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terminal-vga: improve performance, especially when running dumb stuff like 'yes'

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This commit is contained in:
K. Lange 2019-12-15 17:28:02 +09:00
parent 3bf80bf77d
commit 79792237fb
1 changed files with 11 additions and 5 deletions
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16
apps/terminal-vga.c
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@ -395,11 +395,14 @@ void input_buffer_stuff(char * str) {
}
unsigned short * textmemptr = (unsigned short *)0xB8000;
unsigned short * mirrorcopy = NULL;
void placech(unsigned char c, int x, int y, int attr) {
unsigned short *where;
unsigned att = attr << 8;
where = textmemptr + (y * 80 + x);
*where = c | att;
unsigned int where = y * term_width + x;
unsigned int att = (c | (attr << 8));
if (mirrorcopy[where] != att) {
mirrorcopy[where] = att;
textmemptr[where] = att;
}
}
/* ANSI-to-VGA */
@ -491,7 +494,8 @@ void draw_cursor() {
render_cursor();
}
void term_redraw_all() {
void term_redraw_all() {
/* Redraw to a temp buffer */
for (uint16_t y = 0; y < term_height; ++y) {
for (uint16_t x = 0; x < term_width; ++x) {
cell_redraw(x,y);
@ -919,6 +923,8 @@ void reinit(void) {
memset(term_buffer_b, 0x0, sizeof(term_cell_t) * term_width * term_height);
term_buffer = term_buffer_a;
mirrorcopy = malloc(sizeof(unsigned short) * term_width * term_height);
memset(mirrorcopy, 0, sizeof(unsigned short) * term_width * term_height);
}
ansi_state = ansi_init(ansi_state, term_width, term_height, &term_callbacks);