enum { subpicture_buf_size = 2019 + 25*2024 };

class SubpictureBuf {
	unsigned char buf[subpicture_buf_size];
	int pos;
	int last_dcsqt;
public:
	SubpictureBuf();

	const unsigned char* GetPtr();
	int GetSize() { return pos+1; }

	// clobbers screen buffer
	void SubpictureOn(int on_time, unsigned char* screen, int left, int right, int top, int bottom, bool ntsc);

	void SubpictureOff(int off_time, bool ntsc);
};