fixing test, adding minimal docs

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67910 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/graphics.h

@@ -508,10 +508,10 @@ public:
     // sets the antialiasing mode, returns true if it supported
     virtual bool SetAntialiasMode(wxAntialiasMode antialias) = 0;
 
-    // returns the current interpolation mode
+    // returns the current interpolation quality
     virtual wxInterpolationQuality GetInterpolationQuality() const { return m_interpolation; }
     
-    // sets the interpolation mode, returns true if it supported
+    // sets the interpolation quality, returns true if it supported
     virtual bool SetInterpolationQuality(wxInterpolationQuality interpolation) = 0;
     
     // returns the current compositing operator

interface/wx/graphics.h

@@ -212,6 +212,21 @@ enum wxAntialiasMode
     wxANTIALIAS_DEFAULT,
 };
 
+/**
+    Interpolation quality used by wxGraphicsContext::SetInterpolationQuality().
+ */
+enum wxInterpolationQuality
+{
+    /** no interpolation */
+    wxINTERPOLATION_NONE, 
+    /** fast interpolation, suited for interactivity */
+    wxINTERPOLATION_FAST,
+    /** better quality */
+    wxINTERPOLATION_GOOD,
+    /** best quality, not suited for interactivity */
+    wxINTERPOLATION_BEST
+};
+
 /**
     Compositing is done using Porter-Duff compositions
     (see http://keithp.com/~keithp/porterduff/p253-porter.pdf) with
@@ -658,6 +673,16 @@ public:
     */
     virtual wxAntialiasMode GetAntialiasMode() const ;
 
+    /**
+        Sets the interpolation quality, returns true if it supported
+     */
+    virtual bool SetInterpolationQuality(wxInterpolationQuality interpolation) = 0;
+    
+    /**
+        Returns the current interpolation quality
+     */
+    virtual wxInterpolationQuality GetInterpolationQuality() const;
+    
     /**
         Sets the compositing operator, returns true if it supported
     */