[Webkit-unassigned] [Bug 90169] New: Effective Image size deviates from width and height attributes with sub-pixel layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90169

           Summary: Effective Image size deviates from width and height
                    attributes with sub-pixel layout
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dominik.rottsches at intel.com
                CC: tmpsantos at gmail.com, eae at chromium.org,
                    leviw at chromium.org
            Blocks: 60318,89458


Created an attachment (id=149937)
 --> (https://bugs.webkit.org/attachment.cgi?id=149937&action=review)
014-wdiff.html failure

When enabling sub-pixel layout, the DRT values for RenderImages are deviating from the specified width and height.
This shows for example in fast/block/basic/014-wdiff.html (diff attached).

I don't see a reason why the image size should be changed from what's specified as height (21) to 22 pixels height and then moved one pixel up (-1).

I'm investigating, but if this is a known issue, Levi & Emil - please let me know.

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