wayland: Make the surface actor set its own state

Since the surface actor knows more about how it draws itself, instead of
pushing texture state (buffer and scale), input region and opaque region
from MetaWaylandSurface after having transformed into what the surface
actor expects, make the surface actor set its own state given what state
the Wayland surface is in.

https://bugzilla.gnome.org/show_bug.cgi?id=744933

1 files changed, 29 insertions, 0 deletions

diff --git a/src/compositor/region-utils.c b/src/compositor/region-utils.c
index a78321d11..1b970ba27 100644
--- a/src/compositor/region-utils.c
+++ b/src/compositor/region-utils.c
@@ -172,6 +172,35 @@ meta_region_iterator_next (MetaRegionIterator *iter)
     }
 }
 
+cairo_region_t *
+meta_region_scale (cairo_region_t *region, int scale)
+{
+  int n_rects, i;
+  cairo_rectangle_int_t *rects;
+  cairo_region_t *scaled_region;
+
+  if (scale == 1)
+    return cairo_region_copy (region);
+
+  n_rects = cairo_region_num_rectangles (region);
+
+  rects = g_malloc (sizeof(cairo_rectangle_int_t) * n_rects);
+  for (i = 0; i < n_rects; i++)
+    {
+      cairo_region_get_rectangle (region, i, &rects[i]);
+      rects[i].x *= scale;
+      rects[i].y *= scale;
+      rects[i].width *= scale;
+      rects[i].height *= scale;
+    }
+
+  scaled_region = cairo_region_create_rectangles (rects, n_rects);
+
+  g_free (rects);
+
+  return scaled_region;
+}
+
 static void
 add_expanded_rect (MetaRegionBuilder  *builder,
                    int                 x,