In the future?
On Mar 4, 2011, at 8:51 AM, Oliver Hunt <oli...@apple.com> wrote: > For reference desktop webkit implementations will automatically increase the > canvas backing store resolution as the device:css pixel ratio increases. > > --Oliver > > On Mar 4, 2011, at 1:44 AM, Charles Pritchard wrote: > >> On 3/4/2011 1:35 AM, Kenneth Rohde Christiansen wrote: >>> Hi again, >>> >>>> I'm trying to keep the canvas bitmap at the same pixel resolution as the >>>> device, >>>> otherwise it is blurry. >>> OK, I see. >>> >>>> This, for example, works if the pixel ratio is 2. >>>> <canvas style="width: 100px; height: 100px;" width="200" >>>> height="200"></canvas> >>>> >>>> Yes, when the user has a zoom level set, I'd like to paint to match the >>>> pixel ratio, >>>> so that, a zoomed in user still receives crisp output, instead of blurry >>>> output. >>> -webkit-device-pixel-ratio does not change when the user scaled the >>> content; it is a device value. >>> >>> On old iPhone it is 1.0, on Android it can be 0.5, 1.0 and 1.5 >>> depending on it being a low, medium (160) or high dpi (240) device. On >>> the iPhone 4 and the new iPod Touch it is 2.0. >>> >>> On Android devices, with for instance, a device-pixel-ratio of 1.5, >>> you can disable the upscaling by adding target-densitydpi=device-dpi >>> to the viewport meta tag. >>> >>> What you can do is to disable user scaling (add user-scaling=no to the >>> viewport meta tag) and then handle zooming in your app using the touch >>> events. This only works on mobile devices though. >> >> I haven't debugged with enough tablet devices, such as the color kindle, to >> know how many webkit distros it works with. >> What should I do about user zoom on the desktop (and possibly, the kindle) ? >> >> Drawing in high res, just-in-case, makes for a poorer experience for users >> at a 1.0 ratio, >> and asking users to slide a "sharpen" slider is a little awkward. >> >> Mozilla, in their implementation, has setup device-pixel-ratio to scale when >> the user scales content; >> they directly expose window css pixel ratio value to trusted scripts, but >> not to web content; requiring >> web content to use css device-pixel-ratio. >> >> Microsoft has exposed the values through window.screen. >> >> >> >> -Charles >> _______________________________________________ >> webkit-dev mailing list >> webkit-dev@lists.webkit.org >> http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev > _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev