commit 148c1992ac5d8de562b143e46b74f21b563a40ad
author Giulio Camuffo <giuliocamuffo@gmail.com> Sun Sep 04 18:50:46 2016 +0300
committer Quentin Glidic <sardemff7+git@sardemff7.net> Sat Sep 24 11:26:16 2016 +0200
tree 6b61d376f9219c775bd14112c3a6b6f29886fa54
parent 357849799024a463b04dc61d3b5988fd8b01410f

compositor: set the opaque region for some views with transform

If the transform on a view is only a translation we can trivially
set the opaque region for it so to optimize the rendering.
Reviewed-by: Jonas Ådahl <jadahl@gmail.com>

libweston/compositor.c

diff --git a/libweston/compositor.c b/libweston/compositor.c
index 47907bb..8c3872d 100644
--- a/libweston/compositor.c
+++ b/libweston/compositor.c
@@ -1192,6 +1192,15 @@
 		return -1;
 	}
 
+	if (view->alpha == 1.0 &&
+	    matrix->type == WESTON_MATRIX_TRANSFORM_TRANSLATE) {
+		pixman_region32_copy(&view->transform.opaque,
+				     &view->surface->opaque);
+		pixman_region32_translate(&view->transform.opaque,
+					  matrix->d[12],
+					  matrix->d[13]);
+	}
+
 	pixman_region32_init_rect(&surfregion, 0, 0,
 				  view->surface->width, view->surface->height);
 	if (view->geometry.scissor_enabled)