[gtk+] dnd: Fix gtk_drag_set_icon_surface() with translucent surfaces

[Benjamin Otte <otte src gnome org>]

commit f64e2df911eb547c155da488d48ec5bf89ab6b44
Author: Benjamin Otte <otte redhat com>
Date:   Thu Sep 30 16:25:11 2010 +0200

    dnd: Fix gtk_drag_set_icon_surface() with translucent surfaces
    
    The code for surfaces with alpha content was apparently untested and
    screwed up the signs.

 gtk/gtkdnd.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkdnd.c b/gtk/gtkdnd.c
index c7f470c..917521a 100644
--- a/gtk/gtkdnd.c
+++ b/gtk/gtkdnd.c
@@ -3290,6 +3290,8 @@ gtk_drag_set_icon_surface (GdkDragContext    *context,
       cairo_t *cr;
 
       region = gdk_cairo_region_create_from_surface (surface);
+      cairo_region_translate (region, -extents.x, -extents.y);
+
       gtk_widget_shape_combine_region (window, region);
       cairo_region_destroy (region);
 
@@ -3302,7 +3304,7 @@ gtk_drag_set_icon_surface (GdkDragContext    *context,
       
       cr = cairo_create (saturated);
       cairo_push_group_with_content (cr, CAIRO_CONTENT_COLOR_ALPHA);
-      cairo_set_source_surface (cr, surface, extents.x, extents.y);
+      cairo_set_source_surface (cr, surface, -extents.x, -extents.y);
       cairo_paint (cr);
       cairo_set_operator (cr, CAIRO_OPERATOR_SATURATE);
       cairo_paint (cr);