[webkit-dev] Increasing the number of cross-platform/port expected results

Tor Arne Vestbø tor.arne.vestbo at nokia.com
Tue Feb 23 08:21:42 PST 2010

On 23/2/10 17:02 , Simon Fraser wrote:
> On Feb 23, 2010, at 5:00 AM, Tor Arne Vestbø wrote:
>> Hey all,
>> A reoccurring problem when trying to maintain layout-test results
>> is differences in font and theme metrics for tests that dump the
>> render tree. Often a test does not actually test font
>> loading/rendering or theming, but has a piece of text or an input
>> element somewhere in the test which causes the metrics in the
>> render tree to be different, and hence the test failing.
> I think the correct longterm solution to this problem is to use
> reftests. A reftest consists of two files; the test file, and a
> "reference" file that should give the same on-screen rendering. When
> the test is run, the browser loads both files, takes snapshots, and
> does a pixel comparison. Thus font differences between platforms
> become less of an issue.

You mean for example that the reference file of a css-border test that 
has some header-text describing the test would contain the same 
header-text but then a image to represent the reference of the css-part?

tor arne

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