[Webkit-unassigned] [Bug 42706] New: -webkit-transform leaves seams between elements on some platforms

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42706

           Summary: -webkit-transform leaves seams between elements on
                    some platforms
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: thakis at chromium.org


Created an attachment (id=62123)
 --> (https://bugs.webkit.org/attachment.cgi?id=62123)
repro

If you zoom in on maps.google.com in Safari or Chromium/Mac, you see white seems between the tiles while the zoom animation is running.

There are several causes of this. One is that if a page has adjacent images in a container and applies a weird scale factor (like 1.17) to the image's container, seems appear.

See the attached file. On chrome/windows, this is rendered without seams (probably due to skia rendering only at integer coordinates?). In Safari and Chrome/mac, white lines are visible between the images.

OpenGL specs that triangles need to be transformed so that rasterizing adjacent triangles doesn't produce seams. Maybe the css transforms spec needs to spec that too?

( This is part of http://crbug.com/46118 )

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