[whatwg] High-density canvases

[Ian Hickson]

On Wed, 11 Sep 2013, Dean Jackson wrote:
> On 11 Sep 2013, at 5:32 am, Ian Hickson <ian at hixie.ch> wrote:
> > On Wed, 11 Sep 2013, Dean Jackson wrote:
> >> On 11 Sep 2013, at 12:14 am, Stephen White <senorblanco at chromium.org> 
> >> wrote:
> >>> 
> >>> now that some browsers are including browser zoom (page zoom) in 
> >>> window.devicePixelRatio
> >> 
> >> Ouch. Who is doing this and why?
> > 
> > Why ouch?
> 
> Because we’ve always operated under the assumption that devicePixelRatio 
> is the mapping from CSS px to device pixels at 1:1 scale/zoom, and that 
> it is constant for a particular display. The only change content would 
> see is if the window is dragged to/from a high resolution screen.
> 
> There are other ways to query the page zoom.

That seems broken... why would you want to hide the page zoom?


> I fear this will break existing content. I don’t think we’d ever want to 
> change the behaviour.

I guess we'll just have to treat devicePixelRatio as legacy and introduce 
a new value that's the real device:pixel ratio, then.

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'