[gtk+] cssimage: Handle 0x0 images

[Benjamin Otte <otte src gnome org>]

commit bf130da741b63c1cdd92969f513aa74258dc3d62
Author: Benjamin Otte <otte redhat com>
Date:   Tue Dec 15 21:23:59 2015 +0100

    cssimage: Handle 0x0 images
    
    0x0 images can happen when we fail to load an image - or when we
    successfully load a 0x0 image.

 gtk/gtkcssimagesurface.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkcssimagesurface.c b/gtk/gtkcssimagesurface.c
index ac812dd..1570e83 100644
--- a/gtk/gtkcssimagesurface.c
+++ b/gtk/gtkcssimagesurface.c
@@ -46,11 +46,18 @@ gtk_css_image_surface_draw (GtkCssImage *image,
                             double       height)
 {
   GtkCssImageSurface *surface = GTK_CSS_IMAGE_SURFACE (image);
+  int image_width, image_height;
+
+  image_width = cairo_image_surface_get_width (surface->surface);
+  image_height = cairo_image_surface_get_height (surface->surface);
+
+  if (image_width == 0 || image_height == 0)
+    return;
 
   cairo_rectangle (cr, 0, 0, width, height);
   cairo_scale (cr,
-               width / cairo_image_surface_get_width (surface->surface),
-               height / cairo_image_surface_get_height (surface->surface));
+               width / image_width,
+               height / image_height);
   cairo_set_source_surface (cr, surface->surface, 0, 0);
   cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
   cairo_fill (cr);