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

/***************************************************************************** 
*   "Gif-Lib" - Yet another gif library.				     * 
*									     * 
* Written by:  Gershon Elber				Ver 0.1, Aug. 1991   * 
****************************************************************************** 
* Program to rotate a GIF image by an arbitrary angle.			     * 
* Options:								     * 
* -q : quite printing mode.						     * 
* -a Angle : angle to rotate with respect to the X axis.		     * 
* -s Width Height : specifies size of output image.                          * 
* -h : on line help.							     * 
****************************************************************************** 
* History:								     * 
*  2 Aug 91 - Version 1.0 by Gershon Elber.				     * 
*****************************************************************************/ 
 
#ifdef __MSDOS__ 
#include  
#include  
#include  
#include  
#include  
#include  
#endif /* __MSDOS__ */ 
 
#include  
#include  
#include  
#include  
#include  
#include "gif_lib.h" 
#include "getarg.h" 
 
#ifndef M_PI 
#define M_PI        3.14159265358979323846 
#endif /* M_PI */ 
 
#define PROGRAM_NAME	"GifRotat" 
 
#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 = "GifRotat a!-Angle!d q%- s%-Width|Height!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 
	" a!-Angle!d q%- s%-Width|Height!d!d h%- GifFile!*s"; 
#endif /* SYSV */ 
 
static int 
    InterlacedOffset[] = { 0, 4, 2, 1 }, /* The way Interlaced image should. */ 
    InterlacedJumps[] = { 8, 8, 4, 2 };    /* be read - offsets and jumps... */ 
 
static void RotateGifImage(GifRowType *ScreenBuffer, GifFileType *SrcGifFile, 
			   int Angle, GifColorType *ColorMap, 
			   int ExpColorMapSize, int DstWidth, int DstHeight); 
static void RotateGifLine(GifRowType *ScreenBuffer, int BackGroundColor, 
			  int SrcWidth, int SrcHeight, 
			  int Angle, GifRowType DstLine, 
			  int DstWidth, int DstHeight, int y); 
static void QuitGifError(GifFileType *DstGifFile); 
 
/****************************************************************************** 
* Interpret the command line and scan the given GIF file.		      * 
******************************************************************************/ 
void main(int argc, char **argv) 
{ 
    int	i, j, Size, Error, NumFiles, Col, Row, Count, ExtCode, 
	ExpColorMapSize, DstWidth, DstHeight, Width, Height, 
	ImageNum = 0, 
	DstSizeFlag = FALSE, 
	AngleFlag = FALSE, 
	Angle = 0, 
	HelpFlag = FALSE; 
    char **FileName = NULL; 
    GifRecordType RecordType; 
    GifByteType *Extension; 
    GifFileType *GifFile; 
    GifRowType *ScreenBuffer; 
    GifColorType *ColorMap = NULL; 
 
    if ((Error = GAGetArgs(argc, argv, CtrlStr, 
		&AngleFlag, &Angle, &GifQuitePrint, 
		&DstSizeFlag, &DstWidth, &DstHeight, &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 ((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); 
 
    ColorMap = (GifFile -> IColorMap ? GifFile -> IColorMap : 
				       GifFile -> SColorMap); 
    ExpColorMapSize = GifFile -> IColorMap ? GifFile -> IBitsPerPixel : 
					     GifFile -> SBitsPerPixel; 
 
    if (!DstSizeFlag) { 
	DstWidth = GifFile -> SWidth; 
	DstHeight = GifFile -> SHeight; 
    } 
 
    /* Perform the actual rotation and dump the image: */ 
    RotateGifImage(ScreenBuffer, GifFile, Angle, ColorMap, ExpColorMapSize, 
		   DstWidth, DstHeight); 
} 
 
/****************************************************************************** 
* Save the GIF resulting image.						      * 
******************************************************************************/ 
static void RotateGifImage(GifRowType *ScreenBuffer, GifFileType *SrcGifFile, 
			   int Angle, GifColorType *ColorMap, 
			   int ExpColorMapSize, int DstWidth, int DstHeight) 
{ 
    int i, 
	LineSize = DstWidth * sizeof(GifPixelType); 
    GifFileType *DstGifFile; 
    GifRowType LineBuffer; 
 
    if ((LineBuffer = (GifRowType) malloc(LineSize)) == NULL) 
	GIF_EXIT("Failed to allocate memory required, aborted."); 
 
    /* Open stdout for the output file: */ 
    if ((DstGifFile = EGifOpenFileHandle(1)) == NULL) 
	QuitGifError(DstGifFile); 
 
    if (EGifPutScreenDesc(DstGifFile, DstWidth, DstHeight, 
			  ExpColorMapSize, 0, ExpColorMapSize, 
			  ColorMap) == GIF_ERROR || 
	EGifPutImageDesc(DstGifFile, 0, 0, DstWidth, DstHeight, 
			 FALSE, ExpColorMapSize, NULL) == GIF_ERROR) 
	QuitGifError(DstGifFile); 
 
    for (i = 0; i < DstHeight; i++) { 
	RotateGifLine(ScreenBuffer, SrcGifFile -> SBackGroundColor, 
		      SrcGifFile -> SWidth, SrcGifFile -> SHeight, 
		      Angle, LineBuffer, DstWidth, DstHeight, i); 
	if (EGifPutLine(DstGifFile, LineBuffer, DstWidth) == GIF_ERROR) 
	    QuitGifError(DstGifFile); 
	GifQprintf("\b\b\b\b%-4d", DstHeight - i - 1); 
    } 
 
    if (EGifCloseFile(DstGifFile) == GIF_ERROR) 
	QuitGifError(DstGifFile); 
} 
 
 
/****************************************************************************** 
* Save the GIF resulting image.						      * 
******************************************************************************/ 
static void RotateGifLine(GifRowType *ScreenBuffer, int BackGroundColor, 
		          int SrcWidth, int SrcHeight, 
			  int Angle, GifRowType DstLine, 
			  int DstWidth, int DstHeight, int y) 
{ 
    int x, 
	TransSrcX = SrcWidth / 2, 
	TransSrcY = SrcHeight / 2, 
	TransDstX = DstWidth / 2, 
	TransDstY = DstHeight / 2; 
    double SinAngle = sin(Angle * M_PI / 180.0), 
	   CosAngle = cos(Angle * M_PI / 180.0); 
 
    for (x = 0; x < DstWidth; x++) 
    { 
	int xc = x - TransDstX, 
	    yc = y - TransDstY, 
	    SrcX = xc * CosAngle - yc * SinAngle + TransSrcX, 
	    SrcY = xc * SinAngle + yc * CosAngle + TransSrcY; 
 
	if (SrcX < 0 || SrcX >= SrcWidth || 
	    SrcY < 0 || SrcY >= SrcHeight) 
	{ 
	    /* Out of the source image domain - set it to background color. */ 
	    *DstLine++ = BackGroundColor; 
	} 
	else 
	    *DstLine++ = ScreenBuffer[SrcY][SrcX]; 
    } 
} 
 
/****************************************************************************** 
* Close output file (if open), and exit.				      * 
******************************************************************************/ 
static void QuitGifError(GifFileType *DstGifFile) 
{ 
    PrintGifError(); 
    if (DstGifFile != NULL) EGifCloseFile(DstGifFile); 
    exit(1); 
}