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require 'ttfunk/table'
module TTFunk
class Table
class Loca < Table
attr_reader :offsets
# Accepts an array of offsets, with each index corresponding to the
# glyph id with that index.
#
# Returns a hash containing:
#
# * :table - the string representing the table's contents
# * :type - the type of offset (to be encoded in the 'head' table)
def self.encode(offsets)
if offsets.any? { |ofs| ofs > 0xFFFF }
{ :type => 1, :table => offsets.pack("N*") }
else
{ :type => 0, :table => offsets.map { |o| o/2 }.pack("n*") }
end
end
def index_of(glyph_id)
@offsets[glyph_id]
end
def size_of(glyph_id)
@offsets[glyph_id+1] - @offsets[glyph_id]
end
private
def parse!
type = file.header.index_to_loc_format == 0 ? "n" : "N"
@offsets = read(length, "#{type}*")
if file.header.index_to_loc_format == 0
@offsets.map! { |v| v * 2 }
end
end
end
end
end
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