Delegate paint_linear_gradient_func_t
public delegate void paint_linear_gradient_func_t(IntPtr funcs, IntPtr paintData, IntPtr colorLine, float x0, float y0, float x1, float y1, float x2, float y2, IntPtr userData)
public delegate void paint_linear_gradient_func_t(IntPtr funcs, IntPtr paintData, IntPtr colorLine, float x0, float y0, float x1, float y1, float x2, float y2, IntPtr userData)