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# coding: utf-8
# typed: strict
# frozen_string_literal: true
class PDF::Reader
module WidthCalculator
# CIDFontType0 or CIDFontType2 use DW (integer) and W (array) to determine
# codepoint widths, note that CIDFontType2 will contain a true type font
# program which could be used to calculate width, however, a conforming writer
# is supposed to convert the widths for the codepoints used into the W array
# so that it can be used.
# see Section 9.7.4.1, PDF 32000-1:2008, pp 269-270
class Composite
#: (PDF::Reader::Font) -> void
def initialize(font)
@font = font
@widths = PDF::Reader::CidWidths.new(
@font.cid_default_width, @font.cid_widths
) #: PDF::Reader::CidWidths
end
#: (Integer?) -> Numeric
def glyph_width(code_point)
return 0 if code_point.nil? || code_point < 0
w = @widths[code_point]
# 0 is a valid width
if w
w.to_f
else
0
end
end
end
end
end
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