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G/UTIL/RGB2GIF.C
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292
G/UTIL/RGB2GIF.C
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/*****************************************************************************
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* "Gif-Lib" - Yet another gif library. *
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* *
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* Written by: Gershon Elber Ver 0.1, Jun. 1991 *
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******************************************************************************
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* Program to convert 24bits RGB files to GIF format. *
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* Options: *
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* -q : quite printing mode. *
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* -c #colors : in power of two, i.e. 7 will allow upto 128 colors in output. *
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* -1 : one file holding RGBRGB.. triples of bytes *
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* -s Width Height : specifies size of raw image. *
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* -h : on line help. *
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******************************************************************************
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* History: *
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* 15 Jun 91 - Version 1.0 by Gershon Elber. *
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*****************************************************************************/
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#ifdef __MSDOS__
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#include <graphics.h>
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#include <stdlib.h>
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#include <alloc.h>
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#include <io.h>
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#include <dos.h>
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#include <bios.h>
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#endif /* __MSDOS__ */
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <fcntl.h>
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#include "gif_lib.h"
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#include "getarg.h"
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#define PROGRAM_NAME "RGB2Gif"
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#ifdef __MSDOS__
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extern unsigned int
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_stklen = 16384; /* Increase default stack size. */
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#endif /* __MSDOS__ */
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#ifdef SYSV
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static char *VersionStr =
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"Gif library module,\t\tGershon Elber\n\
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(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
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static char
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*CtrlStr = "RGB2Gif q%- c%-#Colors!d 1%- s!-Width|Height!d!d h%- RGBFile!*s";
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#else
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static char
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*VersionStr =
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PROGRAM_NAME
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GIF_LIB_VERSION
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" Gershon Elber, "
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__DATE__ ", " __TIME__ "\n"
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"(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
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static char
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*CtrlStr =
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PROGRAM_NAME
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" q%- c%-#Colors!d 1%- s!-Width|Height!d!d h%- RGBFile!*s";
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#endif /* SYSV */
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/* Make some variables global, so we could access them faster: */
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static int
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ColorFlag = FALSE,
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ExpNumOfColors = 8,
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OneFileFlag = FALSE,
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HelpFlag = FALSE,
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ColorMapSize = 256;
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static void LoadRGB(char *FileName,
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int OneFileFlag,
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GifByteType **RedBuffer,
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GifByteType **GreenBuffer,
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GifByteType **BlueBuffer,
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int Width, int Height);
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static void SaveGif(GifByteType *OutputBuffer,
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GifColorType *OutputColorMap,
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int ExpColorMapSize, int Width, int Height);
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static void QuitGifError(GifFileType *GifFile);
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/******************************************************************************
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* Interpret the command line and scan the given GIF file. *
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******************************************************************************/
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void main(int argc, char **argv)
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{
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int Error, NumFiles, Width, Height, SizeFlag;
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char **FileName = NULL;
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GifByteType *RedBuffer = NULL, *GreenBuffer = NULL, *BlueBuffer = NULL,
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*OutputBuffer = NULL;
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GifColorType *OutputColorMap = NULL;
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if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuitePrint,
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&ColorFlag, &ExpNumOfColors, &OneFileFlag,
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&SizeFlag, &Width, &Height, &HelpFlag,
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&NumFiles, &FileName)) != FALSE ||
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(NumFiles > 1 && !HelpFlag)) {
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if (Error)
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GAPrintErrMsg(Error);
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else if (NumFiles > 1)
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GIF_MESSAGE("Error in command line parsing - one GIF file please.");
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GAPrintHowTo(CtrlStr);
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exit(1);
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}
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if (HelpFlag) {
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fprintf(stderr, VersionStr);
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GAPrintHowTo(CtrlStr);
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exit(0);
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}
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ColorMapSize = 1 << ExpNumOfColors;
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if (NumFiles == 1) {
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LoadRGB(*FileName, OneFileFlag,
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&RedBuffer, &GreenBuffer, &BlueBuffer, Width, Height);
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}
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else {
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LoadRGB(NULL, OneFileFlag,
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&RedBuffer, &GreenBuffer, &BlueBuffer, Width, Height);
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}
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if ((OutputColorMap = (GifColorType *) malloc(ColorMapSize *
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sizeof(GifColorType))) == NULL ||
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(OutputBuffer = (GifByteType *) malloc(Width * Height *
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sizeof(GifByteType))) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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if (QuantizeBuffer(Width, Height, &ColorMapSize,
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RedBuffer, GreenBuffer, BlueBuffer,
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OutputBuffer, OutputColorMap) == GIF_ERROR)
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QuitGifError(NULL);
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free((char *) RedBuffer);
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free((char *) GreenBuffer);
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free((char *) BlueBuffer);
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SaveGif(OutputBuffer, OutputColorMap, ExpNumOfColors, Width, Height);
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}
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/******************************************************************************
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* Load RGB file into internal frame buffer. *
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******************************************************************************/
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static void LoadRGB(char *FileName,
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int OneFileFlag,
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GifByteType **RedBuffer,
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GifByteType **GreenBuffer,
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GifByteType **BlueBuffer,
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int Width, int Height)
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{
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int i, j;
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unsigned long Size;
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GifByteType *RedP, *GreenP, *BlueP;
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FILE *f[3];
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Size = ((long) Width) * Height * sizeof(GifByteType);
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#ifdef __MSDOS__
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if (Size > 65500L)
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GIF_EXIT("Can't allocate more than 64k.");
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#endif /* __MSDOS__ */
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if ((*RedBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL ||
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(*GreenBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL ||
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(*BlueBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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RedP = *RedBuffer;
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GreenP = *GreenBuffer;
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BlueP = *BlueBuffer;
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if (FileName != NULL) {
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char OneFileName[80];
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if (OneFileFlag) {
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#ifdef __MSDOS__
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if ((f[0] = fopen(FileName, "rb")) == NULL)
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#else
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if ((f[0] = fopen(FileName, "r")) == NULL)
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#endif /* __MSDOS__ */
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GIF_EXIT("Can't open input file name.");
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}
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else {
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static char *Postfixes[] = { ".R", ".G", ".B" };
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for (i = 0; i < 3; i++) {
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strcpy(OneFileName, FileName);
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strcat(OneFileName, Postfixes[i]);
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#ifdef __MSDOS__
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if ((f[i] = fopen(OneFileName, "rb")) == NULL)
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#else
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if ((f[i] = fopen(OneFileName, "r")) == NULL)
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#endif /* __MSDOS__ */
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GIF_EXIT("Can't open input file name.");
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}
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}
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}
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else {
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OneFileFlag = TRUE;
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#ifdef __MSDOS__
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setmode(0, O_BINARY);
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#endif /* __MSDOS__ */
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f[0] = stdin;
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}
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GifQprintf("\n%s: RGB image: ", PROGRAM_NAME);
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if (OneFileFlag) {
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GifByteType *Buffer, *BufferP;
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if ((Buffer = (GifByteType *) malloc(Width * 3)) == NULL)
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GIF_EXIT("Failed to allocate memory required, aborted.");
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for (i = 0; i < Height; i++) {
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GifQprintf("\b\b\b\b%-4d", i);
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if (fread(Buffer, Width * 3, 1, f[0]) != 1)
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GIF_EXIT("Input file(s) terminated prematurly.");
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for (j = 0, BufferP = Buffer; j < Width; j++) {
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*RedP++ = *BufferP++;
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*GreenP++ = *BufferP++;
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*BlueP++ = *BufferP++;
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}
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}
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free((char *) Buffer);
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fclose(f[0]);
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}
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else {
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for (i = 0; i < Height; i++) {
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GifQprintf("\b\b\b\b%-4d", i);
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if (fread(RedP, Width, 1, f[0]) != 1 ||
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fread(GreenP, Width, 1, f[1]) != 1 ||
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fread(BlueP, Width, 1, f[2]) != 1)
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GIF_EXIT("Input file(s) terminated prematurly.");
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RedP += Width;
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GreenP += Width;
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BlueP += Width;
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}
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fclose(f[0]);
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fclose(f[1]);
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fclose(f[2]);
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}
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}
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/******************************************************************************
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* Save the GIF resulting image. *
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******************************************************************************/
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static void SaveGif(GifByteType *OutputBuffer,
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GifColorType *OutputColorMap,
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int ExpColorMapSize, int Width, int Height)
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{
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int i;
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GifFileType *GifFile;
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GifByteType *Ptr = OutputBuffer;
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/* Open stdout for the output file: */
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if ((GifFile = EGifOpenFileHandle(1)) == NULL)
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QuitGifError(GifFile);
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if (EGifPutScreenDesc(GifFile,
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Width, Height, ExpColorMapSize, 0, ExpColorMapSize,
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OutputColorMap) == GIF_ERROR ||
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EGifPutImageDesc(GifFile,
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0, 0, Width, Height, FALSE, ExpColorMapSize, NULL) ==
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GIF_ERROR)
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QuitGifError(GifFile);
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GifQprintf("\n%s: Image 1 at (%d, %d) [%dx%d]: ",
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PROGRAM_NAME, GifFile -> ILeft, GifFile -> ITop,
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GifFile -> IWidth, GifFile -> IHeight);
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for (i = 0; i < Height; i++) {
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if (EGifPutLine(GifFile, Ptr, Width) == GIF_ERROR)
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QuitGifError(GifFile);
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GifQprintf("\b\b\b\b%-4d", Height - i - 1);
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Ptr += Width;
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}
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if (EGifCloseFile(GifFile) == GIF_ERROR)
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QuitGifError(GifFile);
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}
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/******************************************************************************
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* Close output file (if open), and exit. *
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******************************************************************************/
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static void QuitGifError(GifFileType *GifFile)
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{
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PrintGifError();
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if (GifFile != NULL) EGifCloseFile(GifFile);
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exit(1);
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}
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