1 files changed, 61 insertions, 0 deletions
diff --git a/drawinglayer/inc/primitive3d/hiddengeometryprimitive3d.hxx b/drawinglayer/inc/primitive3d/hiddengeometryprimitive3d.hxx
new file mode 100644
index 000000000..246abe38a
--- /dev/null
+++ b/drawinglayer/inc/primitive3d/hiddengeometryprimitive3d.hxx
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <drawinglayer/drawinglayerdllapi.h>
+
+#include <drawinglayer/primitive3d/groupprimitive3d.hxx>
+
+
+namespace drawinglayer
+{
+    namespace primitive3d
+    {
+        // This primitive is used to represent geometry for non-visible objects,
+        // e.g. a 3D cube without fill attributes. To still be able to use
+        // primitives for HitTest functionality, the 3d decompositions produce
+        // an as much as possible simplified fill geometry encapsulated in this
+        // primitive when there is no fill geometry. Currently, the 3d hit test
+        // uses only areas, so maybe in a further enhanced version this will change
+        // to 'if neither filled nor lines' creation criteria. The whole primitive
+        // decomposes to nothing, so no one not knowing it will be influenced. Only
+        // helper processors for hit test (and maybe BoundRect extractors) will
+        // use it and its children subcontent.
+        class HiddenGeometryPrimitive3D final : public GroupPrimitive3D
+        {
+        public:
+            explicit HiddenGeometryPrimitive3D(const Primitive3DContainer& rChildren);
+
+            // despite returning an empty decomposition since it's no visualisation data,
+            // range calculation is intended to use hidden geometry, so
+            // the local implementation will return the children's range
+            virtual basegfx::B3DRange getB3DRange(const geometry::ViewInformation3D& rViewInformation) const override;
+
+            /// The default implementation returns an empty sequence
+            virtual Primitive3DContainer get3DDecomposition(const geometry::ViewInformation3D& rViewInformation) const override;
+
+            // provide unique ID
+            DeclPrimitive3DIDBlock()
+        };
+    } // end of namespace primitive3d
+} // end of namespace drawinglayer
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */