Path: utzoo!utgpu!water!watmath!clyde!bellcore!decvax!decwrl!sun!quintus!pds
From: pds@quintus.UUCP (Peter Schachte)
Newsgroups: comp.sys.amiga
Subject: Clipping
Keywords: windows clipping rastport
Message-ID: <658@sandino.quintus.UUCP>
Date: 17 Feb 88 21:34:20 GMT
Organization: Quintus Computer Systems, Mountain View, CA
Lines: 24

A question for all you Gurus (sorry if this is an old, stale question):
what is the blessed way to clip stuff to the inside of a window?  I
don't want to waste the space of a SMART_REFRESH or GIMME_ZERO_ZERO
window, I'm using SIMPLE_REFRESH.

Right now I'm just displaying text, but later I may want to do graphics
in my window.  I don't want to have to clip everything I put in the
window myself, I want the system (hardware?) to do it for me.

What I've been doing is changing the window's clipping rectangle before
I draw, and resetting after I'm done.  The problem with this is that
when I have a scroll bar in the right margin of my window, and I mouse
in it while my code is redrawing the contents of the window, the
elevator box in the scroll bar is not changed.  I suppose I could
forbid()/permit() around my drawing, but it may take a while to fill
the window, and this doesn't seem very sporting.  Or I could try to
redraw the window in small installments, and forbid()/permit() around
them.  But what I'd really like is to have my own clipping rectangle
for the inside of the window, like a GZZ window, without having the
overhead of another bitmap.  Any suggestions?
-- 
-Peter Schachte
pds@quintus.uucp
...!sun!quintus!pds