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- /*****************************************************************************
- * "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 <stdio.h>
- #include <stdlib.h>
- #include <ctype.h>
- #include <alloc.h>
- #include <string.h>
- #include "gif_lib.h"
- #include "getarg.h"
-
- #define PROGRAM_NAME "GifFlip"
- #define VERSION "ß 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<GifFile -> 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<GifFile -> 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<Width; i++) {
- fprintf(stderr, "\b\b\b\b%-4d", Count--);
- for (j=0; j<Height; 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<Height; 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<Height; i++) {
- fprintf(stderr, "\b\b\b\b%-4d", Count--);
- for (j=0; j<Width; 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<Height; i++) free((char *) ImageBuffer[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);
- }
-