package away3d.tools.utils
{
	import flash.display.BitmapData;
	
	public class TextureUtils
	{
		private static const MAX_SIZE:uint = 4096;
		
		public static function isBitmapDataValid(bitmapData:BitmapData):Boolean
		{
			if (bitmapData == null)
				return true;
			
			return isDimensionValid(bitmapData.width) && isDimensionValid(bitmapData.height);
		}
		
		public static function isDimensionValid(d:uint):Boolean
		{
			return d >= 1 && d <= MAX_SIZE && isPowerOfTwo(d);
		}
		
		public static function isPowerOfTwo(value:int):Boolean
		{
			return value? ((value & -value) == value) : false;
		}
		
		public static function getBestPowerOf2(value:uint):uint
		{
			var p:uint = 1;
			
			while (p < value)
				p <<= 1;
			
			if (p > MAX_SIZE)
				p = MAX_SIZE;
			
			return p;
		}
	}
}