[gtk/wip/chergert/glproto] namespace a bit

[Christian Hergert <chergert src gnome org>]

commit b2784fd3f014b297d11f51e9c8b0aa7b87518fa2
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jan 28 16:18:24 2021 -0800

    namespace a bit

 gsk/next/ninesliceprivate.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gsk/next/ninesliceprivate.h b/gsk/next/ninesliceprivate.h
index 02d250ec4e..86ac1ac91a 100644
--- a/gsk/next/ninesliceprivate.h
+++ b/gsk/next/ninesliceprivate.h
@@ -39,9 +39,9 @@ enum {
 };
 
 static inline bool G_GNUC_PURE
-slice_is_visible (const cairo_rectangle_int_t *r)
+nine_slice_is_visible (const GskGLTextureNineSlice *slice)
 {
-  return (r->width > 0 && r->height > 0);
+  return slice->rect.width > 0 && slice->rect.height > 0;
 }
 
 static inline void