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scroll-region: don't clear damage queue when changing scroll region

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Vim, for example, changes the scroll region every time you scroll a
single line. Thus, resetting the damage queue is slow.

This reworks the damage handling of scroll updates:

* Split damage queue into two: one for scroll operations and one for
  update/erase operations.
* Don't separate update/erase operations inside/outside the scroll
  region
* Store the current scroll region in the scroll damage operation. This
  allows us to stack multiple scroll operations with different scroll
  regions.
* When updating update/erase operations after a scroll operation,
  split the update/erase operations if necessary (the current scroll
  operation may have a scroll region different from before, thus
  forcing us to split existing update/erase operations.
* The renderer no longer erases after a scroll. The scroll operation
  also adds an erase operation. This also means that erase operation
  are subject to adjustments by later scroll operations.
This commit is contained in:
Daniel Eklöf 2019-06-25 20:11:08 +02:00
parent 0f76f4190a
commit a35738d96f
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GPG key ID: 5BBD4992C116573F
6 changed files with 170 additions and 210 deletions
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4
vt.c
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@ -604,7 +604,7 @@ action(struct terminal *term, enum action action, uint8_t c)
LOG_DBG("execute: 0x%02x", c);
switch (c) {
case '\n':
if (term->grid.cursor.row == term->grid.scrolling_region.end - 1) {
if (term->grid.cursor.row == term->grid.scroll_region.end - 1) {
grid_scroll(&term->grid, 1);
} else
grid_cursor_down(&term->grid, 1);
@ -638,7 +638,7 @@ action(struct terminal *term, enum action action, uint8_t c)
case ACTION_PRINT: {
if (term->grid.print_needs_wrap) {
if (term->grid.cursor.row == term->grid.scrolling_region.end - 1) {
if (term->grid.cursor.row == term->grid.scroll_region.end - 1) {
grid_scroll(&term->grid, 1);
grid_cursor_to(&term->grid, term->grid.cursor.row, 0);
} else