[Webkit-unassigned] [Bug 75506] New: Improve touch handling performance by reusing the hitTest result

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75506

           Summary: Improve touch handling performance by reusing the
                    hitTest result
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Event Handling
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: qinmin at chromium.org


Currently we are doing a hit test for every touch events, this is unnecessary.
For TouchRelease and TouchMove events, the touchTarget is always the same as the TouchPressed event.
Even worse, performing a hitTest on a TouchMove could give us a new containing frame as finger moves. This could totally mess up the touch handling.
One good example for this is scrolling http://www.nme.com/reviews/young-knives/11931 on android browser with galaxy nexus. Touch the first paragraph and start scrolling upwards. When finger reaches the video area, flickering will appear.

This change reuses the hit test results from TouchPressed for further touch events.

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