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279
G/UTIL/GIFCLRMP.C
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279
G/UTIL/GIFCLRMP.C
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/*****************************************************************************
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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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* Program to modify GIF file color map(s). Images are not modified at all. *
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* Options: *
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* -q : quite printing mode. *
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* -s : save screen color map (unless -i - see below), to stdout. *
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* -l colormap.file : substitute given colormap.file colormap into screen *
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* colormap (unless -i - see below). *
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* -g correction : apply gamma correction to the screen colormap (unless -i - *
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* see below). *
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* -i n : select image number n color map instead of screen map for above *
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* operations (n = 1 for first image). *
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* -h : on line help. *
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* All color maps are ascii text files, with one line per color of the *
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* form: index, Red color, Green color, Blue color - all in the range 0..255. *
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* All color maps should be in the exact same length. *
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******************************************************************************
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* History: *
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* 17 Jul 89 - Version 1.0 by Gershon Elber. *
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*****************************************************************************/
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#ifdef __MSDOS__
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#include <stdlib.h>
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#include <alloc.h>
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#endif /* __MSDOS__ */
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#include <math.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include "gif_lib.h"
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#include "getarg.h"
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#define PROGRAM_NAME "GifClrMp"
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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 library module,\t\tGershon Elber\n\
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(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
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static char
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*CtrlStr = "GifClrMp q%- s%- l%-ColorMapFile!s g%-Gamma!F i%-Image#!d h%- GifFile!*s";
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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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" Gershon Elber, "
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__DATE__ ", " __TIME__ "\n"
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"(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
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static char
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*CtrlStr =
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PROGRAM_NAME
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" q%- s%- l%-ColorMapFile!s g%-Gamma!F i%-Image#!d h%- GifFile!*s";
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#endif /* SYSV */
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static int
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SaveFlag = FALSE,
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LoadFlag = FALSE,
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GammaFlag = FALSE;
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static
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double Gamma = 1.0;
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static
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FILE *ColorFile = NULL;
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static void ModifyColorMap(GifColorType *ColorMap, int BitsPerPixel);
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static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);
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/******************************************************************************
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* Interpret the command line and scan the given GIF file. *
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******************************************************************************/
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void main(int argc, char **argv)
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{
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int Error, NumFiles, ExtCode, CodeSize, ImageNum = 0,
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ImageNFlag = FALSE, ImageN, HelpFlag = FALSE, HasGIFOutput;
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GifRecordType RecordType;
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GifByteType *Extension, *CodeBlock;
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char **FileName = NULL, *ColorFileName;
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GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
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if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint,
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&SaveFlag, &LoadFlag, &ColorFileName,
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&GammaFlag, &Gamma, &ImageNFlag, &ImageN,
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&HelpFlag, &NumFiles, &FileName)) != FALSE ||
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(NumFiles > 1 && !HelpFlag)) {
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if (Error)
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GAPrintErrMsg(Error);
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else if (NumFiles > 1)
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GIF_MESSAGE("Error in command line parsing - one GIF file please.");
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GAPrintHowTo(CtrlStr);
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exit(1);
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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(0);
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}
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if (SaveFlag && LoadFlag || SaveFlag && GammaFlag || LoadFlag && GammaFlag)
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GIF_EXIT("Can not handle more than one of -s -l or -g at the same time.");
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if (NumFiles == 1) {
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if ((GifFileIn = DGifOpenFileName(*FileName)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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}
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else {
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/* Use the stdin instead: */
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if ((GifFileIn = DGifOpenFileHandle(0)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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}
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if (SaveFlag) {
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/* We are dumping out the color map as text file to stdout: */
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ColorFile = stdout;
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}
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else if (LoadFlag) {
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/* We are loading new color map from specified file: */
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if ((ColorFile = fopen(ColorFileName, "rt")) == NULL)
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GIF_EXIT("Failed to open specified color map file.");
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}
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if ((HasGIFOutput = (LoadFlag || GammaFlag)) != 0) {
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/* Open stdout for GIF output file: */
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if ((GifFileOut = EGifOpenFileHandle(1)) == NULL)
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QuitGifError(GifFileIn, GifFileOut);
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}
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if (!ImageNFlag) {
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/* We are suppose to modify the screen color map, so do it: */
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ModifyColorMap(GifFileIn -> SColorMap, GifFileIn -> SBitsPerPixel);
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if (!HasGIFOutput) {
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/* We can quit here, as we have the color map: */
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if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
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fclose(ColorFile);
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exit(0);
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}
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}
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/* And dump out its new possible repositioned screen information: */
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if (HasGIFOutput)
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if (EGifPutScreenDesc(GifFileOut,
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GifFileIn -> SWidth, GifFileIn -> SHeight,
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GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor,
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GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Scan the content of the GIF file and load the image(s) in: */
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do {
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if (DGifGetRecordType(GifFileIn, &RecordType) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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switch (RecordType) {
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case IMAGE_DESC_RECORD_TYPE:
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if (DGifGetImageDesc(GifFileIn) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (++ImageNum == ImageN && ImageNFlag) {
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/* We are suppose to modify this image color map, do it: */
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ModifyColorMap(GifFileIn -> SColorMap,
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GifFileIn -> SBitsPerPixel);
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if (!HasGIFOutput) {
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/* We can quit here, as we have the color map: */
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if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
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fclose(ColorFile);
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exit(0);
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}
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}
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if (HasGIFOutput)
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if (EGifPutImageDesc(GifFileOut,
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GifFileIn -> ILeft, GifFileIn -> ITop,
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GifFileIn -> IWidth, GifFileIn -> IHeight,
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GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel,
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GifFileIn -> IColorMap) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* Now read image itself in decoded form as we dont really */
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/* care what we have there, and this is much faster. */
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if (DGifGetCode(GifFileIn, &CodeSize, &CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (HasGIFOutput)
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if (EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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while (CodeBlock != NULL) {
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if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (HasGIFOutput)
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if (EGifPutCodeNext(GifFileOut, CodeBlock) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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break;
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case EXTENSION_RECORD_TYPE:
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/* Skip any extension blocks in file: */
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if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (HasGIFOutput)
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if (EGifPutExtension(GifFileOut, ExtCode, Extension[0],
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Extension) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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/* No support to more than one extension blocks, so discard: */
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while (Extension != NULL) {
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if (DGifGetExtensionNext(GifFileIn, &Extension) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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break;
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case TERMINATE_RECORD_TYPE:
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break;
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default: /* Should be traps by DGifGetRecordType. */
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break;
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}
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}
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while (RecordType != TERMINATE_RECORD_TYPE);
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if (DGifCloseFile(GifFileIn) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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if (HasGIFOutput)
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if (EGifCloseFile(GifFileOut) == GIF_ERROR)
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QuitGifError(GifFileIn, GifFileOut);
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}
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/******************************************************************************
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* Modify the given colormap according to global variables setting. *
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******************************************************************************/
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static void ModifyColorMap(GifColorType *ColorMap, int BitsPerPixel)
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{
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int i, Dummy, Red, Green, Blue;
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double Gamma1;
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if (SaveFlag) {
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/* Save this color map to ColorFile: */
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for (i = 0; i < (1 << BitsPerPixel); i++)
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fprintf(ColorFile, "%3d %3d %3d %3d\n", i,
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ColorMap[i].Red, ColorMap[i].Green, ColorMap[i].Blue);
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}
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else if (LoadFlag) {
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/* Read the color map in ColorFile into this color map: */
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for (i = 0; i < (1 << BitsPerPixel); i++) {
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if (feof(ColorFile))
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GIF_EXIT("Color file to load color map from, too small.");
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fscanf(ColorFile, "%3d %3d %3d %3d\n", &Dummy, &Red, &Green, &Blue);
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ColorMap[i].Red = Red;
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ColorMap[i].Green = Green;
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ColorMap[i].Blue = Blue;
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}
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}
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else if (GammaFlag) {
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/* Apply gamma correction to this color map: */
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Gamma1 = 1.0 / Gamma;
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for (i = 0; i < (1 << BitsPerPixel); i++) {
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ColorMap[i].Red =
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((int) (255 * pow(ColorMap[i].Red / 255.0, Gamma1)));
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ColorMap[i].Green =
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((int) (255 * pow(ColorMap[i].Green / 255.0, Gamma1)));
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ColorMap[i].Blue =
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((int) (255 * pow(ColorMap[i].Blue / 255.0, Gamma1)));
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}
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}
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else
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GIF_EXIT("Nothing to do!");
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}
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/******************************************************************************
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* Close both input and output file (if open), and exit. *
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******************************************************************************/
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static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut)
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{
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PrintGifError();
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if (GifFileIn != NULL) DGifCloseFile(GifFileIn);
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if (GifFileOut != NULL) EGifCloseFile(GifFileOut);
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exit(1);
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}
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