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#include "vgatxt.h"
#include <core/sys.h>
#include <mem/mem.h>
static uint16_t *video_memory = (uint16_t*)((size_t)K_HIGHHALF_ADDR + 0xB8000);
vgatxt *text_display;
vgatxt::vgatxt(node *parent) : display(parent) {
// nothing to do, really
}
int vgatxt::text_w() {
return 80;
}
int vgatxt::text_h() {
return 25;
}
void vgatxt::text_setcsr(int l, int c, bool visible) {
uint16_t cursor_location = l * 80 + c;
if (!visible) cursor_location = 10000;
outb(0x3D4, 14); //Sending high cursor byte
outb(0x3D5, cursor_location >> 8);
outb(0x3D4, 15); //Sending high cursor byte
outb(0x3D5, cursor_location);
}
void vgatxt::text_put(int l, int c, int ch, uint8_t fgcolor, uint8_t bgcolor) {
if (ch >= 0x80) ch = '?';
video_memory[l * 80 + c] = (char)ch | ((bgcolor << 4 | fgcolor) << 8);
}
void vgatxt::text_scroll(int n, uint8_t fgcolor, uint8_t bgcolor) {
//TODO: optimize
for (int i = 0; i < n; i++) {
uint16_t blank = (((bgcolor << 4) | fgcolor) << 8) | 0x20;
int j;
for (j = 0; j < 80*24; j++) {
video_memory[j] = video_memory[j+80];
}
for (j = 80*24; j < 80*25; j++) {
video_memory[j] = blank;
}
}
}
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