Article View: comp.sys.mac
Article #1823Re: Quickdraw efficiency question
From: Amanda Walker
Date: Mon, 24 Jul 1989 22:37
Date: Mon, 24 Jul 1989 22:37
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1587 bytes
In article <2803@internal.Apple.COM>, maxie@apple.com (Keith G. Nemitz) writes: > Another method for drawing characters to the screen (and quite legal) is > to predraw the > the characterset into an offscreen buffer and use copybits to blast their > images to screen. I tried this once. I timed it, and on anything below a II, DrawText (or actually, StdText...) was *faster* than CopyBitsing each character. The only way I got any faster was to stuff things into screenBits, which is a major no-no. Even so, on a full screen of text on a Plus, I was a whole half a clock tick faster. I decided it wasn't worth it... For terminal emulators, anyway, you get much bigger wins by working on the emulator and serial port buffering code. I suspect that one reason that people like to claim that using the ROM to draw character is "too slow" is so that they can claim that their program's lack of performance is someone else's fault... -- Amanda Walker InterCon Systems Corporation -- amanda@intercon.uu.net | ...!uunet!intercon!amanda
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arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!cs.utexas.edu!uunet!intercon!amanda@intercon.uu.netReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!cs.utexas.edu!uunet!intercon!amanda@intercon.uu.net From: amanda@intercon.uu.net (Amanda Walker) Newsgroups: comp.sys.mac,comp.sys.mac.programmer Subject: Re: Quickdraw efficiency question Message-ID: <1304@intercon.UUCP> Date: 24 Jul 89 22:37:03 GMT References: <1681@neoucom.UUCP> <2803@internal.Apple.COM> Sender: news@intercon.UUCP Reply-To: amanda@intercon.uu.net (Amanda Walker) Organization: InterCon Systems Corporation Lines: 23