- From: Charles Pritchard <chuck@jumis.com>
- Date: Tue, 20 Mar 2012 12:30:37 -0700
On 3/20/2012 10:53 AM, Tab Atkins Jr. wrote: > Given that the modern iPhones (and I suspect the iPad 3, though I > haven't tested it yet) aren't exposing their high-res backing stores > (they give back ImageData with CSS px resolution), it seems likely > that the original goal of get/putImageData to seamlessly adapt has > failed. So, I support adding an alternate API that explicitly returns > a high-res store. If people fuck*that* up, then we're just screwed. IE exposes CSS px resolution via window.screen; mobile exposes via devicePixelRatio, webkit exposes accidentally through innerHeight and outerHeight and Mozilla through CSS queries on device-pixel-ratio. I tried to get this mess fixed, but I got a lot of push back from Mozilla. WebKit developers agreed that the MS solution would be OK: http://msdn.microsoft.com/en-us/library/ms535868(v=vs.85).aspx <http://msdn.microsoft.com/en-us/library/ms535868%28v=vs.85%29.aspx> Anne agreed to add it to CSSOM back when he was editing it, once there was a second implementation. I've got two hacks to get pixel resolution over here: http://www.jumis.com/cme-button.html#abc6 I didn't add the Mozilla one yet. I strongly suggest we just fix the problem by updating window.screen so us developers can manually manage the CSS width vs independent width. I've been doing this forever, it works fine [I update on resize events if the res has changed]: <canvas style="width: 50px; height: 50px;" width="100" height="100" /> We already went through this discussion on WHATWG. I didn't like how it went back then. Now that we're revisiting it, maybe we can just follow MS. On desktop, the res changes with browser zoom. -Charles
Received on Tuesday, 20 March 2012 12:30:37 UTC