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-rw-r--r-- | include/basegfx/utils/b2dclipstate.hxx | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/include/basegfx/utils/b2dclipstate.hxx b/include/basegfx/utils/b2dclipstate.hxx new file mode 100644 index 000000000..f4d9d9e7d --- /dev/null +++ b/include/basegfx/utils/b2dclipstate.hxx @@ -0,0 +1,92 @@ +/* -*- 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: */ |