[gtk] cssimagebuiltin: Don't create cairo nodes for empty icons

[Timm Bäder <baedert src gnome org>]

commit bb56b4ef5d975fff91e7caa39e058d02fd7373bb
Author: Timm Bäder <mail baedert org>
Date:   Tue Oct 15 07:13:28 2019 +0200

    cssimagebuiltin: Don't create cairo nodes for empty icons
    
    GTK_CSS_IMAGE_BUILTIN_NONE is not going to draw anything of course, so
    don't bother creating an empty cairo node for it.

 gtk/gtkcssimagebuiltin.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)
---
diff --git a/gtk/gtkcssimagebuiltin.c b/gtk/gtkcssimagebuiltin.c
index f377e44e89..e005eb6e2a 100644
--- a/gtk/gtkcssimagebuiltin.c
+++ b/gtk/gtkcssimagebuiltin.c
@@ -649,8 +649,6 @@ gtk_css_image_builtin_snapshot (GtkCssImage            *image,
                                 double                  height,
                                 GtkCssImageBuiltinType  image_type)
 {
-  cairo_t *cr;
-
   g_return_if_fail (GTK_IS_CSS_IMAGE (image));
   g_return_if_fail (snapshot != NULL);
   g_return_if_fail (width > 0);
@@ -662,10 +660,11 @@ gtk_css_image_builtin_snapshot (GtkCssImage            *image,
       return;
     }
 
-  cr = gtk_snapshot_append_cairo (snapshot,
-                                  &GRAPHENE_RECT_INIT (0, 0, width, height));
-  gtk_css_image_builtin_draw (image, cr, width, height, image_type);
-  cairo_destroy (cr);
+  if (image_type != GTK_CSS_IMAGE_BUILTIN_NONE)
+    {
+      cairo_t *cr = gtk_snapshot_append_cairo (snapshot,
+                                      &GRAPHENE_RECT_INIT (0, 0, width, height));
+      gtk_css_image_builtin_draw (image, cr, width, height, image_type);
+      cairo_destroy (cr);
+    }
 }
-
-