[Webkit-unassigned] [Bug 39582] [Gtk] very slow page scrolling on big -webkit-box-shadow areas

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=39582





--- Comment #5 from Alejandro G. Castro <alex at igalia.com>  2010-05-25 05:05:44 PST ---
(In reply to comment #3)
>
> [...]
> 
> The clipping is one solution, but can have some bad sideeffects. Imagine a rect 
> that you want to blur. We create an ImageBuffer, large enough, so that we have 
> enough place for the rect itself and the resulting blurred edges on the sides. 
> If we clip the rect and the image to the viewPort size, the actual visible size 
> of the screen, the edge on the bottom (if the rect is clipped on the bottom) 
> gets also blured. Of course that can be fixed and it will be more efficient 
> than the current implementation, but to make the shadowImage as small as 
> possible and therefore the number of pixels that need to get blurred as small 
> as possible would be the fastest way.

I understand, thanks for the comments, I'll try your proposal to create a smaller image and use it as a patter then.

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