firefox 渲染是最好的
gfx.font_rendering.cleartype.always_use_for_content true
gfx.font_rendering.cleartype_params.cleartype_level 50 (0~100)
gfx.font_rendering.cleartype_params.enhanced_contrast 300 (0~1000)
gfx.font_rendering.cleartype_params.gamma 2200 (1000~2200)
gfx.font_rendering.cleartype_params.pixel_structure 1 (0 = flat, 1 = RGB, 2 = BGR 液晶就用 RGB)
gfx.font_rendering.cleartype_params.rendering_mode 5 (0 = default, 1 = aliased, 2 = GDI Classic, 3 = GDI Natural,
4 = Natural, 5 = Natural Symmetric （带次像素渲染）)
gfx.use_text_smoothing_setting true 或者 false (字体平滑 开不开 看你自己)