Long time no see. I would like to share some of progresses about threaded compositor for WebKitGtk. First of all, I made a another prototype about it and I push it on github. https://github.com/ryumiel/webkit-experimental/commits/threaded-compositing
*Needs discussion, and clean up. (For Gtk port)* 1. There are 3 accelerated compositing methods in WebKit1 Gtk. Cairo, Clutter, and GL. These patches will adds 1 more options, threaded compositing. I think we need to simplify/unite rendering paths to reduce complexity. 2. In these patches, I attached threaded compositor into webkit1 gtk with untidy codes. (ex ChromeClientGtk, FrameLoaderClientGtk.. ) I think if we need to maintain 4 compositing paths at a time, we need more cleaner approach, with a single interface & factory. 3. pixel tests.. our team runs pixel tests internally, but we couldn't find a way to run it using xvfb, yet. As soon as we find a way, we will enable pixel tests. *Remaining Problems* 1. We need to solve this bug: https://bugs.webkit.org/show_bug.cgi?id=108899 , I will do this job from this week. 2. In WebKit Gtk, It uses XDamage extension to provide a callback mechanism for repainting Gtk Widget in accelerated compositing case. But, what I experienced is, whenever I placed a mouse pointer on top of webview that has css3 animations, Xorg server uses almost 34% of cpu time. (My desktop has quad-core, therefore, Xorg server eats a core alone.) When I tried to render layers on on-screen window surface directly, this problem didn't come up. 3. Scrolling with a mouse wheel does not update scrollbars in webview. I think I miss some events about that. Minor problem. 4. Sometimes, changing viewport size of webview causes some tiles to be broken. I don't have a idea about that yet, I need to look at codes. *Remaining work items* 1. handle zoom. 2. handle viewport attribute. Thanks. ( I sent this e-mail with a wrong address, sorry mrobinson and noamr for duplicated email.)
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