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From: Lawson.English@p88.f15.n300.z1.fidonet.org (Lawson English)
Newsgroups: comp.sys.mac.programmer
Subject: Re: How to access frame buffer on Mac II?
Message-ID: <2074.27B62531@stjhmc.fidonet.org>
Date: 10 Feb 91 07:27:03 GMT
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Jennifer S Lanham writes in a message to All

JSL> Sorry, I should have stated that QuickDraw is too slow for what 
JSL> I am trying to do. I WANT to get around its slowness by drawing 
JSL> directly to the frame buffer. I can do it on a plus. Does anyone 
JSL> know how to draw directly to the frame buffer on a Mac II? Any 
JSL> suggestions welcome and appreciated. 

Sorry, I have problems with E_Mail, but I'd like to point out that QD can be
speeded up through various means:\

1) bypass the trap dispatcher; if you are doing lots of pixel manipulation,
the 100+ cycles-per-trap-call overhead can kill you. Use NGetTrapAddress to
jump directly to where you need to go.
2) offscreen bit/pixel maps can speep things up amazingly as you don't need
to worry about clipRgns, etc whilest drawing.
3) I seem to recall that FillRect can actually be faster than LineTo for drawing
lines...


Just some suggestions for keeping withing Apple guidelines. 


Lawson
 

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