On Tue, Sep 11, 2012 at 1:45 AM, Klemen Slavič <krof.drak...@gmail.com>wrote:
> First time poster. While I admit I haven't worked on WebKit code (yet), > I'm very familiar with its workings across different implementations > (desktop, mobile and otherwise). > > In my research regarding WebKit rendering performance, I've stumbled upon > an interesting artefact while animating spritesheet-based image animations. > I've written up a an article on the effects and metrics, including a > minimal test case to help demonstrate the effects on various > implementations: > > http://gist.io/3639830 > The way decoded images is handled depends on great many things. I suggest you to ask questions on webkit-help. The mailing list webkit-dev is about the development of WebKit A quick run in Instruments shows that, on my machine, blitting the images is the problem in this case. The hotspot has nothing to do with decoding the images. I would appreciate if you could update or remove the article to make sure we do not spread erroneous informations about WebKit through the mailing list. I remember reading somewhere in the WebKit archives (messages dated at > least one year ago) about keeping render objects removed from the tree by > caching them according to their URI, but have since been unable to locate > that specific message. From what I understand, the effects described in the > document seem to match up exactly with what I'm assuming is happening > inside the engine and according to Levi Weintraub's high-level description > of the rendering engine. > > I would greatly appreciate any feedback on the document, to help optimise > my approach when dealing with graphically intensive games and applications. > I wouldn't mind getting my hands dirty with the source if someone can point > me in the right direction. > I suggest you to use a profiler like Instruments' time profile. It will give you an idea of where the time is spent without making assumptions based on behaviors. Regards, Benjamin
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