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+/* -*- 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/baseprimitive2d.hxx>
+
+
+// GroupPrimitive2D class
+
+namespace drawinglayer::primitive2d
+{
+ /** GroupPrimitive2D class
+
+ Baseclass for all grouping 2D primitives
+
+ The grouping primitive in its basic form is capable of holding
+ a child primitive content and returns it on decomposition on default.
+ It is used for two main purposes, but more may apply:
+
+ - to transport extended information, e.g. for text classification,
+ see e.g. TextHierarchy*Primitive2D implementations. Since they
+ decompose to their child content, renderers not aware/interested
+ in that extra information will just ignore these primitives
+
+ - to encapsulate common geometry, e.g. the ShadowPrimitive2D implements
+ applying a generic shadow to a child sequence by adding the needed
+ offset and color stuff in the decomposition
+
+ In most cases the decomposition is straightforward, so by default
+ this primitive will not buffer the result and is not derived from
+ BufferedDecompositionPrimitive2D, but from BasePrimitive2D.
+
+ A renderer has to take GroupPrimitive2D derivations into account which
+ are used to hold a state.
+
+ Current Basic 2D StatePrimitives are:
+
+ - TransparencePrimitive2D (objects with freely defined transparence)
+ - InvertPrimitive2D (for XOR)
+ - MaskPrimitive2D (for masking)
+ - ModifiedColorPrimitive2D (for a stack of color modifications)
+ - TransformPrimitive2D (for a transformation stack)
+ */
+ class DRAWINGLAYER_DLLPUBLIC GroupPrimitive2D : public BasePrimitive2D
+ {
+ private:
+ /// the children. Declared private since this shall never be changed at all after construction
+ Primitive2DContainer maChildren;
+
+ public:
+ /// constructor
+ explicit GroupPrimitive2D(const Primitive2DContainer& rChildren);
+
+ /// data read access
+ const Primitive2DContainer& getChildren() const { return maChildren; }
+
+ void getChildren(Primitive2DDecompositionVisitor& rVisitor) const { rVisitor.append(maChildren); }
+
+ /// compare operator
+ virtual bool operator==( const BasePrimitive2D& rPrimitive ) const override;
+
+ /// local decomposition. Implementation will just return children
+ virtual void get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor, const geometry::ViewInformation2D& rViewInformation) const override;
+
+ /// provide unique ID
+ virtual sal_uInt32 getPrimitive2DID() const override;
+
+ // XAccounting
+ virtual sal_Int64 SAL_CALL estimateUsage() override;
+ };
+} // end of namespace drawinglayer::primitive2d
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */