[Webkit-unassigned] [Bug 103525] New: Handling of png decoded rows can be improved.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103525

           Summary: Handling of png decoded rows can be improved.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Enhancement
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: a.obzhirov at samsung.com


I've made few optimizations to handle decoded rows after pnglib:
1) Replace divides with shifts for premultiplied alpha calculation
2) Do early exit for non trivial alpha checking.
3) Remove few branch statements from the loop.
As result about 10-20% speed improvement for PNG images decoding time.

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