diff --git a/libweston/compositor.c b/libweston/compositor.c
index 69d101c0..6fbe3c62 100644
--- a/libweston/compositor.c
+++ b/libweston/compositor.c
@@ -810,6 +810,16 @@ weston_surface_to_buffer_region(struct weston_surface *surface,
 	free(dest_rects);
 }
 
+WL_EXPORT void
+weston_view_buffer_to_output_matrix(const struct weston_view *view,
+				    const struct weston_output *output,
+				    struct weston_matrix *matrix)
+{
+	*matrix = view->surface->buffer_to_surface_matrix;
+	weston_matrix_multiply(matrix, &view->transform.matrix);
+	weston_matrix_multiply(matrix, &output->matrix);
+}
+
 WL_EXPORT void
 weston_view_move_to_plane(struct weston_view *view,
 			     struct weston_plane *plane)
diff --git a/libweston/libweston-internal.h b/libweston/libweston-internal.h
index b47e918c..c0bb2d77 100644
--- a/libweston/libweston-internal.h
+++ b/libweston/libweston-internal.h
@@ -367,6 +367,10 @@ weston_view_takes_input_at_point(struct weston_view *view, int x, int y);
 void
 weston_view_move_to_plane(struct weston_view *view,
 			  struct weston_plane *plane);
+void
+weston_view_buffer_to_output_matrix(const struct weston_view *view,
+				    const struct weston_output *output,
+				    struct weston_matrix *matrix);
 
 pixman_box32_t
 weston_matrix_transform_rect(struct weston_matrix *matrix,