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Re: [css3-multicol] Test with excessively wide column-gaps

From: Gérard Talbot <www-style@gtalbot.org>
Date: Wed, 7 Aug 2013 20:06:59 -0400
Message-ID: <7a3ddc5bb269fe82f6a08867545aef95.squirrel@ed-sh-cp3.entirelydigital.com>
To: "Dirk Pranke" <dpranke@chromium.org>
Cc: "Morten Stenshorne" <mstensho@opera.com>, "HÃ¥kon Wium Lie" <howcome@opera.com>, "www-style mailing list" <www-style@w3.org>

Le Mer 7 août 2013 19:54, Dirk Pranke a écrit :
> On Wed, Aug 7, 2013 at 4:50 PM, "Gérard Talbot"
> <www-style@gtalbot.org>wrote:
>
>>
>> Le Mer 7 aoūt 2013 18:33, Dirk Pranke a écrit :
>> > On Wed, Aug 7, 2013 at 3:07 PM, Morten Stenshorne
>> > <mstensho@opera.com>wrote:
>> >
>> >> "GĆ©rard Talbot" <www-style@gtalbot.org> writes:
>> >>
>> >> > We have hundreds of tests which use Ahem font and correspondent
>> >> reference
>> >> > test files using images. This is the first I hear about what you
>> say.
>> >> So,
>> >> > this is somehow worrisome.
>> >>
>> >> OK, maybe my setup is weird. :)
>> >>
>> >> Can't say I'm too fond of the Ahem font. I try to avoid it when
>> writing
>> >> tests. I guess I've seen too many Ahem tests with expectations that
>> not
>> >> all font engines can live up to (like now). In my pessimistic mind,
>> an
>> >> Ahem rendering can only be compared with another Ahem rendering, and
>> not
>> >> with images, filled squares, etc. I usually end up using
>> (inline-)blocks
>> >> with a background instead, or if I really have to use text, I just
>> use
>> >> the default font, since I don't expect to be able to assume anything
>> >> about how Ahem text is going to be rendered (or even laid out),
>> anyway.
>> >>
>> >> BTW, on the computer I use now (Ubuntu something), Presto displays an
>> >> ugly half pixel wide vertical stripe between the characters in your
>> >> test. There are so many ways to "fail". :)
>> >>
>> >> > Do you have ClearType on or off? Do you use ClearType default,
>> initial
>> >> > setting?
>> >>
>> >> I don't think I've changed anything. I don't have access to that
>> >> computer right now, so I can't tell you more. I was running Windows 7
>> >> with IE10 inside a VirtualBox that runs under Debian. That might be a
>> >> clue, I suppose.
>> >>
>> >> > Are you using a color LCD display?
>> >>
>> >> Yes.
>> >>
>> >> > Is the phenomenon still occuring in all/every ClearType Text Tuner
>> >> > situations?
>> >>
>> >> I could check.
>> >>
>> >> > If you reset all IE10 settings to factory default, is there still a
>> >> half
>> >> > pixel offset affecting test versus reftest ?
>> >>
>> >> I could try that as well.
>> >>
>> >>
>> > As another data point, in Blink (Chromium), we see a large number of
>> test
>> > failures on Mac OS 10.8 when rendering tests containing the Ahem font
>> with
>> > text antialiasing enabled; when I turned off antialiasing, the
>> failures
>> > went away.
>> >
>> > It's possible this is some weirdness in the font definitions for Ahem
>> that
>> > could be corrected.
>>
>> Hmm... I usually create reference files with images (swatch-*.png in
>> /support/ folder) as associated reftest for tests using Ahem font.
>>
>> Could it be that anti-aliasing is affecting Ahem glyphs (or fonts only)
>> in
>> a way that is (or would be) different for adjacent .png images?
>>
>>
> It's possible.
>
> I should clarify that we turn off anti-aliasing only when running tests in
> our test harness, in case that wasn't clear. It is on in the shipping
> browsers.
>
> -- Dirk

Dirk,

-webkit-font-smoothing: auto
is supposed to be "smoothing" text according to system defaults.

So, with -webkit-font-smoothing: auto, anti-aliasing could be ON or OFF. No?

Gérard
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Received on Thursday, 8 August 2013 00:07:33 UTC

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