Define wxGraphicsRenderer::GetDefaultRenderer() for all non-{MSW,Mac} ports.

wxGraphicsRenderer::GetDefaultRenderer() was only defined for wxGTK for some
reason but it needs to be defined in terms of GetCairoRenderer() for all ports
without native renderer implementation, i.e. everything but wxMSW and wxMac.

See #11817.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63715 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/graphicc.cpp

@@ -1771,13 +1771,6 @@ static wxCairoRenderer gs_cairoGraphicsRenderer;
 extern wxGraphicsRenderer* gCairoRenderer;
 wxGraphicsRenderer* gCairoRenderer = &gs_cairoGraphicsRenderer;
 
-#ifdef __WXGTK__
-wxGraphicsRenderer* wxGraphicsRenderer::GetDefaultRenderer()
-{
-    return &gs_cairoGraphicsRenderer;
-}
-#endif
-
 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxWindowDC& dc)
 {
     return new wxCairoContext(this,dc);
@@ -1952,15 +1945,27 @@ wxCairoRenderer::CreateSubBitmap(const wxGraphicsBitmap& WXUNUSED(bitmap),
     return wxNullGraphicsBitmap;
 }
 
-#endif  // wxUSE_CAIRO
+wxGraphicsRenderer* wxGraphicsRenderer::GetCairoRenderer()
+{
+    return &gs_cairoGraphicsRenderer;
+}
+
+#else // !wxUSE_CAIRO
 
 wxGraphicsRenderer* wxGraphicsRenderer::GetCairoRenderer()
 {
-#if wxUSE_CAIRO
-    return &gs_cairoGraphicsRenderer;
-#else
     return NULL;
-#endif
 }
 
+#endif  // wxUSE_CAIRO/!wxUSE_CAIRO
+
+// MSW and OS X have their own native default renderers, but the other ports
+// use Cairo by default
+#if !(defined(__WXMSW__) || defined(__WXOSX__))
+wxGraphicsRenderer* wxGraphicsRenderer::GetDefaultRenderer()
+{
+    return GetCairoRenderer();
+}
+#endif // !(__WXMSW__ || __WXOSX__)
+
 #endif // wxUSE_GRAPHICS_CONTEXT