[gnome-shell] st-shadow: Ceil size before comparing with texture

[Jonas Ådahl <jadahl src gnome org>]

commit 5d4a804c90ef824f7edc76d460cd4dd495b5df15
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Oct 26 11:15:46 2017 +0200

    st-shadow: Ceil size before comparing with texture
    
    A fractional resource scale would mean we never use the fast path for
    creating the shadow, because we'd cast the int to a float before
    comparing, which would never match.
    
    Instead compare the expected texture size with the source texture, to
    actually potentially trigger the fast path.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=765011

 src/st/st-private.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/st/st-private.c b/src/st/st-private.c
index c9bcf4c3a..688b17b78 100644
--- a/src/st/st-private.c
+++ b/src/st/st-private.c
@@ -444,8 +444,8 @@ _st_create_shadow_pipeline_from_actor (StShadow     *shadow_spec,
   if (!clutter_actor_get_resource_scale (actor, &resource_scale))
     return NULL;
 
-  width *= resource_scale;
-  height *= resource_scale;
+  width = ceilf (width * resource_scale);
+  height = ceilf (height * resource_scale);
 
   image = clutter_actor_get_content (actor);
   if (image && CLUTTER_IS_IMAGE (image))