On 11 Sep 2013, at 3:20 am, Robert O'Callahan <rob...@ocallahan.org> wrote:
> On Tue, Sep 10, 2013 at 1:26 PM, Rik Cabanier <caban...@gmail.com> wrote: > There's a thread on www-style: > http://lists.w3.org/Archives/Public/www-style/2012Nov/0144.html > It's been in firefox for a while and blink is going to ship it soon: > https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/RyUSi3zdumQ > > devicePixelRatio has reflected page zoom in Firefox ever since we first > exposed it (because the thing it maps to internally has always been affected > by page zoom). OK. I can accept that it makes sense for page zoom (I was only thinking about pinch zoom... which is a bad name). Still, we've (Apple) been telling developers for a long time that devicePixelRatio is (basically) constant. I guess we'll have to either change or be non-conformant. > > > > Actually what I really think we should do is also change the > > > window.devicePixelRatio for pinch zoom. Combined with the suggestions for > > > canvas, that would allow (as Rik pointed out on IRC) for high-quality > > > canvas all the way zoomed in, and for cheap canvases when zoomed out > > I believe pinch zoom should not change devicePixelRatio. It would be nice > if there was a standard way to determine pinch zoom though and if the > canvas could automatically resize. > > Pinch-zoom is hard because we don't want to trigger reflows or other > expensive behavior on pinch-zoom. I'd leave pinch-zoom out of it for now. Agreed. Dean
