[ttx_diff] Add a 'total diff' number to json output

googlefonts / fontc

Where in we pursue oxidizing (context: https://github.com/googlefonts/oxidize) fontmake.

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[ttx_diff] Add a 'total diff' number to json output #864

Closed cmyr closed 2 months ago

cmyr commented 2 months ago

This tries to quantify the total size of the difference across all tables in a font, based on the total number of lines that differ in the ttx/otl-normalizer output.

This is not hugely scientific, but will give us a single number that we can track per-font.