franco@bbn.com (Frank A. Lonigro) (12/10/88)
I'm having a heck of a time getting offscreen bitmaps to work. I've tried defining a window with portRect, portBits.bounds and visRgn.bounds to be (-512, -342, 0, 0), but when I CopyBits stuff to it and then back to the screen, I get garbage. What am I doing wrong? How do you define and use offscreen bitmaps?? I really think I'm going to need some sample 'C' or Pascal code to do this because I'm totaly confused. I understand what needs to be done to produce "flicker" free animation, but I can't figure out how to write it in code form and get it to work. Please, can someone hack up one of their graphics programs that uses offscreen bitmaps to show me code fragments on how to use and define them. Thanks, in advance, -franco franco@bbn.com franco%bbn.com@relay.cs.net ...!harvard!bbn!franco