void graphics_context::draw_glyph_underline(const point& aPoint, const glyph& aGlyph, const font& aFont, const colour& aColour) const
{
auto yLine = logical_coordinates()[1] > logical_coordinates()[3] ?
(aFont.height() + aFont.descender()) - std::ceil(aFont.native_font_face().underline_position()) :
-aFont.descender() + std::ceil(aFont.native_font_face().underline_position());
const i_glyph_texture& glyphTexture = !aGlyph.use_fallback() ? aFont.native_font_face().glyph_texture(aGlyph) : aGlyph.fallback_font(aFont).native_font_face().glyph_texture(aGlyph);
draw_line(
aPoint + point{ glyphTexture.placement().x, yLine },
aPoint + point{ glyphTexture.placement().x + glyphTexture.extents().cx, yLine },
pen{ aColour, std::ceil(aFont.native_font_face().underline_thickness()) });
}
