Module: Fontisan::Ufo::Compile::Hmtx

Defined in:

lib/fontisan/ufo/compile/hmtx.rb

Overview

Builds the OpenType hmtx (horizontal metrics) table. One LongHorMetric per glyph (4 bytes each):

uint16 advanceWidth, int16 lsb

No trailing "leftSideBearing" array (use numberOfHMetrics = numGlyphs).

See Also:

• https://learn.microsoft.com/en-us/typography/opentype/spec/hmtx

Class Method Summary

• .build(_font, glyphs:) ⇒ String

  Hmtx table bytes.

Class Method Details

.build(_font, glyphs:) ⇒ String

Returns hmtx table bytes.

Parameters:

• _font (Fontisan::Ufo::Font)
• glyphs (Array<Fontisan::Ufo::Glyph>) —

  in gid order

Returns:

• (String) —

  hmtx table bytes

# File 'lib/fontisan/ufo/compile/hmtx.rb', line 15

def self.build(_font, glyphs:)
  data = +""
  glyphs.each do |glyph|
    bbox = glyph.bbox
    lsb = bbox ? bbox.x_min.to_i : 0
    data << [glyph.width.to_i, lsb].pack("nn")
  end
  data
end