From c5dc0f4a2eaf5214406eb647b80898c6eba7c719 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20=C3=85dahl?= <jadahl@gmail.com>
Date: Tue, 7 Mar 2017 18:02:52 +0800
Subject: [PATCH] clutter/stage-view: Add getter for getting the offscreen blit
 transform

This will be used to invert the transform in the nested mode, making it
possible to test offscreen texture based transform using the nested
backend.

https://bugzilla.gnome.org/show_bug.cgi?id=779745
---
 clutter/clutter/clutter-stage-view.c | 12 ++++++++++--
 clutter/clutter/clutter-stage-view.h |  4 ++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/clutter/clutter/clutter-stage-view.c b/clutter/clutter/clutter-stage-view.c
index 2b89bb273..e39927884 100644
--- a/clutter/clutter/clutter-stage-view.c
+++ b/clutter/clutter/clutter-stage-view.c
@@ -179,16 +179,24 @@ clutter_stage_view_set_dirty_projection (ClutterStageView *view,
   priv->dirty_projection = dirty;
 }
 
+void
+clutter_stage_view_get_offscreen_transformation_matrix (ClutterStageView *view,
+                                                        CoglMatrix       *matrix)
+{
+  ClutterStageViewClass *view_class = CLUTTER_STAGE_VIEW_GET_CLASS (view);
+
+  view_class->get_offscreen_transformation_matrix (view, matrix);
+}
+
 void
 clutter_stage_view_transform_to_onscreen (ClutterStageView *view,
                                           gfloat           *x,
                                           gfloat           *y)
 {
-  ClutterStageViewClass *view_class = CLUTTER_STAGE_VIEW_GET_CLASS (view);
   gfloat z = 0, w = 1;
   CoglMatrix matrix;
 
-  view_class->get_offscreen_transformation_matrix (view, &matrix);
+  clutter_stage_view_get_offscreen_transformation_matrix (view, &matrix);
   cogl_matrix_get_inverse (&matrix, &matrix);
   cogl_matrix_transform_point (&matrix, x, y, &z, &w);
 }
diff --git a/clutter/clutter/clutter-stage-view.h b/clutter/clutter/clutter-stage-view.h
index e820e9646..3eb8da452 100644
--- a/clutter/clutter/clutter-stage-view.h
+++ b/clutter/clutter/clutter-stage-view.h
@@ -70,4 +70,8 @@ gboolean clutter_stage_view_is_dirty_projection (ClutterStageView *view);
 void clutter_stage_view_set_dirty_projection (ClutterStageView *view,
                                               gboolean          dirty);
 
+CLUTTER_AVAILABLE_IN_MUTTER
+void clutter_stage_view_get_offscreen_transformation_matrix (ClutterStageView *view,
+                                                             CoglMatrix       *matrix);
+
 #endif /* __CLUTTER_STAGE_VIEW_H__ */