[Webkit-unassigned] [Bug 145929] New: Animating border-radius is blocky on iPad

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=145929

            Bug ID: 145929
           Summary: Animating border-radius is blocky on iPad
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: iOS
                OS: iOS 8.2
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: julienq at apple.com
                CC: webkit-bug-importer at group.apple.com

Created attachment 254799
  --> https://bugs.webkit.org/attachment.cgi?id=254799&action=review
CSS and SVG circles animating side-by-side; CSS looks blocky on iPad.

A simple way to represent a circle with CSS is to have a <div> element with the same width and height (effectively square) and set its border-radius to half its size. Animating the scale of the element at small sizes on iPad however results in a blocky appearance, where the circle looks more like a square with rounder corners than a circle. Safari and Chrome on OS X look OK (but Firefox looks terrible.)

Included is a test file that shows the problem, with an SVG circle on the right for comparison (the animation of the SVG circle could also use some improvement on iPad when compared to OS X, but it’s definitely better than the CSS one.)

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