Why some gdi32 calls aren't caught in relay while some are caught?

[Juan Lang]

> Wine doc says relay supports user32, ntdll, etc, but not gdi32.
> However when I run wine, some gdi32 calls are caught, e.g, CreateBitmap()
> But some aren't caught, e.g, CreateBitmapIndirect()

IIRC, calls across dlls are caught by +relay, but calls within the
same dll are not.
--Juan