Date: Thu, 28 Nov 1996 12:21:49 -0500 (EST) From: Glen Miner To: Eli Zaretskii cc: djgpp AT delorie DOT com Subject: Re: Djgpp and Windoze Refresh In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII > > However, there have been confirmed allegations that my program fails to > > correctly redraw the screen when it is placed in the background and then > > brought to the foreground again. > > The following excerpt is from the DJGPP FAQ list. I don't know whether > this is true for Windows 95, and if so, what are your options other than > the ``redraw screen'' thingy suggested below. > > 10.3 Graphics screen restoring under Windows > ============================================ > > **Q*: When I switch away from my DJGPP program under Windows, then switch > back to it, graphics mode is down, or my screen is all messed up. Why?* > > *A* : Windows only saves the VGA screen in standard VGA modes (1..13h) when > you switch away from a DOS application. In any other mode it only > saves/restores the video mode *number*, but not the actual screen contents. > Your application is most likely still in the proper video mode (if not, it's > probably the fault of the Windows driver for your SVGA card), but the video > memory is messed up. The beauty of all this is that your program has no way > of knowing that the screen has been taken away and then returned to it. > > The only reasonable thing to do is to dedicate a "hotkey" in your application > (e.g., `Alt-R') whose action is to redraw the entire screen. If you do that, > it's best to start all the way from the beginning, with a call to > `GrSetMode', as there are a few bad Windows video drivers which do not > restore SVGA graphics modes properly upon the switch back. I had already read that section of the faq; I had posted in the hopes that somebody had come up with a better solution. :( Peace ===[ Gabo / [ABC] : gaminer AT undergrad DOT math DOT uwaterloo DOT ca ]=================== Latest ABC Shogi: http://www.undergrad.math.uwaterloo.ca/~gaminer/shogi.html "What Greenpeace spends in a year General Motors spends in four hours" -Moby