Article View: comp.sys.mac
Article #1238Re: Quickdraw efficiency question
From: Amanda Walker
Date: Tue, 11 Jul 1989 17:35
Date: Tue, 11 Jul 1989 17:35
21 lines
1433 bytes
1433 bytes
In article <1681@neoucom.UUCP>, sam@neoucom.UUCP (Scott A. Mason) writes: > Intuitively, I would think that DrawString would be faster, but then again, > doesn't DrawString make repeated calls to DrawChar? BTW, I want to do this > for a terminal emulation program, and want maximum screen drawing speed. > > While I'm at it, how does Mackermit achieve such speedy screen drawing?? Building a string and drawing it with DrawString (or DrawText) is *much* faster. This is what MacKermit does. This is one case where your initial intuition about which would be faster is wrong. As it turns out, DrawChar is done by drawing a string of 1 character... One of the reasons for the speedup is that the font information is retrieved once per string, so the fewer times this is done, the faster the text shows up. -- 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!tut.cis.ohio-state.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!tut.cis.ohio-state.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: <1167@intercon.UUCP> Date: 11 Jul 89 17:35:51 GMT References: <1681@neoucom.UUCP> Sender: news@intercon.UUCP Reply-To: amanda@intercon.uu.net (Amanda Walker) Organization: InterCon Systems Corporation Lines: 21