# File lib/maruku/ext/math/to_html.rb, line 79
      def adjust_png(png, use_depth)
        src = png.src

        height_in_px = png.height
        depth_in_px = png.depth
        height_in_ex = height_in_px / pixels_per_ex
        depth_in_ex = depth_in_px / pixels_per_ex
        total_height_in_ex = height_in_ex + depth_in_ex
        style = ""
        style << "vertical-align: -#{depth_in_ex}ex;" if use_depth
        style << "height: #{total_height_in_ex}ex;"

        img = xelem('img')
        img['src'] = src
        img['style'] = style
        img['alt'] = "$#{self.math.strip}$"
        img['class'] = 'maruku-png'
        img
      end