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render: throttle xcursor updates

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With a bad behaving client (e.g. 'less' with mouse support enabled),
we can end up with a *lot* of xcursor updates (so much, that we
flooded the wayland socket before we implemented a blocking
wayl_flush()).

Since there's little point in updating the cursor more than once per
frame interval, use frame callbacks to throttle the updates.

This works more or lesslike normal terminal refreshes:

render_xcursor_set() stores the last terminal (window) that had (and
updated) the cursor.

The renderer's FDM hook checks if we have such a pending terminal set,
and if so, tries to refresh the cursor.

This is done by first checking if we're already waiting for a callback
from a previous cursor update, and if so we do nothing; the callback
will update the cursor for the next frame. If we're *not* already
waiting for a callback, we update the cursor immediately.
This commit is contained in:
Daniel Eklöf 2020-01-04 22:01:19 +01:00
parent 040a1cd00d
commit 5ec447697c
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GPG key ID: 5BBD4992C116573F
5 changed files with 136 additions and 76 deletions
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6
wayland.h
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@ -152,6 +152,9 @@ struct wayland {
int size;
char *theme_name;
const char *xcursor;
const struct terminal *pending_terminal;
struct wl_callback *xcursor_callback;
} pointer;
struct {
@ -184,8 +187,5 @@ void wayl_roundtrip(struct wayland *wayl);
struct terminal *wayl_terminal_from_surface(
struct wayland *wayl, struct wl_surface *surface);
/* TODO: pass something other than 'term'? Need scale... */
bool wayl_cursor_set(struct wayland *wayl, const struct terminal *term);
struct wl_window *wayl_win_init(struct terminal *term);
void wayl_win_destroy(struct wl_window *win);