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Add vga_cursor_refresh(), vga_cursor_on(), vga_cursor_off(): management of cursor on the display

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This commit is contained in:
Laurent Vivier 2005-08-26 09:25:47 +00:00
parent a83e92a120
commit 1a6444a800
2 changed files with 72 additions and 0 deletions
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69
second/vga.c
View File

@ -60,8 +60,68 @@ static unsigned char bits_depth8[2] = {
static vga_handler_t vga;
#define CURSOR_POS 14
#define CURSOR_HIGH 2
static int cursor_on = 0;
static int cursor_state = 0;
extern unsigned char* font_get(int c);
static void
draw_cursor(void)
{
int l,w;
unsigned char *base;
unsigned long x_base;
unsigned long y_base;
y_base = vga.row_bytes * vga.pos_y * 16;
x_base = vga.pos_x * vga.depth;
base = vga.base + y_base + x_base;
base += CURSOR_POS * vga.row_bytes;
for (l = 0 ; l < CURSOR_HIGH ; l++)
{
for (w = 0; w < vga.depth; w++)
base[w] ^= 0xFF;
base += vga.row_bytes;
}
}
static void vga_cursor(int state)
{
if (cursor_state != state)
{
draw_cursor();
cursor_state = state;
}
}
void vga_cursor_refresh(void)
{
if (!cursor_on)
return;
if (Ticks % 60 < 30)
vga_cursor(0);
else
vga_cursor(1);
}
void vga_cursor_on(void)
{
cursor_on = 1;
vga_cursor_refresh();
}
void vga_cursor_off(void)
{
cursor_on = 0;
vga_cursor(0);
}
static void
draw_byte_1(unsigned char *glyph, unsigned char *base)
{
@ -320,11 +380,14 @@ vga_init()
vga.siz_h = vga.height / 16;
vga_clear();
vga_cursor_on();
}
void
vga_put(char c)
{
vga_cursor(0);
switch(c) {
case '\r':
vga.pos_x = 0;
@ -344,6 +407,8 @@ vga_put(char c)
vga_scroll();
vga.pos_y--;
}
vga_cursor_refresh();
}
static void
@ -356,6 +421,8 @@ vga_clear()
unsigned long *base;
unsigned char *next;
vga_cursor(0);
if (vga.depth <= 8)
{
bg = 0xff;
@ -381,6 +448,8 @@ vga_clear()
vga.pos_x = 0;
vga.pos_y = 0;
vga_cursor_refresh();
}
unsigned long vga_get_videobase()

3
second/vga.h
View File

@ -11,6 +11,9 @@ extern void vga_init();
extern void vga_put(char c);
extern void vga_print(char *s);
extern void vga_cursor_refresh(void);
extern void vga_cursor_on(void);
extern void vga_cursor_off(void);
extern unsigned long vga_get_videobase();
extern unsigned long vga_get_row_bytes();