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