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Code Issues Releases Wiki Activity

stdvga: Rename CGA palette functions 

Rename stdvga_set_border_color() to stdvga_set_cga_background_color()
and stdvga_set_palette() to stdvga_set_cga_palette().  These functions
implement compatibility for old CGA cards - rename them so they are
not confused with the functions that manipulte the VGA palette.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2024-03-31 21:58:12 -04:00
parent 9136808853
commit 2996819f7d
3 changed files with 18 additions and 13 deletions
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23
vgasrc/stdvga.c
View File

@ -18,19 +18,32 @@
* Attribute control
****************************************************************/
// Emulate CGA background setting via VGA palette index registers
void
stdvga_set_border_color(u8 color)
stdvga_set_cga_background_color(u8 color)
{
// Set the background color (via palette index 0)
u8 v1 = color & 0x0f;
if (v1 & 0x08)
v1 += 0x08;
stdvga_attr_write(0x00, v1);
// Dim/brighten foreground (see pal_cga[] in stdvgamodes.c)
int i;
for (i = 1; i < 4; i++)
stdvga_attr_mask(i, 0x10, color & 0x10);
}
// Emulate CGA palette setting by altering VGA palette index registers
void
stdvga_set_cga_palette(u8 palid)
{
// Switch foreground colors (see pal_cga[] in stdvgamodes.c)
int i;
for (i = 1; i < 4; i++)
stdvga_attr_mask(i, 0x01, palid & 0x01);
}
void
stdvga_set_overscan_border_color(u8 color)
{
@ -43,14 +56,6 @@ stdvga_get_overscan_border_color(void)
return stdvga_attr_read(0x11);
}
void
stdvga_set_palette(u8 palid)
{
int i;
for (i = 1; i < 4; i++)
stdvga_attr_mask(i, 0x01, palid & 0x01);
}
void
stdvga_set_all_palette_reg(u16 seg, u8 *data_far)
{

4
vgasrc/stdvga.h
View File

@ -45,10 +45,10 @@
#define SEG_MTEXT 0xB000
// stdvga.c
void stdvga_set_border_color(u8 color);
void stdvga_set_cga_background_color(u8 color);
void stdvga_set_cga_palette(u8 palid);
void stdvga_set_overscan_border_color(u8 color);
u8 stdvga_get_overscan_border_color(void);
void stdvga_set_palette(u8 palid);
void stdvga_set_all_palette_reg(u16 seg, u8 *data_far);
void stdvga_get_all_palette_reg(u16 seg, u8 *data_far);
void stdvga_toggle_intensity(u8 flag);

4
vgasrc/vgabios.c
View File

@ -457,13 +457,13 @@ handle_100a(struct bregs *regs)
static void
handle_100b00(struct bregs *regs)
{
stdvga_set_border_color(regs->bl);
stdvga_set_cga_background_color(regs->bl);
}
static void
handle_100b01(struct bregs *regs)
{
stdvga_set_palette(regs->bl);
stdvga_set_cga_palette(regs->bl);
}
static void