bugThe FreeType Project - Bugs: bug #50832, [gvar] Interpolation of untouched...

 
 

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bug #50832: [gvar] Interpolation of untouched points

Submitter:  Sascha Brawer <saschabrawer>
Submitted:  Wed 19 Apr 2017 01:45:16 PM UTC
   
 
Severity:  3 - Normal Item Group:  None
Status:  Fixed Privacy:  Public
Assigned to:  wl Open/Closed:  Closed
Planned Release:  2.8

Tue 02 May 2017 01:17:57 PM UTC, comment #4: 
Sascha Brawer <saschabrawer>
Tue 02 May 2017 12:41:29 PM UTC, comment #3: 

I've applied Behdad's patch.  Thanks!

Werner LEMBERG <wl>
Group administrator
Thu 20 Apr 2017 09:30:21 PM UTC, comment #2: 

This is still being decided in the working group, but we have almost reached agreement, that if the two points with deltas on the two sides have the same coordinate, then inferred delta for the untouched point should be zero.  That's what Apple's implementation does right now.

Behdad Esfahbod <behdad>
Thu 20 Apr 2017 08:55:32 PM UTC, comment #1: 

Behdad, Sascha, do you know which implementation does the right thing?

Werner LEMBERG <wl>
Group administrator
Wed 19 Apr 2017 01:45:16 PM UTC, original submission:  

When points are not touched by gvar interpolation deltas, FreeType currently gives a slightly different result than CoreText.

https://rawgit.com/unicode-org/text-rendering-tests/master/reports/FreeStack.html#GVAR-8

To reproduce this with a custom FreeType build:
https://github.com/unicode-org/text-rendering-tests/blob/master/README.md

Sascha Brawer <saschabrawer>

 

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    Follow 7 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2017-05-02 wl Assigned totetisoft wl
    2017-05-02 wl StatusNeed Info Fixed
        Assigned toNone tetisoft
        Open/ClosedOpen Closed
        Planned ReleaseNone 2.8
    2017-04-20 wl StatusNone Need Info
        Carbon-Copy- Added behdad

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