[gtk+] cssimage: Add a warning for drawing empty images

[Benjamin Otte <otte src gnome org>]

commit 016647edb188386c62d76d2c684a46ad37fa097b
Author: Benjamin Otte <otte redhat com>
Date:   Sat Oct 27 01:31:59 2012 +0200

    cssimage: Add a warning for drawing empty images
    
    width and height of an image must be > 0 for the image to get drawn.
    It's up to the code further up to ensure that this is not happening.

 gtk/gtkcssimage.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcssimage.c b/gtk/gtkcssimage.c
index abe95ae..167af64 100644
--- a/gtk/gtkcssimage.c
+++ b/gtk/gtkcssimage.c
@@ -229,6 +229,8 @@ _gtk_css_image_draw (GtkCssImage        *image,
 
   g_return_if_fail (GTK_IS_CSS_IMAGE (image));
   g_return_if_fail (cr != NULL);
+  g_return_if_fail (width > 0);
+  g_return_if_fail (height > 0);
 
   cairo_save (cr);