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# frozen_string_literal: true
require_relative '../table'
module TTFunk
class Table
# Glyph Data (`glyf`) table.
class Glyf < Table
# Encode table.
#
# @param glyphs [Hash] a hash mapping (old) glyph-ids to glyph objects
# @param new_to_old [Hash{Integer => Integer}] a hash mapping new glyph
# IDs to glyph IDs in the original font.
# @param old_to_new [Hash{Integer => Integer}] a hash mapping old glyph
# IDs to new glyph IDs.
# @return [Hash]
# * `:table` (<tt>String</tt>) - encoded table.
# * `:offsets` (<tt>Array\<Integer></tt>) - glyph offsets in the table.
def self.encode(glyphs, new_to_old, old_to_new)
result = { table: +'', offsets: [] }
new_to_old.keys.sort.each do |new_id|
glyph = glyphs[new_to_old[new_id]]
result[:offsets] << result[:table].length
result[:table] << glyph.recode(old_to_new) if glyph
end
# include an offset at the end of the table, for use in computing the
# size of the last glyph
result[:offsets] << result[:table].length
result
end
# Get glyph by ID.
#
# @param glyph_id [Integer]
# @return [TTFunk::Table::Glyf::Simple, TTFunk::Table::Glyf::Compound,
# nil]
def for(glyph_id)
return @cache[glyph_id] if @cache.key?(glyph_id)
index = file.glyph_locations.index_of(glyph_id)
size = file.glyph_locations.size_of(glyph_id)
if size.zero? # blank glyph, e.g. space character
@cache[glyph_id] = nil
return
end
parse_from(offset + index) do
raw = io.read(size)
number_of_contours = to_signed(raw.unpack1('n'))
@cache[glyph_id] =
if number_of_contours == -1
Compound.new(glyph_id, raw)
else
Simple.new(glyph_id, raw)
end
end
end
private
def parse!
# because the glyf table is rather complex to parse, we defer
# the parse until we need a specific glyf, and then cache it.
@cache = {}
end
end
end
end
require_relative 'glyf/compound'
require_relative 'glyf/path_based'
require_relative 'glyf/simple'
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