[Accessibility] Sec 2b Item 6: Service API Support for Magnification

Sharon D Snider snidersd at us.ibm.com
Tue Sep 9 08:08:13 PDT 2003




Hi Janina, a few suggested changes:

6.)Service API Support for Magnification

Service API support for magnification should make it possible to provide
sophisticated magnification of one or more portions of the video display
screen for users who require, a larger or different font, and alternate
foreground or background color.

In addition, magnification of icons and text should be able to achieve a
wide range of magnification ratios. Many users with visual disabilities
need 3X, 4x, etc. magnification, while other users can benefit from ratios
as small as 1.2% magnification.

Currently it is not possible to achieve magnification without requiring
high-end video
hardware with multiple frame buffering. This should not be a requirement.
Also, the user should be able to maintain magnification while applications
are writing to the screen.

Historically the networked nature of the X technology has not made it
possible (nor desirable) for AT to replace device drivers or write directly
to video hardware. By creating this standard, significant cooperation with
X, GNOME, and KDE developers would be required.

There are currently projects under development, among some vendors, that
can provide reference implementations.

Sharon Snider

Linux Accessibility, and Information Development
IBM Linux Technology Services
(512) 838-4127, T/L 678-4127

----- Forwarded by Sharon D Snider/Austin/IBM on 09/09/2003 09:54 AM -----
                                                                                                                                                
                      Janina Sajka                                                                                                              
                      <janina at rednote.net>              To:       accessibility at freestandards.org                                               
                      Sent by:                          cc:                                                                                     
                      accessibility-admin at freest        Subject:  [Accessibility] Sec 2b Item 6:  Service API Support for Magnification         
                      andards.org                                                                                                               
                                                                                                                                                
                                                                                                                                                
                      09/08/2003 01:48 PM                                                                                                       
                                                                                                                                                
                                                                                                                                                





             6.)         Service API Support for Magnification

It should be possible to provide sophisticated magnification of one or more
portions of the video display screen to users who require large (or
different) fonts and/or alternate foreground/background colors. It should
be possible to magnify icons along with text. And, it should be possible to
achieve both smaller and large magnification ratios, many users with visual
disabilities may need 3X, 4x, etc. magnification, but many users would also
benefit from ratios as small as 1.2% magnification.

It should be possible to achieve this feature support without requiring
higher-end video
hardware with multiple frame buffering as is the case today. Also, it
should be possible to maintain magnification while applications are writing
to
screen.

Because of the historic networked nature of the X technology, it is not
possible (nor desirable) for AT to just replace device drivers or write
directly
to video hardware. creating this standard will require significant
cooperation with X, GNOME, and KDE developers. There are already projects
under
development among some vendors which can provide reference implementations.
--

                                                 Janina Sajka, Director
                                                 Technology Research and
Development
                                                 Governmental Relations
Group
                                                 American Foundation for
the Blind (AFB)

Email: janina at afb.net                      Phone: (202) 408-8175

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