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From: rick@jessica.stanford.edu (Rick Wong)
Newsgroups: comp.sys.mac.programmer
Subject: Re: New SetDepth call
Keywords: System 6.0.5, Graphics Devices Manager
Message-ID: <1990Jul27.214223.6704@portia.Stanford.EDU>
Date: 27 Jul 90 21:42:23 GMT
References: <1990Jul26.183633.10926@portia.Stanford.EDU> <43382@apple.Apple.COM>
Sender: news@portia.Stanford.EDU (USENET News System)
Organization: Academic Information Resources
Lines: 34


Thanks to all who replied to my query about SetDepth.  (I was using the
tech notes that were in the Inside Mac VI stack on the Sys 7.0a9 CD.)
Using the corrected inline definition almost works, except . . .

My machine crashes when I try to use it.  (Waaaaahhhhhhh!)  The symptoms
are as follows:

    Going from 8 -> 1-bit:
	-- my screen blanks out
	-- I drop into MacsBug with a bus error
	-- when I do an ExitToShell, the screen is in 1-bit mode

    Going from 1 -> 8-bit:
	-- my screen blanks out	
	-- I drop into MacsBug with a bus error
	-- when I do an ExitToShell, the screen is in 8-bit mode
	-- when I reboot, the screen is changed from color to grayscale

The calls I make to SetDepth are:

    if (oldDepth == 1) {
	successful = (SetDepth(mainDev, 8, 0, 0) == noErr);
    } else {
	successful = (SetDepth(mainDev, 1, 0, 0) == noErr);
    }

I am doing this on a IIfx with System 6.0.5.  The crashes occur even when
I have removed all skanky inits from my system folder.

Once again, thanks for any help.

Rick Wong
rick@jessica.stanford.edu