pashler@sdics.ucsd.EDU (Hal Pashler) (07/21/88)
Does anyone know an easy way to turn on and off the whole video display on the MAC II (we have the MAC II color video monitor, with color upgrade, if that's relevant)? We want to be able to draw a screen full of images (which will take us several hundred msec), and display this screen full instantaneously (i.e., within a single refresh), and to be able to turn the whole thing off equally quickly. By the way, we are using lightspeed pascal for this application. THANKS! hal pashler ucsd cognitive science pashler@nprdc.arpa
ech@poseidon.UUCP (Edward C Horvath) (07/22/88)
> Xref: poseidon comp.sys.mac.programmer:1518 comp.sys.mac:18930 > Does anyone know an easy way to turn on and off the whole > video display on the MAC II (we have the MAC II color video > monitor, with color upgrade, if that's relevant)? > We want to be able to draw a screen full of images (which will > take us several hundred msec), and display this screen full > instantaneously (i.e., within a single refresh), and to be > able to turn the whole thing off equally quickly. On a 4- or 8-bit video board, you can do the job with a degenerate form of color animation: use the Color Manager's SaveEntries trap to save the color table, set every color to black, draw your image, then RestoreEntries. The last step essentially consists of setting 256 longWords on an 8-bit board, and really ought to look pretty well instantaneous, i.e. should be able to run completely between frames. =Ned=