package {
	import flash.display.BitmapData;
	import flash.geom.ColorTransform;
	import flash.geom.Matrix;			

	/**
	 * @author Maxime Cousinou
	 */
	public class BitmapManager {
		
		public static function reduceBitmapData (bmp:BitmapData, ratio:Number, transparent:Boolean = true):BitmapData {
			var bmpData:BitmapData 				= new BitmapData(Math.round(bmp.width * ratio), Math.round(bmp.height * ratio), transparent, 0x00FFFFFF);
			var scaleMatrix:Matrix 				= new Matrix(bmpData.width / bmp.width, 0, 0, bmpData.height / bmp.height, 0, 0);
			bmpData.draw(bmp, scaleMatrix);

			return (bmpData);
		}
		
		public static function resizeBitmapData (bmp:BitmapData, ratio:Number, transparent:Boolean = true):BitmapData {
			var bmpData:BitmapData 				= new BitmapData(Math.round(bmp.width * ratio), Math.round(bmp.height * ratio), transparent, 0x00FFFFFF);
			var scaleMatrix:Matrix 				= new Matrix(bmpData.width / bmp.width, 0, 0, bmpData.height / bmp.height, 0, 0);
			var colorTransform:ColorTransform 	= new ColorTransform();
			bmpData.draw(bmp, scaleMatrix, colorTransform, null, null, true);
			
			return (bmpData);
		}
		
		public static function resampleBitmapData (bmp:BitmapData, ratio:Number, transparent:Boolean = true):BitmapData {
			if (ratio >= 1) {
				return (BitmapManager.resizeBitmapData(bmp, ratio, transparent));
			}
			else {
				var bmpData:BitmapData 	= bmp.clone();
				var appliedRatio:Number = 1;
				
				do {
					if (ratio < 0.5 * appliedRatio) {
						bmpData = BitmapManager.resizeBitmapData(bmpData, 0.5, transparent);
						appliedRatio = 0.5 * appliedRatio;
					}
					else {
						bmpData = BitmapManager.resizeBitmapData(bmpData, ratio / appliedRatio, transparent);
						appliedRatio = ratio;
					}
				} while (appliedRatio != ratio);
				
				return (bmpData);
			}
		}
	}
}