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Add support for 24bpp frame buffer.

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This commit is contained in:
Martin Whitaker 2020-07-09 15:51:04 +01:00
parent fd7f4be912
commit 725435d5c7
1 changed files with 31 additions and 4 deletions
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35
system/screen.c
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@ -95,7 +95,7 @@ static void lfb8_put_char(int row, int col, uint8_t ch, uint8_t attr)
for (int y = 0; y < FONT_HEIGHT; y++) {
uint8_t font_row = font_data[ch][y];
for (int x = 0; x < FONT_WIDTH; x++) {
pixel_row[x] = font_row & 0x80 ? fg_colour : bg_colour;
pixel_row[x] = font_row & 0x80 ? fg_colour : bg_colour;
font_row <<= 1;
}
pixel_row += lfb_stride;
@ -114,7 +114,29 @@ static void lfb16_put_char(int row, int col, uint8_t ch, uint8_t attr)
for (int y = 0; y < FONT_HEIGHT; y++) {
uint8_t font_row = font_data[ch][y];
for (int x = 0; x < FONT_WIDTH; x++) {
pixel_row[x] = font_row & 0x80 ? fg_colour : bg_colour;
pixel_row[x] = font_row & 0x80 ? fg_colour : bg_colour;
font_row <<= 1;
}
pixel_row += lfb_stride;
}
}
static void lfb24_put_char(int row, int col, uint8_t ch, uint8_t attr)
{
shadow_buffer[row][col].ch = ch;
shadow_buffer[row][col].attr = attr;
uint32_t fg_colour = lfb_pallete[attr % 16];
uint32_t bg_colour = lfb_pallete[attr / 16];
uint8_t *pixel_row = (uint8_t *)lfb_base + row * FONT_HEIGHT * lfb_stride + col * FONT_WIDTH * 3;
for (int y = 0; y < FONT_HEIGHT; y++) {
uint8_t font_row = font_data[ch][y];
for (int x = 0; x < FONT_WIDTH * 3; x += 3) {
uint32_t colour = font_row & 0x80 ? fg_colour : bg_colour;
pixel_row[x+0] = colour & 0xff; colour >>= 8;
pixel_row[x+1] = colour & 0xff; colour >>= 8;
pixel_row[x+2] = colour & 0xff;
font_row <<= 1;
}
pixel_row += lfb_stride;
@ -133,7 +155,7 @@ static void lfb32_put_char(int row, int col, uint8_t ch, uint8_t attr)
for (int y = 0; y < FONT_HEIGHT; y++) {
uint8_t font_row = font_data[ch][y];
for (int x = 0; x < FONT_WIDTH; x++) {
pixel_row[x] = font_row & 0x80 ? fg_colour : bg_colour;
pixel_row[x] = font_row & 0x80 ? fg_colour : bg_colour;
font_row <<= 1;
}
pixel_row += lfb_stride;
@ -171,6 +193,9 @@ void screen_init(void)
} else if (lfb_depth <= 16) {
lfb_bytes_per_pixel = 2;
put_char = lfb16_put_char;
} else if (lfb_depth <= 24) {
lfb_bytes_per_pixel = 3;
put_char = lfb24_put_char;
} else {
lfb_bytes_per_pixel = 4;
put_char = lfb32_put_char;
@ -205,7 +230,9 @@ void screen_init(void)
lfb_base += (excess_height / 2) * lfb_stride;
}
lfb_stride /= lfb_bytes_per_pixel;
if (lfb_bytes_per_pixel != 3) {
lfb_stride /= lfb_bytes_per_pixel;
}
// Initialise the pallete.
uint32_t r_max = (1 << screen_info->red_size ) - 1;