Logo Search packages:      
Sourcecode: giflib version File versions  Download package

dev2gif.c

/*****************************************************************************
*   "Gif-Lib" - Yet another gif library.                         *
*                                                          *
* Written by:  Gershon Elber              IBM PC Ver 1.1,   Jun. 1989    *
******************************************************************************
* Module to dump graphic devices into a GIF file. Current supported devices: *
* 1. EGA, VGA, SVGA (800x600), Hercules on the IBM PC (#define __MSDOS__).   *
* 2. SGI 4D Irix using gl library (#define __SGI_GL__).                      *
* 3. X11 using libX.a (#define __X11__).                         *
******************************************************************************
* History:                                                 *
* 22 Jun 89 - Version 1.0 by Gershon Elber.                            *
* 12 Aug 90 - Version 1.1 by Gershon Elber (added devices).            *
*****************************************************************************/

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

#ifdef __SGI_GL__
#include <gl/gl.h>
#endif /* __SGI_GL__ */

#ifdef __X11__
#include <X11/Xlib.h>
#endif /* __X11__ */

#include <stdio.h>
#include "gif_lib.h"

#define PROGRAM_NAME    "GIF_LIBRARY"

#define SVGA_SPECIAL    999                /* 800 by 600 Super VGA mode. */

static int GraphDriver = -1,       /* Device parameters - reasonable values. */
         GraphMode = -1,
         ScreenColorBits = 1;
static long ScreenXMax = 100,
          ScreenYMax = 100;
static unsigned int ScreenBase;

#ifdef SYSV
static char *VersionStr =
        "Gif library module,\t\tGershon Elber\n\
      (C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
#else
static char *VersionStr =
      PROGRAM_NAME
      "     IBMPC "
      GIF_LIB_VERSION
      "     Gershon Elber,    "
      __DATE__ ",   " __TIME__ "\n"
      "(C) Copyright 1989 Gershon Elber, Non commercial use only.\n";
#endif /* SYSV */

#if defined(__SGI_GL__) || defined(__X11__)
    GifByteType *GlblGifBuffer = NULL, *GlblGifBufferPtr = NULL;
#endif /* __SGI_GL__ || __X11__ */

#ifdef __SGI_GL__
static int QuantizeRGBBuffer(int Width, int Height, long *RGBBuffer,
                       GifColorType *ColorMap, GifByteType *GIFBuffer);
#endif /* __SGI_GL__ */

static void GetScanLine(GifPixelType *ScanLine, int Y);
static int HandleGifError(GifFileType *GifFile);

/******************************************************************************
* Dump the given Device, into given File as GIF format:                       *
* Return 0 on success, -1 if device not supported, or GIF-LIB error number.   *
* Device is selected via the ReqGraphDriver. Device mode is selected via      *
* ReqGraphMode1/2 as follows:                                     *
* 1. IBM PC Hercules card: HERCMONO (one mode only) in ReqGraphMode1,         *
*    ReqGraphMode2/3 are ignored.                                 *
* 2. IBM PC EGA card: EGALO/EGAHI in ReqGraphMode1,                     *
*    ReqGraphMode2/3 are ignored.                                 *
* 3. IBM PC EGA64 card: EGA64LO/EGA64HI in ReqGraphMode1,               *
*    ReqGraphMode2/3 are ignored.                                 *
* 4. IBM PC EGAMONO card: EGAMONOHI (one mode only) in ReqGraphMode1,         *
*    ReqGraphMode2/3 are ignored.                                 *
* 5. IBM PC VGA card: VGALO/VGAMED/VGAHI in ReqGraphMode1,              *
*    ReqGraphMode2/3 are ignored.                                 *
* 6. IBM PC SVGA card: ReqGraphMode1/2 are both ignored. Fixed mode (800x600  *
*    16 colors) is assumed.                                       *
* 7. SGI 4D using GL: window id to dump (as returned by winget()) in          *
*    ReqGraphMode1, ReqGraphMode2/3 are ignored.                        *
* 8. X11: Window id in ReqGraphMode1, Display id in ReqGraphMode2, Color      *
*    map id in  ReqGraphMode3.                                          *
******************************************************************************/
int DumpScreen2Gif(char *FileName, int ReqGraphDriver, int ReqGraphMode1,
                                                 int ReqGraphMode2,
                                                 int ReqGraphMode3)
{
    int i, j, k;
    GifPixelType *ScanLine;
    GifFileType *GifFile;
    ColorMapObject *ColorMap = NULL;
#ifdef __MSDOS__
    static GifColorType MonoChromeColorMap[] = {
      { 0, 0, 0 },
      { 255, 255, 255 }
    };
    /* I have no idea what default EGA64 (4 colors) should be (I guessed...).*/
    static GifColorType EGA64ColorMap[] = {
      {   0,   0,   0 },   /* 0. Black */
      { 255,   0,   0 },   /* 1. Red */
      {   0, 255,   0 },   /* 2. Green */
      {   0,   0, 255 },   /* 3. Blue */
    };
    static GifColorType EGAColorMap[] = {
      {   0,   0,   0 },   /* 0. Black */
      {   0,   0, 170 },   /* 1. Blue */
      {   0, 170,   0 },   /* 2. Green */
      {   0, 170, 170 },   /* 3. Cyan */
      { 170,   0,   0 },   /* 4. Red */
      { 170,   0, 170 },   /* 5. Magenta */
      { 170, 170,   0 },   /* 6. Brown */
      { 170, 170, 170 },   /* 7. LightGray */
      {  85,  85,  85 },   /* 8. DarkGray */
      {  85,  85, 255 },   /* 9. LightBlue */
      {  85, 255,  85 },   /* 10. LightGreen */
      {  85, 255, 255 },   /* 11. LightCyan */
      { 255,  85,  85 },   /* 12. LightRed */
      { 255,  85, 255 },   /* 13. LightMagenta */
      { 255, 255,  85 },   /* 14. Yellow */
      { 255, 255, 255 },   /* 15. White */
    };
#endif /* __MSDOS__ */
#if defined(__SGI_GL__) || defined(__X11__)
    long *RGBBuffer;
    GifColorType ColorMap256[256];
#endif
#ifdef __X11__
    XImage *XImg;
    unsigned long XPixel;
    XColor XColorTable[256];                 /* Up to 256 colors in X. */
    XWindowAttributes WinAttr;
#endif /* __X11__ */

    switch (ReqGraphDriver) {        /* Return on non supported screens. */
#ifdef __MSDOS__
        case HERCMONO:
          ScreenXMax = 720;
          ScreenYMax = 350;
          ScreenColorBits = 1;
          ScreenBase = 0xb000;
          ColorMap = MakeMapObject(2, MonoChromeColorMap);
          break;
      case EGA:
          switch (ReqGraphMode1) {
              case EGALO:
                ScreenYMax = 200;
                break;
              case EGAHI:
                ScreenYMax = 350;
                break;
            default:
                  return -1;
          }
          ScreenXMax = 640;
          ScreenColorBits = 4;
          ScreenBase = 0xa000;
          ColorMap = MakeMapObject(16, EGAColorMap);
          break;
      case EGA64:
          switch (ReqGraphMode1) {
              case EGA64LO:
                ScreenYMax = 200;
                break;
              case EGA64HI:
                ScreenYMax = 350;
                break;
            default:
                  return -1;
          }
          ScreenXMax = 640;
          ScreenColorBits = 2;
          ScreenBase = 0xa000;
          ColorMap = MakeMapObject(4, EGA64ColorMap);
          break;
      case EGAMONO:
          switch (ReqGraphMode1) {
              case EGAMONOHI:
                ScreenYMax = 350;
                break;
            default:
                  return -1;
          }
          ScreenXMax = 640;
          ScreenColorBits = 1;
          ScreenBase = 0xa000;
          ColorMap = MakeMapObject(2, MonoChromeColorMap);
          break;
      case VGA:
          switch (ReqGraphMode1) {
              case VGALO:
                ScreenYMax = 200;
                break;
              case VGAMED:
                ScreenYMax = 350;
                break;
              case VGAHI:
                ScreenYMax = 480;
                break;
            default:
                  return -1;
          }
          ScreenXMax = 640;
          ScreenColorBits = 4;
          ScreenBase = 0xa000;
          ColorMap = MakeMapObject(16, EGAColorMap);
          break;
        case SVGA_SPECIAL:
          ScreenXMax = 800;
          ScreenYMax = 600;
          ScreenColorBits = 4;
          ScreenBase = 0xa000;
          ColorMap = MakeMapObject(16, EGAColorMap);
          break;
#endif /* __MSDOS__ */
#ifdef __SGI_GL__
      case GIF_DUMP_SGI_WINDOW:
          winset(ReqGraphMode1);        /* Select window as active window. */
          getsize(&ScreenXMax, &ScreenYMax);

          RGBBuffer = (long *) malloc(sizeof(long) * ScreenXMax * ScreenYMax);
          readsource(SRC_FRONT);
          if (lrectread((short) 0,
                    (short) 0,
                    (short) (ScreenXMax - 1),
                    (short) (ScreenYMax - 1), RGBBuffer) !=
            ScreenXMax * ScreenYMax) {                  /* Get data. */
            free(RGBBuffer);
            return -1;
          }
          GlblGifBuffer = (GifByteType *) malloc(sizeof(GifByteType) *
                                    ScreenXMax * ScreenYMax);
          i = QuantizeRGBBuffer(ScreenXMax, ScreenYMax, RGBBuffer,
                          ColorMap256, GlblGifBuffer);
          /* Find minimum color map size to hold all quantized colors. */
          for     (ScreenColorBits = 1;
             (1 << ScreenColorBits) < i && ScreenColorBits < 8;
             ScreenColorBits++);

          /* Start to dump with top line as GIF expects it. */
          GlblGifBufferPtr = GlblGifBuffer + ScreenXMax * (ScreenYMax - 1);
          ColorMap = MakeMapObject(256, ColorMap256);
          free(RGBBuffer);
          break;
#endif /* __SGI_GL__ */
#ifdef __X11__
      case GIF_DUMP_X_WINDOW:
          XGetWindowAttributes((Display *) ReqGraphMode2,
                         (Window) ReqGraphMode1,
                         &WinAttr);
          ScreenXMax = WinAttr.width;
          ScreenYMax = WinAttr.height;

          XImg = XGetImage((Display *) ReqGraphMode2,
                       (Window) ReqGraphMode1,
                       0, 0, ScreenXMax - 1, ScreenYMax - 1,
                       AllPlanes, XYPixmap);

          GlblGifBuffer = (GifByteType *) malloc(sizeof(GifByteType) *
                                    ScreenXMax * ScreenYMax);

          /* Scan the image for all different colors exists. */
          for (i = 0; i < 256; i++) XColorTable[i].pixel = 0;
          k = FALSE;
          for (i = 0; i < ScreenXMax; i++)
            for (j = 0; j < ScreenYMax; j++) {
                XPixel = XGetPixel(XImg, i, j);
                if (XPixel > 255) {
                  if (!k) {
                      /* Make sure we state it once only.*/
                      fprintf(stderr, "X Color table - truncated.\n");
                      k = TRUE;
                  }
                  XPixel = 255;
                }
                XColorTable[XPixel].pixel = XPixel;
            }
          /* Find the RGB representation of the colors. */
          XQueryColors((Display *) ReqGraphMode2,
                   (Colormap) ReqGraphMode3,
                   XColorTable,
                   256);
          /* Count number of active colors (Note color 0 is always in)    */
          /* and create the Gif color map from it.                    */
          ColorMap = MakeMapObject(256, ColorMap256);
          ColorMap->Colors[0].Red = ColorMap->Colors[0].Green = ColorMap->Colors[0].Blue = 0;
          for (i = j = 1; i < 256; i++)
            if (XColorTable[i].pixel) {
                ColorMap->Colors[j].Red = XColorTable[i].red / 256;
                ColorMap->Colors[j].Green = XColorTable[i].green / 256;
                ColorMap->Colors[j].Blue = XColorTable[i].blue / 256;
                /* Save the X color index into the Gif table: */
                XColorTable[i].pixel = j++;
            }
          /* and set the number of colors in the Gif color map. */
          for     (ScreenColorBits = 1;
             (1 << ScreenColorBits) < j && ScreenColorBits < 8;
             ScreenColorBits++);

          /* Prepare the Gif image buffer as indices into the Gif color   */
          /* map from the X image.                              */
          GlblGifBufferPtr = GlblGifBuffer;
          for (i = 0; i < ScreenXMax; i++)
            for (j = 0; j < ScreenYMax; j++)
                *GlblGifBufferPtr++ =
                  XColorTable[XGetPixel(XImg, j, i) & 0xff].pixel;
          XDestroyImage(XImg);

          GlblGifBufferPtr = GlblGifBuffer;
          ColorMap = MakeMapObject(256, ColorMap256);
          break;
#endif /* __X11__ */
      default:
          return -1;
    }

    ScanLine = (GifPixelType *) malloc(sizeof(GifPixelType) * ScreenXMax);

    GraphDriver = ReqGraphDriver;
    GraphMode = ReqGraphMode1;

    if ((GifFile = EGifOpenFileName(FileName, FALSE)) == NULL ||
      EGifPutScreenDesc(GifFile, ScreenXMax, ScreenYMax, ScreenColorBits,
                    0, ColorMap) == GIF_ERROR ||
      EGifPutImageDesc(GifFile, 0, 0, ScreenXMax, ScreenYMax, FALSE,
                   NULL) == GIF_ERROR) {
      free((char *) ScanLine);
#if defined(__SGI_GL__) || defined(__X11__)
      free((char *) GlblGifBuffer);
#endif
      return HandleGifError(GifFile);
    }

    for (i = 0; i < ScreenYMax; i++) {
      GetScanLine(ScanLine, i);
      if (EGifPutLine(GifFile, ScanLine, ScreenXMax) == GIF_ERROR) {
          free((char *) ScanLine);
#if defined(__SGI_GL__) || defined(__X11__)
          free((char *) GlblGifBuffer);
#endif
          return HandleGifError(GifFile);
      }
    }

    if (EGifCloseFile(GifFile) == GIF_ERROR) {
      free((char *) ScanLine);
#if defined(__SGI_GL__) || defined(__X11__)
      free((char *) GlblGifBuffer);
#endif
      return HandleGifError(GifFile);
    }

    free((char *) ScanLine);
#if defined(__SGI_GL__) || defined(__X11__)
    free((char *) GlblGifBuffer);
#endif
    return 0;
}

#ifdef __SGI_GL__
/******************************************************************************
* Quantize the given 24 bit (8 per RGB) into 256 colors.                *
******************************************************************************/
static int QuantizeRGBBuffer(int Width, int Height, long *RGBBuffer,
                        GifColorType *ColorMap, GifByteType *GIFBuffer)
{
    int i;
    GifByteType *RedInput, *GreenInput, *BlueInput;

    /* Convert the RGB Buffer into 3 seperated buffers: */
    RedInput = (GifByteType *) malloc(sizeof(GifByteType) * Width * Height);
    GreenInput = (GifByteType *) malloc(sizeof(GifByteType) * Width * Height);
    BlueInput = (GifByteType *) malloc(sizeof(GifByteType) * Width * Height);

    for (i = 0; i < Width * Height; i++) {
      RedInput[i] = RGBBuffer[i] & 0xff;
      GreenInput[i] = (RGBBuffer[i] >> 8) & 0xff;
      BlueInput[i] = (RGBBuffer[i] >> 16) & 0xff;
    }
    for (i = 0; i < 256; i++)
      ColorMap[i].Red = ColorMap[i].Green = ColorMap[i].Blue = 0;

    i = 256;
    QuantizeBuffer(Width, Height, &i,
               RedInput, GreenInput, BlueInput,
               GIFBuffer, ColorMap);

    free(RedInput);
    free(GreenInput);
    free(BlueInput);

    return i;                    /* Real number of colors in color table. */
}
#endif /* __SGI_GL__ */

/******************************************************************************
* Update the given scan line buffer with the pixel levels of the Y line.      *
* This routine is device specific, so make sure you know was you are doing    *
******************************************************************************/
static void GetScanLine(GifPixelType *ScanLine, int Y)
{
    unsigned char ScreenByte;
    int i, j, k;
    unsigned int BufferOffset, Bit;
#ifdef __MSDOS__
    union REGS InRegs, OutRegs;
#endif /* __MSDOS__ */

    switch (GraphDriver) {
#ifdef __MSDOS__
      case HERCMONO:
          BufferOffset = 0x2000 * (Y % 4) + (Y / 4) * (ScreenXMax / 8);
          /* In one scan lines we have ScreenXMax / 8 bytes: */
          for (i = 0, k = 0; i < ScreenXMax / 8; i++) {
            ScreenByte = (unsigned char) peekb(ScreenBase, BufferOffset++);
            for (j = 0, Bit = 0x80; j < 8; j++) {
                ScanLine[k++] = (ScreenByte & Bit ? 1 : 0);
                Bit >>= 1;
            }
          }
          break;
      case EGA:
      case EGA64:
      case EGAMONO:
      case VGA:
      case SVGA_SPECIAL:
          InRegs.x.dx = Y;
          InRegs.h.bh = 0;
          InRegs.h.ah = 0x0d;                      /* BIOS Read dot. */
          for (i = 0; i < ScreenXMax; i++) {
            InRegs.x.cx = i;
            int86(0x10, &InRegs, &OutRegs);
            ScanLine[i] = OutRegs.h.al;
          }

          /* Makr this line as done by putting a xored dot on the left. */
          InRegs.x.dx = Y;
          InRegs.h.bh = 0;
          InRegs.h.ah = 0x0c;              /* BIOS Write dot (xor mode). */
          InRegs.h.al = 0x81;                     /* Xor with color 1. */
          InRegs.x.cx = 0;
          int86(0x10, &InRegs, &OutRegs);
          InRegs.x.dx = Y;
          InRegs.h.bh = 0;
          InRegs.h.ah = 0x0c;              /* BIOS Write dot (xor mode). */
          InRegs.h.al = 0x81;                     /* Xor with color 1. */
          InRegs.x.cx = 1;
          int86(0x10, &InRegs, &OutRegs);

          if (Y == ScreenYMax - 1) {/* Last row - clear all marks we made. */
            for (i = 0; i < ScreenYMax; i++) {
                InRegs.h.bh = 0;
                InRegs.h.ah = 0x0c;        /* BIOS Write dot (xor mode). */
                InRegs.h.al = 0x81;          /* Xor back with color 1. */
                InRegs.x.dx = i;
                InRegs.x.cx = 0;
                int86(0x10, &InRegs, &OutRegs);
                InRegs.h.bh = 0;
                InRegs.h.ah = 0x0c;        /* BIOS Write dot (xor mode). */
                InRegs.h.al = 0x81;          /* Xor back with color 1. */
                InRegs.x.dx = i;
                InRegs.x.cx = 1;
                int86(0x10, &InRegs, &OutRegs);
                }
          }
          break;
#endif /* __MSDOS__ */
#ifdef __SGI_GL__
      case GIF_DUMP_SGI_WINDOW:
          memcpy(ScanLine, GlblGifBufferPtr, ScreenXMax * sizeof(GifPixelType));
          GlblGifBufferPtr -= ScreenXMax;
          break;
#endif /* __SGI_GL__ */
#ifdef __X11__
      case GIF_DUMP_X_WINDOW:
          memcpy(ScanLine, GlblGifBufferPtr, ScreenXMax * sizeof(GifPixelType));
          GlblGifBufferPtr += ScreenXMax;
          break;
#endif /* __X11__ */
      default:
          break;
    }
}

/******************************************************************************
* Handle last GIF error. Try to close the file and free all allocated memory. *
******************************************************************************/
static int HandleGifError(GifFileType *GifFile)
{
    int i = GifLastError();

    if (EGifCloseFile(GifFile) == GIF_ERROR) {
      GifLastError();
    }
    return i;
}










Generated by  Doxygen 1.6.0   Back to index