static IntPtr hide_overlay(IntPtr Self, IntPtr Args)
{
int frames = (int)Ruby.Integer.FromPtr(Ruby.GetIVar(Self, "@frame_rate")) / 4;
if (Ruby.Array.Length(Args) != 0)
{
Ruby.Array.Expect(Args, 1);
Ruby.Array.Expect(Args, 0, "Integer");
frames = (int)Ruby.Integer.FromPtr(Ruby.Array.Get(Args, 0));
}
if (Ruby.Integer.FromPtr(Ruby.GetIVar(OverlaySprite, "@opacity")) == 0)
{
return(Ruby.False);
}
if (frames == 0)
{
Ruby.Funcall(OverlaySprite, "opacity=", Ruby.Integer.ToPtr(0));
return(Ruby.True);
}
bool hasblock = Ruby.HasBlock();
for (int i = 1; i <= frames; i++)
{
Ruby.Funcall(OverlaySprite, "opacity=", Ruby.Float.ToPtr(255 - 255d / frames * i));
if (hasblock)
{
Ruby.Yield(Ruby.Integer.ToPtr(i - 1));
}
update(Self, Ruby.Array.Create());
}
return(Ruby.True);
}