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Re: [whatwg] High-density canvases

From: Dean Jackson <dino@apple.com>
Date: Wed, 11 Sep 2013 05:45:13 +1000
Message-id: <0EDBDB6E-9527-4E98-9791-CD16E2ACC6FD@apple.com>
To: Ian Hickson <ian@hixie.ch>
Cc: Rik Cabanier <cabanier@gmail.com>, Stephen White <senorblanco@chromium.org>, WHAT Working Group <whatwg@whatwg.org>

On 11 Sep 2013, at 5:32 am, Ian Hickson <ian@hixie.ch> wrote:

> On Wed, 11 Sep 2013, Dean Jackson wrote:
>> On 11 Sep 2013, at 12:14 am, Stephen White <senorblanco@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 weve 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.

I fear this will break existing content. I dont think wed ever want to change the behaviour.


> 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.
Received on Tuesday, 10 September 2013 19:46:17 UTC

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