Forward port wxGraphicsBitmap cairo implementation, and fix the credit info in measuring.cpp

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61152 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/graphcmn.cpp

@@ -781,20 +781,12 @@ wxGraphicsFont wxGraphicsContext::CreateFont( const wxFont &font , const wxColou
 
 wxGraphicsBitmap wxGraphicsContext::CreateBitmap( const wxBitmap& bmp ) const
 {
-#ifndef __WXGTK20__
     return GetRenderer()->CreateBitmap(bmp);
-#else
-    return wxNullGraphicsBitmap;
-#endif
 }
 
 wxGraphicsBitmap wxGraphicsContext::CreateSubBitmap( const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h   ) const
 {
-#ifndef __WXGTK20__
     return GetRenderer()->CreateSubBitmap(bmp,x,y,w,h);
-#else
-    return wxNullGraphicsBitmap;
-#endif
 }
 
 /* static */ wxGraphicsContext* wxGraphicsContext::Create( const wxWindowDC& dc)