I'd like to share with the community a project I'm working on, while it's still in its development phase (isn't that what labs is for? :))
The goal of the project is to get CSS3 animations to a reasonable FPS performance, mainly on embedded hardware where it's a pain.
The idea is to implement webkit's GraphicsLayer concept, which allows platform-specific implementations of CSS transform and opacity animations, using the graphics-view and the Qt animation framework as a backend. This would only work for QGraphicsWebView and not for QWebView, as rendering a separate QGraphicsScene inside QWebView would probably not give us much performance benefit.
Preliminary results are very promising - The leaves demo, for example, runs 4 times faster on Maemo Fremantle than it does without the acceleration, and it looks graphically accurate.
The reason this gives us a performance benefit is mainly because of graphics-item caching: when a CSS animation occurs inside webkit, the item that's being animated has to go through a re-layout and re-draw every so often, while with the accelerated approach we draw it once into a QPixmap (QGraphicsView takes care of that) and then it's just a series of fast and furious pixmap blts. The hardware acceleration becomes relevant when the images are big and the blt itself becomes a bottleneck.
This project is not ready to go upstream, as it supports many delicate use-cases that need to be tested. But if you're interested in participating (or to just comment!), this has so far been a fun project to hack on.
./WebKitBuild/Release/bin/QGVLauncher --accel: This will enable the necessary web-setting for composite-layer acceleration. You can also create a small QGraphicsWebView example yourself, as long as you enable the new settings flag: QWebSettings::AcceleratedCompositingEnabled
Download the latest release here: www.qt.io/download.
Qt 5.12 was developed with a strong focus on quality and is a long-term-supported (LTS) release that will be supported for 3 years.
Check out all our open positions here and follow us on Instagram to see what it's like to be #QtPeople.
Näytä tämä julkaisu Instagramissa.
Want to build something for tomorrow, join #QtPeople today! We have loads of cool jobs you don’t want to miss! http://qt.io/careers #builtwithQt #software #developers #coding #framework #tool #tooling #C++ #QML #engineers #sales #tech #technology #UI #UX #CX #Qt #Qtdev #global #openpositions #careers #job
Henkilön Qt (@theqtcompany) jakama julkaisu