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xwayland: Throttle our cursor surface updates with a frame callback 

In some extreme cases with animated cursors at a high frame rate we
could end up filling the wl_display outgoing buffer and end up with
wl_display_flush() failing.

In any case, using the frame callback to throttle ourselves is the
right thing to do.

Signed-off-by: Rui Matos <tiagomatos@gmail.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Rui Matos 2015-05-27 12:08:45 +02:00 committed by Keith Packard
parent 806470b9f6
commit cbb7eb73b5
3 changed files with 31 additions and 1 deletions
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26
hw/xwayland/xwayland-cursor.c
View File

@ -82,6 +82,23 @@ xwl_unrealize_cursor(DeviceIntPtr device, ScreenPtr screen, CursorPtr cursor)
return xwl_shm_destroy_pixmap(pixmap);
}
static void
frame_callback(void *data,
struct wl_callback *callback,
uint32_t time)
{
struct xwl_seat *xwl_seat = data;
xwl_seat->cursor_frame_cb = NULL;
if (xwl_seat->cursor_needs_update) {
xwl_seat->cursor_needs_update = FALSE;
xwl_seat_set_cursor(xwl_seat);
}
}
static const struct wl_callback_listener frame_listener = {
frame_callback
};
void
xwl_seat_set_cursor(struct xwl_seat *xwl_seat)
{
@ -98,6 +115,11 @@ xwl_seat_set_cursor(struct xwl_seat *xwl_seat)
return;
}
if (xwl_seat->cursor_frame_cb) {
xwl_seat->cursor_needs_update = TRUE;
return;
}
cursor = xwl_seat->x_cursor;
pixmap = dixGetPrivate(&cursor->devPrivates, &xwl_cursor_private_key);
stride = cursor->bits->width * 4;
@ -117,6 +139,10 @@ xwl_seat_set_cursor(struct xwl_seat *xwl_seat)
wl_surface_damage(xwl_seat->cursor, 0, 0,
xwl_seat->x_cursor->bits->width,
xwl_seat->x_cursor->bits->height);
xwl_seat->cursor_frame_cb = wl_surface_frame(xwl_seat->cursor);
wl_callback_add_listener(xwl_seat->cursor_frame_cb, &frame_listener, xwl_seat);
wl_surface_commit(xwl_seat->cursor);
}

2
hw/xwayland/xwayland-input.c
View File

@ -563,6 +563,8 @@ xwl_seat_destroy(struct xwl_seat *xwl_seat)
RemoveDevice(xwl_seat->keyboard, FALSE);
wl_seat_destroy(xwl_seat->seat);
wl_surface_destroy(xwl_seat->cursor);
if (xwl_seat->cursor_frame_cb)
wl_callback_destroy(xwl_seat->cursor_frame_cb);
wl_array_release(&xwl_seat->keys);
free(xwl_seat);
}

4
hw/xwayland/xwayland.h
View File

@ -115,12 +115,14 @@ struct xwl_seat {
struct wl_pointer *wl_pointer;
struct wl_keyboard *wl_keyboard;
struct wl_array keys;
struct wl_surface *cursor;
struct xwl_window *focus_window;
uint32_t id;
uint32_t pointer_enter_serial;
struct xorg_list link;
CursorPtr x_cursor;
struct wl_surface *cursor;
struct wl_callback *cursor_frame_cb;
Bool cursor_needs_update;
size_t keymap_size;
char *keymap;