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From: aberno@questor.wimsey.bc.ca (Anthony Berno)
Newsgroups: comp.sys.mac.programmer
Subject: Quick drawing
Message-ID: <PcZ9T3w163w@questor.wimsey.bc.ca>
Date: 16 Dec 90 02:01:12 GMT
Organization: Questor: FREE Internet Access => +1 604 681.0670
Lines: 23

Hello, I'm a part-time Mac "programmer" (I don't know if I can elevate
myself to that status yet) that is working on real-time data acquisition
and analysis applications for the Mac II. I have a couple of things that
I would like some advice on.

First, I am trying to get a really fast way of doing 2-d color histograms.
This, of course, involves drawing LOTS of little color rectangles on the
screen. When drawing a little 2x2 rectangle, there are many ways of
doing it. You can use FrameRect, PaintRect, use a pen, etc. But what is
the fastest? I would rather avoid assembly language. Also, there are
a lot of colors that I have to use, usually about 10-20 absolute colors.
Would I get faster results if I were to bypass the Palette Manager and 
use lower-level tricks to get the right colors in the right rectangles?
And what about larger rectangles, up to 8x8 pixels?

Also, although this may sound kind of silly, I CANNOT figure out from
Inside Macintosh how to do something very simple - take a portion of
the image in a color window and save it to disk as a color PICT file.
A general pointer on how to do this (no pun intended) would be very
highly appreciated.

Thanks a 1,048,576.
-Anthony.