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Avoid unnecessary window flushes

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The code was calling _gdk_window_ref_cairo_surface in a few places
where the intent was not to read/write to the surface, but just look
at its type (to e.g. create a similar surface). This is bad, as that
operation causes a flush which may cause unnecessary work and/or
flashing. Instead we just get the impl surface in these cases.
This commit is contained in:
Alexander Larsson 2012-08-22 17:01:15 +02:00
parent 8946cd70e1
commit 04811d9483
1 changed files with 3 additions and 2 deletions
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5
gdk/gdkwindow.c
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@ -254,6 +254,7 @@ static void gdk_window_invalidate_rect_full (GdkWindow *window,
gboolean invalidate_children,
ClearBg clear_bg);
static void _gdk_window_propagate_has_alpha_background (GdkWindow *window);
static cairo_surface_t *gdk_window_ref_impl_surface (GdkWindow *window);
static guint signals[LAST_SIGNAL] = { 0 };
@ -2671,7 +2672,7 @@ gdk_window_get_content (GdkWindow *window)
g_return_val_if_fail (GDK_IS_WINDOW (window), 0);
surface = _gdk_window_ref_cairo_surface (window);
surface = gdk_window_ref_impl_surface (window);
content = cairo_surface_get_content (surface);
cairo_surface_destroy (surface);
@ -10129,7 +10130,7 @@ gdk_window_create_similar_surface (GdkWindow * window,
g_return_val_if_fail (GDK_IS_WINDOW (window), NULL);
window_surface = _gdk_window_ref_cairo_surface (window);
window_surface = gdk_window_ref_impl_surface (window);
switch (_gdk_rendering_mode)
{