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511 lines
18 KiB
C
511 lines
18 KiB
C
/*****************************************************************************
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* "Gif-Lib" - Yet another gif library.
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*
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* Written by: Gershon Elber IBM PC Ver 1.1, Jun. 1989
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*****************************************************************************
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* Module to dump graphic devices into a GIF file. Current supported devices:
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* 1. EGA, VGA, SVGA (800x600), Hercules on the IBM PC (#define __MSDOS__).
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* 2. SGI 4D Irix using gl library (#define SGI_GL__).
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* 3. X11 using libX.a (#define __X11__).
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* 4. (2 & 3 have been changed to HAVE_GL_S and HAVE_LIBX11 and should be set
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* by the configure script.)
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*****************************************************************************
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* History:
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* 22 Jun 89 - Version 1.0 by Gershon Elber.
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* 12 Aug 90 - Version 1.1 by Gershon Elber (added devices).
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****************************************************************************/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef __MSDOS__
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#include <dos.h>
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#include <alloc.h>
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#include <graphics.h>
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#endif /* __MSDOS__ */
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#ifdef HAVE_LIBX11
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#endif /* HAVE_LIBX11 */
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#ifdef HAVE_LIBGL_S
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#include <gl/gl.h>
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#endif /* HAVE_LIBGL_S */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "gif_lib.h"
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#define SVGA_SPECIAL 999 /* 800 by 600 Super VGA mode. */
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static int GraphDriver = -1, /* Device parameters - reasonable values. */
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GraphMode = -1, ScreenColorBits = 1;
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static long ScreenXMax = 100, ScreenYMax = 100;
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#ifdef __MSDOS__
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static unsigned int ScreenBase;
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#endif /* __MSDOS__ */
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#if defined(HAVE_LIBGL_S) || defined(HAVE_LIBX11)
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GifByteType *GlblGifBuffer = NULL, *GlblGifBufferPtr = NULL;
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#endif /* HAVE_LIBGL_S || HAVE_LIBX11 */
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#ifdef HAVE_LIBGL_S
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static int QuantizeRGBBuffer(int Width, int Height, long *RGBBuffer,
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GifColorType * ColorMap,
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GifByteType * GIFBuffer);
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#endif /* HAVE_LIBGL_S */
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static void GetScanLine(GifPixelType * ScanLine, int Y);
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static int HandleGifError(GifFileType * GifFile);
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/******************************************************************************
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* Dump the given Device, into given File as GIF format:
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* Return 0 on success, -1 if device not supported, or GIF-LIB error number.
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* Device is selected via the ReqGraphDriver. Device mode is selected via
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* ReqGraphMode1/2 as follows:
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* 1. IBM PC Hercules card: HERCMONO (one mode only) in ReqGraphMode1,
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* ReqGraphMode2/3 are ignored.
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* 2. IBM PC EGA card: EGALO/EGAHI in ReqGraphMode1,
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* ReqGraphMode2/3 are ignored.
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* 3. IBM PC EGA64 card: EGA64LO/EGA64HI in ReqGraphMode1,
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* ReqGraphMode2/3 are ignored.
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* 4. IBM PC EGAMONO card: EGAMONOHI (one mode only) in ReqGraphMode1,
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* ReqGraphMode2/3 are ignored.
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* 5. IBM PC VGA card: VGALO/VGAMED/VGAHI in ReqGraphMode1,
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* ReqGraphMode2/3 are ignored.
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* 6. IBM PC SVGA card: ReqGraphMode1/2 are both ignored. Fixed mode (800x600
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* 16 colors) is assumed.
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* 7. SGI 4D using GL: window id to dump (as returned by winget()) in
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* ReqGraphMode1, ReqGraphMode2/3 are ignored.
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* 8. X11: Window id in ReqGraphMode1, Display id in ReqGraphMode2, Color
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* map id in ReqGraphMode3.
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*****************************************************************************/
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int
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DumpScreen2Gif(const char *FileName,
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int ReqGraphDriver,
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long ReqGraphMode1,
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long ReqGraphMode2,
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long ReqGraphMode3) {
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int i, j, k;
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GifPixelType *ScanLine;
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GifFileType *GifFile;
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ColorMapObject *ColorMap = NULL;
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#ifdef __MSDOS__
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static GifColorType MonoChromeColorMap[] = {
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{0, 0, 0},
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{255, 255, 255}
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};
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/* I have no idea what default EGA64 (4 colors) should be (I guessed...). */
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static GifColorType EGA64ColorMap[] = {
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{0, 0, 0}, /* 0. Black */
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{255, 0, 0}, /* 1. Red */
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{0, 255, 0}, /* 2. Green */
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{0, 0, 255}, /* 3. Blue */
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};
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static GifColorType EGAColorMap[] = {
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{0, 0, 0}, /* 0. Black */
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{0, 0, 170}, /* 1. Blue */
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{0, 170, 0}, /* 2. Green */
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{0, 170, 170}, /* 3. Cyan */
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{170, 0, 0}, /* 4. Red */
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{170, 0, 170}, /* 5. Magenta */
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{170, 170, 0}, /* 6. Brown */
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{170, 170, 170}, /* 7. LightGray */
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{85, 85, 85}, /* 8. DarkGray */
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{85, 85, 255}, /* 9. LightBlue */
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{85, 255, 85}, /* 10. LightGreen */
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{85, 255, 255}, /* 11. LightCyan */
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{255, 85, 85}, /* 12. LightRed */
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{255, 85, 255}, /* 13. LightMagenta */
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{255, 255, 85}, /* 14. Yellow */
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{255, 255, 255}, /* 15. White */
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};
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#endif /* __MSDOS__ */
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#if defined(HAVE_LIBGL_S)
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long *RGBBuffer;
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#ifndef HAVE_LIBX11
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GifColorType ColorMap256[256];
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#endif /* Undefined HAVE_LIBX11 */
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#endif /* HAVE_LIBGL_S */
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#ifdef HAVE_LIBX11
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XImage *XImg;
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unsigned long XPixel;
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GifColorType ColorMap256[256];
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XColor XColorTable[256]; /* Up to 256 colors in X. */
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XWindowAttributes WinAttr;
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#endif /* HAVE_LIBX11 */
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switch (ReqGraphDriver) { /* Return on non supported screens. */
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#ifdef __MSDOS__
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case HERCMONO:
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ScreenXMax = 720;
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ScreenYMax = 350;
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ScreenColorBits = 1;
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ScreenBase = 0xb000;
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ColorMap = MakeMapObject(2, MonoChromeColorMap);
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break;
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case EGA:
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switch (ReqGraphMode1) {
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case EGALO:
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ScreenYMax = 200;
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break;
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case EGAHI:
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ScreenYMax = 350;
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break;
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default:
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return -1;
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}
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ScreenXMax = 640;
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ScreenColorBits = 4;
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ScreenBase = 0xa000;
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ColorMap = MakeMapObject(16, EGAColorMap);
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break;
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case EGA64:
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switch (ReqGraphMode1) {
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case EGA64LO:
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ScreenYMax = 200;
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break;
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case EGA64HI:
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ScreenYMax = 350;
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break;
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default:
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return -1;
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}
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ScreenXMax = 640;
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ScreenColorBits = 2;
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ScreenBase = 0xa000;
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ColorMap = MakeMapObject(4, EGA64ColorMap);
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break;
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case EGAMONO:
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switch (ReqGraphMode1) {
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case EGAMONOHI:
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ScreenYMax = 350;
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break;
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default:
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return -1;
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}
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ScreenXMax = 640;
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ScreenColorBits = 1;
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ScreenBase = 0xa000;
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ColorMap = MakeMapObject(2, MonoChromeColorMap);
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break;
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case VGA:
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switch (ReqGraphMode1) {
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case VGALO:
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ScreenYMax = 200;
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break;
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case VGAMED:
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ScreenYMax = 350;
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break;
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case VGAHI:
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ScreenYMax = 480;
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break;
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default:
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return -1;
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}
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ScreenXMax = 640;
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ScreenColorBits = 4;
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ScreenBase = 0xa000;
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ColorMap = MakeMapObject(16, EGAColorMap);
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break;
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case SVGA_SPECIAL:
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ScreenXMax = 800;
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ScreenYMax = 600;
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ScreenColorBits = 4;
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ScreenBase = 0xa000;
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ColorMap = MakeMapObject(16, EGAColorMap);
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break;
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#endif /* __MSDOS__ */
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#ifdef HAVE_LIBGL_S
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case GIF_DUMP_SGI_WINDOW:
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winset(ReqGraphMode1); /* Select window as active window. */
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getsize(&ScreenXMax, &ScreenYMax);
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RGBBuffer = (long *)malloc(sizeof(long) * ScreenXMax * ScreenYMax);
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readsource(SRC_FRONT);
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if (lrectread((short)0, (short)0, (short)(ScreenXMax - 1),
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(short)(ScreenYMax - 1), RGBBuffer) !=
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ScreenXMax * ScreenYMax) { /* Get data. */
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free(RGBBuffer);
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return -1;
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}
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GlblGifBuffer = (GifByteType *) malloc(sizeof(GifByteType) *
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ScreenXMax * ScreenYMax);
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i = QuantizeRGBBuffer(ScreenXMax, ScreenYMax, RGBBuffer,
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ColorMap256, GlblGifBuffer);
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/* Find minimum color map size to hold all quantized colors. */
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for (ScreenColorBits = 1;
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(1 << ScreenColorBits) < i && ScreenColorBits < 8;
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ScreenColorBits++) ;
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/* Start to dump with top line as GIF expects it. */
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GlblGifBufferPtr = GlblGifBuffer + ScreenXMax * (ScreenYMax - 1);
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ColorMap = MakeMapObject(256, ColorMap256);
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free(RGBBuffer);
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break;
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#endif /* HAVE_LIBGL_S */
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#ifdef HAVE_LIBX11
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case GIF_DUMP_X_WINDOW:
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XGetWindowAttributes((Display *) ReqGraphMode2,
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(Window) ReqGraphMode1, &WinAttr);
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ScreenXMax = WinAttr.width;
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ScreenYMax = WinAttr.height;
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XImg = XGetImage((Display *) ReqGraphMode2,
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(Window) ReqGraphMode1,
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0, 0, ScreenXMax - 1, ScreenYMax - 1,
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AllPlanes, XYPixmap);
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GlblGifBuffer = (GifByteType *)malloc(sizeof(GifByteType) *
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ScreenXMax * ScreenYMax);
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/* Scan the image for all different colors exists. */
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for (i = 0; i < 256; i++)
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XColorTable[i].pixel = 0;
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k = FALSE;
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for (i = 0; i < ScreenXMax; i++)
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for (j = 0; j < ScreenYMax; j++) {
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XPixel = XGetPixel(XImg, i, j);
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if (XPixel > 255) {
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if (!k) {
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/* Make sure we state it once only. */
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fprintf(stderr, "X Color table - truncated.\n");
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k = TRUE;
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}
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XPixel = 255;
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}
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XColorTable[XPixel].pixel = XPixel;
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}
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/* Find the RGB representation of the colors. */
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XQueryColors((Display *) ReqGraphMode2,
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(Colormap) ReqGraphMode3, XColorTable, 256);
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/* Count number of active colors (Note color 0 is always in) */
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/* and create the Gif color map from it. */
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ColorMap = MakeMapObject(256, ColorMap256);
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ColorMap->Colors[0].Red = ColorMap->Colors[0].Green =
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ColorMap->Colors[0].Blue = 0;
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for (i = j = 1; i < 256; i++)
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if (XColorTable[i].pixel) {
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ColorMap->Colors[j].Red = XColorTable[i].red / 256;
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ColorMap->Colors[j].Green = XColorTable[i].green / 256;
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ColorMap->Colors[j].Blue = XColorTable[i].blue / 256;
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/* Save the X color index into the Gif table: */
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XColorTable[i].pixel = j++;
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}
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/* and set the number of colors in the Gif color map. */
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for (ScreenColorBits = 1;
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(1 << ScreenColorBits) < j && ScreenColorBits < 8;
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ScreenColorBits++) ;
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/* Prepare the Gif image buffer as indices into the Gif color */
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/* map from the X image. */
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GlblGifBufferPtr = GlblGifBuffer;
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for (i = 0; i < ScreenXMax; i++)
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for (j = 0; j < ScreenYMax; j++)
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*GlblGifBufferPtr++ =
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XColorTable[XGetPixel(XImg, j, i) & 0xff].pixel;
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XDestroyImage(XImg);
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GlblGifBufferPtr = GlblGifBuffer;
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ColorMap = MakeMapObject(256, ColorMap256);
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break;
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#endif /* HAVE_LIBX11 */
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default:
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return -1;
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}
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ScanLine = (GifPixelType *)malloc(sizeof(GifPixelType) * ScreenXMax);
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GraphDriver = ReqGraphDriver;
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GraphMode = ReqGraphMode1;
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if ((GifFile = EGifOpenFileName(FileName, FALSE)) == NULL ||
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EGifPutScreenDesc(GifFile, ScreenXMax, ScreenYMax, ScreenColorBits,
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0, ColorMap) == GIF_ERROR ||
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EGifPutImageDesc(GifFile, 0, 0, ScreenXMax, ScreenYMax, FALSE,
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NULL) == GIF_ERROR) {
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free((char *)ScanLine);
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#if defined(HAVE_LIBGL_S) || defined(HAVE_LIBX11)
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free((char *)GlblGifBuffer);
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#endif
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return HandleGifError(GifFile);
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}
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for (i = 0; i < ScreenYMax; i++) {
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GetScanLine(ScanLine, i);
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if (EGifPutLine(GifFile, ScanLine, ScreenXMax) == GIF_ERROR) {
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free((char *)ScanLine);
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#if defined(HAVE_LIBGL_S) || defined(HAVE_LIBX11)
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free((char *)GlblGifBuffer);
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#endif
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return HandleGifError(GifFile);
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}
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}
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if (EGifCloseFile(GifFile) == GIF_ERROR) {
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free((char *)ScanLine);
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#if defined(HAVE_LIBGL_S) || defined(HAVE_LIBX11)
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free((char *)GlblGifBuffer);
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#endif
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return HandleGifError(GifFile);
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}
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free((char *)ScanLine);
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#if defined(HAVE_LIBGL_S) || defined(HAVE_LIBX11)
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free((char *)GlblGifBuffer);
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#endif
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return 0;
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}
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#ifdef HAVE_LIBGL_S
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/******************************************************************************
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* Quantize the given 24 bit (8 per RGB) into 256 colors.
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*****************************************************************************/
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static int
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QuantizeRGBBuffer(int Width,
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int Height,
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long *RGBBuffer,
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GifColorType * ColorMap,
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GifByteType * GIFBuffer) {
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int i;
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GifByteType *RedInput, *GreenInput, *BlueInput;
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/* Convert the RGB Buffer into 3 seperated buffers: */
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RedInput = (GifByteType *) malloc(sizeof(GifByteType) * Width * Height);
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GreenInput = (GifByteType *) malloc(sizeof(GifByteType) * Width * Height);
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BlueInput = (GifByteType *) malloc(sizeof(GifByteType) * Width * Height);
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for (i = 0; i < Width * Height; i++) {
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RedInput[i] = RGBBuffer[i] & 0xff;
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GreenInput[i] = (RGBBuffer[i] >> 8) & 0xff;
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BlueInput[i] = (RGBBuffer[i] >> 16) & 0xff;
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}
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for (i = 0; i < 256; i++)
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ColorMap[i].Red = ColorMap[i].Green = ColorMap[i].Blue = 0;
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i = 256;
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QuantizeBuffer(Width, Height, &i,
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RedInput, GreenInput, BlueInput, GIFBuffer, ColorMap);
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free(RedInput);
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free(GreenInput);
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free(BlueInput);
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return i; /* Real number of colors in color table. */
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}
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#endif /* HAVE_LIBGL_S */
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/******************************************************************************
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* Update the given scan line buffer with the pixel levels of the Y line.
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* This routine is device specific, so make sure you know was you are doing
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*****************************************************************************/
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static void
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GetScanLine(GifPixelType * ScanLine,
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int Y) {
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#ifdef __MSDOS__
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unsigned char ScreenByte;
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int i, j, k;
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unsigned int BufferOffset, Bit;
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union REGS InRegs, OutRegs;
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#endif /* __MSDOS__ */
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switch (GraphDriver) {
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#ifdef __MSDOS__
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case HERCMONO:
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BufferOffset = 0x2000 * (Y % 4) + (Y / 4) * (ScreenXMax / 8);
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/* In one scan lines we have ScreenXMax / 8 bytes: */
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for (i = 0, k = 0; i < ScreenXMax / 8; i++) {
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ScreenByte = (unsigned char)peekb(ScreenBase, BufferOffset++);
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for (j = 0, Bit = 0x80; j < 8; j++) {
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ScanLine[k++] = (ScreenByte & Bit ? 1 : 0);
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Bit >>= 1;
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}
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}
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break;
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case EGA:
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case EGA64:
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case EGAMONO:
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case VGA:
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case SVGA_SPECIAL:
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InRegs.x.dx = Y;
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InRegs.h.bh = 0;
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InRegs.h.ah = 0x0d; /* BIOS Read dot. */
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for (i = 0; i < ScreenXMax; i++) {
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InRegs.x.cx = i;
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int86(0x10, &InRegs, &OutRegs);
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ScanLine[i] = OutRegs.h.al;
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}
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/* Makr this line as done by putting a xored dot on the left. */
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InRegs.x.dx = Y;
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InRegs.h.bh = 0;
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InRegs.h.ah = 0x0c; /* BIOS Write dot (xor mode). */
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InRegs.h.al = 0x81; /* Xor with color 1. */
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InRegs.x.cx = 0;
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int86(0x10, &InRegs, &OutRegs);
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InRegs.x.dx = Y;
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InRegs.h.bh = 0;
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InRegs.h.ah = 0x0c; /* BIOS Write dot (xor mode). */
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InRegs.h.al = 0x81; /* Xor with color 1. */
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InRegs.x.cx = 1;
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int86(0x10, &InRegs, &OutRegs);
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if (Y == ScreenYMax - 1) { /* Last row - clear all marks we
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* made. */
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for (i = 0; i < ScreenYMax; i++) {
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InRegs.h.bh = 0;
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InRegs.h.ah = 0x0c; /* BIOS Write dot (xor mode). */
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InRegs.h.al = 0x81; /* Xor back with color 1. */
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InRegs.x.dx = i;
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InRegs.x.cx = 0;
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int86(0x10, &InRegs, &OutRegs);
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InRegs.h.bh = 0;
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InRegs.h.ah = 0x0c; /* BIOS Write dot (xor mode). */
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InRegs.h.al = 0x81; /* Xor back with color 1. */
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InRegs.x.dx = i;
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InRegs.x.cx = 1;
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int86(0x10, &InRegs, &OutRegs);
|
|
}
|
|
}
|
|
break;
|
|
#endif /* __MSDOS__ */
|
|
#ifdef HAVE_LIBGL_S
|
|
case GIF_DUMP_SGI_WINDOW:
|
|
memcpy(ScanLine, GlblGifBufferPtr,
|
|
ScreenXMax * sizeof(GifPixelType));
|
|
GlblGifBufferPtr -= ScreenXMax;
|
|
break;
|
|
#endif /* HAVE_LIBGL_S */
|
|
#ifdef HAVE_LIBX11
|
|
case GIF_DUMP_X_WINDOW:
|
|
memcpy(ScanLine, GlblGifBufferPtr,
|
|
ScreenXMax * sizeof(GifPixelType));
|
|
GlblGifBufferPtr += ScreenXMax;
|
|
break;
|
|
#endif /* HAVE_LIBX11 */
|
|
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;
|
|
}
|