Added BufferedDecompositionGroupPrimitive2D

...and adapted GlowPrimitive2D to it as a preparation to
use similar to BufferedDecompositionPrimitive2D, but for
primitives based on GroupPrimitive2D.

Change-Id: Ia1f9a09d4db09238ebbf6ad1303a4cdbdb8baedf
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/139099
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>

2 files changed, 74 insertions, 18 deletions

diff --git a/include/drawinglayer/primitive2d/BufferedDecompositionGroupPrimitive2D.hxx b/include/drawinglayer/primitive2d/BufferedDecompositionGroupPrimitive2D.hxx
new file mode 100644
index 000000000000..b5446c703d2e
--- /dev/null
+++ b/include/drawinglayer/primitive2d/BufferedDecompositionGroupPrimitive2D.hxx
@@ -0,0 +1,69 @@
+/* -*- 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/primitive2d/groupprimitive2d.hxx>
+
+namespace drawinglayer::primitive2d
+{
+/** BufferedDecompositionGroupPrimitive2D class
+
+    Baseclass for all C++ implementations whiich are derived from GroupPrimitive2D
+    which want to buffer the decomposition result
+
+    For discussion please refer to BufferedDecompositionPrimitive2D, this is the same
+    but for GroupPrimitive2D which want to buffer their decomposition
+ */
+class DRAWINGLAYER_DLLPUBLIC BufferedDecompositionGroupPrimitive2D : public GroupPrimitive2D
+{
+private:
+    /// a sequence used for buffering the last create2DDecomposition() result
+    Primitive2DContainer maBuffered2DDecomposition;
+
+protected:
+    /// identical to BufferedDecompositionPrimitive2D, see there please
+    const Primitive2DContainer& getBuffered2DDecomposition() const
+    {
+        return maBuffered2DDecomposition;
+    }
+    void setBuffered2DDecomposition(Primitive2DContainer&& rNew)
+    {
+        maBuffered2DDecomposition = std::move(rNew);
+    }
+
+    /// method which is to be used to implement the local decomposition of a 2D group primitive.
+    virtual void
+    create2DDecomposition(Primitive2DContainer& rContainer,
+                          const geometry::ViewInformation2D& rViewInformation) const = 0;
+
+public:
+    /// constructor/destructor. For GroupPrimitive2D we need the child parameter, too.
+    BufferedDecompositionGroupPrimitive2D(Primitive2DContainer&& aChildren);
+
+    /// identical to BufferedDecompositionPrimitive2D, see there please
+    virtual void
+    get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor,
+                       const geometry::ViewInformation2D& rViewInformation) const override;
+};
+
+} // end of namespace drawinglayer::primitive2d
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/drawinglayer/primitive2d/glowprimitive2d.hxx b/include/drawinglayer/primitive2d/glowprimitive2d.hxx
index 1fbc5f73652c..6a60c85ad6ae 100644
--- a/include/drawinglayer/primitive2d/glowprimitive2d.hxx
+++ b/include/drawinglayer/primitive2d/glowprimitive2d.hxx
@@ -22,16 +22,14 @@
 #include <drawinglayer/drawinglayerdllapi.h>
 
 #include <drawinglayer/primitive2d/groupprimitive2d.hxx>
+#include <drawinglayer/primitive2d/BufferedDecompositionGroupPrimitive2D.hxx>
 #include <tools/color.hxx>
 
 namespace drawinglayer::primitive2d
 {
-class DRAWINGLAYER_DLLPUBLIC GlowPrimitive2D final : public GroupPrimitive2D
+class DRAWINGLAYER_DLLPUBLIC GlowPrimitive2D final : public BufferedDecompositionGroupPrimitive2D
 {
 private:
-    /// a sequence used for buffering the last create2DDecomposition() result
-    Primitive2DContainer maBuffered2DDecomposition;
-
     /// the Glow color to which all geometry is to be forced; includes alpha
     Color maGlowColor;
 
@@ -49,21 +47,10 @@ private:
                                        const geometry::ViewInformation2D& rViewInformation) const;
 
 protected:
-    /** access methods to maBuffered2DDecomposition, same as in
-     *  BufferedDecompositionPrimitive2D
-     */
-    const Primitive2DContainer& getBuffered2DDecomposition() const
-    {
-        return maBuffered2DDecomposition;
-    }
-    void setBuffered2DDecomposition(Primitive2DContainer&& rNew)
-    {
-        maBuffered2DDecomposition = std::move(rNew);
-    }
-
     /** method which is to be used to implement the local decomposition of a 2D primitive. */
-    virtual void create2DDecomposition(Primitive2DContainer& rContainer,
-                                       const geometry::ViewInformation2D& rViewInformation) const;
+    virtual void
+    create2DDecomposition(Primitive2DContainer& rContainer,
+                          const geometry::ViewInformation2D& rViewInformation) const override;
 
 public:
     /// constructor