[webkit-qt] GraphicsContext and Canvas

[noam.rosenthal at nokia.com]

>-----Original Message-----
>From: webkit-qt-bounces at lists.webkit.org 
>[mailto:webkit-qt-bounces at lists.webkit.org] On Behalf Of ext 
>Ariya Hidayat
>
>> How often do we really need pixel access? What canvas 
>functions require QPixmap::toImage?
>
>Everytime the web developer uses the getImageData() and/or
>putImageData() of the canvas context.
>
>> Maybe we could find an alternative for those that doesn't 
>require the conversion?
>
>Not sure I fully understand what you mean here.
>
I thought you'd meant that we need toImage in something other than getImageData/putImageData. Now the picture is clearer.
How often do people call getImageData / putImageData? Do we call it in QtWebkit, or is it just the page developer's choice? If it's the latter, I don't feel we should make that heuristic cache inside QPixmap and not specific to HTML canvas, as it's a problem in applications in general that I've seen many times regardless of HTML canvas. If it's the former, we should make sure we don't call getImageData/putImageData unless we really have to.

But if you come up with a solution that does this and makes everything faster - I of course won't oppose, these are just opinions :)

>
>
>--
>Ariya Hidayat
>http://www.linkedin.com/in/ariyahidayat
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