clipping_flags
unsigned f1 = clipping_flags(*x1, *y1, clip_box);
unsigned f2 = clipping_flags(*x2, *y2, clip_box);
inline unsigned clipping_flags(T x, T y, const rect_base<T>& clip_box)
if(m_clipping) m_f1 = clipping_flags(x1, y1, m_clip_box);
unsigned f2 = clipping_flags(x2, y2, m_clip_box);
if(m_clipping && clipping_flags(xc1, yc1, m_clip_box)) return;
if(m_clipping && clipping_flags(xc, yc, m_clip_box)) return;
unsigned clipping_flags(double x, double y);
m_clip_flags = clipping_flags(x, y);
unsigned flags = clipping_flags(x, y);