In module ft2font, the method FT2Font.get_charmap returns a dict that
maps glyph indices to char codes.

I don't understand the purpose of this mapping, and why the method
doesn't return the reverse mapping, i.e. char codes mapped to glyph
indices.

For example, in backend_ps.py, line 754, the charmap is immediately
reversed, just after being loaded:

        cmap = font.get_charmap()
        glyphd = reverse_dict(cmap)

Thanks,

Nicolas Grilly

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