Category : C Source Code
Archive   : GIF_LIB.ZIP
Filename : GIFFLIP.C

/*****************************************************************************
* "Gif-Lib" - Yet another gif library. *
* *
* Written by: Gershon Elber IBM PC Ver 0.1, Jul. 1989 *
******************************************************************************
* Program to rotate image 90 degrees to the right/left or flip the image *
* horizintally/vertically (mirror). *
* Options: *
* -r : rotate 90 degrees to the right (default). *
* -l : rotate 90 degrees to the left. *
* -x : Mirror the image horizontally (first line switch places with last). *
* -y : Mirror the image vertically (first column switch places with last). *
* -h : on line help *
******************************************************************************
* History: *
* 10 Jul 89 - Version 1.0 by Gershon Elber. *
*****************************************************************************/

#include
#include
#include
#include
#include
#include "gif_lib.h"
#include "getarg.h"

#define PROGRAM_NAME "GifFlip"
#define VERSION "á Version 1.0, "

enum {
FLIP_NONE,
FLIP_RIGHT,
FLIP_LEFT,
FLIP_HORIZ,
FLIP_VERT
};

extern unsigned int
_stklen = 16384; /* Increase default stack size */

static char
*VersionStr =
PROGRAM_NAME
" IBMPC "
VERSION
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
static char
*CtrlStr =
PROGRAM_NAME
" r%- l%- x%- y%- h%- GifFile!*s";
static char
*ProgramName;

/* Make some variables global, so we could access them faster: */
static int
ImageNum = 0;

static int LoadImage(GifFileType *GifFile, RowType **ImageBuffer);
static int DumpImage(GifFileType *GifFile, RowType *ImageBuffer,
int Width, int Height, int FlipDirection);
static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);

/******************************************************************************
* Interpret the command line and scan the given GIF file. *
******************************************************************************/
void main(int argc, char **argv)
{
int i, Error, NumFiles, ExtCode, FlipDirection,
RightFlag = FALSE, LeftFlag = FALSE,
HorizFlag = FALSE, VertFlag = FALSE, HelpFlag = FALSE;
GifRecordType RecordType;
ByteType *Extension;
char **FileName = NULL;
RowType *ImageBuffer;
GifFileType *GifFileIn = NULL, *GifFileOut = NULL;

if (strlen(ProgramName = argv[0]) == 0) /* DOS 3.x only! */
ProgramName = PROGRAM_NAME; /* Do something reasonable for 2.x */

if ((Error = GAGetArgs(argc, argv, CtrlStr,
&RightFlag, &LeftFlag, &HorizFlag, &VertFlag, &HelpFlag,
&NumFiles, &FileName)) != FALSE ||
(NumFiles > 1 && !HelpFlag)) {
if (Error) GAPrintErrMsg(Error);
else
if (NumFiles > 1)
MESSAGE("Error in command line parsing - one GIF file please\n");
GAPrintHowTo(CtrlStr);
exit(1);
}

if (HelpFlag) {
fprintf(stderr, VersionStr);
GAPrintHowTo(CtrlStr);
exit(0);
}

if ((i = (RightFlag != 0) + (LeftFlag != 0) +
(HorizFlag != 0) + (VertFlag != 0)) > 1)
EXIT("Only one of -r, -l, -x, -y please\n");
if (i == 0) FlipDirection = FLIP_RIGHT; /* Make it the default */
else {
if (RightFlag) FlipDirection = FLIP_RIGHT;
if (LeftFlag) FlipDirection = FLIP_LEFT;
if (HorizFlag) FlipDirection = FLIP_HORIZ;
if (VertFlag) FlipDirection = FLIP_VERT;
}

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);

if (RightFlag || LeftFlag) {
/* Dump out same screen information, but flip Screen Width/Height: */
if (EGifPutScreenDesc(GifFileOut,
GifFileIn -> SHeight, GifFileIn -> SWidth,
GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor,
GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
else {
/* Dump out exactly same screen information: */
if (EGifPutScreenDesc(GifFileOut,
GifFileIn -> SWidth, GifFileIn -> SHeight,
GifFileIn -> SColorResolution, GifFileIn -> SBackGroundColor,
GifFileIn -> SBitsPerPixel, GifFileIn -> SColorMap) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}

/* Scan the content of the GIF file and load the image(s) in: */
do {
if (DGifGetRecordType(GifFileIn, &RecordType) == ERROR)
QuitGifError(GifFileIn, GifFileOut);

switch (RecordType) {
case IMAGE_DESC_RECORD_TYPE:
if (DGifGetImageDesc(GifFileIn) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (GifFileIn -> IInterlace)
EXIT("Cannt flip interlaced images - use GifInter first\n");

/* Put the image descriptor to out file: */
if (RightFlag) {
/* Rotate to the right: */
if (EGifPutImageDesc(GifFileOut,
GifFileIn -> SHeight - GifFileIn -> IHeight -
GifFileIn -> ITop,
GifFileIn -> ILeft,
GifFileIn -> IHeight, GifFileIn -> IWidth,
FALSE, GifFileIn -> IBitsPerPixel,
GifFileIn -> IColorMap) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
else
if (LeftFlag) {
/* Rotate to the left: */
if (EGifPutImageDesc(GifFileOut,
GifFileIn -> ITop,
GifFileIn -> SWidth - GifFileIn -> IWidth -
GifFileIn -> ILeft,
GifFileIn -> IHeight, GifFileIn -> IWidth,
FALSE, GifFileIn -> IBitsPerPixel,
GifFileIn -> IColorMap) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
else {
/* No rotation - only flipping vert. or horiz.: */
if (EGifPutImageDesc(GifFileOut,
GifFileIn -> ILeft, GifFileIn -> ITop,
GifFileIn -> IWidth, GifFileIn -> IHeight,
FALSE, GifFileIn -> IBitsPerPixel,
GifFileIn -> IColorMap) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}

/* Load the image (either Interlaced or not), and dump it */
/* fliped as requrested by Flags: */
if (LoadImage(GifFileIn, &ImageBuffer) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (DumpImage(GifFileOut, ImageBuffer, GifFileIn -> IWidth,
GifFileIn -> IHeight, FlipDirection) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
break;
case EXTENSION_RECORD_TYPE:
/* Skip any extension blocks in file: */
if (DGifGetExtension(GifFileIn, &ExtCode, &Extension) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (EGifPutExtension(GifFileOut, ExtCode, Extension[0],
Extension) == ERROR)
QuitGifError(GifFileIn, GifFileOut);

/* No support to more than one extension blocks, so discard: */
while (Extension != NULL) {
if (DGifGetExtensionNext(GifFileIn, &Extension) == 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) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (EGifCloseFile(GifFileOut) == ERROR)
QuitGifError(GifFileIn, GifFileOut);
}

/******************************************************************************
* Routine to read Image out. The image can be Non interlaced only. *
* The memory required to hold the image is allocate by the routine itself. *
* Return OK if succesful, ERROR otherwise. *
******************************************************************************/
static int LoadImage(GifFileType *GifFile, RowType **ImageBufferPtr)
{
int Size, i;
RowType *ImageBuffer;

/* Allocate the image 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: */
if ((ImageBuffer = (RowType *)
malloc(GifFile -> IHeight * sizeof(RowType *))) == NULL)
EXIT("Failed to allocate memory required, aborted");

Size = GifFile -> IWidth * sizeof(PixelType); /* One row size in bytes */
for (i=0; i IHeight; i++) {
/* Allocate the rows: */
if ((ImageBuffer[i] = (RowType) malloc(Size)) == NULL)
EXIT("Failed to allocate memory required, aborted\n");
}

*ImageBufferPtr = ImageBuffer;

fprintf(stderr, "\n%s: Image %d at (%d, %d) [%dx%d]: ",
ProgramName, ++ImageNum, GifFile -> ILeft, GifFile -> ITop,
GifFile -> IWidth, GifFile -> IHeight);

for (i=0; i IHeight; i++) {
fprintf(stderr, "\b\b\b\b%-4d", i);
if (DGifGetLine(GifFile, ImageBuffer[i], GifFile -> IWidth)
== ERROR) return ERROR;
}

return OK;
}

/******************************************************************************
* Routine to dump image out. The given Image buffer should always hold the *
* image sequencially, and Width & Height hold image dimensions BEFORE flip. *
* Image will be dumped according to FlipDirection. *
* Once dumped, the memory holding the image is freed. *
* Return OK if succesful, ERROR otherwise. *
******************************************************************************/
static int DumpImage(GifFileType *GifFile, RowType *ImageBuffer,
int Width, int Height, int FlipDirection)
{
int i, j, Count;
RowType Line; /* New scan line is copied to it */

/* Allocate scan line that will fit both image width and height: */
if ((Line = (RowType) malloc((Width > Height ? Width : Height)
* sizeof(PixelType))) == NULL)
EXIT("Failed to allocate memory required, aborted\n");

switch (FlipDirection) {
case FLIP_RIGHT:
for (Count=Width, i=0; i fprintf(stderr, "\b\b\b\b%-4d", Count--);
for (j=0; j Line[j] = ImageBuffer[Height - j - 1][i];
if (EGifPutLine(GifFile, Line, Height) == ERROR) return ERROR;
}
break;
case FLIP_LEFT:
for (i=Width-1; i>=0; i--) {
fprintf(stderr, "\b\b\b\b%-4d", i + 1);
for (j=0; j Line[j] = ImageBuffer[j][i];
if (EGifPutLine(GifFile, Line, Height) == ERROR) return ERROR;
}
break;
case FLIP_HORIZ:
for (i=Height-1; i>=0; i--) {
fprintf(stderr, "\b\b\b\b%-4d", i);
if (EGifPutLine(GifFile, ImageBuffer[i], Width) == ERROR)
return ERROR;
}
break;
case FLIP_VERT:
for (Count=Height, i=0; i fprintf(stderr, "\b\b\b\b%-4d", Count--);
for (j=0; j Line[j] = ImageBuffer[i][Width - j - 1];
if (EGifPutLine(GifFile, Line, Width) == ERROR) return ERROR;
}
break;
}

/* Free the memory used for this image, and the temporary scan line: */
for (i=0; i free((char *) ImageBuffer);

free((char *) Line);

return OK;
}

/******************************************************************************
* 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);
}