[g-a-devel]Re: [blindpng sdf lonestar org: Full Screen Magnification for X Windows] (fwd)

[Michael Meeks <michael ximian com>]

Hi Kieran,

	Osvaldo forwarded me your mail:

	As you notice, it is almost crucial to have Xserver support to do fast
magnification - particularly for the scaling.

	However - we already have a working project using Gnome a11y
infrastructure - which lets us do some very nice things (well beyond
following the mouse), which is fairly powerful already.

	It's called 'gnome-mag', it's in Gnome CVS (see
http://developer.gnome.org/). Of course - it requires a fairly recent
Gnome [ 2.2 should do nicely ], and works best in conjunction with
gnopernicus, also from CVS there.

	It'd be great to have you working with us, improving this.

	Best regards,

		Michael.

On Tue, 2003-03-11 at 16:28, Osvaldo La Rosa wrote:
> ----- Forwarded message from Kieran O'Sullivan <blindpng sdf lonestar org> -----
> Date: Mon, 10 Mar 2003 11:45:06 +0000 (UTC)
> From: "Kieran O'Sullivan" <blindpng sdf lonestar org>
> Subject: Full Screen Magnification for X Windows
> To: debian-accessibility lists debian org
> 
> BlindPenguin - X Windows Accessability Project
> http://www.blindpenguin.org
> kieran osullivan blindpenguin org
> SDF Public Access UNIX System - http://sdf.lonestar.org
> 
> I am writing an Xlib (written in c) based screen magnification program for
> X Windows called BlindPenguin (http://www.blindpenguin.org).  I am posting
> to this group to get ideas on a technical issue with the program.  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.
> 
> WHAT I AM LOOKING FOR
> 
> I am looking for ideas or code that will help me do this Especially DGA
> code.  Also anyone who
> has knowledge of how programs like ZoomText or Lunar do this in Windows
> I would like to hear of it, I know that ZoomText doesn't work in X but
> the ideas may inspire me.
> 
> THIS PROGRMA WILL BE RELEASED UNDER GPL
-- 
 mmeeks gnu org  <><, Pseudo Engineer, itinerant idiot