- From: Gérard Talbot <www-style@gtalbot.org>
- Date: Wed, 7 Aug 2013 20:06:59 -0400
- 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 aoÅ«t 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 -- CSS 2.1 Test suite RC6, March 23rd 2011 http://test.csswg.org/suites/css2.1/20110323/html4/toc.html Contributions to CSS 2.1 test suite http://www.gtalbot.org/BrowserBugsSection/css21testsuite/ Web authors' contributions to CSS 2.1 test suite http://www.gtalbot.org/BrowserBugsSection/css21testsuite/web-authors-contributions-css21-testsuite.html
Received on Thursday, 8 August 2013 00:07:33 UTC