[commit] thumbnail image rendered in background thread

[Bill Haneman <Bi...@ireland.sun.com>]

Hi:

I have committed thumbnail background rendering, basically converting the
Thumbnail to use background rendering onto an offscreen buffer, same
as the main canvas.  I have also introduced a little new behavior to
ensure that the main canvas rendering waits for the thumbnail to
complete, on initial load of a document.  This usually happenned in the
past but with the introduction of threading into the thumbnail it
relied on race conditions without this bit of synchronization.

I expect this to be the last significant set of changes I make to
JSVGCanvas, unless I need to fix a regression that my testing
didn't uncover (hope not ;-).  I *do* expect to add some javadoc
comments to JSVGCanvas, the current javadoc comments are not
complete.

-Bill

>  Add threading to Thumbnail.  Also, when thumbnail is active,
>         main canvas background thread rendering will wait until
>         thumbnail is rendered.
> 
>  Modified Files:
>         sources/org/apache/batik/refimpl/gvt/text/ConcreteTextSelector.java
>         sources/org/apache/batik/refimpl/util/JSVGCanvas.java
>  

------
Bill Haneman +353 1 8199279
Ireland Desktop Engineering
Sun Microsystems Ireland Ltd.