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Float yMin value: required argument is not an integer

See original GitHub issue

If a font file has a float value in yMin—and I assume equally in xMin, xMax or yMax—it will fail to save with the error required argument is not an integer (fontTools/misc/sstruct.py in pack at line 75, fonttools v3.40.0).

Trace:

fontTools/misc/sstruct.py in pack at line 75
fontTools/ttLib/tables/_h_e_a_d.py in compile at line 69
fontTools/ttLib/ttFont.py in getTableData at line 651
fontTools/ttLib/ttFont.py in _writeTable at line 633
fontTools/ttLib/ttFont.py in _save at line 212
fontTools/ttLib/ttFont.py in save at line 173

Variables at point of error:

formatstring = ">llIIHHQQhhhhHHhhh"
elements = [
    65536, 
    65601, 
    1208942685, 
    1594834165, 
    3, 
    1000, 
    3551183604, 
    3640213847, 
    -132, 
    -170.009, 
    788, 
    835, 
    0, 
    3, 
    2, 
    0, 
    0
]

As you can see the value -170.009 would trigger the error. If integers are expected then rounding should probably be applied.

Issue Analytics

State:
Created 4 years ago
Comments:9 (6 by maintainers)

Top GitHub Comments

1reaction

PeterDekkerscommented, May 9, 2019

Sure! On it.

0reactions

anthrotypecommented, May 9, 2019

We need to round because head table can only contain integers for the font bounding box values, unlike the CFF FontBBox. I suggest using fontTools.misc.arrayTools.intRect function, which takes the floor/ceill thus guaranteeing the rounded rectangle is not smaller than the original. Would you like to work on a pull request for that?

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