If you want ot enable transparency in MIDP in handsets that do not support png transparency via cliping…
how would you do a cliping region by pixel outline that is not performance high in costs?
You don’t :-/
All alternatives are prohibitively expensive.
If a particular platform doesn’t support transparency through the standard png loader, and such a feature is critical for your app; just forget about that platform.
It isn’t worth catering for the lowest common denominator in the mobile market. You will end up getting nothing done :-/