add chromacheck color fonts to test suite

I have a working sbix testfont that I know ttx was able to handle properly half a year ago. Today I decompiled it with ttx version 3.21.2 (and before updating, 3.19.0) and tried to recompile it without making any changes.

This resulted in the following error:

$ ttx chromacheck-sbix.ttx
Compiling "chromacheck-sbix.ttx" to "chromacheck-sbix#1.ttf"...
Parsing 'GlyphOrder' table...
Parsing 'head' table...
Parsing 'hhea' table...
Parsing 'maxp' table...
Parsing 'OS/2' table...
Parsing 'hmtx' table...
Parsing 'cmap' table...
Parsing 'loca' table...
Parsing 'glyf' table...
Parsing 'name' table...
Parsing 'post' table...
Parsing 'sbix' table...
ERROR: Unhandled exception has occurred
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/fontTools/ttx.py", line 389, in main
    process(jobs, options)
  File "/usr/local/lib/python3.6/site-packages/fontTools/ttx.py", line 363, in process
    action(input, output, options)
  File "/usr/local/lib/python3.6/site-packages/fontTools/misc/loggingTools.py", line 372, in wrapper
    return func(*args, **kwds)
  File "/usr/local/lib/python3.6/site-packages/fontTools/ttx.py", line 281, in ttCompile
    ttf.save(output)
  File "/usr/local/lib/python3.6/site-packages/fontTools/ttLib/__init__.py", line 221, in save
    self._writeTable(tag, writer, done)
  File "/usr/local/lib/python3.6/site-packages/fontTools/ttLib/__init__.py", line 660, in _writeTable
    tabledata = self.getTableData(tag)
  File "/usr/local/lib/python3.6/site-packages/fontTools/ttLib/__init__.py", line 671, in getTableData
    return self.tables[tag].compile(self)
  File "/usr/local/lib/python3.6/site-packages/fontTools/ttLib/tables/_s_b_i_x.py", line 81, in compile
    current_strike.compile(ttFont)
  File "/usr/local/lib/python3.6/site-packages/fontTools/ttLib/tables/sbixStrike.py", line 86, in compile
    self.glyphDataOffsets += sstruct.pack(sbixGlyphDataOffsetFormat, current_glyph)
TypeError: must be str, not bytes

Any idea what’s going wrong?

[RoelN]

@anthrotype But certainly! The ChromaCheck fonts (or, all of it in fact) are free to re-use.

Take heed that I’m updating the fonts at this moment, so I’ll be pushing new versions later tonight. For some reason the COLR font doesn’t render in Firefox any more, and I’m adding a glyf table to the CBDT one to make it spec compliant. So you might want to wait for that before you include them in your test suite.

Curious to find out what your favourite bug is! 😄

[RoelN]

The color fonts in ChromaCheck have been updated and ready for use! Each font has a unicode character in a specific red (e.g. rgb(50, 0, 0)) and I check if that exact red is being drawn to the canvas. I hope you can do something with 'em!

(Please note that the test for CBDT fails, I’ll be looking into why during lunch)