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# frozen_string_literal: true
require_relative '../table'
module TTFunk
class Table
# Vertical Origin (`VORG`) table.
class Vorg < Table
# Table tag.
TAG = 'VORG'
# Table major version.
# @return [Integer]
attr_reader :major_version
# Table minor version.
# @return [Integer]
attr_reader :minor_version
# The default y coordinate of a glyph’s vertical origin.
# @return [Integer]
attr_reader :default_vert_origin_y
# Number of vertical origin metrics.
# @return [Integer]
attr_reader :count
# Encode table.
#
# @return [String]
def self.encode(vorg)
return unless vorg
''.b.tap do |table|
table << [
vorg.major_version, vorg.minor_version,
vorg.default_vert_origin_y, vorg.count,
].pack('n*')
vorg.origins.each_pair do |glyph_id, vert_origin_y|
table << [glyph_id, vert_origin_y].pack('n*')
end
end
end
# Get vertical origina for glyph by ID.
#
# @param glyph_id [Integer]
# @return [Integer]
def for(glyph_id)
@origins.fetch(glyph_id, default_vert_origin_y)
end
# Table tag.
#
# @return [String]
def tag
TAG
end
# Origins map.
#
# @return [Hash{Integer => Integer}]
def origins
@origins ||= {}
end
private
def parse!
@major_version, @minor_version = read(4, 'n*')
@default_vert_origin_y = read_signed(1).first
@count = read(2, 'n').first
count.times do
glyph_id = read(2, 'n').first
origins[glyph_id] = read_signed(1).first
end
end
end
end
end
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