On 4/8/11 4:52 PM, Gregers Gram Rygg wrote:
Hi,I've been playing around with latest version of OpenLayers from svn. Great work on the mobile version :) Found a little trick to vastly improve the pinch-zoom performance on iPhone/iPad: img.olTileImage { -webkit-transform: translate3d(0, 0, 0); }
Thanks for passing on the tip. I don't see a noticeable difference in the iOS simulator, but I'll try on a real device later.
I'm thinking that due to the "new and buggy" nature of the hardware accelerated transforms and our proximity to a 2.11 release, it doesn't make sense to drop this in at this point.
It is certainly something we can suggest people use. And if we find that it brings more benefits than drawbacks, I think it makes sense to include in the style.css we ship.
Interested to hear how it works for others. Tim
For some strange reason translate3d is hardware accelerated in Mobile Safari while the regular translate is not. I first tried to rewrite the PinchZoom control to use translate3d with 0px in the z-axis, but that made the pinch zoom to behave differently. Turns out that just having translate3d(0,0,0) on the tiles combined with a scripted translate in the PinchZoom control is enough to trigger hardware rendering. Not sure how this affects Android and other webkit-browsers. Briefly tested in Chrome 10, 11, 12, Safari and on a HTC Desire. Have had Safari on my iPad crash a few times lately, but not sure if it's related to the translate3d or not. Thomas Fuchs has written a bit more in-depth research on how to make smooth animations for iOS: http://mir.aculo.us/2010/06/04/making-an-ipad-html5-app-making-it-really-fast/ Is it ok if I include the style rule above in style.css, or shoud we do some device/feature detection and add a custom css-class to apply the 3d-hack? Regards, Gregers _______________________________________________ Dev mailing list d...@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/openlayers-dev
-- Tim Schaub OpenGeo - http://opengeo.org Expert service straight from the developers. _______________________________________________ Dev mailing list d...@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/openlayers-dev
