RE: the BitBlt OR transparent bitmaps

[David Fedor]

>I don't know if the PalmOS supports masking...

It doesn't.  In 3.5 we added support for transparency by letting the
developer declare one of the palette indices to be the "transparent color".
That way we don't use as much memory, though we do lose one potential color
for a bitmap which has transparent areas.

-David Fedor
Palm Developer Support