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gdk: Compress window state events

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If there are already a window state event for a given window queued
when the window state is changed, drop that event and queue a new event
with a changed_mask based on the state before last event that was queue
without compression.

https://bugzilla.gnome.org/show_bug.cgi?id=762468
This commit is contained in:
Jonas Ådahl
2016-02-26 14:10:06 +08:00
parent 956b2ff998
commit 9e2207b2b0
2 changed files with 36 additions and 4 deletions
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39
gdk/gdkevents.c
View File

@ -2159,12 +2159,32 @@ _gdk_event_button_generate (GdkDisplay *display,
}
}
static GList *
gdk_get_pending_window_state_event_link (GdkWindow *window)
{
GdkDisplay *display = gdk_window_get_display (window);
GList *tmp_list;
for (tmp_list = display->queued_events; tmp_list; tmp_list = tmp_list->next)
{
GdkEventPrivate *event = tmp_list->data;
if (event->event.type == GDK_WINDOW_STATE &&
event->event.window_state.window == window)
return tmp_list;
}
return NULL;
}
void
_gdk_set_window_state (GdkWindow *window,
GdkWindowState new_state)
{
GdkDisplay *display = gdk_window_get_display (window);
GdkEvent temp_event;
GdkWindowState old;
GList *pending_event_link;
g_return_if_fail (window != NULL);
@ -2173,11 +2193,22 @@ _gdk_set_window_state (GdkWindow *window,
temp_event.window_state.send_event = FALSE;
temp_event.window_state.new_window_state = new_state;
old = window->state;
if (temp_event.window_state.new_window_state == old)
if (temp_event.window_state.new_window_state == window->state)
return; /* No actual work to do, nothing changed. */
pending_event_link = gdk_get_pending_window_state_event_link (window);
if (pending_event_link)
{
old = window->old_state;
_gdk_event_queue_remove_link (display, pending_event_link);
g_list_free_1 (pending_event_link);
}
else
{
old = window->state;
window->old_state = old;
}
temp_event.window_state.changed_mask = new_state ^ old;
/* Actually update the field in GdkWindow, this is sort of an odd
@ -2199,7 +2230,7 @@ _gdk_set_window_state (GdkWindow *window,
{
case GDK_WINDOW_TOPLEVEL:
case GDK_WINDOW_TEMP: /* ? */
gdk_display_put_event (gdk_window_get_display (window), &temp_event);
gdk_display_put_event (display, &temp_event);
break;
case GDK_WINDOW_FOREIGN:
case GDK_WINDOW_ROOT:

1
gdk/gdkinternals.h
View File

@ -315,6 +315,7 @@ struct _GdkWindow
/* We store the old expose areas to support buffer-age optimizations */
cairo_region_t *old_updated_area[2];
GdkWindowState old_state;
GdkWindowState state;
guint8 alpha;