1650414 - Hindi (devanagari) text is not rendered properly.

Status: VERIFIED FIXED

(Core :: Layout: Text and Fonts, defect)

Description

[A S Alam]

Attachment: Safari_Line-Correct-2.png

During using news website in Hindi (bbc etc, link below), Hindi text is not redenered properly in firefox browser, while Safari shows same website without any issue. Attached screenshot has compare between Firefox and Safari with Yellow highlighted text.

Text:
भारत- नेपाल विवाद में चीनी राजदूत की क्या है भूमिका

Link: https://www.bbc.com/hindi/international-53278461
or https://www.bhaskar.com/national/

Firefox - 78.0.1 (64-bit) -
MacOS 10.15.5 (19F101)

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Comment 1

[A S Alam]

Attachment: Safari -Top-Firefox-Bottom.png

Comment 2

[A S Alam]

Attachment: Safari-left-Firefox-Right.png

Comment 3

[A S Alam]

Attachment: Safari-Left-Firefox-Right.png

Comment 4

[A S Alam]

Attachment: Safari-Top-Correct-Firefox-Bottom-incorrect.png

Comment 5

[BugBot [:suhaib / :marco/ :calixte]]

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 6

[Jonathan Kew [:jfkthame]]

This appears to be a harfbuzz issue rendering the Devanagari Sangam MN font (and maybe other AAT fonts). A workaround is to set gfx.font_rendering.coretext.enabled to true in about:config.

It'd be good to know if this is a recent regression...

Comment 7

[A S Alam]

gfx.font_rendering.coretext.enabled - true - workaround fixed issue with Firefox for me.

Comment 8

[Jonathan Kew [:jfkthame]]

This started with the harfbuzz 2.6.6 update in bug 1631118.

FWIW, the same broken rendering occurs in Chrome if the font Devanagari Sangam MN is used; but they seem to default to Kohinoor Devanagari instead, which doesn't suffer from the problem, so it's less likely to show up.

Comment 9

[A S Alam]

Panjabi (Gurmukhi script)'s rendering is also broken in firefox for Complex text as below.

ਵ੍ਹ
ਵ੍ਰ

Comment 10

[A S Alam]

Attachment: Gurmukhi-Text -Firefox-MacOS-Pages.png

Comment 11

[Jonathan Kew [:jfkthame]]

Filed https://github.com/harfbuzz/harfbuzz/issues/2531.

Comment 12

[Jonathan Kew [:jfkthame]]

(In reply to A S Alam from comment #9)

Panjabi (Gurmukhi script)'s rendering is also broken in firefox for Complex text as below.

ਵ੍ਹ
ਵ੍ਰ

I think this is unrelated; it's a question of what Gurmukhi font is used. With "Gurmukhi MT", these sequences do not combine (in either Firefox or Safari), whereas with "Gurmukhi MN" or "Gurmukhi Sangam MN", they do.

Comment 14

[A S Alam]

(In reply to Jonathan Kew (:jfkthame) from comment #12)

(In reply to A S Alam from comment #9)

Panjabi (Gurmukhi script)'s rendering is also broken in firefox for Complex text as below.

ਵ੍ਹ
ਵ੍ਰ

I think this is unrelated; it's a question of what Gurmukhi font is used. With "Gurmukhi MT", these sequences do not combine (in either Firefox or Safari), whereas with "Gurmukhi MN" or "Gurmukhi Sangam MN", they do.

yes, it worked with Gurmukhi (Sangam) MN on firefox and not related to this then. Default font may need to change for firefox as Safari renders without any change.
Thanks for pointing Jonathan.

Comment 15

[Jonathan Kew [:jfkthame]]

This is fixed upstream in 1e6027e29cd5d900337b23a20886b2a8d81bb2de. Not sure when a new upstream release will appear, but given the badly broken rendering here, I think we should go ahead and cherry-pick the fix, and uplift it to Beta asap.

Comment 16

[Jonathan Kew [:jfkthame]]

Attachment: Bug 1650414 - Cherry-pick commit 1e6027e29cd5d900337b23a20886b2a8d81bb2de from upstream harfbuzz to fix AAT mark anchoring. r=lsalzman

Comment 17

[Jonathan Kew [:jfkthame]]

Comment on attachment 9161529 [details]
Bug 1650414 - Cherry-pick commit 1e6027e29cd5d900337b23a20886b2a8d81bb2de from upstream harfbuzz to fix AAT mark anchoring. r=lsalzman

Beta/Release Uplift Approval Request

• User impact if declined: Garbled rendering of some Apple fonts, e.g. Devanagari
• Is this code covered by automated tests?: No
• Has the fix been verified in Nightly?: Yes
• Needs manual test from QE?: Yes
• If yes, steps to reproduce: Load BBC Hindi site from comment 0, and check rendering of the text (see screenshots)
• List of other uplifts needed: None
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): This code is only used for AAT fonts (macOS) where anchor points are used to place marks; no other fonts can be affected. Upstream fix includes testcase to verify the corrected behavior.
• String changes made/needed:

Comment 18

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/3a2c500bd387
Cherry-pick commit 1e6027e29cd5d900337b23a20886b2a8d81bb2de from upstream harfbuzz to fix AAT mark anchoring. r=lsalzman

Comment 19

[Jonathan Kew [:jfkthame]]

Comment on attachment 9161529 [details]
Bug 1650414 - Cherry-pick commit 1e6027e29cd5d900337b23a20886b2a8d81bb2de from upstream harfbuzz to fix AAT mark anchoring. r=lsalzman

ESR Uplift Approval Request

• If this is not a sec:{high,crit} bug, please state case for ESR consideration: Font shaping bug results in garbled rendering for some macOS fonts, e.g. Devanagari; this is a serious readability issue for affected users.
• User impact if declined: Broken text on some Hindi websites (and potentially others).
• Fix Landed on Version: 80
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): Cherry-picking simple fix from upstream, only relevant to macOS AAT fonts that use anchors to attach mark glyphs -- no effect on other fonts. The upstream fix includes testcase to verify the fix.
• String or UUID changes made by this patch:

Comment 20

[Dorel Luca [:dluca]]

https://hg.mozilla.org/mozilla-central/rev/3a2c500bd387

Comment 21

[Ryan VanderMeulen [:RyanVM]]

Comment on attachment 9161529 [details]
Bug 1650414 - Cherry-pick commit 1e6027e29cd5d900337b23a20886b2a8d81bb2de from upstream harfbuzz to fix AAT mark anchoring. r=lsalzman

Cherry-picks an upstream commit to fix a macOS font rendering bug. Approved for 79.0b5 and 78.1esr.

Comment 22

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/releases/mozilla-esr78/rev/e45931c7c81d

Comment 23

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/releases/mozilla-beta/rev/3dbfd4ed089b

Comment 24

[Simona Badau, Desktop QA, PTO 13-25aug]

I reproduced the initial issue on Firefox 78.0.1 on Mac OS X 10.15.
Verified as fixed in the latest Nightly 80.0a1 (build ID: 20200706215007) and Firefox 78.1.0 esr (used a Treeherder build, Build ID: 20200706213333) on Mac OS X 10.15.

Comment 25

[Simona Badau, Desktop QA, PTO 13-25aug]

Verified as fixed also on the latest Firefox 79 beta 5 on Mac OS X 10.15.