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# frozen_string_literal: true
module TTFunk
class Table
class Cff < TTFunk::Table
# CFF Private dict.
class PrivateDict < TTFunk::Table::Cff::Dict
# Default value of Default Width X.
DEFAULT_WIDTH_X_DEFAULT = 0
# Default value of Nominal Width X.
DEFAULT_WIDTH_X_NOMINAL = 0
# Length of placeholders.
PLACEHOLDER_LENGTH = 5
# Operators we care about in this dict.
OPERATORS = {
subrs: 19,
default_width_x: 20,
nominal_width_x: 21,
}.freeze
# Inverse operator mapping.
OPERATOR_CODES = OPERATORS.invert
# Encode dict.
#
# @return [TTFunk::EncodedString]
def encode
# TODO: use mapping to determine which subroutines are still used.
# For now, just encode them all.
EncodedString.new do |result|
each do |operator, operands|
case OPERATOR_CODES[operator]
when :subrs
result << encode_subrs
else
operands.each { |operand| result << encode_operand(operand) }
end
result << encode_operator(operator)
end
end
end
# Finalize dict.
#
# @param private_dict_data [TTFunk::EncodedString]
# @return [void]
def finalize(private_dict_data)
return unless subr_index
encoded_subr_index = subr_index.encode
encoded_offset = encode_integer32(private_dict_data.length)
private_dict_data.resolve_placeholder(:"subrs_#{@table_offset}", encoded_offset)
private_dict_data << encoded_subr_index
end
# Subroutine index.
#
# @return [TTFunk::Table::Cff::SubrIndex, nil]
def subr_index
@subr_index ||=
if (subr_offset = self[OPERATORS[:subrs]])
SubrIndex.new(file, table_offset + subr_offset.first)
end
end
# Default Width X.
#
# @return [Integer]
def default_width_x
if (width = self[OPERATORS[:default_width_x]])
width.first
else
DEFAULT_WIDTH_X_DEFAULT
end
end
# Nominal Width X.
#
# @return [Integer]
def nominal_width_x
if (width = self[OPERATORS[:nominal_width_x]])
width.first
else
DEFAULT_WIDTH_X_NOMINAL
end
end
private
def encode_subrs
EncodedString.new do |result|
result << Placeholder.new(:"subrs_#{@table_offset}", length: PLACEHOLDER_LENGTH)
end
end
end
end
end
end
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