// [実験] BitmapDataのチャネルを入れ替えるのはどうやれば高速か？ // 修正：ColorMatrixFilter一回に対してcopyChannel三回は // かわいそうなので一対一にした（それでも遅いけど）。 package { import flash.display.*; import flash.filters.*; import flash.geom.*; import flash.text.*; import flash.utils.*; public class Main extends Sprite { private var _src:BitmapData; private var _dst:BitmapData; private var _rect:Rectangle; private var _zero:Point; //ColorMatrixFilterで入れ替える用 private var _cmf:ColorMatrixFilter; public function Main():void { _src = new BitmapData(500, 500, false, 0x0); _src.noise(1); _dst = new BitmapData(500, 500, false, 0x0); _rect = new Rectangle(0, 0, 500, 500); _zero = new Point(0, 0); /* //R->G, G->B, B->R _cmf = new ColorMatrixFilter([ 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0 ]); */ //R->G _cmf = new ColorMatrixFilter([ 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0 ]); _setup(); _measure("BitmapData.copyChannelでチャネルを入れ替える", function ():void { _dst.copyChannel(_src, _rect, _zero, BitmapDataChannel.RED , BitmapDataChannel.GREEN); //_dst.copyChannel(_src, _rect, _zero, BitmapDataChannel.GREEN, BitmapDataChannel.BLUE ); //_dst.copyChannel(_src, _rect, _zero, BitmapDataChannel.BLUE , BitmapDataChannel.RED ); }, 100); _measure("ColorMatrixFilterでチャネルを入れ替える", function ():void { _dst.applyFilter(_src, _rect, _zero, _cmf); }, 100); } private function _measure( title:String, func:Function, numTimes:uint, ...params):void { _time = getTimer(); for (var i:int = 0; i < numTimes; i++) { func.apply(null, params); } _time = getTimer() - _time; _debug("[ " + title + " ] --> " + _time + " ms"); } private function _debug(log:String):void { _field.appendText(log + "\n"); } private var _field:TextField; private var _time:uint; private function _setup():void { _field = new TextField(); _field.width = stage.stageWidth; _field.height = stage.stageHeight; var format:TextFormat = _field.defaultTextFormat; format.font = "_sans"; _field.defaultTextFormat = format; addChild(_field); } } }