) {
/* We are loading new color map from specified file: */
if ((ColorFile = fopen(ColorFileName, "rt")) == NULL)
EXIT("Failed to open specified color map file");
}
if ((HasGIFOutput = (LoadFlag || GammaFlag)) != 0) {
/* Open stdout for GIF output file: */
if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
QuitGifError(GifFileIn, GifFileOut);
}
if (!ImageNFlag) {
/* We are suppose to modify the screen color map, so do it: */
ModifyColorMap(GifFileIn -> SColorMap, GifFileIn -> SBitsPerPixel);
if (!HasGIFOutput) {
/* We can quit here, as we have the color map: */
if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
fclose(ColorFile);
exit(0);
}
}
/* And dump out its new possible repositioned screen information: */
if (HasGIFOutput)
if (EGifPutScreenDesc(GifFileOut,
GifFileIn -> SWidth, GifFileIn -> SHeight,
GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor,
GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
/* Scan the content of the GIF file and load the image(s) in: */
do {
if (DGifGetRecordType(GifFileIn, &RecordType) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
switch (RecordType) {
case IMAGE_DESC_RECORD_TYPE:
if (DGifGetImageDesc(GifFileIn) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (++ImageNum == ImageN && ImageNFlag) {
/* We are suppose to modify this image color map, do it: */
ModifyColorMap(GifFileIn -> SColorMap,
GifFileIn -> SBitsPerPixel);
if (!HasGIFOutput) {
/* We can quit here, as we have the color map: */
if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
fclose(ColorFile);
exit(0);
}
}
if (HasGIFOutput)
if (EGifPutImageDesc(GifFileOut,
GifFileIn -> ILeft, GifFileIn -> ITop,
GifFileIn -> IWidth, GifFileIn -> IHeight,
GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
GifFileIn -> IColorMap) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
/* Now read image itself in decoded form as we dont really */
/* care what we have there, and this is much faster. */
if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (HasGIFOutput)
if (EGifPutCode(GifFileOut, CodeSize, CodeBlock) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
while (CodeBlock != NULL) {
if (DGifGetCodeNext(GifFileIn, &CodeBlock) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (HasGIFOutput)
if (EGifPutCodeNext(GifFileOut, CodeBlock) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
break;
case EXTENSION_RECORD_TYPE:
/* Skip any extension blocks in file: */
if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (HasGIFOutput)
if (EGifPutExtension(GifFileOut, ExtCode, Extension[0],
Extension) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
/* No support to more than one extension blocks, so discard: */
while (Extension != NULL) {
if (DGifGetExtensionNext(GifFileIn, &Extension) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
break;
case TERMINATE_RECORD_TYPE:
break;
default: /* Should be traps by DGifGetRecordType */
break;
}
}
while (RecordType != TERMINATE_RECORD_TYPE);
if (DGifCloseFile(GifFileIn) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (HasGIFOutput)
if (EGifCloseFile(GifFileOut) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
/******************************************************************************
* Modify the given colormap according to global variables setting. *
******************************************************************************/
static void ModifyColorMap(GifColorType *ColorMap, int BitsPerPixel)
{
int i, Dummy, Red, Green, Blue;
double Gamma1;
if (SaveFlag) {
/* Save this color map to ColorFile: */
for (i=0; i<(1 << BitsPerPixel); i++)
fprintf(ColorFile, "%3d %3d %3d %3d\n", i,
ColorMap[i].Red, ColorMap[i].Green, ColorMap[i].Blue);
}
else
if (LoadFlag) {
/* Read the color map in ColorFile into this color map: */
for (i=0; i<(1 << BitsPerPixel); i++) {
if (feof(ColorFile))
EXIT("Color file to load color map from, too small");
fscanf(ColorFile, "%3d %3d %3d %3d\n", &Dummy, &Red, &Green, &Blue);
ColorMap[i].Red = Red;
ColorMap[i].Green = Green;
ColorMap[i].Blue = Blue;
}
}
else
if (GammaFlag) {
/* Apply gamma correction to this color map: */
Gamma1 = 1.0 / Gamma;
for (i=0; i<(1 << BitsPerPixel); i++) {
ColorMap[i].Red =
((int) (255 * pow(ColorMap[i].Red / 255.0, Gamma1)));
ColorMap[i].Green =
((int) (255 * pow(ColorMap[i].Green / 255.0, Gamma1)));
ColorMap[i].Blue =
((int) (255 * pow(ColorMap[i].Blue / 255.0, Gamma1)));
}
}
else EXIT("Nothing to do!");
}
/******************************************************************************
* Close both input and output file (if open), and exit. *
******************************************************************************/
static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut)
{
PrintGifError();
if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
if (GifFileOut != NULL) EGifCloseFile(GifFileOut);
exit(1);
}