Kerning not working for kern-only, no GPOS webfont
Reported by
and...@mamchur.net,
Jun 19 2016
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Issue descriptionUserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36 Example URL: http://mamchur.net/kerning/index.html Steps to reproduce the problem: 1. Define custom font 2. Assign new font-family to HTML/SVG element or render text into canvas element 3. Observe text rendering issue What is the expected behavior? Text kerning should be applied between font glyphs What went wrong? Kerning values are ignored, glyphs x-advance is used only. Does it occur on multiple sites: N/A Is it a problem with a plugin? No Did this work before? N/A Does this work in other browsers? Yes Chrome version: 51.0.2704.103 Channel: stable OS Version: OS X 10.11.5 Flash Version: Shockwave Flash 22.0 r0
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Jun 20 2016
Checked & confirmed - attached screenshot fully describes issue. FF has correct text rendering - all HTML/SVG & Canvas rendering support kerning. Chrome ignores glyphs kerning. Thanks for fast response, Andrii Mamchur
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Jun 20 2016
Thank you for providing more feedback. Adding requester "nyerramilli@chromium.org" for another review and adding "Needs-Review" label for tracking. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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Jun 21 2016
thanks for the confirmation. This is non-regression, issue existing from M30 build #30.0.1549.0 Issue specific to Win7, Mac OS X only; working fine in Ubuntu 14.04
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Jun 24 2016
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Jun 29 2016
Sakamoto-san, Can you take a quick look on this bug? I confirmed that this works correctly on Linux. Do you know any platform dependent code path that could cause this problem?
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Jun 30 2016
Hmm I have no idea. +font experts - does anyone have any clue?
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Jun 30 2016
Dumping BellaDonna.ttf using fonttools [1]: $ ttx BellaDonna.ttf Dumping "BellaDonna.ttf" to "BellaDonna#2.ttx"... Dumping 'GlyphOrder' table... Dumping 'head' table... Dumping 'hhea' table... Dumping 'maxp' table... Dumping 'OS/2' table... Dumping 'hmtx' table... Dumping 'LTSH' table... Dumping 'VDMX' table... Dumping 'hdmx' table... Dumping 'cmap' table... Dumping 'fpgm' table... Dumping 'prep' table... Dumping 'cvt ' table... Dumping 'loca' table... Dumping 'glyf' table... Dumping 'kern' table... Dumping 'name' table... Dumping 'post' table... It shows that BellaDonna.ttf does not have GPOS table, but only a kern table. Looks like we don't support retrieving kerning information on Windows and Mac through the kern table, but only through GPOS. I believe, GPOS is the more common and recommended way to specify kerning information, but CC'ing Behdad for comment here. You can fix your custom font by generating a GPOS table for example using fontforge. Attaching a copy of BellaDonna.ttf in which this works at least for the SVG and HTML examples. I'll mark this as WontFix for now, for reasons of rare cases of fonts that have kerning information only in the kern table, unless Behdad thinks this should be fixed. [1] https://github.com/behdad/fonttools
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Jun 30 2016
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Jun 30 2016
It doesn't make sense to me that this work on Linux but not other platforms. Skia must be the culprit. We rely on the get_h_kerning() implementation that calls Skia to get that. WONTFIX sounds about right to me; we'll eventually implement the kern table in HarfBuzz directly.
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Jul 1 2016
Agree that the reason is calling back into Skia for these values and not getting them on Windows and Mac. If we can implement it in HarfBuzz through support for the kern table directly, I'll reopen this and lower the priority to 3. andrii, thank you for the report and test case.
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Jul 1 2016
Chromium Team, thank you for investigating this issue.
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Jul 4 2016
Moving this nonessential bug to the next milestone. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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Jul 4 2017
This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue. Sorry for the inconvenience if the bug really should have been left as Available. If you change it back, also remove the "Hotlist-Recharge-Cold" label. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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Jul 5 2017
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Nov 14 2017
I'm fixing this in HarfBuzz upstream; very soon.
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Nov 14
This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue. Sorry for the inconvenience if the bug really should have been left as Available. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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Nov 14
Behdad, any updates?
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Nov 14
This has been fixed long ago. |
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Comment 1 by nyerramilli@chromium.org
, Jun 20 2016Labels: Needs-Feedback
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