www.pudn.com > giflib12.zip > GIFCLRMP.C

/***************************************************************************** 
*   "Gif-Lib" - Yet another gif library.				     * 
*									     * 
* Written by:  Gershon Elber				Ver 0.1, Jul. 1989   * 
****************************************************************************** 
* Program to modify GIF file color map(s). Images are not modified at all.   * 
* Options:								     * 
* -q : quite printing mode.						     * 
* -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.				     * 
*****************************************************************************/ 
 
#ifdef __MSDOS__ 
#include  
#include  
#endif /* __MSDOS__ */ 
 
#include  
#include  
#include  
#include  
#include "gif_lib.h" 
#include "getarg.h" 
 
#define PROGRAM_NAME	"GifClrMp" 
 
#ifdef __MSDOS__ 
extern unsigned int 
    _stklen = 16384;			     /* Increase default stack size. */ 
#endif /* __MSDOS__ */ 
 
#ifdef SYSV 
static char *VersionStr = 
        "Gif library module,\t\tGershon Elber\n\ 
	(C) Copyright 1989 Gershon Elber, Non commercial use only.\n"; 
static char 
    *CtrlStr = "GifClrMp q%- s%- l%-ColorMapFile!s g%-Gamma!F i%-Image#!d h%- GifFile!*s"; 
#else 
static char 
    *VersionStr = 
	PROGRAM_NAME 
	GIF_LIB_VERSION 
	"	Gershon Elber,	" 
	__DATE__ ",   " __TIME__ "\n" 
	"(C) Copyright 1989 Gershon Elber, Non commercial use only.\n"; 
static char 
    *CtrlStr = 
	PROGRAM_NAME 
	" q%- s%- l%-ColorMapFile!s g%-Gamma!F i%-Image#!d h%- GifFile!*s"; 
#endif /* SYSV */ 
 
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; 
    GifByteType *Extension, *CodeBlock; 
    char **FileName = NULL, *ColorFileName; 
    GifFileType *GifFileIn = NULL, *GifFileOut = NULL; 
 
    if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint, 
		&SaveFlag, &LoadFlag, &ColorFileName, 
		&GammaFlag, &Gamma, &ImageNFlag, &ImageN, 
		&HelpFlag, &NumFiles, &FileName)) != FALSE || 
		(NumFiles > 1 && !HelpFlag)) { 
	if (Error) 
	    GAPrintErrMsg(Error); 
	else if (NumFiles > 1) 
	    GIF_MESSAGE("Error in command line parsing - one GIF file please."); 
	GAPrintHowTo(CtrlStr); 
	exit(1); 
    } 
 
    if (HelpFlag) { 
	fprintf(stderr, VersionStr); 
	GAPrintHowTo(CtrlStr); 
	exit(0); 
    } 
 
    if (SaveFlag && LoadFlag || SaveFlag && GammaFlag || LoadFlag && GammaFlag) 
	GIF_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) 
	    GIF_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) == GIF_ERROR) 
	    QuitGifError(GifFileIn, GifFileOut); 
 
    /* Scan the content of the GIF file and load the image(s) in: */ 
    do { 
	if (DGifGetRecordType(GifFileIn, &RecordType) == GIF_ERROR) 
	    QuitGifError(GifFileIn, GifFileOut); 
 
	switch (RecordType) { 
	    case IMAGE_DESC_RECORD_TYPE: 
		if (DGifGetImageDesc(GifFileIn) == GIF_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) == GIF_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) == GIF_ERROR) 
		    QuitGifError(GifFileIn, GifFileOut); 
		if (HasGIFOutput) 
		    if (EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR) 
			QuitGifError(GifFileIn, GifFileOut); 
		while (CodeBlock != NULL) { 
		    if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR) 
			QuitGifError(GifFileIn, GifFileOut); 
		    if (HasGIFOutput) 
			if (EGifPutCodeNext(GifFileOut, CodeBlock) == GIF_ERROR) 
			    QuitGifError(GifFileIn, GifFileOut); 
		} 
		break; 
	    case EXTENSION_RECORD_TYPE: 
		/* Skip any extension blocks in file: */ 
		if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == GIF_ERROR) 
		    QuitGifError(GifFileIn, GifFileOut); 
		if (HasGIFOutput) 
		    if (EGifPutExtension(GifFileOut, ExtCode, Extension[0], 
							Extension) == GIF_ERROR) 
			QuitGifError(GifFileIn, GifFileOut); 
 
		/* No support to more than one extension blocks, so discard: */ 
		while (Extension != NULL) { 
		    if (DGifGetExtensionNext(GifFileIn, &Extension) == GIF_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) == GIF_ERROR) 
	QuitGifError(GifFileIn, GifFileOut); 
    if (HasGIFOutput) 
	if (EGifCloseFile(GifFileOut) == GIF_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)) 
		GIF_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 
	GIF_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); 
}