On a side note, fully tracking the visibility of images is bug 847221, but that isn't going to tell you if the image is visible, just when it isn't.
-- - Milan On 2013-09-13, at 10:25 , Benjamin Smedberg <benja...@smedbergs.us> wrote: > ... > > In general we don't track visibility of objects, and computing one more of > these kinds of visibility can be rather expensive. We do have heuristics for > plugins to inform them when they can stop painting, but that involves special > code on plugin elements to track their layer state, and wouldn't scale to > arbitrary elements (and it's focused on painting visibility so that even > windows which "cover" the plugin make it invisible). _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
