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rgb2gif.c

/*****************************************************************************
*   "Gif-Lib" - Yet another gif library.                         *
*                                                          *
* Written by:  Gershon Elber                    Ver 0.1, Jun. 1991   *
******************************************************************************
* Program to convert 24bits RGB files to GIF format.                   *
* Options:                                                 *
* -q : quiet printing mode.                                      *
* -c #colors : in power of two, i.e. 7 will allow upto 128 colors in output. *
* -1 : one file holding RGBRGB.. triples of bytes                      *
* -s Width Height : specifies size of raw image.                             *
* -h : on-line help.                                             *
******************************************************************************
* History:                                                 *
* 15 Jun 91 - Version 1.0 by Gershon Elber.                            *
*****************************************************************************/

#ifdef __MSDOS__
#include <graphics.h>
#include <stdlib.h>
#include <alloc.h>
#include <io.h>
#include <dos.h>
#include <bios.h>
#endif /* __MSDOS__ */

#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <fcntl.h>
#include "gif_lib.h"
#include "gagetarg.h"

#define PROGRAM_NAME    "RGB2Gif"

#ifdef __MSDOS__
extern unsigned int
    _stklen = 16384;                     /* Increase default stack size. */
#endif /* __MSDOS__ */

#ifdef SYSV
static char *VersionStr =
      "Gif toolkit module,\t\tGershon Elber\n\
      (C) Copyright 1989 Gershon Elber.\n";
static char
    *CtrlStr = "RGB2Gif q%- c%-#Colors!d 1%- s!-Width|Height!d!d h%- RGBFile!*s";
#else
static char
    *VersionStr =
      PROGRAM_NAME
      GIF_LIB_VERSION
      "     Gershon Elber,    "
      __DATE__ ",   " __TIME__ "\n"
      "(C) Copyright 1989 Gershon Elber.\n";
static char
    *CtrlStr =
      PROGRAM_NAME
      " q%- c%-#Colors!d 1%- s!-Width|Height!d!d h%- RGBFile!*s";
#endif /* SYSV */

/* Make some variables global, so we could access them faster: */
static int
    ColorFlag = FALSE,
    ExpNumOfColors = 8,
    OneFileFlag = FALSE,
    HelpFlag = FALSE,
    ColorMapSize = 256;

static void LoadRGB(char *FileName,
                int OneFileFlag,
                GifByteType **RedBuffer,
                GifByteType **GreenBuffer,
                GifByteType **BlueBuffer,
                int Width, int Height);
static void SaveGif(GifByteType *OutputBuffer,
                ColorMapObject *OutputColorMap,
                int ExpColorMapSize, int Width, int Height);
static void QuitGifError(GifFileType *GifFile);

/******************************************************************************
* Interpret the command line and scan the given GIF file.               *
******************************************************************************/
void main(int argc, char **argv)
{
    int     Error, NumFiles, Width, Height, SizeFlag;
    char **FileName = NULL;
    GifByteType *RedBuffer = NULL, *GreenBuffer = NULL, *BlueBuffer = NULL,
      *OutputBuffer = NULL;
    ColorMapObject *OutputColorMap = NULL;

    if ((Error = GAGetArgs(argc, argv, CtrlStr, &GifQuietPrint,
            &ColorFlag, &ExpNumOfColors, &OneFileFlag,
            &SizeFlag, &Width, &Height, &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);
    }

    ColorMapSize = 1 << ExpNumOfColors;

    if (NumFiles == 1) {
      LoadRGB(*FileName, OneFileFlag,
            &RedBuffer, &GreenBuffer, &BlueBuffer, Width, Height);
    }
    else {
      LoadRGB(NULL, OneFileFlag,
            &RedBuffer, &GreenBuffer, &BlueBuffer, Width, Height);
    }

    if ((OutputColorMap = MakeMapObject(ColorMapSize, NULL)) == NULL ||
      (OutputBuffer = (GifByteType *) malloc(Width * Height *
                                  sizeof(GifByteType))) == NULL)
      GIF_EXIT("Failed to allocate memory required, aborted.");

    if (QuantizeBuffer(Width, Height, &ColorMapSize,
                   RedBuffer, GreenBuffer, BlueBuffer,
                   OutputBuffer, OutputColorMap->Colors) == GIF_ERROR)
      QuitGifError(NULL);
    free((char *) RedBuffer);
    free((char *) GreenBuffer);
    free((char *) BlueBuffer);

    SaveGif(OutputBuffer, OutputColorMap, ExpNumOfColors, Width, Height);
}

/******************************************************************************
* Load RGB file into internal frame buffer.                             *
******************************************************************************/
static void LoadRGB(char *FileName,
                int OneFileFlag,
                GifByteType **RedBuffer,
                GifByteType **GreenBuffer,
                GifByteType **BlueBuffer,
                int Width, int Height)
{
    int i, j;
    unsigned long Size;
    GifByteType *RedP, *GreenP, *BlueP;
    FILE *f[3];

    Size = ((long) Width) * Height * sizeof(GifByteType);
#ifdef __MSDOS__
    if (Size > 65500L)
      GIF_EXIT("Can't allocate more than 64k.");
#endif /* __MSDOS__ */

    if ((*RedBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL ||
      (*GreenBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL ||
      (*BlueBuffer = (GifByteType *) malloc((unsigned int) Size)) == NULL)
      GIF_EXIT("Failed to allocate memory required, aborted.");

    RedP = *RedBuffer;
    GreenP = *GreenBuffer;
    BlueP = *BlueBuffer;

    if (FileName != NULL) {
      char OneFileName[80];

      if (OneFileFlag) {
#ifdef __MSDOS__
          if ((f[0] = fopen(FileName, "rb")) == NULL)
#else
          if ((f[0] = fopen(FileName, "r")) == NULL)
#endif /* __MSDOS__ */
            GIF_EXIT("Can't open input file name.");
      }
      else {
          static char *Postfixes[] = { ".R", ".G", ".B" };

          for (i = 0; i < 3; i++) {
            strcpy(OneFileName, FileName);
            strcat(OneFileName, Postfixes[i]);

#ifdef __MSDOS__
            if ((f[i] = fopen(OneFileName, "rb")) == NULL)
#else
            if ((f[i] = fopen(OneFileName, "r")) == NULL)
#endif /* __MSDOS__ */
                GIF_EXIT("Can't open input file name.");
          }
      }
    }
    else {
      OneFileFlag = TRUE;

#ifdef __MSDOS__
      setmode(0, O_BINARY);
#endif /* __MSDOS__ */

      f[0] = stdin;
    }

    GifQprintf("\n%s: RGB image:     ", PROGRAM_NAME);

    if (OneFileFlag) {
      GifByteType *Buffer, *BufferP;

      if ((Buffer = (GifByteType *) malloc(Width * 3)) == NULL)
          GIF_EXIT("Failed to allocate memory required, aborted.");

      for (i = 0; i < Height; i++) {
          GifQprintf("\b\b\b\b%-4d", i);
          if (fread(Buffer, Width * 3, 1, f[0]) != 1)
            GIF_EXIT("Input file(s) terminated prematurly.");
          for (j = 0, BufferP = Buffer; j < Width; j++) {
            *RedP++ = *BufferP++;
            *GreenP++ = *BufferP++;
            *BlueP++ = *BufferP++;
          }
      }

      free((char *) Buffer);
      fclose(f[0]);
    }
    else {
      for (i = 0; i < Height; i++) {
          GifQprintf("\b\b\b\b%-4d", i);
          if (fread(RedP, Width, 1, f[0]) != 1 ||
            fread(GreenP, Width, 1, f[1]) != 1 ||
            fread(BlueP, Width, 1, f[2]) != 1)
            GIF_EXIT("Input file(s) terminated prematurly.");
          RedP += Width;
          GreenP += Width;
          BlueP += Width;
      }

      fclose(f[0]);
      fclose(f[1]);
      fclose(f[2]);
    }
}

/******************************************************************************
* Save the GIF resulting image.                                         *
******************************************************************************/
static void SaveGif(GifByteType *OutputBuffer,
                ColorMapObject *OutputColorMap,
                int ExpColorMapSize, int Width, int Height)
{
    int i;
    GifFileType *GifFile;
    GifByteType *Ptr = OutputBuffer;

    /* Open stdout for the output file: */
    if ((GifFile = EGifOpenFileHandle(1)) == NULL)
      QuitGifError(GifFile);

    if (EGifPutScreenDesc(GifFile,
                    Width, Height, ExpColorMapSize, 0,
                    OutputColorMap) == GIF_ERROR ||
      EGifPutImageDesc(GifFile,
                   0, 0, Width, Height, FALSE, NULL) ==
                                                                   GIF_ERROR)
      QuitGifError(GifFile);

    GifQprintf("\n%s: Image 1 at (%d, %d) [%dx%d]:     ",
             PROGRAM_NAME, GifFile->Image.Left, GifFile->Image.Top,
             GifFile->Image.Width, GifFile->Image.Height);

    for (i = 0; i < Height; i++) {
      if (EGifPutLine(GifFile, Ptr, Width) == GIF_ERROR)
          QuitGifError(GifFile);
      GifQprintf("\b\b\b\b%-4d", Height - i - 1);

      Ptr += Width;
    }

    if (EGifCloseFile(GifFile) == GIF_ERROR)
      QuitGifError(GifFile);
}

/******************************************************************************
* Close output file (if open), and exit.                          *
******************************************************************************/
static void QuitGifError(GifFileType *GifFile)
{
    PrintGifError();
    if (GifFile != NULL) EGifCloseFile(GifFile);
    exit(1);
}

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