[gtk+/wip/simple-draw3] GtkPixelCache: Make sure we always copy using SOURCE

[Alexander Larsson <alexl src gnome org>]

commit 770ef2dc83b167adc35aa1d5399692eb34cbc9ee
Author: Alexander Larsson <alexl redhat com>
Date:   Tue Apr 30 16:13:44 2013 +0200

    GtkPixelCache: Make sure we always copy using SOURCE
    
    We were using OVER for the first copy (from source to group surface.

 gtk/gtkpixelcache.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkpixelcache.c b/gtk/gtkpixelcache.c
index 7b0b345..b65f20a 100644
--- a/gtk/gtkpixelcache.c
+++ b/gtk/gtkpixelcache.c
@@ -215,6 +215,7 @@ _gtk_pixel_cache_set_position (GtkPixelCache         *cache,
 
       backing_cr = cairo_create (cache->surface);
       gdk_cairo_region (backing_cr, copy_region);
+      cairo_set_operator (backing_cr, CAIRO_OPERATOR_SOURCE);
       cairo_clip (backing_cr);
       cairo_push_group (backing_cr);
       cairo_set_source_surface (backing_cr, cache->surface,
@@ -222,7 +223,6 @@ _gtk_pixel_cache_set_position (GtkPixelCache         *cache,
                                cache->surface_y - new_surf_y);
       cairo_paint (backing_cr);
       cairo_pop_group_to_source (backing_cr);
-      cairo_set_operator (backing_cr, CAIRO_OPERATOR_SOURCE);
       cairo_paint (backing_cr);
       cairo_destroy (backing_cr);