/*
  File: Gfx.hx
  Date: 08/09/08
  Author: Michael Norton
  Copyright 2008, all rights reserved Michael Norton, Black Hole Computing
  Use how you wish FREELY - permission required for commercial use
*/

import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.geom.Rectangle;
import flash.geom.Point;


class Gfx {
	
 	private var _offscreenBitmap:Bitmap;
 	private var _offscreenBitmapData:BitmapData;
 	private var _viewportBitmap:Bitmap;
 	private var _viewportBitmapData:BitmapData;
 	private var _viewport_height : Int;
 	private var _viewport_width : Int;
 	
 	public function new( width: Int, height : Int ){
	  // create the offscreen buffer
      _offscreenBitmapData = new BitmapData(width, height, false, 0xffff00);
      _offscreenBitmap = new Bitmap(_offscreenBitmapData);

      // create the viewport buffer
      Gfx_setup_Viewport( width, height);

	  // make the viewport active in Flash
	  flash.Lib.current.addChild(_viewportBitmap);
		
	}	
	
	// function setup_Viewport
	//  define the dimension height x width in pixels
	//  of the viewport.
	public function Gfx_setup_Viewport( width:Int, height:Int) {
	   _viewport_height = height;
	   _viewport_width = width;
	   _viewportBitmapData = new BitmapData(width, height, false, 0x000000);
	   _viewportBitmap = new Bitmap(_viewportBitmapData);	
	}
	// END Gfx_setup_Viewport
	
	// function copy_Offscreen_to_Viewport
	//    copy the _offscreenBitmapData to the _viewportBitmapData
	//    ..updates the screen..
	public function Gfx_copy_Offscreen_to_Viewport() {

      var srcRect = new Rectangle(0,0,256,192);
      var dstPt = new Point(0,0);
      
	  // copy the offscreen bitmap data to the viewport bitmap data
       _viewportBitmapData.copyPixels( _offscreenBitmapData, srcRect, dstPt);
    } // END copy_Offscreen_to_Viewport

    // function copyPixels_to_Offscreen
	// 
    public function Gfx_copyPixels_to_Offscreen( bitmapdata:BitmapData, srcRect:Rectangle, dstPt:Point ) {

      _offscreenBitmapData.copyPixels(bitmapdata, srcRect, dstPt );
    }	
}
// END class Gfx