www.pudn.com > giflib12.zip > GIF2RGB.C

/***************************************************************************** 
*   "Gif-Lib" - Yet another gif library.				     * 
*									     * 
* Written by:  Gershon Elber				Ver 0.1, Jul. 1989   * 
****************************************************************************** 
* Program to convert GIF file to RGB 24 bits.				     * 
* Options:								     * 
* -q : quite printing mode.						     * 
* -1 : dump as one file using RGBRGB triples.				     * 
* -h : on line help.							     * 
* -o FileName : specify the output file name(s).			     * 
****************************************************************************** 
* History:								     * 
* 5 Jan 90 - Version 1.0 by Gershon Elber.				     * 
*****************************************************************************/ 
 
#ifdef __MSDOS__ 
#include  
#include  
#include  
#include  
#include  
#include  
#endif /* __MSDOS__ */ 
 
#include  
#include  
#include  
#include  
#include "gif_lib.h" 
#include "getarg.h" 
 
#define PROGRAM_NAME	"Gif2RGB" 
 
#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 = "Gif2RGB q%- 1%- o%-OutFileName!s 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%- 1%- o%-OutFileName!s h%- GifFile!*s"; 
#endif /* SYSV */ 
 
/* Make some variables global, so we could access them faster: */ 
static int 
    ImageNum = 0, 
    BackGround = 0, 
    OneFileFlag = FALSE, 
    HelpFlag = FALSE, 
    ColorMapSize = 0, 
    InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */ 
    InterlacedJumps[] = { 8, 8, 4, 2 };    /* be read - offsets and jumps... */ 
static GifColorType 
    *ColorMap; 
 
static void DumpScreen2RGB(char *FileName, int OneFileFlag, 
			   GifRowType *ScreenBuffer, 
			   int ScreenWidth, int ScreenHeight); 
 
/****************************************************************************** 
* Interpret the command line and scan the given GIF file.		      * 
******************************************************************************/ 
void main(int argc, char **argv) 
{ 
    int	i, j, Error, NumFiles, Size, Row, Col, Width, Height, ExtCode, Count, 
	OutFileFlag = FALSE; 
    GifRecordType RecordType; 
    GifByteType *Extension; 
    char *OutFileName, 
	**FileName = NULL; 
    GifRowType *ScreenBuffer; 
    GifFileType *GifFile; 
 
    if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint, 
		&OneFileFlag, &OutFileFlag, &OutFileName, 
		&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 (!OutFileFlag) OutFileName = NULL; 
 
    if (NumFiles == 1) { 
	if ((GifFile = DGifOpenFileName(*FileName)) == NULL) { 
	    PrintGifError(); 
	    exit(-1); 
	} 
    } 
    else { 
	/* Use the stdin instead: */ 
 
#ifdef __MSDOS__ 
	setmode(0, O_BINARY); 
#endif /* __MSDOS__ */ 
	if ((GifFile = DGifOpenFileHandle(0)) == NULL) { 
	    PrintGifError(); 
	    exit(-1); 
	} 
    } 
 
    /* Allocate the screen as vector of column of rows. We cannt allocate    */ 
    /* the all screen at once, as this broken minded CPU can allocate up to  */ 
    /* 64k at a time and our image can be bigger than that:		     */ 
    /* Note this screen is device independent - its the screen as defined by */ 
    /* the GIF file parameters itself.					     */ 
    if ((ScreenBuffer = (GifRowType *) 
	malloc(GifFile -> SHeight * sizeof(GifRowType *))) == NULL) 
	    GIF_EXIT("Failed to allocate memory required, aborted."); 
 
    Size = GifFile -> SWidth * sizeof(GifPixelType);/* Size in bytes one row.*/ 
    if ((ScreenBuffer[0] = (GifRowType) malloc(Size)) == NULL) /* First row. */ 
	GIF_EXIT("Failed to allocate memory required, aborted."); 
 
    for (i = 0; i < GifFile -> SWidth; i++)  /* Set its color to BackGround. */ 
	ScreenBuffer[0][i] = GifFile -> SBackGroundColor; 
    for (i = 1; i < GifFile -> SHeight; i++) { 
	/* Allocate the other rows, and set their color to background too: */ 
	if ((ScreenBuffer[i] = (GifRowType) malloc(Size)) == NULL) 
	    GIF_EXIT("Failed to allocate memory required, aborted."); 
 
	memcpy(ScreenBuffer[i], ScreenBuffer[0], Size); 
    } 
 
    /* Scan the content of the GIF file and load the image(s) in: */ 
    do { 
	if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR) { 
	    PrintGifError(); 
	    exit(-1); 
	} 
	switch (RecordType) { 
	    case IMAGE_DESC_RECORD_TYPE: 
		if (DGifGetImageDesc(GifFile) == GIF_ERROR) { 
		    PrintGifError(); 
		    exit(-1); 
		} 
		Row = GifFile -> ITop; /* Image Position relative to Screen. */ 
		Col = GifFile -> ILeft; 
		Width = GifFile -> IWidth; 
		Height = GifFile -> IHeight; 
		GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]:     ", 
		    PROGRAM_NAME, ++ImageNum, Col, Row, Width, Height); 
		if (GifFile -> ILeft + GifFile -> IWidth > GifFile -> SWidth || 
		   GifFile -> ITop + GifFile -> IHeight > GifFile -> SHeight) { 
		    fprintf(stderr, "Image %d is not confined to screen dimension, aborted.\n"); 
		    exit(-2); 
		} 
		if (GifFile -> IInterlace) { 
		    /* Need to perform 4 passes on the images: */ 
		    for (Count = i = 0; i < 4; i++) 
			for (j = Row + InterlacedOffset[i]; j < Row + Height; 
						 j += InterlacedJumps[i]) { 
			    GifQprintf("\b\b\b\b%-4d", Count++); 
			    if (DGifGetLine(GifFile, &ScreenBuffer[j][Col], 
				Width) == GIF_ERROR) { 
				PrintGifError(); 
				exit(-1); 
			    } 
			} 
		} 
		else { 
		    for (i = 0; i < Height; i++) { 
			GifQprintf("\b\b\b\b%-4d", i); 
			if (DGifGetLine(GifFile, &ScreenBuffer[Row++][Col], 
				Width) == GIF_ERROR) { 
			    PrintGifError(); 
			    exit(-1); 
			} 
		    } 
		} 
		break; 
	    case EXTENSION_RECORD_TYPE: 
		/* Skip any extension blocks in file: */ 
		if (DGifGetExtension(GifFile, &ExtCode, &Extension) == GIF_ERROR) { 
		    PrintGifError(); 
		    exit(-1); 
		} 
		while (Extension != NULL) { 
		    if (DGifGetExtensionNext(GifFile, &Extension) == GIF_ERROR) { 
			PrintGifError(); 
			exit(-1); 
		    } 
		} 
		break; 
	    case TERMINATE_RECORD_TYPE: 
		break; 
	    default:		    /* Should be traps by DGifGetRecordType. */ 
		break; 
	} 
    } 
    while (RecordType != TERMINATE_RECORD_TYPE); 
 
    /* Lets dump it - set the global variables required and do it: */ 
    BackGround = GifFile -> SBackGroundColor; 
    ColorMap = (GifFile -> IColorMap ? GifFile -> IColorMap : 
				       GifFile -> SColorMap); 
    ColorMapSize = 1 << (GifFile -> IColorMap ? GifFile -> IBitsPerPixel : 
				                GifFile -> SBitsPerPixel); 
    DumpScreen2RGB(OutFileName, OneFileFlag, 
		   ScreenBuffer, GifFile -> SWidth, GifFile -> SHeight); 
 
    if (DGifCloseFile(GifFile) == GIF_ERROR) { 
	PrintGifError(); 
	exit(-1); 
    } 
} 
 
/****************************************************************************** 
* The real dumping routine.						      * 
******************************************************************************/ 
static void DumpScreen2RGB(char *FileName, int OneFileFlag, 
			   GifRowType *ScreenBuffer, 
			   int ScreenWidth, int ScreenHeight) 
{ 
    int i, j; 
    GifRowType GifRow; 
    static GifColorType 
	*ColorMapEntry; 
    FILE *f[3]; 
 
    if (FileName != NULL) { 
	char OneFileName[80]; 
 
	if (OneFileFlag) { 
#ifdef __MSDOS__ 
	    if ((f[0] = fopen(FileName, "wb")) == NULL) 
#else 
	    if ((f[0] = fopen(FileName, "w")) == NULL) 
#endif /* __MSDOS__ */ 
		GIF_EXIT("Can't open input file name."); 
	} 
	else { 
	    static char *Postfixes[] = { ".R", ".G", ".B" }; 
 
	    for (i = 0; i < 3; i++) { 
		strcpy(OneFileName, FileName); 
		strcat(OneFileName, Postfixes[i]); 
 
#ifdef __MSDOS__ 
		if ((f[i] = fopen(OneFileName, "wb")) == NULL) 
#else 
		if ((f[i] = fopen(OneFileName, "w")) == NULL) 
#endif /* __MSDOS__ */ 
 
		    GIF_EXIT("Can't open input file name."); 
	    } 
	} 
    } 
    else { 
	OneFileFlag = TRUE; 
 
#ifdef __MSDOS__ 
	setmode(0, O_BINARY); 
#endif /* __MSDOS__ */ 
 
	f[0] = stdout; 
    } 
 
    if (OneFileFlag) { 
	unsigned char *Buffer, *BufferP; 
 
	if ((Buffer = (unsigned char *) malloc(ScreenWidth * 3)) == NULL) 
	    GIF_EXIT("Failed to allocate memory required, aborted."); 
 
	for (i = 0; i < ScreenHeight; i++) { 
	    GifRow = ScreenBuffer[i]; 
	    GifQprintf("\b\b\b\b%-4d", ScreenHeight - i); 
	    for (j = 0, BufferP = Buffer; j < ScreenWidth; j++) { 
		ColorMapEntry = &ColorMap[GifRow[j]]; 
		*BufferP++ = ColorMapEntry -> Red; 
		*BufferP++ = ColorMapEntry -> Green; 
		*BufferP++ = ColorMapEntry -> Blue; 
	    } 
	    if (fwrite(Buffer, ScreenWidth * 3, 1, f[0]) != 1) 
		GIF_EXIT("Write to file(s) failed."); 
	} 
 
	free((char *) Buffer); 
	fclose(f[0]); 
    } 
    else { 
	unsigned char *Buffers[3]; 
 
	if ((Buffers[0] = (unsigned char *) malloc(ScreenWidth)) == NULL || 
	    (Buffers[1] = (unsigned char *) malloc(ScreenWidth)) == NULL || 
	    (Buffers[2] = (unsigned char *) malloc(ScreenWidth)) == NULL) 
	    GIF_EXIT("Failed to allocate memory required, aborted."); 
 
	for (i = 0; i < ScreenHeight; i++) { 
	    GifRow = ScreenBuffer[i]; 
	    GifQprintf("\b\b\b\b%-4d", ScreenHeight - i); 
	    for (j = 0; j < ScreenWidth; j++) { 
		ColorMapEntry = &ColorMap[GifRow[j]]; 
		Buffers[0][j] = ColorMapEntry -> Red; 
		Buffers[1][j] = ColorMapEntry -> Green; 
		Buffers[2][j] = ColorMapEntry -> Blue; 
	    } 
	    if (fwrite(Buffers[0], ScreenWidth, 1, f[0]) != 1 || 
		fwrite(Buffers[1], ScreenWidth, 1, f[1]) != 1 || 
		fwrite(Buffers[2], ScreenWidth, 1, f[2]) != 1) 
		GIF_EXIT("Write to file(s) failed."); 
	} 
 
	free((char *) Buffers[0]); 
	free((char *) Buffers[1]); 
	free((char *) Buffers[2]); 
	fclose(f[0]); 
	fclose(f[1]); 
	fclose(f[2]); 
    } 
}