mutator-fix.py

mutator-fix.py

# snip: https://github.com/fonttools/fonttools/blob/51a49de3eda4c10df29ceba85a90e7d7378137e8/Lib/fontTools/varLib/mutator.py#L303-L310

if glyf:
    for glyph in glyf.glyphs.values():
        if hasattr(glyph, "program"):
            instructions = glyph.program.getAssembly()
            # If GETVARIATION opcode is used in bytecode of any glyph add IDEF
            addidef = any(op.startswith("GETVARIATION") for op in instructions)
            if addidef:
                break
    # need to add a parameter in the 
    # instantiateVariableFont call
    # e.g.
    # def instantiateVariableFont(varfont, location, inplace=False, set_macos_overlap_flag=False)
    # and create an argparse command line argument that is used in the mutator executable
    # function call. Then use the flag to determine execution of the following source:
    if set_macos_overlap_flag:
        for glyph in glyf.keys():
            glyph = glyf[glyph_name]
            # Only needs to be set for glyphs with contours
            if glyph.numberOfContours > 0:
                glyph.flags[0] |= 1 << 6