[Webkit-unassigned] [Bug 40159] New: [Qt] Decode images in a separate thread to improve UI responsiveness

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=40159

           Summary: [Qt] Decode images in a separate thread to improve UI
                    responsiveness
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kevin.simons at nokia.com
                CC: hausmann at webkit.org


Because QtWebKit current decodes images in the main thread, the UI performance suffers while images are being decoded. This is particularly noticeable when examining scrolling performance of image-heavy websites.

Additional details:
- Decoding images in a separate thread should work with the tile-based rendering in QtWebKit. Once images are decoded, tiles to which they belong should be updated.
- It is sufficient to only decode images for which the width/height attributes or CSS style properties are specified in a separate thread if that simplifies layout process.

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