adding placeholders for interpolation setting

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67909 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/graphics.h

@@ -27,6 +27,18 @@ enum wxAntialiasMode
     wxANTIALIAS_DEFAULT,
 };
 
+enum wxInterpolationQuality
+{
+    // no interpolation
+    wxINTERPOLATION_NONE, // should be 0
+    // fast interpolation, suited for interactivity
+    wxINTERPOLATION_FAST,
+    // better quality
+    wxINTERPOLATION_GOOD,
+    // best quality, not suited for interactivity
+    wxINTERPOLATION_BEST
+};
+
 enum wxCompositionMode
 {
     // R = Result, S = Source, D = Destination, premultiplied with alpha
@@ -496,6 +508,12 @@ public:
     // sets the antialiasing mode, returns true if it supported
     virtual bool SetAntialiasMode(wxAntialiasMode antialias) = 0;
 
+    // returns the current interpolation mode
+    virtual wxInterpolationQuality GetInterpolationQuality() const { return m_interpolation; }
+    
+    // sets the interpolation mode, returns true if it supported
+    virtual bool SetInterpolationQuality(wxInterpolationQuality interpolation) = 0;
+    
     // returns the current compositing operator
     virtual wxCompositionMode GetCompositionMode() const { return m_composition; }
 
@@ -660,6 +678,7 @@ protected:
     wxGraphicsFont m_font;
     wxAntialiasMode m_antialias;
     wxCompositionMode m_composition;
+    wxInterpolationQuality m_interpolation;
     bool m_enableOffset;
 
 protected: