Newsgroups: comp.sys.apple2
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!sdd.hp.com!news.cs.indiana.edu!ux1.cso.uiuc.edu!uxa.cso.uiuc.edu!jb10320
From: jb10320@uxa.cso.uiuc.edu (Jawaid Bazyar)
Subject: Re: QuickDraw II
Message-ID: <1991May18.193854.23381@ux1.cso.uiuc.edu>
Sender: usenet@ux1.cso.uiuc.edu (News)
Organization: University of Illinois at Urbana
References: <9105181855.AA17719@mcs.drexel.edu>
Date: Sat, 18 May 1991 19:38:54 GMT
Lines: 21

ujmurphy@KING.MCS.DREXEL.EDU (Jim Murphy) writes (in a bit of haste):

>albert erroneously wrote:

>> quickdraw does draw faster to off-screen grafports because it doesn't have
>> to do the 2/4-bit conversion when drawing stuff on-screen (did i get this
>> right dave?).

>     Wrongo! When drawing to _any_ GrafPort (onscreen or otherwise), QuickDraw
>II uses the portInfo record (LocInfo structure) of the GrafPort to determine
>what kind of pixel map it is dealing with. 

  Right- but The original assertion stands, if it's reason doesn't.  QuickDraw
II draws much faster to off-screen grafports because off-screen grafports are
in fast RAM.

--
Jawaid Bazyar               |  "Twenty seven faces- with their eyes turned to
Graduated!/Comp Engineering |    the sky. I have got a camera, and an airtight
bazyar@cs.uiuc.edu          |     alibi.."
   Apple II Forever!        |  I need a job... Be privileged to pay me! :-)