Issue: Bit 3 on the flags of the head table

[Ked G]

I am trying to pass the font bakery challenge for google fonts and a test that keeps failing is "PPEM must be an integer on hinted fonts." The message says:

This is a hinted font, so it must have bit 3 set on the flags of the head table, so that PPEM values will be rounded into an integer value.

This can be accomplished by using the 'gftools fix-hinting' command.

How do I fix this? How can I update the flags value in my ttf files OR instead fix this issue pre-export? I use GlyphsApp.

[bgh...@gmail.com]

Hi Ked!

You'll want to install gftools from https://github.com/googlefonts/gftools in a python virtual environment.

once you've installed gftools in your venv, you'll want to run the command gftools fix-hinting yourfontname.ttf on your font.

putting this all inside of a build script will help others install your font from source. 

here's a link to a repo i made for a small fontbakery workshop with links at the bottom to a lot of helpful tools for font baking.

https://github.com/bghryct/TheGreatFontbakeryShow

good luck!

-mirko

[Dave Crossland]

Did the gftools fix-hinting command not address this?

The check itself may be buggy. 

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[Ked G]

Thanks for the replies. 

I ran the gftools fix-hinting <ttf-file> command on each ttf font file and it generates a .ttf.fix file for each font file.

Is this an expected behavior? How do I proceed from here?

[Dave Crossland]

Install fonttools and run 

ttx font.ttx

That will by default create font.ttf

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[bgh...@gmail.com]

I'm not sure about that Dave. I think fix-hinting adds a .fix extension to new copies of the original fonts that it has fixed. 

you could try this ked. 

fonts=$(path/to/your/*.ttf)

echo "Fixing Hinting"

for font in $fonts

do

# gftools fix-hinting $font;

gftools fix-hinting $font $font;

if [ -f "$font.fix" ]; then mv "$font.fix" $font; fi

done

[Ked G]

Thanks Dave and bghryct 🙏

This has been definitely helpful.

For anyone having the same issue, here's the solution summary:

- Get gftools

- Run gftools fix-hinting font-name.ttf

  This will generate a file: font-name.ttf.fix

- Discard the font-name.ttf file and rename font-name.ttf.fix to font-name.ttf

To automate this for multiple files, here's a modified version of bghryct's script that worked for me:

echo "Fixing Hinting"

for font in *.ttf

do

gftools fix-hinting $font;

if [ -f "$font.fix" ]; then mv "$font.fix" $font; fi

done

Be sure to be inside the same folder as the *.ttf files to avoid chmod issues.

[bgh...@gmail.com]

glad it worked for you!