1 files changed, 75 insertions, 0 deletions
diff --git a/include/drawinglayer/primitive2d/transformprimitive2d.hxx b/include/drawinglayer/primitive2d/transformprimitive2d.hxx
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+++ b/include/drawinglayer/primitive2d/transformprimitive2d.hxx
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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/groupprimitive2d.hxx>
+#include <basegfx/matrix/b2dhommatrix.hxx>
+
+
+namespace drawinglayer::primitive2d
+{
+        /** TransformPrimitive2D class
+
+            This is one of the basic grouping primitives and it provides
+            embedding a sequence of primitives (a geometry) into a
+            transformation. All renderers have to handle this, usually by
+            building a current transformation stack (linear combination)
+            and applying this to all to-be-rendered geometry. If not handling
+            this, the output will be mostly wrong since this primitive is
+            widely used.
+
+            It does transform by embedding an existing geometry into a
+            transformation as Child-content. This allows re-usage of the
+            refcounted Uno-Api primitives and their existing, buffered
+            decompositions.
+
+            It could e.g. be used to show a single object geometry in 1000
+            different, transformed states without the need to create those
+            thousand primitive contents.
+         */
+        class DRAWINGLAYER_DLLPUBLIC TransformPrimitive2D final : public GroupPrimitive2D
+        {
+        private:
+            // the transformation to apply to the child geometry
+            basegfx::B2DHomMatrix                   maTransformation;
+
+        public:
+            /// constructor
+            TransformPrimitive2D(
+                const basegfx::B2DHomMatrix& rTransformation,
+                Primitive2DContainer&& rChildren);
+
+            /// data read access
+            const basegfx::B2DHomMatrix& getTransformation() const { return maTransformation; }
+
+            /// compare operator
+            virtual bool operator==(const BasePrimitive2D& rPrimitive) const override;
+
+            /// get range
+            virtual basegfx::B2DRange getB2DRange(const geometry::ViewInformation2D& rViewInformation) const override;
+
+            /// provide unique ID
+            virtual sal_uInt32 getPrimitive2DID() const override;
+        };
+} // end of namespace drawinglayer::primitive2d
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */