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ui/frames: Simplify client area control computation

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Ungrabbed pointer motion events over a client window area don't even
reach mutter in X compositor mode, but as a wayland compositor we
process those events which ends up in a call stack like:

- meta_window_handle_ungrabbed_event
 - meta_ui_frame_handle_event
  - handle_motion_notify_event
   - get_control
    - meta_ui_frame_calc_geometry

Computing frame geometry is a relatively CPU expensive operation and
doing it on every motion event over a client window is pointless work
since we aren't going to change the cursor or prelight any frame
widget.

This commit special cases the determination of
META_FRAME_CONTROL_CLIENT_AREA using a much faster method. When
continuously moving the pointer over an X (client) window, it results
in a ~40% decrease in mutter cpu usage.

https://bugzilla.gnome.org/show_bug.cgi?id=779436
This commit is contained in:
Rui Matos 2017-02-07 13:39:34 +01:00
parent 1079850621
commit 1f20e82a96
1 changed files with 3 additions and 16 deletions
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19
src/ui/frames.c
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@ -574,19 +574,6 @@ meta_ui_frame_get_borders (MetaUIFrame *frame,
borders);
}
/* The client rectangle surrounds client window; it subtracts both
* the visible and invisible borders from the frame window's size.
*/
static void
get_client_rect (MetaFrameGeometry *fgeom,
cairo_rectangle_int_t *rect)
{
rect->x = fgeom->borders.total.left;
rect->y = fgeom->borders.total.top;
rect->width = fgeom->width - fgeom->borders.total.right - rect->x;
rect->height = fgeom->height - fgeom->borders.total.bottom - rect->y;
}
/* The visible frame rectangle surrounds the visible portion of the
* frame window; it subtracts only the invisible borders from the frame
* window's size.
@ -1609,12 +1596,12 @@ get_control (MetaUIFrame *frame, int root_x, int root_y)
x = root_x - win_x;
y = root_y - win_y;
meta_ui_frame_calc_geometry (frame, &fgeom);
get_client_rect (&fgeom, &client);
meta_window_get_client_area_rect (frame->meta_window, &client);
if (POINT_IN_RECT (x, y, client))
return META_FRAME_CONTROL_CLIENT_AREA;
meta_ui_frame_calc_geometry (frame, &fgeom);
if (POINT_IN_RECT (x, y, fgeom.close_rect.clickable))
return META_FRAME_CONTROL_DELETE;