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DEV2GIF.C
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1990-10-17
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/*****************************************************************************
* "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;
GifColorType *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 = 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 = 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 = EGA64ColorMap;
break;
case EGAMONO:
switch (ReqGraphMode1) {
case EGAMONOHI:
ScreenYMax = 350;
break;
default:
return -1;
}
ScreenXMax = 640;
ScreenColorBits = 1;
ScreenBase = 0xa000;
ColorMap = 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 = EGAColorMap;
break;
case SVGA_SPECIAL:
ScreenXMax = 800;
ScreenYMax = 600;
ScreenColorBits = 4;
ScreenBase = 0xa000;
ColorMap = 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 = 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 = ColorMap256;
ColorMap[0].Red = ColorMap[0].Green = ColorMap[0].Blue = 0;
for (i = j = 1; i < 256; i++)
if (XColorTable[i].pixel) {
ColorMap[j].Red = XColorTable[i].red / 256;
ColorMap[j].Green = XColorTable[i].green / 256;
ColorMap[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 = 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, ScreenColorBits, ColorMap) == GIF_ERROR ||
EGifPutImageDesc(GifFile, 0, 0, ScreenXMax, ScreenYMax, FALSE, 1,
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;
}