[g-a-devel]Magnification utility enhancements

[Bill Haneman <Bill Haneman Sun COM>]

Hi:

In response to a request I have added initial implementation for several 
more bits of the Accessibility_Utility::Magnifier implementation.

Now implemented:

clearAllZoomRegions
deleteZoomRegion
resizeZoomRegion
createZoomRegion

Note that we still only support one zoom region, so the 
"createZoomRegion" API is only functional either if the magnifier was 
created without an initial zoom region (via a new commandline flag, 
--no-initial-region) or clearAllZoomRegions was called.  

I believe that calling createZoomRegion () after deleteZoomRegion (0) 
also will work; in other cases createZoomRegion will fail with a return 
value of -1 (the normal return code is the index of the newly created 
region).

resizeZoomRegion (called on region '0') should work in all cases unless 
the first zoom region has been destroyed via destroyZoomRegion or 
clearAllZoomRegions.

best regards,

Bill

------
Bill Haneman x19279
Gnome Accessibility / Batik SVG Toolkit
Sun Microsystems Ireland