[clutter] texture: Add some safeguards for paint volumes of empty textures

[Emmanuele Bassi <ebassi src gnome org>]

commit 7e6bf1612b686f42ec82666ddb91b2d6ca7dbb0c
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Fri Apr 1 11:42:41 2011 +0100

    texture: Add some safeguards for paint volumes of empty textures
    
    If the Texture has no material, and the image size is 0x0 then the actor
    doesn't have any paint volume.

 clutter/clutter-texture.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/clutter/clutter-texture.c b/clutter/clutter-texture.c
index 38af6f7..ae4aa13 100644
--- a/clutter/clutter-texture.c
+++ b/clutter/clutter-texture.c
@@ -689,6 +689,16 @@ static gboolean
 clutter_texture_get_paint_volume (ClutterActor       *self,
                                   ClutterPaintVolume *volume)
 {
+  ClutterTexturePrivate *priv;
+
+  priv = CLUTTER_TEXTURE (self)->priv;
+
+  if (priv->material == NULL)
+    return FALSE;
+
+  if (priv->image_width == 0 || priv->image_height == 0)
+    return FALSE;
+
   return _clutter_actor_set_default_paint_volume (self,
                                                   CLUTTER_TYPE_TEXTURE,
                                                   volume);