busey@blake.u.washington.edu (Thomas Busey) (11/28/90)
The 32 bit quickdraw command NewScreenBuffer appears to create a pixmap associated with a graphics device. What I want to know is could a programmer set up more than one of these screen buffers at the same time for one device and flip between them on the refresh. This technique is similar to using the alternative video page buffers on small-screen macs. Note that I want to avoid using copybits to stamp the offscreen image onto the screen because that takes time, especially 8 bits deep. These screen buffers would be switched by changing the pmap handle of the gdevice record for that monitor. I know that this doesn't work for small-screen macs, but why would the NewScreenBuffer include a gdevice as a VAR parameter in its procedure call? To change the value of the pmap handle? That's what I'm hoping. Any advice, e-mail or posted, would be appreciated. Tom Busey busey@blake.u.washington.edu Quotes about the old I-90 floating bridge currently at the bottom of Lake Washington: "Concrete's not supposed to float anyway" "Just tell people from S. F. that it's a new BART" "It's all water over the bridge now"