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render: scroll: use shm scrolling even though we have a top region

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Daniel Eklöf 2020-03-23 20:16:19 +01:00
parent 75180cea37
commit 00129b1935
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GPG key ID: 5BBD4992C116573F
1 changed files with 20 additions and 3 deletions
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23
render.c
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@ -551,6 +551,7 @@ grid_render_scroll(struct terminal *term, struct buffer *buf,
gettimeofday(&start_time, NULL);
#endif
uint8_t *raw = buf->mmapped;
int dst_y = term->margins.top + (dmg->scroll.region.start + 0) * term->cell_height;
int src_y = term->margins.top + (dmg->scroll.region.start + dmg->scroll.lines) * term->cell_height;
@ -587,15 +588,26 @@ grid_render_scroll(struct terminal *term, struct buffer *buf,
* SHM. Otherwise use memmove.
*/
bool try_shm_scroll =
dmg->scroll.region.start == 0 &&
dmg->scroll.lines + (term->rows - dmg->scroll.region.end) < term->rows / 2;
shm_can_scroll() && (dmg->scroll.lines +
dmg->scroll.region.start +
(term->rows - dmg->scroll.region.end)) < term->rows / 2;
bool did_shm_scroll = false;
//try_shm_scroll = false;
//try_shm_scroll = true;
/* TODO: this could easily use up all stack */
uint8_t top_region[dmg->scroll.region.start * term->cell_height * buf->stride];
if (try_shm_scroll) {
if (dmg->scroll.region.start > 0) {
/* Store a copy of the top region - we need to restore it after scrolling */
memcpy(top_region,
(uint8_t *)buf->mmapped + term->margins.top * buf->stride,
sizeof(top_region));
}
did_shm_scroll = shm_scroll(
term->wl->shm, buf, dmg->scroll.lines * term->cell_height);
@ -620,6 +632,12 @@ grid_render_scroll(struct terminal *term, struct buffer *buf,
*/
if (did_shm_scroll) {
/* Mmap changed - update buffer pointer */
raw = buf->mmapped;
/* Restore top scrolling region */
memcpy(raw + term->margins.top * buf->stride, top_region, sizeof(top_region));
/* Restore bottom scrolling region */
if (dmg->scroll.region.end < term->rows) {
int src = dmg->scroll.region.end - dmg->scroll.lines;
@ -629,7 +647,6 @@ grid_render_scroll(struct terminal *term, struct buffer *buf,
LOG_DBG("memmoving %zu lines of scroll region", amount);
assert(src >= 0);
uint8_t *raw = buf->mmapped;
memmove(
raw + (term->margins.top + dst * term->cell_height) * buf->stride,
raw + (term->margins.top + src * term->cell_height) * buf->stride,