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#include "video.h"
#include "io.h"
#include "common.h"
#include "memory.h"
static uint8 video_attr=7;
static uint8 *videohidden = 0;
static const uint8 hextab[16] = {'0','1','2','3','4','5','6','7',
'8','9','A','B','C','D','E','F'};
void video_usecolor(uint8 fg, uint8 bg)
{
video_attr = (fg & 15) | (bg << 4);
};
void video_putchar(int32 x, int32 y, uint8 code)
{
if ((x<0) || (y<0) || (x>=80) || (y>=25)) return;
videohidden [ (y*80+x)*2 ] = code;
videohidden [ (y*80+x)*2 +1 ] = video_attr;
};
void video_fill(int32 x, int32 y, int32 width, int32 height, uint8 code)
{
int32 a, b;
for (a = x; a < x+width; ++a)
for (b = y; b < y+height; ++b)
video_putchar (a, b, code);
};
void video_puthex8(int32 x, int32 y, uint8 hex)
{
video_putchar(x,y,hextab[hex>>4]);
video_putchar(x+1,y,hextab[hex&15]);
};
void video_putstring(int32 x, int32 y, uint8 *str)
{
while (*str) video_putchar(x++,y,*(str++));
};
void video_update()
{
memcpy ((uint8*)0xb8000, videohidden, 80*25*2);
};
void video_setcolor(uint8 colnum, uint8 red, uint8 green, uint8 blue)
{
const uint8 tab[16]={0,1,2,3,4,5,0x14,7,0x38,0x39,0x3a,
0x3b,0x3c,0x3d,0x3e,0x3f};
if (colnum>=16) return;
outb(tab[colnum],0x3c8);
outb(red,0x3c9);
outb(green,0x3c9);
outb(blue,0x3c9);
};
void video_blinkchars(bool onoff)
{
// FIXME I BUGGY ON SOME VIDEO CARDS
uint8 a;
inb(0x3da);
outb(0x10,0x3c0);
a=inb(0x3c1);
if (onoff) a |= 8; else a &= ~8;
outb(a,0x3c1);
outb(32,0x3c0);
};
static void video_visiblecursor (bool onoff)
{
uint8 a;
outb(0xa, 0x3d4);
a = inb(0x3d5);
if (onoff) a &= ~32; else a |= 32;
outb(0xa, 0x3d4);
outb(a, 0x3d5);
};
void video_hidecursor()
{
video_visiblecursor (false);
};
void video_poscursor(int32 x, int32 y)
{
if ((x<0) || (y<0) || (x>=80) || (y>=25)) {
video_hidecursor ();
}else{
uint16 c;
c = y*80+x;
outb(0xe,0x3d4);
outb(c>>8,0x3d5);
outb(0xf,0x3d4);
outb(c&255,0x3d5);
video_visiblecursor(true);
};
};
void video_initialize()
{
videohidden = malloc (80*25*2);
};
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