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- Newsgroups: comp.sys.mac.programmer
- Path: sparky!uunet!stanford.edu!CSD-NewsHost.Stanford.EDU!Xenon.Stanford.EDU!tecot
- From: tecot@Xenon.Stanford.EDU (Edward M. Tecot)
- Subject: Re: Why would this slow down QuickDraw
- Message-ID: <tecot.724971807@Xenon.Stanford.EDU>
- Sender: news@CSD-NewsHost.Stanford.EDU
- Organization: CS Department, Stanford University, California, USA
- References: <1992Dec21.092809.10504@cactus.org>
- Date: 21 Dec 92 21:03:27 GMT
- Lines: 19
-
- rdd@cactus.org (Robert Dorsett) writes:
- >I've noticed some interesting interaction problems with VersaTerm 4.1 and
- >flight simulators, including one I'm working on. The basic problem appears
- >to be that if VersaTerm is up, then the graphics performance of the simulators
- >(MS FS, Hellcats) goes through the floor. In my own program, the performance
- >loss is as much as 50%, on straight bitmap-copying. Even with the same program
- >running, if VersaTerm is then quit, performance goes back to normal.
-
- >Can anyone suggest a reason why this is happening?
-
- If VersaTerm is in front of the simulator, then it's because Quickdraw must now
- do extra work to clip the drawing to the grafPort. If VersaTerm is in the
- back, then I suspect it's because VersaTerm has to set up an interrupt routine
- to ensure that it doesn't drop any characters. Obvious experiments to test or
- prove these hypotheses: Try the same thing with TeachText instead of
- VersaTerm. If the behavior is the same, it's likely the first case. If not,
- it's likely the second.
-
- _emt
-