[Webkit-unassigned] [Bug 42390] New: Multi-layer backgrounds repaint (in low quality) every 0.5 seconds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42390

           Summary: Multi-layer backgrounds repaint (in low quality) every
                    0.5 seconds
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: andreas.kling at nokia.com


ImageQualityController (in RenderBoxModelObject.cpp) is broken for multi-layer backgrounds.
Since it only remembers the RenderBoxModelObject* and what IntSize the tile was, an element with multiple layers will get caught by the "animated resize" heuristic and get stuck in a loop where it's repainted in low quality every 0.5 seconds.

This can be observed with LayoutTests/fast/backgrounds/size/contain-and-cover.html

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.