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scrollback: use scroll damage to speed up scrolling

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When scrolling through the scrollback lines, use scroll damage instead
of re-rendering the entire screen whenever it makes sense. I.e. when
the number of lines isn't a whole page or more.
This commit is contained in:
Daniel Eklöf 2019-08-04 19:06:49 +02:00
parent c411dedc3b
commit 42fdb3653d
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GPG key ID: 5BBD4992C116573F
1 changed files with 24 additions and 2 deletions
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26
commands.c
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@ -59,9 +59,20 @@ cmd_scrollback_up(struct terminal *term, int rows)
if (new_view == term->grid->view)
return;
int diff = -1;
if (new_view < term->grid->view)
diff = term->grid->view - new_view;
else
diff = (term->grid->num_rows - new_view) + term->grid->view;
term->grid->view = new_view;
term_damage_view(term);
if (diff >= 0 && diff < term->rows) {
term_damage_scroll(term, DAMAGE_SCROLL_REVERSE, (struct scroll_region){0, term->rows}, diff);
term_damage_rows_in_view(term, 0, diff - 1);
} else
term_damage_view(term);
render_refresh(term);
}
@ -118,8 +129,19 @@ cmd_scrollback_down(struct terminal *term, int rows)
if (new_view == term->grid->view)
return;
int diff = -1;
if (new_view > term->grid->view)
diff = new_view - term->grid->view;
else
diff = (term->grid->num_rows - term->grid->view) + new_view;
term->grid->view = new_view;
term_damage_view(term);
if (diff >= 0 && diff < term->rows) {
term_damage_scroll(term, DAMAGE_SCROLL, (struct scroll_region){0, term->rows}, diff);
term_damage_rows_in_view(term, term->rows - diff, term->rows - 1);
} else
term_damage_view(term);
render_refresh(term);
}