Class: Fontisan::Export::Transformers::Os2Transformer

Inherits:
Object
  • Object
show all
Defined in:
lib/fontisan/export/transformers/os2_transformer.rb

Overview

Os2Transformer transforms OS/2 table to TTX format

Converts Fontisan::Tables::Os2 to Models::Ttx::Tables::Os2Table following proper model-to-model transformation principles.

Class Method Summary collapse

Class Method Details

.format_binary_flags(value, bits) ⇒ String

Format binary flags

Parameters:

  • value (Integer) —

    Integer value

  • bits (Integer) —

    Number of bits

Returns:

  • (String) —

    Binary string with spaces every 8 bits



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# File 'lib/fontisan/export/transformers/os2_transformer.rb', line 114

def self.format_binary_flags(value, bits)
  binary = value.to_s(2).rjust(bits, "0")
  binary.scan(/.{1,8}/).join(" ")
end

.to_int(value) ⇒ Integer

Convert BinData value to native Ruby integer

Parameters:

  • value (Object) —

    BinData value or integer

Returns:

  • (Integer) —

    Native integer



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# File 'lib/fontisan/export/transformers/os2_transformer.rb', line 105

def self.to_int(value)
  value.respond_to?(:to_i) ? value.to_i : value
end

.transform(os2_table) ⇒ Models::Ttx::Tables::Os2Table

Transform OS/2 table to TTX model

Parameters:

Returns:



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# File 'lib/fontisan/export/transformers/os2_transformer.rb', line 17

def self.transform(os2_table)
  return nil unless os2_table

  version = to_int(os2_table.version)

  Models::Ttx::Tables::Os2Table.new.tap do |ttx|
    ttx.version = version
    ttx.x_avg_char_width = to_int(os2_table.x_avg_char_width)
    ttx.us_weight_class = to_int(os2_table.us_weight_class)
    ttx.us_width_class = to_int(os2_table.us_width_class)
    ttx.fs_type = format_binary_flags(to_int(os2_table.fs_type), 16)
    ttx.y_subscript_x_size = to_int(os2_table.y_subscript_x_size)
    ttx.y_subscript_y_size = to_int(os2_table.y_subscript_y_size)
    ttx.y_subscript_x_offset = to_int(os2_table.y_subscript_x_offset)
    ttx.y_subscript_y_offset = to_int(os2_table.y_subscript_y_offset)
    ttx.y_superscript_x_size = to_int(os2_table.y_superscript_x_size)
    ttx.y_superscript_y_size = to_int(os2_table.y_superscript_y_size)
    ttx.y_superscript_x_offset = to_int(os2_table.y_superscript_x_offset)
    ttx.y_superscript_y_offset = to_int(os2_table.y_superscript_y_offset)
    ttx.y_strikeout_size = to_int(os2_table.y_strikeout_size)
    ttx.y_strikeout_position = to_int(os2_table.y_strikeout_position)
    ttx.s_family_class = to_int(os2_table.s_family_class)
    ttx.panose = transform_panose(os2_table.panose)
    ttx.ul_unicode_range_1 = format_binary_flags(
      to_int(os2_table.ul_unicode_range1), 32
    )
    ttx.ul_unicode_range_2 = format_binary_flags(
      to_int(os2_table.ul_unicode_range2), 32
    )
    ttx.ul_unicode_range_3 = format_binary_flags(
      to_int(os2_table.ul_unicode_range3), 32
    )
    ttx.ul_unicode_range_4 = format_binary_flags(
      to_int(os2_table.ul_unicode_range4), 32
    )
    ttx.ach_vend_id = os2_table.vendor_id.to_s.strip
    ttx.fs_selection = format_binary_flags(
      to_int(os2_table.fs_selection), 16
    )
    ttx.us_first_char_index = to_int(os2_table.us_first_char_index)
    ttx.us_last_char_index = to_int(os2_table.us_last_char_index)

    if version >= 1
      ttx.s_typo_ascender = to_int(os2_table.s_typo_ascender)
      ttx.s_typo_descender = to_int(os2_table.s_typo_descender)
      ttx.s_typo_line_gap = to_int(os2_table.s_typo_line_gap)
      ttx.us_win_ascent = to_int(os2_table.us_win_ascent)
      ttx.us_win_descent = to_int(os2_table.us_win_descent)
    end

    if version >= 2
      ttx.ul_code_page_range_1 = format_binary_flags(
        to_int(os2_table.ul_code_page_range1), 32
      )
      ttx.ul_code_page_range_2 = format_binary_flags(
        to_int(os2_table.ul_code_page_range2), 32
      )
    end
  end
end

.transform_panose(panose) ⇒ Models::Ttx::Tables::Panose

Transform Panose data

Parameters:

  • panose (Object) —

    Panose data (String or Array)

Returns:



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# File 'lib/fontisan/export/transformers/os2_transformer.rb', line 82

def self.transform_panose(panose)
  return nil unless panose

  bytes = panose.is_a?(String) ? panose.bytes : panose.to_a

  Models::Ttx::Tables::Panose.new.tap do |ttx_panose|
    ttx_panose.b_family_type = bytes[0]
    ttx_panose.b_serif_style = bytes[1]
    ttx_panose.b_weight = bytes[2]
    ttx_panose.b_proportion = bytes[3]
    ttx_panose.b_contrast = bytes[4]
    ttx_panose.b_stroke_variation = bytes[5]
    ttx_panose.b_arm_style = bytes[6]
    ttx_panose.b_letter_form = bytes[7]
    ttx_panose.b_midline = bytes[8]
    ttx_panose.b_x_height = bytes[9]
  end
end