2011-05-26 Tom Hudson <tomhudson@google.com>

2011-05-26  Tom Hudson  <tomhudson@google.com>

        Reviewed by Tony Chang.

        Add flags to Chromium ImageDiff to write image comparison metrics on
        stdout.
        https://bugs.webkit.org/show_bug.cgi?id=60569

        * DumpRenderTree/chromium/ImageDiff.cpp:
        (Image::createFromStdin): Fix spelling.
        (maxOf3): New function to do 3-way maximum.
        (getRedComponent): Extract red component from ABGR packed encoding.
        (getGreenComponent): Extract green component from ABGR packed encoding.
        (getBlueComponent): Extract blue component from ABGR packed encoding.
        (weightedPercentageDifferent): Determine % of pixels different in two
        images multiplied by intensity difference of each pixel.
        (printHelp): Document new arguments.
        (compareImages): Parameterize.
        (untestedCompareImages): Parameterize.
        (diffImages): Parameterize; write results on stdout if requested.
        (main): Parse new arguments.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@87367 268f45cc-cd09-0410-ab3c-d52691b4dbfc