Object
monkey patch the afm gem to give us access to the metrics by glyph code. I’ve got a pull request to upstream so hopefully this can be removed soon. See github.com/halfbyte/afm/pull/3
Loading a Font Metrics file by absolute path (no automatic font path resolution)
# File lib/pdf/reader/width_calculator/built_in.rb, line 12 def initialize(filename) @metadata = {} @char_metrics = {} @char_metrics_by_code = {} @kern_pairs = [] File.open(filename) do |file| mode = :meta file.each_line do |line| case(line) when /^StartFontMetrics/ ; mode = :meta when /^StartCharMetrics/ ; mode = :char_metrics when /^EndCharMetrics/ ; mode = :meta when /^StartKernData/ ; mode = :kern_data when /^StartKernPairs/ ; mode = :kern_pairs when /^EndKernPairs/ ; mode = :kern_data when /^EndKernData/ ; mode = :meta else case(mode) when :meta if match = line.match(/^([\w]+) (.*)$/) @metadata[match[1]] = match[2] end when :char_metrics metrics = {} metrics[:charcode] = match[1].to_i if match = line.match(/C (-?\d+) *?;/) metrics[:wx] = match[1].to_i if match = line.match(/WX (-?\d+) *?;/) metrics[:name] = match[1] if match = line.match(/N ([.\w]+) *?;/) if match = line.match(/B (-?\d+) (-?\d+) (-?\d+) (-?\d+) *?;/) metrics[:boundingbox] = [match[1].to_i, match[2].to_i, match[3].to_i, match[4].to_i] end @char_metrics[metrics[:name]] = metrics if metrics[:name] @char_metrics_by_code[metrics[:charcode]] = metrics if metrics[:charcode] && metrics[:charcode] > 0 when :kern_pairs if match = line.match(/^KPX ([.\w]+) ([.\w]+) (-?\d+)$/) @kern_pairs << [match[1], match[2], match[3].to_i] end end end end end end
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