class Magick::RVG::Utility::TextStrategy

def glyph_metrics(glyph_orientation, glyph)
  gm = @ctx.shadow.get_type_metrics('a' + glyph + 'a')
  gm2 = @ctx.shadow.get_type_metrics('aa')
  h = (gm.ascent - gm.descent + 0.5).to_i
  w = gm.width - gm2.width
  if glyph_orientation.zero? || glyph_orientation == 180
    [w, h]
  else
    [h, w]
  end
end