Add gtk_snapshot_push_cross_fade()

... and use it.

The function is a bit awkward because it requires 2 calls to
gtk_snapshot_pop(), but once you accept that, it's very convenient to
use, as can be seen by the 2 implementations.

1 files changed, 4 insertions, 0 deletions

diff --git a/gtk/gtksnapshotprivate.h b/gtk/gtksnapshotprivate.h
index 91d1b66ef6..3989bc5fde 100644
--- a/gtk/gtksnapshotprivate.h
+++ b/gtk/gtksnapshotprivate.h
@@ -67,6 +67,10 @@ struct _GtkSnapshotState {
       GskShadow *shadows;
       GskShadow a_shadow; /* Used if n_shadows == 1 */
     } shadow;
+    struct {
+      double progress;
+      GskRenderNode *start_node;
+    } cross_fade;
   } data;
 };