[Bug 1853937] New: Inconsistent rendering of ti, tt ligatures

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bugzilla＠redhat.com

Sunday, 5 July 2020 Sun, 5 Jul '20

2:42 p.m.

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Bug ID: 1853937 Summary: Inconsistent rendering of ti, tt ligatures Product: Fedora Version: 32 Status: NEW Component: lato-fonts Assignee: pikachu.2014(a)gmail.com Reporter: james(a)ettle.org.uk QA Contact: extras-qa(a)fedoraproject.org CC: fonts-bugs(a)lists.fedoraproject.org, pikachu.2014(a)gmail.com, piotr1212(a)gmail.com Target Milestone: --- Classification: Fedora Created attachment 1699956 --> https://bugzilla.redhat.com/attachment.cgi?id=1699956&action=edit Sample renderings The horizontal 't-crossing' strokes of the ti and tt ligatures are rendered slightly below the x-height, in a manner that is more- or less-visible depending on font size. It's most visible at 11pt. Attached are samples rendered with RGB subpixel anti-aliasing, slight hinting. The issue is visible in the 8, 11 and 14pt samples. lato-fonts-2.015-9.fc32.noarch freetype-2.10.1-2.fc32.x86_64 -- You are receiving this mail because: You are on the CC list for the bug.

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Monday, 21 September Mon, 21 Sep

8:50 a.m.

New subject: [Bug 1853937] Inconsistent rendering of ti, tt ligatures

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Alexei Podtelezhnikov <apodtele(a)gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |apodtele(a)gmail.com --- Comment #1 from Alexei Podtelezhnikov <apodtele(a)gmail.com> --- For completeness sake, please add add "f" and "t" to your images. -- You are receiving this mail because: You are on the CC list for the bug.

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9:43 a.m.

New subject: [Bug 1853937] Inconsistent rendering of ti, tt ligatures

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 James <james(a)ettle.org.uk> changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment|0 |1 #1699956 is| | obsolete| | --- Comment #2 from James <james(a)ettle.org.uk> --- Created attachment 1715542 --> https://bugzilla.redhat.com/attachment.cgi?id=1715542&action=edit Sample renderings Updated as requested -- You are receiving this mail because: You are on the CC list for the bug.

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9:47 a.m.

New subject: [Bug 1853937] Inconsistent rendering of ti, tt ligatures

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #3 from James <james(a)ettle.org.uk> --- (In reply to James from comment #2)

...

Created attachment 1715542 [details] Sample renderings Updated as requested

Hold on, ignore those, I had the ligatures turned off... -- You are receiving this mail because: You are on the CC list for the bug.

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9:53 a.m.

New subject: [Bug 1853937] Inconsistent rendering of ti, tt ligatures

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 James <james(a)ettle.org.uk> changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment|0 |1 #1715542 is| | obsolete| | --- Comment #4 from James <james(a)ettle.org.uk> --- Created attachment 1715546 --> https://bugzilla.redhat.com/attachment.cgi?id=1715546&action=edit sample renderings updated per request ...this time with the ligatures. -- You are receiving this mail because: You are on the CC list for the bug.

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10:50 a.m.

New subject: [Bug 1853937] Inconsistent rendering of ti, tt ligatures

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #5 from Alexei Podtelezhnikov <apodtele(a)gmail.com> --- Curiously, the ligatures outside of Unicode are the ones loaded without hinting. Which program is this? I do not see the issue with ftview from freetype-demos. -- You are receiving this mail because: You are on the CC list for the bug.

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11:08 a.m.

New subject: [Bug 1853937] Inconsistent rendering of ti, tt ligatures

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #6 from James <james(a)ettle.org.uk> --- The samples are all screenshots from the sample area a Gtk3 font selection box -- such as you can get e.g. in Gedit. -- You are receiving this mail because: You are on the CC list for the bug.

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12:13 p.m.

New subject: [Bug 1853937] Inconsistent rendering of ti, tt ligatures

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #7 from Alexei Podtelezhnikov <apodtele(a)gmail.com> --- The glyphs are hinted in the font. It must be Pango which loads them unhinted (FT_LOAD_NO_HINTING). Please reassign to Pango. -- You are receiving this mail because: You are on the CC list for the bug.

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2:05 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

bugzilla＠redhat.com

2:06 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #8 from James <james(a)ettle.org.uk> --- (In reply to Alexei Podtelezhnikov from comment #7)

...

The glyphs are hinted in the font. It must be Pango which loads them unhinted (FT_LOAD_NO_HINTING). Please reassign to Pango.

Done. I've changed the title -- does this accurately summarise the situation? -- You are receiving this mail because: You are on the CC list for the bug.

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2:06 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 James <james(a)ettle.org.uk> changed: What |Removed |Added ---------------------------------------------------------------------------- Comment|0 |updated --- Comment #0 has been edited --- Created attachment 1699956 --> https://bugzilla.redhat.com/attachment.cgi?id=1699956&action=edit Sample renderings The horizontal 't-crossing' strokes of the ti and tt ligatures are rendered slightly below the x-height, in a manner that is more- or less-visible depending on font size. It's most visible at 11pt. Attached are samples rendered with RGB subpixel anti-aliasing, slight hinting. The issue is visible in the 8, 11 and 14pt samples. lato-fonts-2.015-9.fc32.noarch freetype-2.10.1-2.fc32.x86_64 -- You are receiving this mail because: You are on the CC list for the bug.

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9:52 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Peng Wu <pwu(a)redhat.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Doc Type|--- |If docs needed, set a value --- Comment #9 from Peng Wu <pwu(a)redhat.com> --- Could you provide the expected result? And how do you produce the sample image? -- You are receiving this mail because: You are on the CC list for the bug.

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Tuesday, 22 September Tue, 22 Sep

8:07 a.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #10 from James <james(a)ettle.org.uk> --- Created attachment 1715700 --> https://bugzilla.redhat.com/attachment.cgi?id=1715700&action=edit My fonts.conf -- You are receiving this mail because: You are on the CC list for the bug.

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8:13 a.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #11 from James <james(a)ettle.org.uk> --- Created attachment 1715702 --> https://bugzilla.redhat.com/attachment.cgi?id=1715702&action=edit Large point-size expected result (generated in Inkscape) -- You are receiving this mail because: You are on the CC list for the bug.

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8:13 a.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 James <james(a)ettle.org.uk> changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment|sample renderings updated |Sample renderings in Gtk3 #1715546|per request |font chooser, at 8, 9, 10, description| |11 and 14 pt -- You are receiving this mail because: You are on the CC list for the bug.

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8:15 a.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #12 from James <james(a)ettle.org.uk> --- (In reply to Peng Wu from comment #9)

...

Could you provide the expected result? And how do you produce the sample image?

The sample image was produced by taking screenshots from a Gtk3 font chooser. fonts.conf attached. Using RGB subpixel anti-aliasing with slight hinting. The expected result is what's seen in the 9pt and 10pt samples: the horizontal stroke of the ti and tt ligatures lines up with that of a single t. Note in the 8pt, 11pt and 14pt samples the horizonal stroke on the ligature is a pixel or so below that on the single t. I've also attached a rendering of "t ti tt" at large point-size rendered in Inkscape, just to confirm that the glyphs' horizontal strokes do align geometrically. -- You are receiving this mail because: You are on the CC list for the bug.

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Thursday, 8 October Thu, 8 Oct

10:10 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Peng Wu <pwu(a)redhat.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Flags| |needinfo?(james(a)ettle.org.u | |k) --- Comment #13 from Peng Wu <pwu(a)redhat.com> --- Could you use pango-view to produce the actual result? And use ftview to produce the expected result for comparison. -- You are receiving this mail because: You are on the CC list for the bug.

bugzilla＠redhat.com

11:27 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #14 from Akira TAGOH <tagoh(a)redhat.com> --- easy to reproduce with this: pango-view --markup -t "8pt t ti fi tt^M9pt t ti fi tt^M10pt t ti fi tt^M11pt t ti fi tt^M14pt t ti fi tt" and ftview -e unic -m "t ti fi tt" -k5 14 /usr/share/fonts/lato/Lato-Regular.ttf -- You are receiving this mail because: You are on the CC list for the bug.

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11:58 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #15 from Akira TAGOH <tagoh(a)redhat.com> --- Created attachment 1720101 --> https://bugzilla.redhat.com/attachment.cgi?id=1720101&action=edit Actual result with the helping line This would demonstorate the issue -- You are receiving this mail because: You are on the CC list for the bug.

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Sunday, 11 October Sun, 11 Oct

1:21 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 James <james(a)ettle.org.uk> changed: What |Removed |Added ---------------------------------------------------------------------------- Flags|needinfo?(james(a)ettle.org.u | |k) | --- Comment #16 from James <james(a)ettle.org.uk> --- Created attachment 1720732 --> https://bugzilla.redhat.com/attachment.cgi?id=1720732&action=edit Rendering from pango-view --markup Provided in part fulfilment of the NEEDINFO. This is with pango-1.47.0-1.fc33.x86_64. -- You are receiving this mail because: You are on the CC list for the bug.

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1:25 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #17 from James <james(a)ettle.org.uk> --- (In reply to Akira TAGOH from comment #14)

...

ftview -e unic -m "t ti fi tt" -k5 14 /usr/share/fonts/lato/Lato-Regular.ttf

When I tried this, it didn't use the ligatures -- not sure how to make them show up as some of these are non-Unicode ligatures. -- You are receiving this mail because: You are on the CC list for the bug.

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Monday, 12 October Mon, 12 Oct

1:30 a.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #18 from Akira TAGOH <tagoh(a)redhat.com> --- Ah, you're right. I'm not sure even if ftview is capable to render the ligatures, but how about this then: hb-view --text "t ti fi tt" /usr/share/fonts/lato/Lato-Regular.ttf We can confirm it works on harfbuzz layer. -- You are receiving this mail because: You are on the CC list for the bug.

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8:27 a.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #19 from James <james(a)ettle.org.uk> --- (In reply to Akira TAGOH from comment #18)

...

Ah, you're right. I'm not sure even if ftview is capable to render the ligatures, but how about this then: hb-view --text "t ti fi tt" /usr/share/fonts/lato/Lato-Regular.ttf We can confirm it works on harfbuzz layer.

The renderings from hb-view looks OK to me -- it's difficult to tell because it seems to be using different font size units to pango-view, and I'm not sure it's applying the same anti-aliasing and hinting settings. -- You are receiving this mail because: You are on the CC list for the bug.

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Wednesday, 14 October Wed, 14 Oct

10:48 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #20 from Peng Wu <pwu(a)redhat.com> --- Right, I think we need to use similar settings in hb-view for comparison. -- You are receiving this mail because: You are on the CC list for the bug.

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Tuesday, 10 November Tue, 10 Nov

8:29 p.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #21 from Peng Wu <pwu(a)redhat.com> --- It seems this bug is triggered by different hinting style. I tried with different hinting style like none/medium/full, the ligatures aligned correctly. But for hinting style with auto/slight, this bug happens. Here are the testing command: $ pango-view --text="t ti fi tt" --hinting=full --font="Lato 8" -- You are receiving this mail because: You are on the CC list for the bug.

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Thursday, 12 November Thu, 12 Nov

9:09 a.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #22 from Alexei Podtelezhnikov <apodtele(a)gmail.com> --- Created attachment 1728793 --> https://bugzilla.redhat.com/attachment.cgi?id=1728793&action=edit ftview screenshot (In reply to Peng Wu from comment #21)

...

But for hinting style with auto/slight, this bug happens.

I can confirm that FreeType autohinter ignores non-Unicode ligatures, see attached. Please change the component back to FreeType. -- You are receiving this mail because: You are on the CC list for the bug.

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9:38 a.m.

New subject: [Bug 1853937] ti, tt ligatures (of at least Lato font) loaded without hinting

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 James <james(a)ettle.org.uk> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |ajax(a)redhat.com, | |kevin(a)tigcc.ticalc.org, | |mkasik(a)redhat.com Component|pango |freetype -- You are receiving this mail because: You are on the CC list for the bug.

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9:38 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 James <james(a)ettle.org.uk> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|ti, tt ligatures (of at |Auto-hinter ignores |least Lato font) loaded |non-unicode ligatures (e.g. |without hinting |Lato ti, tt) -- You are receiving this mail because: You are on the CC list for the bug.

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Friday, 13 November Fri, 13 Nov

8:09 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #23 from Alexei Podtelezhnikov <apodtele(a)gmail.com> --- Fedora comes with FreeType without HarfBuzz [https://savannah.nongnu.org/bugs/?59452]. So there is a fix but it is a circular dependency. -- You are receiving this mail because: You are on the CC list for the bug.

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8:22 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #24 from James <james(a)ettle.org.uk> --- (In reply to Alexei Podtelezhnikov from comment #23)

...

Fedora comes with FreeType without HarfBuzz [https://savannah.nongnu.org/bugs/?59452]. So there is a fix but it is a circular dependency.

Understood -- I just rebuild the freetype RPM locally with harfbuzz enabled in the spec and the ligatures look correct. -- You are receiving this mail because: You are on the CC list for the bug.

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12:35 p.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #25 from James <james(a)ettle.org.uk> --- Couldn't this be worked around by creating a package like freetype-nonharfbuzz built without HarfBuzz, use that purely as a builddep for the harfbuzz package in the Fedora buildsystem, and then build a freetype package depending on harfbuzz? -- You are receiving this mail because: You are on the CC list for the bug.

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Monday, 16 November Mon, 16 Nov

6:01 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #26 from Akira TAGOH <tagoh(a)redhat.com> --- We may need some tweaks in the spec file to enable bootstrap. https://docs.fedoraproject.org/en-US/packaging-guidelines/#bootstrapping -- You are receiving this mail because: You are on the CC list for the bug.

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Friday, 20 November Fri, 20 Nov

12:21 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Jens Petersen <petersen(a)redhat.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Severity|unspecified |medium -- You are receiving this mail because: You are on the CC list for the bug.

bugzilla＠redhat.com

5:35 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #27 from Akira TAGOH <tagoh(a)redhat.com> --- Created a testing package with harfbuzz enabled. https://copr.fedorainfracloud.org/coprs/tagoh/freetype-harfbuzz/ Indeed, the result of ftview looks good to me. -- You are receiving this mail because: You are on the CC list for the bug.

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5:50 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #28 from James <james(a)ettle.org.uk> --- I confirm your SRPM builds for me on Fedora 33 and works as expected. -- You are receiving this mail because: You are on the CC list for the bug.

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Thursday, 10 December Thu, 10 Dec

11:57 p.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Jens Petersen <petersen(a)redhat.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Assignee|pikachu.2014(a)gmail.com |mkasik(a)redhat.com -- You are receiving this mail because: You are on the CC list for the bug.

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Friday, 11 December Fri, 11 Dec

3:16 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Akira TAGOH <tagoh(a)redhat.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Depends On| |1906714 Referenced Bugs: https://bugzilla.redhat.com/show_bug.cgi?id=1906714 [Bug 1906714] Enable OpenType related features with HarfBuzz -- You are receiving this mail because: You are on the CC list for the bug.

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Tuesday, 26 January Tue, 26 Jan

2:45 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Akira TAGOH <tagoh(a)redhat.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Version|32 |rawhide --- Comment #29 from Akira TAGOH <tagoh(a)redhat.com> --- Moving this to rawhide. we are planning to fix this there. -- You are receiving this mail because: You are on the CC list for the bug.

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Friday, 5 February Fri, 5 Feb

5:49 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Bug 1853937 depends on bug 1906714, which changed state. Bug 1906714 Summary: Enable OpenType related features with HarfBuzz https://bugzilla.redhat.com/show_bug.cgi?id=1906714 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |CLOSED Resolution|--- |RAWHIDE -- You are receiving this mail because: You are on the CC list for the bug.

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7:57 a.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Marek Kašík <mkasik(a)redhat.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Fixed In Version| |freetype-2.10.4-3.fc34 --- Comment #30 from Marek Kašík <mkasik(a)redhat.com> --- I've verified that the new freetype with harfbuzz support enabled fixes the issue. I've used the pango-view command from the comment #14 for that. I'm closing this. Thank you all for your help. -- You are receiving this mail because: You are on the CC list for the bug.

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Tuesday, 9 March Tue, 9 Mar

7:16 p.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 --- Comment #32 from James <james(a)ettle.org.uk> --- Seems fixed on my F34 box running freetype-2.10.4-3.fc34.x86_64, harfbuzz-2.7.4-3.fc34.x86_64 -- OK to close as fixed? -- You are receiving this mail because: You are on the CC list for the bug.

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Friday, 1 October Fri, 1 Oct

12:39 p.m.

New subject: [Bug 1853937] Auto-hinter ignores non-unicode ligatures (e.g. Lato ti, tt)

https://bugzilla.redhat.com/show_bug.cgi?id=1853937 Mohamed El Morabity <pikachu.2014(a)gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |CURRENTRELEASE Status|NEW |CLOSED Last Closed| |2021-10-01 17:39:11 -- You are receiving this mail because: You are on the CC list for the bug. https://bugzilla.redhat.com/show_bug.cgi?id=1853937

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[Bug 1853937] New: Inconsistent rendering of ti, tt ligatures