[webkit-dev] WebCore GPU module

Dean Jackson dino at apple.com
Wed Jun 18 16:23:45 PDT 2014

The Loop-Blinn code is dead and should be removed from WebKit. I believe Ken Russell implemented it to help with some Chrome/Skia drawing performance, but since then Skia itself updated to use a similar GPU-accelerated approach.


On 18 Jun 2014, at 6:07 pm, Michael IV <explomaster at gmail.com> wrote:

> Hi All.I have been investigating into WebKit text rendering details and I found Loop-Blinn implementation in GPU directory of WebCore.I have tested it and it kind of works ok for convex shapes rendering which probably should be ok for text glyphs outline as well.
> But I have got a couple of question regarding this module:
> 1)Is it used by the browsers to render text or 2d shapes?
> 2)Is it actually ready for real-life usage?
> 3)How anti  aliasing is handled?I mean ,I found that only curves are anti-aliased(internally by the shader) but the straight line outlines need proper MSAA which can be pretty expensive or even unavailable  on some platforms.
> Also I found a bug: when drawing a path with two overlapping convex shapes ,the hole created on the overlap region which is aliased.
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