From 76ea76831670188fbe54a2994a58929a12eecab6 Mon Sep 17 00:00:00 2001 From: Alexander Larsson Date: Mon, 5 Dec 2011 11:40:30 +0100 Subject: [PATCH] gdk: Fix alpha window background paintings on non-implicit paints --- gdk/gdkwindow.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c index a3a62669a4..912b9b4e31 100644 --- a/gdk/gdkwindow.c +++ b/gdk/gdkwindow.c @@ -2907,6 +2907,20 @@ gdk_window_begin_paint_region (GdkWindow *window, gdk_window_get_content (window), MAX (clip_box.width, 1), MAX (clip_box.height, 1)); + + /* Normally alpha backgrounded client side windows are composited on the implicit paint + by being drawn in back to front order. However, if implicit paints are not used, for + instance if it was flushed due to a non-double-buffered paint in the middle of the + expose we need to copy in the existing data here. */ + if (!gdk_window_has_impl (window) && window->has_alpha_background) + { + cairo_t *cr = cairo_create (paint->surface); + gdk_cairo_set_source_window (cr, impl_window, + - (window->abs_x + clip_box.x), + - (window->abs_y + clip_box.y)); + cairo_paint (cr); + cairo_destroy (cr); + } } cairo_surface_set_device_offset (paint->surface, -clip_box.x, -clip_box.y);