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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 <o3tl/cow_wrapper.hxx>
+#include <basegfx/basegfxdllapi.h>
+
+
+namespace basegfx
+{
+ class B2DRange;
+ class B2DPolyPolygon;
+ class B2DHomMatrix;
+}
+
+namespace basegfx::utils
+{
+ class ImplB2DClipState;
+
+ /** This class provides an optimized, symbolic clip state for graphical output
+
+ Having a current 'clip' state is a common attribute of
+ almost all graphic output APIs, most of which internally
+ represent it via a list of rectangular bands. In contrast,
+ this implementation purely uses symbolic clips, but in a
+ quite efficient manner, deferring actual evaluation until
+ a clip representation is requested, and using faster code
+ paths for common special cases (like all-rectangle clips)
+ */
+ class BASEGFX_DLLPUBLIC B2DClipState
+ {
+ public:
+ typedef o3tl::cow_wrapper< ImplB2DClipState > ImplType;
+
+ private:
+ ImplType mpImpl;
+
+ public:
+ /// Init clip, in 'cleared' state - everything is visible
+ B2DClipState();
+ ~B2DClipState();
+ B2DClipState( const B2DClipState& );
+ B2DClipState( B2DClipState&& );
+ explicit B2DClipState( const B2DPolyPolygon& );
+ B2DClipState& operator=( const B2DClipState& );
+ B2DClipState& operator=( B2DClipState&& );
+
+ /// Set clip to 'null' - nothing is visible
+ void makeNull();
+
+ /// returns true when clip is 'cleared' - everything is visible
+ bool isCleared() const;
+
+ bool operator==(const B2DClipState&) const;
+ bool operator!=(const B2DClipState&) const;
+
+ void unionRange(const B2DRange& );
+ void unionPolyPolygon(const B2DPolyPolygon& );
+
+ void intersectRange(const B2DRange& );
+ void intersectPolyPolygon(const B2DPolyPolygon& );
+
+ void subtractRange(const B2DRange& );
+ void subtractPolyPolygon(const B2DPolyPolygon& );
+
+ void xorRange(const B2DRange& );
+ void xorPolyPolygon(const B2DPolyPolygon& );
+
+ void transform(const B2DHomMatrix& );
+
+ B2DPolyPolygon const & getClipPoly() const;
+ };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */