[Webkit-unassigned] [Bug 93475] New: Floored and truncated rounded confused

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93475

           Summary: Floored and truncated rounded confused
           Product: WebKit
           Version: 420+
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: allan.jensen at nokia.com
            Blocks: 23170


The two rounding forms floor and truncate are mixed up in several places in the code, mostly in the subpixel layout code, but also in flooredIntPoint(FloatPoint). For most cases this is not a problem since truncate and floor are identical for positive numbers, they only differ for negative numbers, which are not as nearly as common in the WebCore layout code.

This bug currently only leads to minor pixel differences with subpixel layout enabled, but the fix for bug #23170 depends on it both with and without subpixel layout enabled.

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