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render: performance improvements during interactive resize

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Instead of copying the entire grid when an interactive resize is
started, stash the complete grid (to be used in the final reflow).

Copy the current viewport only, to be used during the interactive
resize.

This gets rid of the initial "pause" when snapshotting the grid when
an interactive resize is started.
This commit is contained in:
Daniel Eklöf 2022-10-06 17:09:32 +02:00
parent 8179d73daa
commit 3565cbd636
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GPG key ID: 5BBD4992C116573F
1 changed files with 38 additions and 6 deletions
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44
render.c
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@ -3900,13 +3900,45 @@ maybe_resize(struct terminal *term, int width, int height, bool force)
* the original grid, before the resize started.
*/
if (term->window->is_resizing && term->render.resizing.grid == NULL) {
/*
* TODO: snapshotting a large grid is slow. To improve, move
* normal -> resizing.grid, and instantiate a small (screen
* sized) new “normal”
*/
term->render.resizing.grid = grid_snapshot(&term->normal);
/* Stash the current ‘normal’ grid, as-is, to be used when
* doing the final reflow */
term->render.resizing.screen_rows = term->rows;
term->render.resizing.grid = xmalloc(sizeof(*term->render.resizing.grid));
*term->render.resizing.grid = term->normal;
/*
* Copy the current viewport to a new grid that will be used
* during the resize. For now, throw away sixels and OSC-8
* URLs. They’ll be "restored" when we do the final reflow.
*
* TODO:
* - sixels?
* - OSC-8?
*/
struct grid g = {
.num_rows = 1 << (32 - __builtin_clz(term->rows - 1)),
.num_cols = term->cols,
.offset = 0,
.view = 0,
.cursor = term->normal.cursor,
.saved_cursor = term->normal.saved_cursor,
.rows = xcalloc(g.num_rows, sizeof(g.rows[0])),
.cur_row = NULL,
.scroll_damage = tll_init(),
.sixel_images = tll_init(),
.kitty_kbd = term->normal.kitty_kbd,
};
for (size_t i = 0, j = term->normal.view; i < term->rows;
i++, j = (j + 1) & (term->normal.num_rows - 1))
{
g.rows[i] = grid_row_alloc(term->cols, false);
memcpy(g.rows[i]->cells, term->normal.rows[j]->cells,
term->cols * sizeof(g.rows[i]->cells[0]));
}
term->normal = g;
}
/* Screen rows/cols before resize */