include/basegfx/utils/b2dclipstate.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_BASEGFX_UTILS_B2DCLIPSTATE_HXX
  21 #define INCLUDED_BASEGFX_UTILS_B2DCLIPSTATE_HXX
  22
  23 #include <o3tl/cow_wrapper.hxx>
  24 #include <basegfx/basegfxdllapi.h>
  25
  26
  27 namespace basegfx
  28 {
  29     class B2DRange;
  30     class B2DPolyPolygon;
  31     class B2DHomMatrix;
  32
  33     namespace utils
  34     {
  35         class ImplB2DClipState;
  36
  37         /** This class provides an optimized, symbolic clip state for graphical output
  38
  39             Having a current 'clip' state is a common attribute of
  40             almost all graphic output APIs, most of which internally
  41             represent it via a list of rectangular bands. In contrast,
  42             this implementation purely uses symbolic clips, but in a
  43             quite efficient manner, deferring actual evaluation until
  44             a clip representation is requested, and using faster code
  45             paths for common special cases (like all-rectangle clips)
  46          */
  47         class BASEGFX_DLLPUBLIC B2DClipState
  48         {
  49         public:
  50             typedef o3tl::cow_wrapper< ImplB2DClipState > ImplType;
  51
  52         private:
  53             ImplType mpImpl;
  54
  55         public:
  56             /// Init clip, in 'cleared' state - everything is visible
  57             B2DClipState();
  58             ~B2DClipState();
  59             B2DClipState( const B2DClipState& );
  60             B2DClipState( B2DClipState&& );
  61             explicit B2DClipState( const B2DPolyPolygon& );
  62             B2DClipState& operator=( const B2DClipState& );
  63             B2DClipState& operator=( B2DClipState&& );
  64
  65             /// Set clip to 'null' - nothing is visible
  66             void makeNull();
  67
  68             /// returns true when clip is 'cleared' - everything is visible
  69             bool isCleared() const;
  70
  71             bool operator==(const B2DClipState&) const;
  72             bool operator!=(const B2DClipState&) const;
  73
  74             void unionRange(const B2DRange& );
  75             void unionPolyPolygon(const B2DPolyPolygon& );
  76
  77             void intersectRange(const B2DRange& );
  78             void intersectPolyPolygon(const B2DPolyPolygon& );
  79
  80             void subtractRange(const B2DRange& );
  81             void subtractPolyPolygon(const B2DPolyPolygon& );
  82
  83             void xorRange(const B2DRange& );
  84             void xorPolyPolygon(const B2DPolyPolygon& );
  85
  86             void transform(const B2DHomMatrix& );
  87
  88             B2DPolyPolygon const & getClipPoly() const;
  89         };
  90     }
  91 }
  92
  93 #endif // INCLUDED_BASEGFX_UTILS_B2DCLIPSTATE_HXX
  94
  95 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */