include/basegfx/tools/b2dclipstate.hxx

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  19
  20 #ifndef INCLUDED_BASEGFX_TOOLS_B2DCLIPSTATE_HXX
  21 #define INCLUDED_BASEGFX_TOOLS_B2DCLIPSTATE_HXX
  22
  23 #include <sal/types.h>
  24 #include <o3tl/cow_wrapper.hxx>
  25 #include <basegfx/basegfxdllapi.h>
  26
  27
  28 namespace basegfx
  29 {
  30     class B2DRange;
  31     class B2DPolyRange;
  32     class B2DPolygon;
  33     class B2DPolyPolygon;
  34
  35     namespace tools
  36     {
  37         class ImplB2DClipState;
  38
  39         /** This class provides an optimized, symbolic clip state for graphical output
  40
  41             Having a current 'clip' state is a common attribute of
  42             almost all graphic output APIs, most of which internally
  43             represent it via a list of rectangular bands. In contrast,
  44             this implementation purely uses symbolic clips, but in a
  45             quite efficient manner, deferring actual evaluation until
  46             a clip representation is requested, and using faster code
  47             paths for common special cases (like all-rectangle clips)
  48          */
  49         class BASEGFX_DLLPUBLIC B2DClipState
  50         {
  51         public:
  52             typedef o3tl::cow_wrapper< ImplB2DClipState > ImplType;
  53
  54         private:
  55             ImplType mpImpl;
  56
  57         public:
  58             /// Init clip, in 'cleared' state - everything is visible
  59             B2DClipState();
  60             ~B2DClipState();
  61             B2DClipState( const B2DClipState& );
  62             explicit B2DClipState( const B2DPolyPolygon& );
  63             B2DClipState& operator=( const 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             B2DPolyPolygon getClipPoly() const;
  87         };
  88     }
  89 }
  90
  91 #endif // INCLUDED_BASEGFX_TOOLS_B2DCLIPSTATE_HXX
  92
  93 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */