Function sctk_adwaita::draw_headerbar_bg

pub(crate) fn draw_headerbar_bg(
    pixmap: &mut PixmapMut<'_>,
    scale: f32,
    margin_h: f32,
    margin_v: f32,
    colors: &ColorMap,
    is_maximized: bool,
    tiled: bool
) -> Option<()>