stage2/graphics.c - grub4dos-solaris - Rivoreo Source Code Repositories

 /* graphics.c - graphics mode support for GRUB */
 /* Implemented as a terminal type by Jeremy Katz <katzj@redhat.com> based
  * on a patch by Paulo César Pereira de Andrade <pcpa@conectiva.com.br>
  */
 /*
  *  GRUB  --  GRand Unified Bootloader
  *  Copyright (C) 2001,2002  Red Hat, Inc.
  *  Portions copyright (C) 2000  Conectiva, Inc.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */


 #ifdef SUPPORT_GRAPHICS

 #include <term.h>
 #include <shared.h>
 #include <graphics.h>

 static int saved_videomode = 0;
 extern unsigned char *font8x16;

 int outline = 0;
 int disable_space_highlight = 0;
 extern int graphics_inited;
 char splashimage[64];

 #define VSHADOW VSHADOW1
 /* 8x16 dot array, total chars = 80*30. plano size = 80*30*16 = 38400 bytes */
 static unsigned char *VSHADOW1 = (unsigned char *)0x3A0000;	//unsigned char VSHADOW1[38400];
 static unsigned char *VSHADOW2 = (unsigned char *)0x3A9600;	//unsigned char VSHADOW2[38400];
 static unsigned char *VSHADOW4 = (unsigned char *)0x3B2C00;	//unsigned char VSHADOW4[38400];
 static unsigned char *VSHADOW8 = (unsigned char *)0x3BC200;	//unsigned char VSHADOW8[38400];
 /* text buffer has to be kept around so that we can write things as we
  * scroll and the like */
 //static unsigned short text[80 * 30];
 static unsigned long *text = (unsigned long *)0x3C5800; // length in bytes = 80*30*4

 /* constants to define the viewable area */
 const int x0 = 0;
 const int x1 = 80;
 const int y0 = 0;
 const int y1 = 30;

 /* why do these have to be kept here? */
 int foreground = (63 << 16) | (63 << 8) | (63), background = 0, border = 0;

 /* current position */
 extern int fontx;
 extern int fonty;

 /* global state so that we don't try to recursively scroll or cursor */
 static int no_scroll = 0;

 /* color state */
 static int graphics_standard_color = A_NORMAL;
 static int graphics_normal_color = A_NORMAL;
 static int graphics_highlight_color = A_REVERSE;
 static int graphics_helptext_color = A_NORMAL;
 static int graphics_heading_color = A_NORMAL;
 static int graphics_current_color = A_NORMAL;
 static color_state graphics_color_state = COLOR_STATE_STANDARD;


 /* graphics local functions */
 static void graphics_setxy (int col, int row);
 static void graphics_scroll (void);
 static int read_image (char *s);
 extern void (*graphics_CURSOR) (int set);
 /* FIXME: where do these really belong? */
 static inline void outb(unsigned short port, unsigned char val)
 {
     __asm __volatile ("outb %0,%1"::"a" (val), "d" (port));
 }

 static void MapMask(int value) {
     outb(0x3c4, 2);
     outb(0x3c5, value);
 }

 /* bit mask register */
 static void BitMask(int value) {
     outb(0x3ce, 8);
     outb(0x3cf, value);
 }


 ///* Set the splash image */
 //void graphics_set_splash(char *splashfile) {
 //    grub_strcpy(splashimage, splashfile);
 //}

 ///* Get the current splash image */
 //char *graphics_get_splash(void) {
 //    return splashimage;
 //}

 /* Initialize a vga16 graphics display with the palette based off of
  * the image in splashimage.  If the image doesn't exist, leave graphics
  * mode.  */
 int
 graphics_init (void)
 {
     /* graphics mode will corrupt the extended memory. so we should
      * invalidate the kernel_type. */
     kernel_type = KERNEL_TYPE_NONE;
 	if (! graphics_CURSOR) graphics_CURSOR = (void *)&graphics_cursor;

     if (! graphics_inited)
     {
         saved_videomode = set_videomode (0x12);
     }

     if (! read_image (splashimage))
     {
         set_videomode (saved_videomode);
         grub_printf("failed to read image\n");
         return 0;
     }

     font8x16 = (unsigned char *) graphics_get_font (); /* code in asm.S */

     graphics_inited = 1;

     /* make sure that the highlight color is set correctly */
     graphics_highlight_color = ((graphics_normal_color >> 4) |
 				((graphics_normal_color & 0xf) << 4));

     return 1;
 }

 /* Leave graphics mode */
 void
 graphics_end (void)
 {
     if (graphics_inited)
     {
         set_videomode (saved_videomode);
         graphics_inited = 0;
     }
 }

 /* Print ch on the screen.  Handle any needed scrolling or the like */
 void
 graphics_putchar (int ch)
 {
     ch &= 0xff;

     //graphics_CURSOR(0);

     if (ch == '\n') {
         if (fonty + 1 < y1)
             graphics_gotoxy(fontx, fonty + 1);
         else
 	{
 	    graphics_CURSOR(0);
             graphics_scroll();
 	    graphics_CURSOR(1);
 	}
         //graphics_CURSOR(1);
         return;
     } else if (ch == '\r') {
         graphics_gotoxy(x0, fonty);
         //graphics_CURSOR(1);
         return;
     }

     //graphics_CURSOR(0);

     text[fonty * 80 + fontx] = ch;
     text[fonty * 80 + fontx] &= 0x00ff;
     if (graphics_current_color & 0xf0)
         text[fonty * 80 + fontx] |= 0x10000;//0x100;

     graphics_CURSOR(0);

     if ((fontx + 1) >= x1)
     {
         if (fonty + 1 < y1)
             graphics_setxy(x0, fonty + 1);
         else
 	{
             graphics_setxy(x0, fonty);
             graphics_scroll();
 	}
     } else {
         graphics_setxy(fontx + 1, fonty);
     }

     graphics_CURSOR(1);
 }

 /* get the current location of the cursor */
 int
 graphics_getxy(void)
 {
     return (fontx << 8) | fonty;
 }

 void
 graphics_gotoxy (int x, int y)
 {
     graphics_CURSOR(0);

     graphics_setxy(x, y);

     graphics_CURSOR(1);
 }

 void
 graphics_cls (void)
 {
     int i;
     unsigned char *mem, *s1, *s2, *s4, *s8;

     graphics_CURSOR(0);
     graphics_gotoxy(x0, y0);

     mem = (unsigned char*)VIDEOMEM;
     s1 = (unsigned char*)VSHADOW1;
     s2 = (unsigned char*)VSHADOW2;
     s4 = (unsigned char*)VSHADOW4;
     s8 = (unsigned char*)VSHADOW8;

     for (i = 0; i < 80 * 30; i++)
         text[i] = ' ';
     graphics_CURSOR(1);

     BitMask(0xff);

     /* plano 1 */
     MapMask(1);
     grub_memcpy(mem, s1, 38400);

     /* plano 2 */
     MapMask(2);
     grub_memcpy(mem, s2, 38400);

     /* plano 3 */
     MapMask(4);
     grub_memcpy(mem, s4, 38400);

     /* plano 4 */
     MapMask(8);
     grub_memcpy(mem, s8, 38400);

     MapMask(15);

 }

 void
 graphics_setcolorstate (color_state state)
 {
     switch (state)
     {
 	case COLOR_STATE_STANDARD:
 		graphics_current_color = graphics_standard_color;
 		break;
 	case COLOR_STATE_NORMAL:
 		graphics_current_color = graphics_normal_color;
 		break;
 	case COLOR_STATE_HIGHLIGHT:
 		graphics_current_color = graphics_highlight_color;
 		break;
 	case COLOR_STATE_HELPTEXT:
 		graphics_current_color = graphics_helptext_color;
 		break;
 	case COLOR_STATE_HEADING:
 		graphics_current_color = graphics_heading_color;
 		break;
 	default:
 		graphics_current_color = graphics_standard_color;
 		break;
     }

     graphics_color_state = state;
 }

 void
 graphics_setcolor (int normal_color, int highlight_color, int helptext_color, int heading_color)
 {
     graphics_normal_color = normal_color;
     graphics_highlight_color = highlight_color;
     graphics_helptext_color = helptext_color;
     graphics_heading_color = heading_color;

     graphics_setcolorstate (graphics_color_state);
 }

 int
 graphics_setcursor (int on)
 {
     /* FIXME: we don't have a cursor in graphics */
     return 0;
 }

 /* Read in the splashscreen image and set the palette up appropriately.
  * Format of splashscreen is an xpm (can be gzipped) with 16 colors and
  * 640x480. */
 static int
 read_image (char *s)
 {
     char buf[32], pal[16];
     unsigned char c, base, mask;
     unsigned i, len, idx, colors, x, y, width, height;

     unsigned char *s1 = (unsigned char*)VSHADOW1;
     unsigned char *s2 = (unsigned char*)VSHADOW2;
     unsigned char *s4 = (unsigned char*)VSHADOW4;
     unsigned char *s8 = (unsigned char*)VSHADOW8;

     if (! grub_open(s))
     {
 	errnum = 0;
 	//graphics_set_palette(1, 0, 0, 0);

 	for (i = 0; i < 38400 / 4; i++)
 		((long *)s1)[i] = ((long *)s2)[i] = ((long *)s4)[i] = ((long *)s8)[i] = 0;

 	//for (y = 0, len = 0; y < 480; y++, len += 80) {
 	//    for (x = 0; x < 640; x++) {
 	//	s1[len + (x >> 3)] |= 0x80 >> (x & 7);
 	//    }
 	//}

         goto set_palette;	//return 0;
     }

     /* read header */
     if (! grub_read((unsigned long long)(unsigned int)(char*)&buf, 10, 0xedde0d90) || grub_memcmp(buf, "/* XPM */\n", 10)) {
         grub_close();
         return 0;
     }

     /* parse info */
     while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90)) {
         if (c == '"')
             break;
     }

     while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && (c == ' ' || c == '\t'))
         ;

     i = 0;
     width = c - '0';
     while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90)) {
         if (c >= '0' && c <= '9')
             width = width * 10 + c - '0';
         else
             break;
     }
     while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && (c == ' ' || c == '\t'))
         ;

     height = c - '0';
     while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90)) {
         if (c >= '0' && c <= '9')
             height = height * 10 + c - '0';
         else
             break;
     }
     while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && (c == ' ' || c == '\t'))
         ;

     colors = c - '0';
     while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90)) {
         if (c >= '0' && c <= '9')
             colors = colors * 10 + c - '0';
         else
             break;
     }

     base = 0;
     while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && c != '"')
         ;

     /* palette */
     for (i = 0, idx = 1; i < colors; i++) {
         len = 0;

         while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && c != '"')
             ;
         grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90);       /* char */
         base = c;
         grub_read((unsigned long long)(unsigned int)buf, 4, 0xedde0d90);      /* \t c # */

         while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && c != '"') {
             if (len < sizeof(buf))
                 buf[len++] = c;
         }

         if (len == 6 && idx < 15) {
             int r = ((hex(buf[0]) << 4) | hex(buf[1])) >> 2;
             int g = ((hex(buf[2]) << 4) | hex(buf[3])) >> 2;
             int b = ((hex(buf[4]) << 4) | hex(buf[5])) >> 2;

             pal[idx] = base;
             graphics_set_palette(idx, r, g, b);
             ++idx;
         }
     }

     x = y = len = 0;

     for (i = 0; i < 38400 / 4; i++)
 	((long *)s1)[i] = ((long *)s2)[i] = ((long *)s4)[i] = ((long *)s8)[i] = 0;

     /* parse xpm data */
     while (y < height) {
         while (1) {
             if (!grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90)) {
                 grub_close();
                 return 0;
             }
             if (c == '"')
                 break;
         }

         while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && c != '"') {
             for (i = 1; i < 15; i++)
                 if (pal[i] == c) {
                     c = i;
                     break;
                 }

             mask = 0x80 >> (x & 7);
             if (c & 1)
                 s1[len + (x >> 3)] |= mask;
             if (c & 2)
                 s2[len + (x >> 3)] |= mask;
             if (c & 4)
                 s4[len + (x >> 3)] |= mask;
             if (c & 8)
                 s8[len + (x >> 3)] |= mask;

             if (++x >= 640) {
                 x = 0;

                 if (y < 480)
                     len += 80;
                 ++y;
             }
         }
     }

     grub_close();

 set_palette:

     graphics_set_palette(0, (background >> 16), (background >> 8) & 63,
                 background & 63);
     graphics_set_palette(15, (foreground >> 16), (foreground >> 8) & 63,
                 foreground & 63);
     graphics_set_palette(0x11, (border >> 16), (border >> 8) & 63,
                          border & 63);

     return 1;
 }


 /* Convert a character which is a hex digit to the appropriate integer */
 int
 hex (int v)
 {
     if (v >= 'A' && v <= 'F')
         return (v - 'A' + 10);
     if (v >= 'a' && v <= 'f')
         return (v - 'a' + 10);
     return (v - '0');
 }


 /* move the graphics cursor location to col, row */
 static void
 graphics_setxy (int col, int row)
 {
     if (col >= x0 && col < x1)
     {
         fontx = col;
         cursorX = col << 3;
     }

     if (row >= y0 && row < y1)
     {
         fonty = row;
         cursorY = row << 4;
     }
 }

 /* scroll the screen */
 static void
 graphics_scroll (void)
 {
     int i, j;

     /* we don't want to scroll recursively... that would be bad */
     if (no_scroll)
         return;
     no_scroll = 1;

     /* move everything up a line */
     for (j = y0 + 1; j < y1; j++)
     {
         graphics_gotoxy (x0, j - 1);

         for (i = x0; i < x1; i++)
        	{
             graphics_putchar (text[j * 80 + i]);
         }
     }

     /* last line should be blank */
     graphics_gotoxy (x0, y1 - 1);

     for (i = x0; i < x1; i++)
         graphics_putchar (' ');

     graphics_setxy (x0, y1 - 1);

     no_scroll = 0;
 }


 static unsigned char chr[16 << 2];
 static unsigned char mask[16];

 static void
 graphics_cursor (int set)
 {
     unsigned char *pat, *mem, *ptr;
     int i, ch, offset;
     int invert = 0;

     if (set && no_scroll)
         return;

     offset = cursorY * 80 + fontx;
     ch = text[fonty * 80 + fontx] & 0xff;
     if (ch != ' ' || ! disable_space_highlight)
 	invert = (text[fonty * 80 + fontx] & /*0xff00*/ 0xffff0000) != 0;
     pat = font8x16 + (ch << 4);

     mem = (unsigned char*)VIDEOMEM + offset;

     if (set)
     {
         MapMask(15);
         ptr = mem;
         for (i = 0; i < 16; i++, ptr += 80)
        	{
             cursorBuf[i] = pat[i];
             *ptr = ~pat[i];
         }
         return;
     }

     if (outline)
       for (i = 0; i < 16; i++)
       {
         mask[i] = pat[i];
 	if (i < 15)
 		mask[i] |= pat[i+1];
 	if (i > 0)
 		mask[i] |= pat[i-1];
         mask[i] |= (mask[i] << 1) | (mask[i] >> 1);
 	mask[i] = ~(mask[i]);
       }

     for (i = 0; i < 16; i++, offset += 80)
     {
 	unsigned char m, p, c1, c2, c4, c8;

 	p = pat[i];

 	if (invert)
 	{
 		p = ~p;
 		chr[i     ] = p;
 		chr[16 + i] = p;
 		chr[32 + i] = p;
 		chr[48 + i] = p;
 		continue;
 	}

 	c1 = ((unsigned char*)VSHADOW1)[offset];
 	c2 = ((unsigned char*)VSHADOW2)[offset];
 	c4 = ((unsigned char*)VSHADOW4)[offset];
 	c8 = ((unsigned char*)VSHADOW8)[offset];

 	if (outline)
 	{
 		m = mask[i];

 		c1 &= m;
 		c2 &= m;
 		c4 &= m;
 		c8 &= m;
 	}

 	c1 |= p;
 	c2 |= p;
 	c4 |= p;
 	c8 |= p;

 #if 0
         if (invert)
 	{
 		c1 = ~c1;
 		c2 = ~c2;
 		c4 = ~c4;
 		c8 = ~c8;
 	}
 #endif

 	chr[i     ] = c1;
 	chr[16 + i] = c2;
 	chr[32 + i] = c4;
 	chr[48 + i] = c8;
     }

     offset = 0;
     for (i = 1; i < 16; i <<= 1, offset += 16)
     {
         int j;

         MapMask(i);
         ptr = mem;
         for (j = 0; j < 16; j++, ptr += 80)
             *ptr = chr[j + offset];
     }

     MapMask(15);
 }

 #endif /* SUPPORT_GRAPHICS */
	/* graphics.c - graphics mode support for GRUB */
	/* Implemented as a terminal type by Jeremy Katz <katzj@redhat.com> based
	* on a patch by Paulo César Pereira de Andrade <pcpa@conectiva.com.br>
	*/
	/*
	* GRUB -- GRand Unified Bootloader
	* Copyright (C) 2001,2002 Red Hat, Inc.
	* Portions copyright (C) 2000 Conectiva, Inc.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/



	#ifdef SUPPORT_GRAPHICS

	#include <term.h>
	#include <shared.h>
	#include <graphics.h>

	static int saved_videomode = 0;
	extern unsigned char *font8x16;

	int outline = 0;
	int disable_space_highlight = 0;
	extern int graphics_inited;
	char splashimage[64];

	#define VSHADOW VSHADOW1
	/* 8x16 dot array, total chars = 8030. plano size = 803016 = 38400 bytes /
	static unsigned char VSHADOW1 = (unsigned char )0x3A0000; //unsigned char VSHADOW1[38400];
	static unsigned char VSHADOW2 = (unsigned char )0x3A9600; //unsigned char VSHADOW2[38400];
	static unsigned char VSHADOW4 = (unsigned char )0x3B2C00; //unsigned char VSHADOW4[38400];
	static unsigned char VSHADOW8 = (unsigned char )0x3BC200; //unsigned char VSHADOW8[38400];
	/* text buffer has to be kept around so that we can write things as we
	* scroll and the like */
	//static unsigned short text[80 * 30];
	static unsigned long text = (unsigned long )0x3C5800; // length in bytes = 80304

	/* constants to define the viewable area */
	const int x0 = 0;
	const int x1 = 80;
	const int y0 = 0;
	const int y1 = 30;

	/* why do these have to be kept here? */
	int foreground = (63 << 16) \| (63 << 8) \| (63), background = 0, border = 0;

	/* current position */
	extern int fontx;
	extern int fonty;

	/* global state so that we don't try to recursively scroll or cursor */
	static int no_scroll = 0;

	/* color state */
	static int graphics_standard_color = A_NORMAL;
	static int graphics_normal_color = A_NORMAL;
	static int graphics_highlight_color = A_REVERSE;
	static int graphics_helptext_color = A_NORMAL;
	static int graphics_heading_color = A_NORMAL;
	static int graphics_current_color = A_NORMAL;
	static color_state graphics_color_state = COLOR_STATE_STANDARD;


	/* graphics local functions */
	static void graphics_setxy (int col, int row);
	static void graphics_scroll (void);
	static int read_image (char *s);
	extern void (*graphics_CURSOR) (int set);
	/* FIXME: where do these really belong? */
	static inline void outb(unsigned short port, unsigned char val)
	{
	__asm __volatile ("outb %0,%1"::"a" (val), "d" (port));
	}

	static void MapMask(int value) {
	outb(0x3c4, 2);
	outb(0x3c5, value);
	}

	/* bit mask register */
	static void BitMask(int value) {
	outb(0x3ce, 8);
	outb(0x3cf, value);
	}



	///* Set the splash image */
	//void graphics_set_splash(char *splashfile) {
	// grub_strcpy(splashimage, splashfile);
	//}

	///* Get the current splash image */
	//char *graphics_get_splash(void) {
	// return splashimage;
	//}

	/* Initialize a vga16 graphics display with the palette based off of
	* the image in splashimage. If the image doesn't exist, leave graphics
	* mode. */
	int
	graphics_init (void)
	{
	/* graphics mode will corrupt the extended memory. so we should
	* invalidate the kernel_type. */
	kernel_type = KERNEL_TYPE_NONE;
	if (! graphics_CURSOR) graphics_CURSOR = (void *)&graphics_cursor;

	if (! graphics_inited)
	{
	saved_videomode = set_videomode (0x12);
	}

	if (! read_image (splashimage))
	{
	set_videomode (saved_videomode);
	grub_printf("failed to read image\n");
	return 0;
	}

	font8x16 = (unsigned char ) graphics_get_font (); / code in asm.S */

	graphics_inited = 1;

	/* make sure that the highlight color is set correctly */
	graphics_highlight_color = ((graphics_normal_color >> 4) \|
	((graphics_normal_color & 0xf) << 4));

	return 1;
	}

	/* Leave graphics mode */
	void
	graphics_end (void)
	{
	if (graphics_inited)
	{
	set_videomode (saved_videomode);
	graphics_inited = 0;
	}
	}

	/* Print ch on the screen. Handle any needed scrolling or the like */
	void
	graphics_putchar (int ch)
	{
	ch &= 0xff;

	//graphics_CURSOR(0);

	if (ch == '\n') {
	if (fonty + 1 < y1)
	graphics_gotoxy(fontx, fonty + 1);
	else
	{
	graphics_CURSOR(0);
	graphics_scroll();
	graphics_CURSOR(1);
	}
	//graphics_CURSOR(1);
	return;
	} else if (ch == '\r') {
	graphics_gotoxy(x0, fonty);
	//graphics_CURSOR(1);
	return;
	}

	//graphics_CURSOR(0);

	text[fonty * 80 + fontx] = ch;
	text[fonty * 80 + fontx] &= 0x00ff;
	if (graphics_current_color & 0xf0)
	text[fonty * 80 + fontx] \|= 0x10000;//0x100;

	graphics_CURSOR(0);

	if ((fontx + 1) >= x1)
	{
	if (fonty + 1 < y1)
	graphics_setxy(x0, fonty + 1);
	else
	{
	graphics_setxy(x0, fonty);
	graphics_scroll();
	}
	} else {
	graphics_setxy(fontx + 1, fonty);
	}

	graphics_CURSOR(1);
	}

	/* get the current location of the cursor */
	int
	graphics_getxy(void)
	{
	return (fontx << 8) \| fonty;
	}

	void
	graphics_gotoxy (int x, int y)
	{
	graphics_CURSOR(0);

	graphics_setxy(x, y);

	graphics_CURSOR(1);
	}

	void
	graphics_cls (void)
	{
	int i;
	unsigned char mem, s1, s2, s4, *s8;

	graphics_CURSOR(0);
	graphics_gotoxy(x0, y0);

	mem = (unsigned char*)VIDEOMEM;
	s1 = (unsigned char*)VSHADOW1;
	s2 = (unsigned char*)VSHADOW2;
	s4 = (unsigned char*)VSHADOW4;
	s8 = (unsigned char*)VSHADOW8;

	for (i = 0; i < 80 * 30; i++)
	text[i] = ' ';
	graphics_CURSOR(1);

	BitMask(0xff);

	/* plano 1 */
	MapMask(1);
	grub_memcpy(mem, s1, 38400);

	/* plano 2 */
	MapMask(2);
	grub_memcpy(mem, s2, 38400);

	/* plano 3 */
	MapMask(4);
	grub_memcpy(mem, s4, 38400);

	/* plano 4 */
	MapMask(8);
	grub_memcpy(mem, s8, 38400);

	MapMask(15);

	}

	void
	graphics_setcolorstate (color_state state)
	{
	switch (state)
	{
	case COLOR_STATE_STANDARD:
	graphics_current_color = graphics_standard_color;
	break;
	case COLOR_STATE_NORMAL:
	graphics_current_color = graphics_normal_color;
	break;
	case COLOR_STATE_HIGHLIGHT:
	graphics_current_color = graphics_highlight_color;
	break;
	case COLOR_STATE_HELPTEXT:
	graphics_current_color = graphics_helptext_color;
	break;
	case COLOR_STATE_HEADING:
	graphics_current_color = graphics_heading_color;
	break;
	default:
	graphics_current_color = graphics_standard_color;
	break;
	}

	graphics_color_state = state;
	}

	void
	graphics_setcolor (int normal_color, int highlight_color, int helptext_color, int heading_color)
	{
	graphics_normal_color = normal_color;
	graphics_highlight_color = highlight_color;
	graphics_helptext_color = helptext_color;
	graphics_heading_color = heading_color;

	graphics_setcolorstate (graphics_color_state);
	}

	int
	graphics_setcursor (int on)
	{
	/* FIXME: we don't have a cursor in graphics */
	return 0;
	}

	/* Read in the splashscreen image and set the palette up appropriately.
	* Format of splashscreen is an xpm (can be gzipped) with 16 colors and
	* 640x480. */
	static int
	read_image (char *s)
	{
	char buf[32], pal[16];
	unsigned char c, base, mask;
	unsigned i, len, idx, colors, x, y, width, height;

	unsigned char s1 = (unsigned char)VSHADOW1;
	unsigned char s2 = (unsigned char)VSHADOW2;
	unsigned char s4 = (unsigned char)VSHADOW4;
	unsigned char s8 = (unsigned char)VSHADOW8;

	if (! grub_open(s))
	{
	errnum = 0;
	//graphics_set_palette(1, 0, 0, 0);

	for (i = 0; i < 38400 / 4; i++)
	((long )s1)[i] = ((long )s2)[i] = ((long )s4)[i] = ((long )s8)[i] = 0;

	//for (y = 0, len = 0; y < 480; y++, len += 80) {
	// for (x = 0; x < 640; x++) {
	// s1[len + (x >> 3)] \|= 0x80 >> (x & 7);
	// }
	//}

	goto set_palette; //return 0;
	}

	/* read header */
	if (! grub_read((unsigned long long)(unsigned int)(char)&buf, 10, 0xedde0d90) \|\| grub_memcmp(buf, "/ XPM */\n", 10)) {
	grub_close();
	return 0;
	}

	/* parse info */
	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90)) {
	if (c == '"')
	break;
	}

	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && (c == ' ' \|\| c == '\t'))
	;

	i = 0;
	width = c - '0';
	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90)) {
	if (c >= '0' && c <= '9')
	width = width * 10 + c - '0';
	else
	break;
	}
	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && (c == ' ' \|\| c == '\t'))
	;

	height = c - '0';
	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90)) {
	if (c >= '0' && c <= '9')
	height = height * 10 + c - '0';
	else
	break;
	}
	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && (c == ' ' \|\| c == '\t'))
	;

	colors = c - '0';
	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90)) {
	if (c >= '0' && c <= '9')
	colors = colors * 10 + c - '0';
	else
	break;
	}

	base = 0;
	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && c != '"')
	;

	/* palette */
	for (i = 0, idx = 1; i < colors; i++) {
	len = 0;

	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && c != '"')
	;
	grub_read((unsigned long long)(unsigned int)(char )&c, 1, 0xedde0d90); / char */
	base = c;
	grub_read((unsigned long long)(unsigned int)buf, 4, 0xedde0d90); /* \t c # */

	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && c != '"') {
	if (len < sizeof(buf))
	buf[len++] = c;
	}

	if (len == 6 && idx < 15) {
	int r = ((hex(buf[0]) << 4) \| hex(buf[1])) >> 2;
	int g = ((hex(buf[2]) << 4) \| hex(buf[3])) >> 2;
	int b = ((hex(buf[4]) << 4) \| hex(buf[5])) >> 2;

	pal[idx] = base;
	graphics_set_palette(idx, r, g, b);
	++idx;
	}
	}

	x = y = len = 0;

	for (i = 0; i < 38400 / 4; i++)
	((long )s1)[i] = ((long )s2)[i] = ((long )s4)[i] = ((long )s8)[i] = 0;

	/* parse xpm data */
	while (y < height) {
	while (1) {
	if (!grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90)) {
	grub_close();
	return 0;
	}
	if (c == '"')
	break;
	}

	while (grub_read((unsigned long long)(unsigned int)(char *)&c, 1, 0xedde0d90) && c != '"') {
	for (i = 1; i < 15; i++)
	if (pal[i] == c) {
	c = i;
	break;
	}

	mask = 0x80 >> (x & 7);
	if (c & 1)
	s1[len + (x >> 3)] \|= mask;
	if (c & 2)
	s2[len + (x >> 3)] \|= mask;
	if (c & 4)
	s4[len + (x >> 3)] \|= mask;
	if (c & 8)
	s8[len + (x >> 3)] \|= mask;

	if (++x >= 640) {
	x = 0;

	if (y < 480)
	len += 80;
	++y;
	}
	}
	}

	grub_close();

	set_palette:

	graphics_set_palette(0, (background >> 16), (background >> 8) & 63,
	background & 63);
	graphics_set_palette(15, (foreground >> 16), (foreground >> 8) & 63,
	foreground & 63);
	graphics_set_palette(0x11, (border >> 16), (border >> 8) & 63,
	border & 63);

	return 1;
	}


	/* Convert a character which is a hex digit to the appropriate integer */
	int
	hex (int v)
	{
	if (v >= 'A' && v <= 'F')
	return (v - 'A' + 10);
	if (v >= 'a' && v <= 'f')
	return (v - 'a' + 10);
	return (v - '0');
	}


	/* move the graphics cursor location to col, row */
	static void
	graphics_setxy (int col, int row)
	{
	if (col >= x0 && col < x1)
	{
	fontx = col;
	cursorX = col << 3;
	}

	if (row >= y0 && row < y1)
	{
	fonty = row;
	cursorY = row << 4;
	}
	}

	/* scroll the screen */
	static void
	graphics_scroll (void)
	{
	int i, j;

	/* we don't want to scroll recursively... that would be bad */
	if (no_scroll)
	return;
	no_scroll = 1;

	/* move everything up a line */
	for (j = y0 + 1; j < y1; j++)
	{
	graphics_gotoxy (x0, j - 1);

	for (i = x0; i < x1; i++)
	{
	graphics_putchar (text[j * 80 + i]);
	}
	}

	/* last line should be blank */
	graphics_gotoxy (x0, y1 - 1);

	for (i = x0; i < x1; i++)
	graphics_putchar (' ');

	graphics_setxy (x0, y1 - 1);

	no_scroll = 0;
	}


	static unsigned char chr[16 << 2];
	static unsigned char mask[16];

	static void
	graphics_cursor (int set)
	{
	unsigned char pat, mem, *ptr;
	int i, ch, offset;
	int invert = 0;

	if (set && no_scroll)
	return;

	offset = cursorY * 80 + fontx;
	ch = text[fonty * 80 + fontx] & 0xff;
	if (ch != ' ' \|\| ! disable_space_highlight)
	invert = (text[fonty * 80 + fontx] & /0xff00/ 0xffff0000) != 0;
	pat = font8x16 + (ch << 4);

	mem = (unsigned char*)VIDEOMEM + offset;

	if (set)
	{
	MapMask(15);
	ptr = mem;
	for (i = 0; i < 16; i++, ptr += 80)
	{
	cursorBuf[i] = pat[i];
	*ptr = ~pat[i];
	}
	return;
	}

	if (outline)
	for (i = 0; i < 16; i++)
	{
	mask[i] = pat[i];
	if (i < 15)
	mask[i] \|= pat[i+1];
	if (i > 0)
	mask[i] \|= pat[i-1];
	mask[i] \|= (mask[i] << 1) \| (mask[i] >> 1);
	mask[i] = ~(mask[i]);
	}

	for (i = 0; i < 16; i++, offset += 80)
	{
	unsigned char m, p, c1, c2, c4, c8;

	p = pat[i];

	if (invert)
	{
	p = ~p;
	chr[i ] = p;
	chr[16 + i] = p;
	chr[32 + i] = p;
	chr[48 + i] = p;
	continue;
	}

	c1 = ((unsigned char*)VSHADOW1)[offset];
	c2 = ((unsigned char*)VSHADOW2)[offset];
	c4 = ((unsigned char*)VSHADOW4)[offset];
	c8 = ((unsigned char*)VSHADOW8)[offset];

	if (outline)
	{
	m = mask[i];

	c1 &= m;
	c2 &= m;
	c4 &= m;
	c8 &= m;
	}

	c1 \|= p;
	c2 \|= p;
	c4 \|= p;
	c8 \|= p;

	#if 0
	if (invert)
	{
	c1 = ~c1;
	c2 = ~c2;
	c4 = ~c4;
	c8 = ~c8;
	}
	#endif

	chr[i ] = c1;
	chr[16 + i] = c2;
	chr[32 + i] = c4;
	chr[48 + i] = c8;
	}

	offset = 0;
	for (i = 1; i < 16; i <<= 1, offset += 16)
	{
	int j;

	MapMask(i);
	ptr = mem;
	for (j = 0; j < 16; j++, ptr += 80)
	*ptr = chr[j + offset];
	}

	MapMask(15);
	}

	#endif /* SUPPORT_GRAPHICS */