[whatwg] High-density canvases
ian at hixie.ch
Thu Sep 12 10:42:50 PDT 2013
On Thu, 12 Sep 2013, Robert O'Callahan wrote:
> On Wed, Sep 11, 2013 at 11:24 AM, Ian Hickson <ian at hixie.ch> wrote:
> > On Wed, 11 Sep 2013, Robert O'Callahan wrote:
> > > 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.
> > Unless I'm missing something fundamental, changing the pixel density
> > doesn't cause a layout, it's changing the width that causes a layout.
> Changing pixel density does cause a layout in Gecko. For example we
> round CSS border widths to a whole number of device pixels. (This
> ensures that when page zoom is applied, all borders with the same
> specified width are rendered with the same visual width.) On some
> platforms (Windows), changing pixel density affects text hinting which
> affects text layout.
So how do you do pinch-zoom under the hood on mobile devices?
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
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