[gtk/wip/baedert/radial-gradient] rendernodes: Enfore end > start for radial gradient nodes

[Timm Bäder <baedert src gnome org>]

commit 5d5fbc69a4931e9760f75f7e6f43a55125eb7188
Author: Timm Bäder <mail baedert org>
Date:   Fri Sep 18 18:29:08 2020 +0200

    rendernodes: Enfore end > start for radial gradient nodes

 gsk/gskrendernodeimpl.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gsk/gskrendernodeimpl.c b/gsk/gskrendernodeimpl.c
index efb49738b9..45734b5599 100644
--- a/gsk/gskrendernodeimpl.c
+++ b/gsk/gskrendernodeimpl.c
@@ -510,6 +510,7 @@ gsk_radial_gradient_node_new (const graphene_rect_t  *bounds,
   g_return_val_if_fail (vradius > 0., NULL);
   g_return_val_if_fail (start >= 0., NULL);
   g_return_val_if_fail (end >= 0., NULL);
+  g_return_val_if_fail (end > start, NULL);
   g_return_val_if_fail (color_stops != NULL, NULL);
   g_return_val_if_fail (n_color_stops >= 2, NULL);
   g_return_val_if_fail (color_stops[0].offset >= 0, NULL);
@@ -555,6 +556,7 @@ gsk_repeating_radial_gradient_node_new (const graphene_rect_t  *bounds,
   g_return_val_if_fail (vradius > 0., NULL);
   g_return_val_if_fail (start >= 0., NULL);
   g_return_val_if_fail (end >= 0., NULL);
+  g_return_val_if_fail (end > start, NULL);
   g_return_val_if_fail (color_stops != NULL, NULL);
   g_return_val_if_fail (n_color_stops >= 2, NULL);
   g_return_val_if_fail (color_stops[0].offset >= 0, NULL);