53 lines
1.4 KiB
Ruby
53 lines
1.4 KiB
Ruby
# frozen_string_literal: true
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module TTFunk
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# Encodes a CFF-based OpenType font subset to its binary representation.
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class OTFEncoder < TTFEncoder
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# Optimal table order according to OpenType specification.
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OPTIMAL_TABLE_ORDER = ['head', 'hhea', 'maxp', 'OS/2', 'name', 'cmap', 'post', 'CFF '].freeze
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private
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# CFF fonts don't maintain a glyf table, all glyph information is stored
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# in the charstrings index. Return an empty hash here to indicate a glyf
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# table should not be encoded.
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def glyf_table
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@glyf_table ||= {}
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end
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# Since CFF fonts don't maintain a glyf table, they also don't maintain
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# a loca table. Return an empty hash here to indicate a loca table
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# shouldn't be encoded.
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def loca_table
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@loca_table ||= {}
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end
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def base_table
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@base_table ||= TTFunk::Table::Simple.new(original, 'BASE').raw
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end
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def cff_table
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@cff_table ||= original.cff.encode(subset)
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end
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def vorg_table
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@vorg_table ||= TTFunk::Table::Vorg.encode(original.vertical_origins)
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end
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def tables
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@tables ||= super.merge(
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'BASE' => base_table,
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'VORG' => vorg_table,
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'CFF ' => cff_table,
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).compact
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end
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def optimal_table_order
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# DSIG is always last
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OPTIMAL_TABLE_ORDER +
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(tables.keys - ['DSIG'] - OPTIMAL_TABLE_ORDER) +
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['DSIG']
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end
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end
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end
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