Path: utzoo!mnetor!uunet!dalcs!garfield!john13
From: john13@garfield.UUCP (John Russell)
Newsgroups: comp.sys.amiga
Subject: Problem setting drawmodes
Message-ID: <4364@garfield.UUCP>
Date: 10 Jan 88 23:23:57 GMT
Distribution: na
Organization: CS Dept., Memorial U. of Newfoundland, St. John's
Lines: 39
Keywords: SetDrMd RastPort

Is there a recommended way to determine the drawmode of a rastport so that it
can be restored later? The rastport isn't mine so what I have been doing is
reading the DrawMode tag straight from the RastPort structure.

The sequence goes something like this:

- LockLayerRom a window
- read DrawMode variable
- set DrawMode to complement
- draw rubber-band box in window, erase when done
- SetDrMd using the DrawMode read earlier
- UnlockLayerRom the window

Now if nothing is writing into the window when I do this, it works fine. And
about 50-75% of the time, even if the window is being written to or scrolling
when I do it the drawmode gets changed back properly.

However fairly frequently the window will remain in COMPLEMENT mode, and stays
that way under almost every subsequent condition (though I have found 1 program
that resets it - this is a con: window I am talking about).

Something else I tried was reading both the Flags and DrawMode values directly
and sticking them back in manually when I was finished. Also no go.

So exactly which structure values do I have to preserve in the rastport when
I finish? Perhaps one or more of the drawing pens, or window structures in
addition to the rastport ones?

Help on this will be appreciated, version 1 of this program would be posted
by now if this hadn't happened.

John

PS Just try doing "ln" sometime with your CLI in complement mode ;-).
-- 
"Operating systems room, prepare for shutdown."
"I never thought I'd be HAPPY to see our ratings do DOWN!"
		-- lots of these were sprinkled throughout the 
		   last broadcast episode of _Max_Headroom_