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gdkwindow: Handle updates created by outstanding moves in same update

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If gdk_window_flush_outstanding_moves() creates new update area
we handle this directly in the same draw to avoid flashing.

This mainly affects win32 as X11 does its exposes from moves async.
However, its important for win32 since ScrollDC seems to sometimes
invalidate (and not copy) unexected regions.

http://bugzilla.gnome.org/show_bug.cgi?674051
This commit is contained in:
Alexander Larsson 2013-04-11 12:15:30 +02:00
parent 1884271f03
commit 645f6435e5
1 changed files with 9 additions and 1 deletions
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10
gdk/gdkwindow.c
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@ -4070,6 +4070,7 @@ gdk_window_process_updates_internal (GdkWindow *window)
GdkWindowImplClass *impl_class; GdkWindowImplClass *impl_class;
gboolean save_region = FALSE; gboolean save_region = FALSE;
GdkRectangle clip_box; GdkRectangle clip_box;
int iteration;
/* Ensure the window lives while updating it */ /* Ensure the window lives while updating it */
g_object_ref (window); g_object_ref (window);
@ -4077,8 +4078,15 @@ gdk_window_process_updates_internal (GdkWindow *window)
/* If an update got queued during update processing, we can get a /* If an update got queued during update processing, we can get a
* window in the update queue that has an empty update_area. * window in the update queue that has an empty update_area.
* just ignore it. * just ignore it.
*
* We run this multiple times if needed because on win32 the
* first run can cause new (synchronous) updates from
* gdk_window_flush_outstanding_moves(). However, we
* limit it to two iterations to avoid any potential loops.
*/ */
if (window->update_area) iteration = 0;
while (window->update_area &&
iteration++ < 2)
{ {
cairo_region_t *update_area = window->update_area; cairo_region_t *update_area = window->update_area;
window->update_area = NULL; window->update_area = NULL;