[Webkit-unassigned] [Bug 43259] Add the shadow offset as a parameter to the GraphicsContext::setShadow

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=43259





--- Comment #14 from Alejandro G. Castro <alex at igalia.com>  2010-08-23 01:32:08 PST ---
(In reply to comment #13)
> > ....the information is interesting to know what part of the shadow is visible.
> 
> Not sure what shadow visibility do you need here?

Basically we need the part the shadow that is not under the figure that causes that shadow. For example, if you set an offset of 0px 0px in the CSS when you generate the shadow you can use tiles that just cover from the border of the figure to the end of the blur effect; but if you have 300px 300px you need to create bigger tiles to recreate the shadow.


> While working on https://bugs.webkit.org/show_bug.cgi?id=44091 for the Qt port, I found out that I can use the clip region to significantly reduce the shadow area needs to be filtered.

That's a very interesting improvement, thanks for sharing it, I was thinking about checking it after landing the tiling shadow buffer, I'll check it. Anyway if we want to create the tiling solution we need this information.

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