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:

src/generic/graphicc.cpp

@@ -368,6 +368,8 @@ public:
 
     virtual bool SetAntialiasMode(wxAntialiasMode antialias);
 
+    virtual bool SetInterpolationQuality(wxInterpolationQuality interpolation);
+
     virtual bool SetCompositionMode(wxCompositionMode op);
 
     virtual void BeginLayer(wxDouble opacity);
@@ -1694,6 +1696,12 @@ bool wxCairoContext::SetAntialiasMode(wxAntialiasMode antialias)
     return true;
 }
 
+bool wxCairoContext::SetInterpolationQuality(wxInterpolationQuality WXUNUSED(interpolation))
+{
+    // placeholder
+    return false;
+}
+
 bool wxCairoContext::SetCompositionMode(wxCompositionMode op)
 {
     if ( m_composition == op )

src/msw/graphics.cpp

@@ -335,6 +335,8 @@ public:
 
     virtual bool SetAntialiasMode(wxAntialiasMode antialias);
 
+    virtual bool SetInterpolationQuality(wxInterpolationQuality interpolation);
+    
     virtual bool SetCompositionMode(wxCompositionMode op);
 
     virtual void BeginLayer(wxDouble opacity);
@@ -1479,6 +1481,12 @@ bool wxGDIPlusContext::SetAntialiasMode(wxAntialiasMode antialias)
     return true;
 }
 
+bool wxGDIPlusContext::SetInterpolationQuality(wxInterpolationQuality WXUNUSED(interpolation))
+{
+    // placeholder
+    return false;
+}
+
 bool wxGDIPlusContext::SetCompositionMode(wxCompositionMode op)
 {
     if ( m_composition == op )

src/osx/carbon/graphics.cpp

@@ -1415,6 +1415,8 @@ public:
 
     virtual bool SetAntialiasMode(wxAntialiasMode antialias);
 
+    virtual bool SetInterpolationQuality(wxInterpolationQuality interpolation);
+    
     virtual bool SetCompositionMode(wxCompositionMode op);
 
     virtual void BeginLayer(wxDouble opacity);
@@ -1777,6 +1779,12 @@ bool wxMacCoreGraphicsContext::SetAntialiasMode(wxAntialiasMode antialias)
     return true;
 }
 
+bool wxMacCoreGraphicsContext::SetInterpolationQuality(wxInterpolationQuality WXUNUSED(interpolation))
+{
+    // placeholder
+    return false;
+}
+
 bool wxMacCoreGraphicsContext::SetCompositionMode(wxCompositionMode op)
 {
     if (!EnsureIsValid())