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

/***************************************************************************** 
*   "Gif-Lib" - Yet another gif library.				     * 
*									     * 
* Written by:  Gershon Elber				Ver 0.1, Jul. 1989   * 
****************************************************************************** 
* Program to reposition GIF file, by changing screen size and/or image(s)    * 
* position. Neither image(s) not colormap(s) are changed by any mean.	     * 
* Options:								     * 
* -q : quite printing mode.						     * 
* -s w h : set new screen size - width & height.			     * 
* -i t l : set new image position - top & left (for first image).	     * 
* -n n w h : set new image position - top & left (for image number n).	     * 
* -h : on line help.							     * 
****************************************************************************** 
* History:								     * 
* 6 Jul 89 - Version 1.0 by Gershon Elber.				     * 
*****************************************************************************/ 
 
#ifdef __MSDOS__ 
#include  
#include  
#endif /* __MSDOS__ */ 
 
#include  
#include  
#include  
#include "gif_lib.h" 
#include "getarg.h" 
 
#define PROGRAM_NAME	"GifPos" 
 
#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 = "GifPos q%- s%-Width|Height!d!d i%-Left|Top!d!d n%-n|Left|Top!d!d!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%-Width|Height!d!d i%-Left|Top!d!d n%-n|Left|Top!d!d!d h%- GifFile!*s"; 
#endif /* SYSV */ 
 
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, 
	ScreenFlag = FALSE, ScreenWidth, ScreenHeight, 
	ImageFlag = FALSE, ImageLeft, ImageTop, 
	ImageNFlag = FALSE, ImageN, ImageNLeft, ImageNTop, 
	HelpFlag = FALSE; 
    GifRecordType RecordType; 
    GifByteType *Extension, *CodeBlock; 
    char **FileName = NULL; 
    GifFileType *GifFileIn = NULL, *GifFileOut = NULL; 
 
    if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint, 
		&ScreenFlag, &ScreenWidth, &ScreenHeight, 
		&ImageFlag, &ImageLeft, &ImageTop, 
		&ImageNFlag, &ImageN, &ImageNLeft, &ImageNTop, 
		&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 (NumFiles == 1) { 
	if ((GifFileIn = DGifOpenFileName(*FileName)) == NULL) 
	    QuitGifError(GifFileIn, GifFileOut); 
    } 
    else { 
	/* Use the stdin instead: */ 
	if ((GifFileIn = DGifOpenFileHandle(0)) == NULL) 
	    QuitGifError(GifFileIn, GifFileOut); 
    } 
 
    /* Open stdout for the output file: */ 
    if ((GifFileOut = EGifOpenFileHandle(1)) == NULL) 
	QuitGifError(GifFileIn, GifFileOut); 
 
    /* And dump out its new possible repositioned screen information: */ 
    if (EGifPutScreenDesc(GifFileOut, 
	ScreenFlag ? ScreenWidth : GifFileIn -> SWidth, 
	ScreenFlag ? ScreenHeight : 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); 
		/* Put possibly repositioned image descriptor to out file: */ 
		if (++ImageNum == 1 && ImageFlag) { 
		    /* First image should be repositioned: */ 
		    if (EGifPutImageDesc(GifFileOut, 
			ImageLeft, ImageTop, 
			GifFileIn -> IWidth, GifFileIn -> IHeight, 
			GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel, 
			GifFileIn -> IColorMap) == GIF_ERROR) 
			QuitGifError(GifFileIn, GifFileOut); 
		} 
		else if (ImageNum == ImageN && ImageNFlag) { 
		    /* Image N should be repositioned: */ 
		    if (EGifPutImageDesc(GifFileOut, 
			ImageNLeft, ImageNTop, 
			GifFileIn -> IWidth, GifFileIn -> IHeight, 
			GifFileIn -> IInterlace, GifFileIn -> IBitsPerPixel, 
			GifFileIn -> IColorMap) == GIF_ERROR) 
			QuitGifError(GifFileIn, GifFileOut); 
		} 
		else { 
		    /* No repositioning for this image: */ 
		    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 || 
		    EGifPutCode(GifFileOut, CodeSize, CodeBlock) == GIF_ERROR) 
		    QuitGifError(GifFileIn, GifFileOut); 
		while (CodeBlock != NULL) { 
		    if (DGifGetCodeNext(GifFileIn, &CodeBlock) == GIF_ERROR || 
			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 (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 (EGifCloseFile(GifFileOut) == GIF_ERROR) 
	QuitGifError(GifFileIn, GifFileOut); 
} 
 
/****************************************************************************** 
* 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); 
}