package
{
import flash.display.Sprite;
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.events.Event;
import flash.utils.getTimer;
import flash.text.TextField;
import flash.utils.ByteArray;
import flash.geom.Rectangle;

public class BufferTest3 extends Sprite
{
	public static const BUFFER_WIDTH:int = 800;
	public static const BUFFER_HEIGHT:int = 600;
	
	private var outputBitmapData:BitmapData;
	private var outputBitmap:Bitmap;
	
	private var t:Number;
	private var dt:Number = .01;
	
	private var frameTimeTxt:TextField;
	
	private var buffer:ByteArray;

	public function BufferTest3()
	{
		outputBitmapData = new BitmapData(BUFFER_WIDTH, BUFFER_HEIGHT, true);
		outputBitmap = new Bitmap(outputBitmapData);
		addChild(outputBitmap);
		
		var rect:Rectangle = new Rectangle(0, 0, BUFFER_WIDTH, BUFFER_HEIGHT);
		buffer = outputBitmapData.getPixels(rect);
		
		frameTimeTxt = new TextField();
		frameTimeTxt.x = 8;
		frameTimeTxt.y = 8;
		frameTimeTxt.textColor = 0xFFFFFF;
		addChild(frameTimeTxt);
		
		t = 0;
		addEventListener(Event.ENTER_FRAME, update, false, 0, true);
	}
	
	public function update(e:*)
	{
		var timer:Number = getTimer();
		
		t += dt;
		
		var x:int;
		var y:int;
		var r:int;
		var g:int;
		var b:int;
		
		buffer.position = 0;
		var offset:int = 0;
		
		
		for(y = 0; y < BUFFER_HEIGHT; ++y)
		{
			for(x = 0; x < BUFFER_WIDTH; ++x)
			{
				r = (t*100 + 255 * x / BUFFER_WIDTH)%255;
				g = 180;
				b = 180;
				
				//++offset;
				//buffer[offset++] = r;
				//buffer[offset++] = g;
				//buffer[offset++] = b;
				
				// very slow
				buffer.writeByte(255);
				buffer.writeByte(r);
				buffer.writeByte(g);
				buffer.writeByte(b);
				
				//buffer.writeUnsignedInt( (255<<24) + (r<<16) + (g<<8) + b );
				
				//buffer.writeInt( (255<<24) + (r<<16) + (g<<8) + b );
			}
		} 

		var rect:Rectangle = new Rectangle(0,0,BUFFER_WIDTH,BUFFER_HEIGHT);
		buffer.position = 0;
		outputBitmapData.lock();
		outputBitmapData.setPixels(rect, buffer);
		outputBitmapData.unlock();
		
		var fps:Number = 1.0/((getTimer() - timer) / 1000.0);
		frameTimeTxt.text = "fps: " + int(fps);
		
	}
	


}
}