Alan W. Irwin - 2014-01-16

You expressed concern privately that the GDI graphics used by wingcc might not support semi-transparent colours. I have looked further into that.

Please take a look at http://msdn.microsoft.com/en-us/library/dd183458(v=vs.85).aspx. It appears to me they are essentially documenting colour transparency although they are referring to it as colour mixing.

Apparently GDI is quite old/deprecated. If the above idea does not work, another possibility is to move wingcc to GDI+ instead (assuming from the name that move would only be a small amount of work). For the GDI+ case, the colour transparency is documented at http://msdn.microsoft.com/en-us/library/ms533803(v=vs.85).aspx