[webkit-dev] parallel painting

[Charles Pritchard]

On 6/9/2011 8:24 PM, Pierre-Antoine LaFayette wrote:
>
> Android uses a retain mode rendering approach as well; where paint 
> operations are recorded on a WebCore thread and painting is actually 
> done on the UI thread. It isn't necessarily the best approach. But I 
> suppose it depends the platform whether or not there is much to gain. 
> You still need to worry about synchronization.
...
> On 6 April 2010 03:24, Eric Seidel <eric at webkit.org 
> <mailto:eric at webkit.org>> wrote:
>
>     Parallel painting would only be useful if the graphics layer is
>     incredibly slow.  In most WebKit ports we do not see very much time
>
...
>
>     On Sat, Apr 3, 2010 at 10:32 PM, Zoltan Herczeg
>     <zherczeg at inf.u-szeged.hu <mailto:zherczeg at inf.u-szeged.hu>> wrote:
>     > Hi,
>     >
>     > I am working on a parallel painting feature for WebKit (bug id:
>     36883).
>     > Basically it records the painting commands on the main thread,
>     and replay
>     > them on a painting thread. The gain would be that the recording
>     operation
>

Is this something that could be used to "duplicate" painting commands?

I'm very interested in enabling secondary painting contexts,
to enable better representation of Zoom, and other common assistive 
techniques.

Example:
If the recording is used, prefixed with scale and crop, a user could be 
presented with
a crisp and clear magnification of a focused region or other sub-region.

Such techniques could also be useful for remote viewing, via serialization,
and for efficient screen dumps [assuming the render works, of course].

It'd be great, if some time, secondary user agents, like the popular 
ZoomText Magnifier,
were able to interact with WebKit and request regions to be painted at a 
higher resolution,
so as to display the magnified image at native resolution.

Does that make sense? Is that something that this technique might 
eventually provide?

I suspect that screen mirroring and other forms of screen sharing will 
become more common
in use, as more and more physical screens become common in our common lives.

-Charles
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