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

From: Dirk Pranke <dpranke@chromium.org>
Date: Wed, 7 Aug 2013 17:11:37 -0700
Message-ID: <CAEoffTAvcOAr4+WsVMQDw1XRQRXe7M8qEVKWQQgDvzOrnQh6Ew@mail.gmail.com>
To: www-style@gtalbot.org
Cc: Morten Stenshorne <mstensho@opera.com>, HÃ¥kon Wium Lie <howcome@opera.com>, www-style mailing list <www-style@w3.org>
On Wed, Aug 7, 2013 at 5:06 PM, "Gérard Talbot" <www-style@gtalbot.org>wrote:

>
> Le Mer 7 aoūt 2013 19:54, Dirk Pranke a écrit :
> > On Wed, Aug 7, 2013 at 4:50 PM, "GĆ©rard Talbot"
> > <www-style@gtalbot.org>wrote:
> >
> >>
> >> Le Mer 7 aoÅ«t 2013 18:33, Dirk Pranke a Ć©crit :
> >> > On Wed, Aug 7, 2013 at 3:07 PM, Morten Stenshorne
> >> > <mstensho@opera.com>wrote:
> >> >
> >> >> "GĆĀ©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?
>
>
I think that's correct though I'm not 100% sure and wouldn't want to be
quoted on it without double-checking :).

-- Dirk
Received on Thursday, 8 August 2013 00:12:25 UTC

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