/*****************************************************************************
* "Gif-Lib" - Yet another gif library.
*
* Written by: Gershon Elber Ver 0.1, Jul. 1989
******************************************************************************
* Program to rotate image 90 degrees to the right/left or flip the image
* horizontally/vertically (mirror).
* Options:
* -v : verbose mode.
* -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 <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdbool.h>
#include "gif_lib.h"
#include "getarg.h"
#define PROGRAM_NAME "gifflip"
#define FLIP_NONE 0
#define FLIP_RIGHT 1
#define FLIP_LEFT 2
#define FLIP_HORIZ 3
#define FLIP_VERT 4
static char
*VersionStr =
PROGRAM_NAME
VERSION_COOKIE
" Gershon Elber, "
__DATE__ ", " __TIME__ "\n"
"(C) Copyright 1989 Gershon Elber.\n";
static char
*CtrlStr =
PROGRAM_NAME
" v%- r%- l%- x%- y%- h%- GifFile!*s";
/* Make some variables global, so we could access them faster: */
static int
ImageNum = 0;
static int LoadImage(GifFileType *GifFile, GifRowType **ImageBuffer);
static int DumpImage(GifFileType *GifFile, GifRowType *ImageBuffer,
int Width, int Height, int FlipDirection);
static void QuitGifError(GifFileType *GifFileIn, GifFileType *GifFileOut);
/******************************************************************************
* Interpret the command line and scan the given GIF file.
******************************************************************************/
int main(int argc, char **argv)
{
int i, NumFiles, ExtCode, FlipDirection = FLIP_RIGHT;
bool Error,
RightFlag = false, LeftFlag = false,
HorizFlag = false, VertFlag = false, HelpFlag = false;
GifRecordType RecordType;
GifByteType *Extension;
char **FileName = NULL;
GifRowType *ImageBuffer;
GifFileType *GifFileIn = NULL, *GifFileOut = NULL;
if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifNoisyPrint,
&RightFlag, &LeftFlag, &HorizFlag, &VertFlag, &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(EXIT_FAILURE);
}
if (HelpFlag) {
(void)fprintf(stderr, VersionStr, GIFLIB_MAJOR, GIFLIB_MINOR);
GAPrintHowTo(CtrlStr);
exit(EXIT_SUCCESS);
}
if ((i = (RightFlag != 0) + (LeftFlag != 0) +
(HorizFlag != 0) + (VertFlag != 0)) > 1)
GIF_EXIT("Only one of -r, -l, -x, -y please.");
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->SColorMap) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
else {
/* Dump out exactly same screen information: */
if (EGifPutScreenDesc(GifFileOut,
GifFileIn->SWidth, GifFileIn->SHeight,
GifFileIn->SColorResolution, GifFileIn->SBackGroundColor,
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 (GifFileIn->Image.Interlace)
GIF_EXIT("Cannt flip interlaced images - use GifInter first.");
/* Put the image descriptor to out file: */
if (RightFlag) {
/* Rotate to the right: */
if (EGifPutImageDesc(GifFileOut,
GifFileIn->SHeight - GifFileIn->Image.Height -
GifFileIn->Image.Top,
GifFileIn->Image.Left,
GifFileIn->Image.Height, GifFileIn->Image.Width,
false, GifFileIn->Image.ColorMap) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
else if (LeftFlag) {
/* Rotate to the left: */
if (EGifPutImageDesc(GifFileOut,
GifFileIn->Image.Top,
GifFileIn->SWidth - GifFileIn->Image.Width -
GifFileIn->Image.Left,
GifFileIn->Image.Height, GifFileIn->Image.Width,
false, GifFileIn->Image.ColorMap) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
else {
/* No rotation - only flipping vert. or horiz.: */
if (EGifPutImageDesc(GifFileOut,
GifFileIn->Image.Left, GifFileIn->Image.Top,
GifFileIn->Image.Width, GifFileIn->Image.Height,
false, GifFileIn->Image.ColorMap) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
}
/* Load the image (either Interlaced or not), and dump it */
/* fliped as requrested by Flags: */
if (LoadImage(GifFileIn, &ImageBuffer) == GIF_ERROR)
QuitGifError(GifFileIn, GifFileOut);
if (DumpImage(GifFileOut, ImageBuffer, GifFileIn->Image.Width,
GifFileIn->Image.Height, FlipDirection) == 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);
return 0;
}
/******************************************************************************
* 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 GIF_OK if succesful, GIF_ERROR otherwise.
******************************************************************************/
static int LoadImage(GifFileType *GifFile, GifRowType **ImageBufferPtr)
{
int Size, i;
GifRowType *ImageBuffer;
/* Allocate the image as vector of column of rows */
if ((ImageBuffer = (GifRowType *)
malloc(GifFile->Image.Height * sizeof(GifRowType))) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
Size = GifFile->Image.Width * sizeof(GifPixelType);/* One row size in bytes.*/
for (i = 0; i < GifFile->Image.Height; i++) {
/* Allocate the rows: */
if ((ImageBuffer[i] = (GifRowType) malloc(Size)) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
}
*ImageBufferPtr = ImageBuffer;
GifQprintf("\n%s: Image %d at (%d, %d) [%dx%d]: ",
PROGRAM_NAME, ++ImageNum, GifFile->Image.Left, GifFile->Image.Top,
GifFile->Image.Width, GifFile->Image.Height);
for (i = 0; i < GifFile->Image.Height; i++) {
GifQprintf("\b\b\b\b%-4d", i);
if (DGifGetLine(GifFile, ImageBuffer[i], GifFile->Image.Width)
== GIF_ERROR) return GIF_ERROR;
}
return GIF_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 GIF_OK if succesful, GIF_ERROR otherwise.
******************************************************************************/
static int DumpImage(GifFileType *GifFile, GifRowType *ImageBuffer,
int Width, int Height, int FlipDirection)
{
int i, j, Count;
GifRowType Line; /* New scan line is copied to it. */
/* Allocate scan line that will fit both image width and height: */
if ((Line = (GifRowType) malloc((Width > Height ? Width : Height)
* sizeof(GifPixelType))) == NULL)
GIF_EXIT("Failed to allocate memory required, aborted.");
switch (FlipDirection) {
case FLIP_RIGHT:
for (Count = Width, i = 0; i < Width; i++) {
GifQprintf("\b\b\b\b%-4d", Count--);
for (j = 0; j < Height; j++)
Line[j] = ImageBuffer[Height - j - 1][i];
if (EGifPutLine(GifFile, Line, Height) == GIF_ERROR) {
free(Line);
return GIF_ERROR;
}
}
break;
case FLIP_LEFT:
for (i = Width - 1; i >= 0; i--) {
GifQprintf("\b\b\b\b%-4d", i + 1);
for (j = 0; j < Height; j++)
Line[j] = ImageBuffer[j][i];
if (EGifPutLine(GifFile, Line, Height) == GIF_ERROR) {
free(Line);
return GIF_ERROR;
}
}
break;
case FLIP_HORIZ:
for (i = Height - 1; i >= 0; i--) {
GifQprintf("\b\b\b\b%-4d", i);
if (EGifPutLine(GifFile, ImageBuffer[i], Width) == GIF_ERROR) {
free(Line);
return GIF_ERROR;
}
}
break;
case FLIP_VERT:
for (Count = Height, i = 0; i < Height; i++) {
GifQprintf("\b\b\b\b%-4d", Count--);
for (j = 0; j < Width; j++)
Line[j] = ImageBuffer[i][Width - j - 1];
if (EGifPutLine(GifFile, Line, Width) == GIF_ERROR) {
free(Line);
return GIF_ERROR;
}
}
break;
}
/* Free the memory used for this image, and the temporary scan line: */
for (i = 0; i < Height; i++) free((char *) ImageBuffer[i]);
free((char *) ImageBuffer);
free((char *) Line);
return GIF_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(EXIT_FAILURE);
}