[Bug 1648612] New: bad hinting instructions from bug in ttfautohint

https://bugzilla.redhat.com/show_bug.cgi?id=1648612

            Bug ID: 1648612
           Summary: bad hinting instructions from bug in ttfautohint
           Product: Fedora
           Version: 29
         Component: lohit-telugu-fonts
          Assignee: petersen(a)redhat.com
          Reporter: htl10(a)users.sourceforge.net
        QA Contact: extras-qa(a)fedoraproject.org
                CC: extras-qa(a)fedoraproject.org,
                    fonts-bugs(a)lists.fedoraproject.org,
                    i18n-bugs(a)lists.fedoraproject.org, i(a)cicku.me,
                    petersen(a)redhat.com, psatpute(a)redhat.com,
                    yselkowi(a)redhat.com



Font Validator identifies this to be another font affected by the ttfautohint
bug. The affected glyph ID is 796.

Yes it is quite sh*t - "ftview 200 
/usr/share/fonts/lohit-telugu/Lohit-Telugu.ttf"
, go to glyph id 796, and zoom in and out between 201 ppem and 200 ppem

Version affected:
lohit-telugu-fonts-2.5.5-4.fc29.noarch

+++ This bug was initially created as a clone of Bug #1646687 +++

Description of problem:

This was discussed in freetype-devel for much of early October under the thread
"rendering issues with xpdf (and other viewers)".

upstream patch (this was applied after 1.8.2) - you will need to push this to
all the fonts affected - in particular,
lohit-devanagari-fonts-2.95.4-5.fc29.noarch

commit f18b7c859c92111446ca991743dd709e347d0301 (HEAD -> master, origin/master,
origin/HEAD)
Author: Werner Lemberg <wl(a)gnu.org&gt;
Date:   Sat Oct 6 09:04:35 2018 +0200

    tafpgm.c: Fix stem width offset handling in storage area.

    Problem reported by Hin-Tak Leung <htl10(a)users.sourceforge.net&gt;.


Version-Release number of selected component (if applicable):
ttfautohint-1.8.1-4.fc29.x86_64

How reproducible:
Always

Steps to Reproduce:
1. "ftview 53 /usr/share/fonts/lohit-devanagari/Lohit-Devanagari.ttf"
2. navigate to glyph idx 472 with F9/F10/F11/F12
3. use up/down arrow key to see that the circular ring of 12 dots disappears
and becomes 3 dots, etc. 

Actual results:
3 dots and fewer than 12 dots for many sizes below about 60.


Expected results:
12 dots for idx 472 at all sizes.

Additional info:
This was discussed on freetype-devel for much of early October under 'rendering
issues with xpdf (and other viewers)'

--- Additional comment from Fedora Update System on 2018-11-07 01:19:20 EST ---

ttfautohint-1.8.2-1.fc29 has been submitted as an update to Fedora 29.
https://bodhi.fedoraproject.org/updates/FEDORA-2018-96f75e9054

--- Additional comment from Fedora Update System on 2018-11-08 00:20:07 EST ---

ttfautohint-1.8.2-1.fc29 has been pushed to the Fedora 29 testing repository.
If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here:
https://bodhi.fedoraproject.org/updates/FEDORA-2018-96f75e9054

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