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From: alen@ttidca.UUCP (Alen Shapiro)
Newsgroups: comp.sys.mac
Subject: mac video - drawing into ScreenBits fast?
Message-ID: <206@ttidca.UUCP>
Date: Thu, 13-Nov-86 13:35:38 EST
Article-I.D.: ttidca.206
Posted: Thu Nov 13 13:35:38 1986
Date-Received: Tue, 18-Nov-86 09:13:29 EST
Distribution: net
Organization: CITICORP TTI, Santa Monica, CA
Lines: 10

I am attempting to draw onto the mac screen in real time using my own
very fast 3 line 68000 code memory-to-memorymap copy function. There
seems no way to tweek this code so that I can redraw full screen images
at full 60 Hz refresh rate. Since I have all the images I want to display
"in core" is there a way to retarget the video display mechanism to read from
other areas of memory (I have more than 2 images so the alternate screen
buffer (which may go away in future) does not seem to be a help). I currently
achieve better than 30 frames per second - but really need 60.

--alen (the Lisa slayer) shapiro