Hey fellow developers, I don't know if you saw the enthusiastic tweets (e.g. https://twitter.com/19_norte/status/281134258725199875), but http://ahocevar.github.com/openlayers/mobile-wmts-vienna/examples/mobile-wmts-vienna.html shows the improvements in tile rendering we can get with four pull requests. All these pull requests have been thoroughly tested, and are the result of client work at OpenGeo. To bring these improvements into master, I am asking for reviews:
http://github.com/openlayers/openlayers/pull/702 New tile image cache and tile queue improvements. This pull request gets rid of the current tile queue, which I know many people were unhappy with. It adds a new TileManager class, which delays tile loading for panning (replacement for previous tileLoadingDelay in Layer.Grid) and zooming to avoid unnecessary tile image requests. It also keeps references to image elements, so they can be reused when the user pans or zooms back to regions or zoom levels that were already visited. http://github.com/openlayers/openlayers/pull/800 Use translate3d to enable GPU support where available. This introduces an applyTransform method on the map, which will use an appropriate positioning method for the layerContainerDiv. Without any transform3d styles on the layerContainerDiv, style.left and style.top will be used just like we currently do, and scale transforms will be used for scaling. But with a translate3d style on the layerContainerDiv, all positioning is made with translate3d, and scaling is done with scale3d. By doing so, the GPU kicks in and brings greatly improved dragging and pinch-zooming performance. http://github.com/openlayers/openlayers/pull/503 Animated zooming. This depends on #800, and I will rebase it when #800 is in. For now, it is best to look at the three commits mentioned in https://github.com/openlayers/openlayers/pull/503#issuecomment-11495176. This change includes some improvements to the MouseWheel handler, and better mousewheel defaults for the Navigation control, to allow for usable and predictable wheel zooming on touch pads. http://github.com/openlayers/openlayers/pull/803 Tween: skip frames when minimum frame rate is not reached. We use requestAnimationFrame for tween already, but we have no control over the frame rate. This change introduces a new minFrameRate option. When set, frames will be skipped if the animation gets too slow. The effect of this can best be seen when zooming with #503 applied in Firefox: instead of the 20 frames (which work fine in Chrome), about half of the frames will be skipped because Firefox can not scale the layerContainer fast enough. The visual effect of animated zooming still works fine, and users do not have to wait too long for the zoom to finish. Thanks for any reviews! With these changes in, the visual appearance and performance of OpenLayers will be on par with Leaflet. Andreas. -- Andreas Hocevar 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
