[mutter] MetaCursorRendererNative: Fall back to texture when there is no gbm

[Jonas Ådahl <jadahl src gnome org>]

commit 68d690225a44ff0a593e6decab28360f3bcb3a43
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue Sep 27 13:39:45 2016 +0800

    MetaCursorRendererNative: Fall back to texture when there is no gbm
    
    For when there is no gbm available, for example when using
    EGLDevice/EGLStream's, just fall back to the OpenGL texture based
    cursor rendering path.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=773629

 src/backends/native/meta-cursor-renderer-native.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/src/backends/native/meta-cursor-renderer-native.c 
b/src/backends/native/meta-cursor-renderer-native.c
index 2105d61..e9bbbed 100644
--- a/src/backends/native/meta-cursor-renderer-native.c
+++ b/src/backends/native/meta-cursor-renderer-native.c
@@ -527,6 +527,9 @@ meta_cursor_renderer_native_realize_cursor_from_wl_buffer (MetaCursorRenderer *r
   CoglTexture *texture;
   uint width, height;
 
+  if (!priv->gbm)
+    return;
+
   /* Destroy any previous pending cursor buffer; we'll always either fail (which
    * should unset, or succeed, which will set new buffer.
    */
@@ -614,6 +617,11 @@ meta_cursor_renderer_native_realize_cursor_from_xcursor (MetaCursorRenderer *ren
                                                          XcursorImage *xc_image)
 {
   MetaCursorRendererNative *native = META_CURSOR_RENDERER_NATIVE (renderer);
+  MetaCursorRendererNativePrivate *priv =
+         meta_cursor_renderer_native_get_instance_private (native);
+
+  if (!priv->gbm)
+    return;
 
   invalidate_pending_cursor_sprite_gbm_bo (cursor_sprite);