[Webkit-unassigned] [Bug 44528] Improve FEGaussianBlur algorithm to access image buffer memory directly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=44528





--- Comment #12 from Alejandro G. Castro <alex at igalia.com>  2010-10-25 06:03:15 PST ---
(In reply to comment #10)
>
> [...]
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> I already checked and tested ByteArray* an unsgined char* and couldn't see a difference in performance. I took the attached SVG on bug 48174 as reference. On Mac put/ and getImageData just take 0.8% of the time, GaussianBlur algo itself took 96% of the time. On my machine I could reduce the rendering time from 31s to 21s just by eliminating the -> operators and accessing the pixel data via ByteArray instead of CanvasPixelArray. 21s is still to much, but I don't see huge improvement by implementing direct pixel data access on ImageBuffer right now. Even so I'd support it!
> 
> Do you plan to investigate on this more?
>

Oh, nice, good to know. If you think it makes sense I can spend time doing some profiling and check how we could do it (integrate contextshadow I guess it is an option). Althougth I'm afraid that this operation is not going to be good enough if we can not make it in specific hardware or reduce the amount of blurring area.

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