Function draw_pixels

	void CL_GraphicContext::draw_pixels(
		float x,
		float y,
		const CL_PixelBufferRef & pixel_buffer,
		const CL_Colorf & color = CL_Colorf::white );

	void CL_GraphicContext::draw_pixels(
		float x,
		float y,
		float zoom_x,
		float zoom_y,
		const CL_PixelBufferRef & pixel_buffer,
		const CL_Colorf & color = CL_Colorf::white );