Module: Fontisan::Ufo::Compile::Hhea

Defined in:
lib/fontisan/ufo/compile/hhea.rb

Overview

Builds the OpenType hhea (horizontal header) table.

See Also:

Constant Summary collapse

VERSION_1_0 = 
0x00010000

Class Method Summary collapse

Class Method Details

.build(font, glyphs:) ⇒ Fontisan::Tables::Hhea

Parameters:

Returns:



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# File 'lib/fontisan/ufo/compile/hhea.rb', line 14

def self.build(font, glyphs:)
  info = font.info
  widths = glyphs.map { |g| g.width.to_i }
  Fontisan::Tables::Hhea.new(
    version_raw: VERSION_1_0,
    ascent: info.ascender || 800,
    descent: info.descender || -200,
    line_gap: info.open_type_hhea_line_gap || 0,
    advance_width_max: widths.max || 0,
    min_left_side_bearing: 0,
    min_right_side_bearing: 0,
    x_max_extent: widths.max || 0,
    caret_slope_rise: 1,
    caret_slope_run: 0,
    caret_offset: 0,
    metric_data_format: 0,
    number_of_h_metrics: glyphs.size,
  )
end