/* 
   * PROJECT: FLARToolKit
   * --------------------------------------------------------------------------------
   * This work is based on the NyARToolKit developed by
   *   R.Iizuka (nyatla)
   * http://nyatla.jp/nyatoolkit/
   *
   * The FLARToolKit is ActionScript 3.0 version ARToolkit class library.
   * Copyright (C)2008 Saqoosha
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   * 
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   * 
   * You should have received a copy of the GNU General Public License
   * along with this framework; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   * 
   * For further information please contact.
   *        http://www.libspark.org/wiki/saqoosha/FLARToolKit
   *        <saq(at)saqoosha.net>
   * 
   */
  
  package org.libspark.flartoolkit.core.rasterfilter.rgb2bin {
          
          import flash.display.BitmapData;
          import flash.filters.ColorMatrixFilter;
          import flash.geom.Point;
          import flash.geom.Rectangle;
          
          import org.libspark.flartoolkit.core.raster.FLARRaster_BitmapData;
          import org.libspark.flartoolkit.core.raster.IFLARRaster;
          import org.libspark.flartoolkit.core.raster.rgb.FLARRgbRaster_BitmapData;
          import org.libspark.flartoolkit.core.raster.rgb.IFLARRgbRaster;
  
          public class @ax-student-ar-org-libspark-flartoolkit-core-rasterfilter-rgb2bin-FLARRasterFilter-BitmapDataThreshold implements IFLARRasterFilter_RgbToBin {
                  
                  private static const ZERO_POINT:Point = new Point();
                  private static const ONE_POINT:Point = new Point(1, 1);
                  private static const MONO_FILTER:ColorMatrixFilter = new ColorMatrixFilter([
                          0.2989, 0.5866, 0.1145, 0, 0,
                          0.2989, 0.5866, 0.1145, 0, 0,
                          0.2989, 0.5866, 0.1145, 0, 0,
                          0, 0, 0, 1, 0
                  ]);
                  
                  private var _threshold:int;
                  private var _tmp:BitmapData;
                  
                  public function @ax-student-ar-org-libspark-flartoolkit-core-rasterfilter-rgb2bin-FLARRasterFilter-BitmapDataThreshold(i_threshold:int) {
                          this._threshold = i_threshold;
                  }
  
                  public function setThreshold(i_threshold:int):void {
                          this._threshold = i_threshold;
                  }
  
                  public function doFilter(i_input:IFLARRgbRaster, i_output:IFLARRaster):void {
                          var inbmp:BitmapData = FLARRgbRaster_BitmapData(i_input).bitmapData;
                          if (!this._tmp) {
                                  this._tmp = new BitmapData(inbmp.width, inbmp.height, false, 0x0);
                          } else if (inbmp.width != this._tmp.width || inbmp.height != this._tmp.height) {
                                  this._tmp.dispose();
                                  this._tmp = new BitmapData(inbmp.width, inbmp.height, false, 0x0);
                          }
                          this._tmp.applyFilter(inbmp, inbmp.rect, ZERO_POINT, MONO_FILTER);
                          var outbmp:BitmapData = FLARRaster_BitmapData(i_output).bitmapData;
                          outbmp.fillRect(outbmp.rect, 0x0);
                          var rect:Rectangle = outbmp.rect;
                          rect.inflate(-1, -1);
                          outbmp.threshold(this._tmp, rect, ONE_POINT, '<=', this._threshold, 0xffffffff, 0xff);
                  }
          }
  }