cssimage: Make cross-fades cross-fade properly

We need to use OPERATOR_SOURCE to properly fade out the start image
when the end image contains transparency.

diff --git a/gtk/gtkcssimagecrossfade.c b/gtk/gtkcssimagecrossfade.c
index f7f8a6312a63d6f5ee9fd10ef87f96ee7911d724..424703af85e7178dd280aeaa0368b583bb7eac52 100644 (file)
--- a/gtk/gtkcssimagecrossfade.c
+++ b/gtk/gtkcssimagecrossfade.c
@@ -121,6 +121,7 @@ gtk_css_image_cross_fade_draw (GtkCssImage        *image,
                                                 cairo_get_target (cr),
                                                 width, height);
           cairo_set_source_surface (cr, surface, 0, 0);
+          cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
           cairo_paint_with_alpha (cr, cross_fade->progress);
           cairo_surface_destroy (surface);