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Type1 fonts can be one of 14 "built in" standard fonts. In these cases, the reader is expected to have it's own copy of the font metrics. see Section 9.6.2.2, PDF 32000-1:2008, pp 256
# File lib/pdf/reader/width_calculator/built_in.rb, line 63 def initialize(font) @font = font @@all_metrics ||= PDF::Reader::SynchronizedCache.new metrics_path = File.join(File.dirname(__FILE__), "..","afm","#{font.basefont}.afm") if File.file?(metrics_path) @metrics = @@all_metrics[metrics_path] ||= AFM::Font.new(metrics_path) else raise ArgumentError, "No built-in metrics for #{font.basefont}" end end
# File lib/pdf/reader/width_calculator/built_in.rb, line 76 def glyph_width(code_point) return 0 if code_point.nil? || code_point < 0 m = @metrics.char_metrics_by_code[code_point] if m.nil? names = @font.encoding.int_to_name(code_point) m = names.map { |name| @metrics.char_metrics[name.to_s] }.compact.first end if m m[:wx] elsif @font.widths[code_point - 1] @font.widths[code_point - 1] else raise ArgumentError, "Unknown glyph width for #{code_point} #{@font.basefont}" end end
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