#include "wx/geometry.h"
#include "wx/dynarray.h"
+#include "wx/dc.h"
+
+enum wxAntialiasMode
+{
+ wxANTIALIAS_NONE, // should be 0
+ wxANTIALIAS_DEFAULT,
+};
+
+enum wxCompositionMode
+{
+ // R = Result, S = Source, D = Destination, premultiplied with alpha
+ // Ra, Sa, Da their alpha components
+
+ // classic Porter-Duff compositions
+ // http://keithp.com/~keithp/porterduff/p253-porter.pdf
+
+ wxCOMPOSITION_CLEAR, /* R = 0 */
+ wxCOMPOSITION_SOURCE, /* R = S */
+ wxCOMPOSITION_OVER, /* R = S + D*(1 - Sa) */
+ wxCOMPOSITION_IN, /* R = S*Da */
+ wxCOMPOSITION_OUT, /* R = S*(1 - Da) */
+ wxCOMPOSITION_ATOP, /* R = S*Da + D*(1 - Sa) */
+
+ wxCOMPOSITION_DEST, /* R = D, essentially a noop */
+ wxCOMPOSITION_DEST_OVER, /* R = S*(1 - Da) + D */
+ wxCOMPOSITION_DEST_IN, /* R = D*Sa */
+ wxCOMPOSITION_DEST_OUT, /* R = D*(1 - Sa) */
+ wxCOMPOSITION_DEST_ATOP, /* R = S*(1 - Da) + D*Sa */
+ wxCOMPOSITION_XOR, /* R = S*(1 - Da) + D*(1 - Sa) */
+
+ // mathematical compositions
+ wxCOMPOSITION_ADD, /* R = S + D */
+};
class WXDLLIMPEXP_FWD_CORE wxWindowDC;
class WXDLLIMPEXP_FWD_CORE wxMemoryDC;
// returns the native context
virtual void * GetNativeContext() = 0;
- // returns the current logical function
- virtual wxRasterOperationMode GetLogicalFunction() const { return m_logicalFunction; }
+ // returns the current shape antialiasing mode
+ virtual wxAntialiasMode GetAntialiasMode() const { return m_antialias; }
+
+ // sets the antialiasing mode, returns true if it supported
+ virtual bool SetAntialiasMode(wxAntialiasMode antialias) = 0;
- // sets the current logical function, returns true if it supported
- virtual bool SetLogicalFunction(wxRasterOperationMode function);
+ // returns the current compositing operator
+ virtual wxCompositionMode GetCompositionMode() const { return m_composition; }
+
+ // sets the compositing operator, returns true if it supported
+ virtual bool SetCompositionMode(wxCompositionMode op) = 0;
// returns the size of the graphics context in device coordinates
virtual void GetSize( wxDouble* width, wxDouble* height);
// returns the alpha on this context
virtual wxDouble GetAlpha() const;
#endif
+
+ // all rendering is done into a fully transparent temporary context
+ virtual void BeginLayer(wxDouble opacity) = 0;
+
+ // composites back the drawings into the context with the opacity given at
+ // the BeginLayer call
+ virtual void EndLayer() = 0;
+
//
// transformation : changes the current transformation matrix CTM of the context
//
// draws a polygon
virtual void DrawLines( size_t n, const wxPoint2DDouble *points, wxPolygonFillMode fillStyle = wxODDEVEN_RULE );
- // draws a polygon
+ // draws a rectangle
virtual void DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h);
// draws an ellipse
wxGraphicsPen m_pen;
wxGraphicsBrush m_brush;
wxGraphicsFont m_font;
- wxRasterOperationMode m_logicalFunction;
+ wxAntialiasMode m_antialias;
+ wxCompositionMode m_composition;
-private:
+protected:
// implementations of overloaded public functions: we use different names
// for them to avoid the virtual function hiding problems in the derived
// classes
wxDouble angle,
const wxGraphicsBrush& backgroundBrush);
- DECLARE_NO_COPY_CLASS(wxGraphicsContext)
+ wxDECLARE_NO_COPY_CLASS(wxGraphicsContext);
DECLARE_ABSTRACT_CLASS(wxGraphicsContext)
};
private:
- DECLARE_NO_COPY_CLASS(wxGraphicsRenderer)
+ wxDECLARE_NO_COPY_CLASS(wxGraphicsRenderer);
DECLARE_ABSTRACT_CLASS(wxGraphicsRenderer)
};