[clutter] cairo-texture: Skip ::draw emission for 0x0 surfaces

[Emmanuele Bassi <ebassi src gnome org>]

commit 90f37d5636f5a1cec3e8423625647f774af7141f
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Nov 18 17:22:12 2011 +0000

    cairo-texture: Skip ::draw emission for 0x0 surfaces
    
    This also avoids an assertion failure.

 clutter/clutter-cairo-texture.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/clutter/clutter-cairo-texture.c b/clutter/clutter-cairo-texture.c
index 199f212..c8f165a 100644
--- a/clutter/clutter-cairo-texture.c
+++ b/clutter/clutter-cairo-texture.c
@@ -330,6 +330,12 @@ clutter_cairo_texture_emit_draw (ClutterCairoTexture        *self,
   gboolean result;
   cairo_t *cr;
 
+  /* 0x0 surfaces don't need a ::draw */
+  if (self->priv->surface_width == 0 ||
+      self->priv->surface_height == 0)
+    return;
+
+  /* if the size is !0 then we must have a surface */
   g_assert (self->priv->cr_surface != NULL);
 
   cr = cairo_create (self->priv->cr_surface);