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gterm: Speed up terminal greatly by only printing on screen characters that changed

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mintsuki 2021-04-08 23:41:35 +02:00
parent 55a88438f4
commit 8bd7cf743c
1 changed files with 4 additions and 2 deletions
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6
stage23/lib/gterm.c
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@ -181,7 +181,8 @@ static void scroll(void) {
clear_cursor();
for (int i = cols; i < rows * cols; i++) {
plot_char_grid(&grid[i], (i - cols) % cols, (i - cols) / cols);
if (memcmp(&grid[i], &grid[i - cols], sizeof(struct gterm_char) != 0))
plot_char_grid(&grid[i], (i - cols) % cols, (i - cols) / cols);
}
// Clear the last line of the screen.
@ -190,7 +191,8 @@ static void scroll(void) {
empty.fg = 9;
empty.bg = 8;
for (int i = rows * cols - cols; i < rows * cols; i++) {
plot_char_grid(&empty, i % cols, i / cols);
if (memcmp(&grid[i], &empty, sizeof(struct gterm_char) != 0))
plot_char_grid(&empty, i % cols, i / cols);
}
draw_cursor();