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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
No known key found for this signature in database
GPG key ID: 5BBD4992C116573F
6 changed files with 170 additions and 210 deletions
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19
terminal.h
View file

@ -28,9 +28,12 @@ struct cell {
struct attributes attrs;
};
enum damage_type {DAMAGE_UPDATE, DAMAGE_UPDATE_NO_SCROLL,
DAMAGE_ERASE, DAMAGE_ERASE_NO_SCROLL,
DAMAGE_SCROLL, DAMAGE_SCROLL_REVERSE};
struct scroll_region {
int start;
int end;
};
enum damage_type {DAMAGE_UPDATE, DAMAGE_ERASE, DAMAGE_SCROLL, DAMAGE_SCROLL_REVERSE};
struct damage {
enum damage_type type;
union {
@ -42,7 +45,7 @@ struct damage {
/* DAMAGE_SCROLL, DAMAGE_SCROLL_REVERSE */
struct {
int offset;
struct scroll_region region;
int lines;
} scroll;
};
@ -54,12 +57,7 @@ struct grid {
int cell_width;
int cell_height;
/* Scrolling region - counted as lines excluded from scrolling,
* from top and from bottom */
struct {
int start;
int end;
} scrolling_region;
struct scroll_region scroll_region;
int linear_cursor;
struct {
@ -80,6 +78,7 @@ struct grid {
uint32_t background;
tll(struct damage) damage;
tll(struct damage) scroll_damage;
};
struct vt_subparams {