geom/region: add 'bounds' specialisation for region

CMakeLists.txt

@@ -354,6 +354,7 @@ list (
     geom/ray.hpp
     geom/rect.cpp
     geom/rect.hpp
+    geom/region.cpp
     geom/sample/fwd.hpp
     geom/sample/edge.hpp
     geom/sample/surface.hpp

geom/region.cpp

@@ -0,0 +1,25 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright 2019 Danny Robson <danny@nerdcruft.net>
+ */
+
+#include "ops.hpp"
+
+#include "aabb.hpp"
+#include "../region.hpp"
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Bounds calculation for a region is effectively just a type conversion
+template <>
+cruft::geom::aabb<2,float>
+cruft::geom::bounds (region<2,float> val)
+{
+    return aabb2f {
+        val.base (),
+        val.away ()
+    };
+}