I am writing an Xlib based screen magnification program for X called BlindPenguin (http://www.blindpenguin.org). In great wisdon of great folly I have dicided to use DGA to write this program. I am looking for DGA code examples I have looked at the dga prog which changes your screen colour, but i need more. freshmeat.net has one or two games which use DGA and I'm hoping someone here has something?
Setting the mode lines in XF86Config isn't really an option for a person with my sight level unless it is possible to set a Mode line which will make the screen 8 times its normal size.
BACKGROUND INFORMATION The issue is this any X magnification program that I have seen draws the magnified area on a window I DO NOT WANT TO DO THIS. I want to write a program, which zooms in like a video camera on a particular part of the screen what will happen is that the magnified area of the screen will fill the entire screen, in simple terms the magnified area will be re-drawn with more pixels to fill the screen. However the X server and clients shouldn't care about this in-fact they shouldn't know. Basically there are 2 screens 1 is the screen that the X server creates and the other is the screen that the user sees. As I move the mouse around the X server moves it on the real screen but the user sees the magnified screen moving. To use the video camera analogy again imagine a person walking around a room using the view finder of a video camera turned up to full zoom to see. Their coordinates would change relative to the objects in the room but they would see things much larger than they are.
Kieran,
I don't know that DGA will help you much in this regard, it's mostly oriented towards accessing the framebuffer in the render portion of the graphics subsystem. You can try running the minimum mode supported by your graphics card/display and set a much larger virtual desktop to pan around in, but if you need more magnification than that, I think you're going to need some type of support for replicating pixels in the display portion of the graphics subsystem. There are lots of ways that can be done, but I can't think of any that are already implemented and ready to go.
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Jens Owen / \/\ _
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