Path: utzoo!attcan!uunet!lll-winken!ames!ncar!tank!uxc!uxc.cso.uiuc.edu!uxg.cso.uiuc.edu!uxa.cso.uiuc.edu!wwl90321
From: wwl90321@uxa.cso.uiuc.edu
Newsgroups: comp.sys.mac.programmer
Subject: help! large offscreen map
Message-ID: <227700002@uxa.cso.uiuc.edu>
Date: 15 Jan 89 12:31:00 GMT
Lines: 20
Nf-ID: #N:uxa.cso.uiuc.edu:227700002:000:949
Nf-From: uxa.cso.uiuc.edu!wwl90321    Jan 15 06:31:00 1989


Hello out there!
I was wondering if anyone could tell me what I am missing, it's near
dawn and I can't seem to find the bug! erg!

The problem is this:
i'm doing my work offscreen and then copy bits into an onscreen window.
This works fine for window/offscreen sizes that are less than or
equal to desktop size but if I go bigger (800x800) the window shows
a mess of memory except for a nice square white area in the
upper left, from fiddling I think that somehow my offscreen is
being clipped by the desktop!  however, when I transfer control
from the window to the offscreen bitmap (with setportbits) I
have made sure that offscreen's bitmap.bounds is 800,800 I even
made theport^.portrect equal to the 800x800 before I did an
eraserect 800x800.  Am I missing a mysterious third rect that produces
the visible region? The book says never touch visrgn so I guess
I won't. Any other help would be much appreciated! please send
email. thanks!
-Mark