[Webkit-unassigned] [Bug 133180] New: Consider exposing fractional Touch co-ordinates

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=133180

           Summary: Consider exposing fractional Touch co-ordinates
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Event Handling
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rbyers at chromium.org
                CC: benjamin at webkit.org


Various APIs are attempting to move to floating-point co-ordinates (eg. see bug 132895).  Perhaps TouchEvent co-ordinates should also be float/double instead of long?  http://trac.webkit.org/browser/trunk/Source/WebCore/dom/Touch.idl

This may be valuable on high-dpi devices.  Eg. if scrolling is happening in physical pixel units, it should be possible to build JS applications that move things around just as smoothly (as is possible in native iOS apps).  Eg. imagine an app that does a custom pull effect when pulling down when the document is at scroll offset 0.  Today when moving slowly this is noticeably jumpier on retina devices than the buttery smooth browser scrolling you get moving in the other direction.

I'm in the process of switching blink to doubles:
https://code.google.com/p/chromium/issues/detail?id=323935

The TouchEvents community group is also discussing this:
http://lists.w3.org/Archives/Public/public-touchevents/2014May/0006.html

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