25 lines
913 B
Python
25 lines
913 B
Python
# coding: utf-8
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from .otBase import BaseTTXConverter
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class table__c_i_d_g(BaseTTXConverter):
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"""CID to Glyph ID table
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The AAT ``cidg`` table has almost the same structure as ``gidc``,
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just mapping CIDs to GlyphIDs instead of the reverse direction.
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It is useful for fonts that may be used by a PDF renderer in lieu of
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a font reference with a known glyph collection but no subsetted
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glyphs. For instance, a PDF can say “please use a font conforming
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to Adobe-Japan-1”; the ``cidg`` mapping is necessary if the font is,
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say, a TrueType font. ``gidc`` is lossy for this purpose and is
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obsoleted by ``cidg``.
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For example, the first font in ``/System/Library/Fonts/PingFang.ttc``
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(which Apple ships pre-installed on MacOS 10.12.6) has a ``cidg`` table.
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See also https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6gcid.html
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"""
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pass
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