Module: Pdfrb::FontLoader::TrueType

Defined in:
lib/pdfrb/font_loader/true_type.rb

Overview

TrueType font loader. Reads a .ttf file, builds the PDF font dict + descriptor, and embeds the font file (optionally subsetted).

Class Method Summary collapse

Class Method Details

.call(document, name_or_io, embedded: true, **_opts) ⇒ Object 



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# File 'lib/pdfrb/font_loader/true_type.rb', line 11

def call(document, name_or_io, embedded: true, **_opts)
  return nil unless name_or_io.is_a?(::String) && File.exist?(name_or_io)
  return nil unless name_or_io.end_with?(".ttf", ".otf")

  font_data = File.binread(name_or_io)
  ttf = Pdfrb::Font::TrueType::File.new(font_data)

  base_font = File.basename(name_or_io, ".*")
  font_dict = document.add(
    {
      Type: :Font,
      Subtype: :TrueType,
      BaseFont: base_font.to_sym,
      FirstChar: 0,
      LastChar: 255
    },
    type: Pdfrb::Model::Type::FontTrueType
  )

  if embedded
    font_stream = document.add(
      { Length1: font_data.bytesize },
      type: Pdfrb::Model::Cos::Stream
    )
    font_stream.stream = font_data

    descriptor = document.add(
      {
        Type: :FontDescriptor,
        FontName: base_font.to_sym,
        Flags: 32,
        FontBBox: [0, 0, 1000, 1000],
        ItalicAngle: 0,
        Ascent: 800,
        Descent: -200,
        CapHeight: 700,
        StemV: 80,
        FontFile2: Pdfrb::Model::Reference.new(font_stream.oid, 0)
      },
      type: Pdfrb::Model::Type::FontDescriptor
    )
    font_dict.value[:FontDescriptor] =
      Pdfrb::Model::Reference.new(descriptor.oid, 0)
  end

  font_dict
end