Improvements for building minimal builds and new ports: wxUSE_* usage and minor cleaning.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39633 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/univ/ctrlrend.cpp

@@ -127,6 +127,8 @@ void wxRenderer::StandardDrawTextLine(wxDC& dc,
 // wxRenderer: scrollbar geometry
 // ----------------------------------------------------------------------------
 
+#if wxUSE_SCROLLBAR
+
 /* static */
 void wxRenderer::StandardScrollBarThumbSize(wxCoord length,
                                             int thumbPos,
@@ -386,6 +388,8 @@ wxHitTest wxRenderer::StandardHitTestScrollbar(const wxScrollBar *scrollbar,
     }
 }
 
+#endif // wxUSE_SCROLLBAR
+
 wxRenderer::~wxRenderer()
 {
 }
@@ -500,11 +504,13 @@ void wxControlRenderer::DrawBitmap(wxDC &dc,
             }
         }
     }
+#if wxUSE_IMAGE
     else if ( stretch & wxEXPAND )
     {
         // stretch bitmap to fill the entire control
         bmp = wxBitmap(wxImage(bmp.ConvertToImage()).Scale(rect.width, rect.height));
     }
+#endif // wxUSE_IMAGE
     else // not stretched, not tiled
     {
         if ( alignment & wxALIGN_RIGHT )
@@ -538,6 +544,8 @@ void wxControlRenderer::DrawBitmap(wxDC &dc,
     dc.DrawBitmap(bmp, x, y, true /* use mask */);
 }
 
+#if wxUSE_SCROLLBAR
+
 void wxControlRenderer::DrawScrollbar(const wxScrollBar *scrollbar,
                                       int WXUNUSED(thumbPosOld))
 {
@@ -648,6 +656,8 @@ void wxControlRenderer::DrawScrollbar(const wxScrollBar *scrollbar,
     }
 }
 
+#endif // wxUSE_SCROLLBAR
+
 void wxControlRenderer::DrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 {
     wxASSERT_MSG( x1 == x2 || y1 == y2,