[Webkit-unassigned] [Bug 148422] New: subpixel positioned iframe's repaint area calculation problem

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Aug 25 01:27:06 PDT 2015


            Bug ID: 148422
           Summary: subpixel positioned iframe's repaint area calculation
    Classification: Unclassified
           Product: WebKit
           Version: Safari 8
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hur.ims at navercorp.com

Created attachment 259828
  --> https://bugs.webkit.org/attachment.cgi?id=259828&action=review
screen capture of bug

I've been digging a plugin rendering problem of Win port, which is not-rendering the bottom or right edge of flash contents in some situation.
After some investigation, I got to suspect the subpixel positioning of widgets and found a related layout test, hidpi-content-inside-iframe-leaves-trails.html.
I modified this test little bit to reflect my circumstances(iframe left = 0.5, foo div left = 0.5), and it shows a problematic result, the repaint area is not covering the whole area of the changed element.

I've tested and seen this on Safari8, Win and WinCairo port's WinLauncher.

Can anybody look into this?

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