[webkit-dev] Rounding issues on different platforms

Martin Robinson mrobinson at webkit.org
Tue Jun 7 09:39:04 PDT 2011

On Tue, Jun 7, 2011 at 9:33 AM, Evan Martin <evan at chromium.org> wrote:
> On Tue, Jun 7, 2011 at 5:34 AM, Zoltan Herczeg <zherczeg at inf.u-szeged.hu> wrote:
>> If you maintain some bots, and you saw rounding issues which makes 1px
>> difference on let's say 32 and 64 bit environments for several layout
>> tests, you may interested in this bug:
>> https://bugs.webkit.org/show_bug.cgi?id=62204
> Years ago someone tracked down a layout test failure to optimizations
> on a particular file in WebKit.
>  http://code.google.com/p/chromium/issues/detail?id=8475
> "The extra precision is causing a problem in:
> third_party/WebKit/WebCore/platform/graphics/Color.cpp
> which can be "fixed" by compiling with -ffloat-store.  "
> However, that was long enough ago the error may no longer exist in that file.

I believe I may have found at least one source of rounding issues [1],
but I simply have not had time to look into it further.

[1] https://bugs.webkit.org/show_bug.cgi?id=54474#c18


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