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POAS3 Blitting is Slower than a Movieclip. Why?
 

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  1. POAS3 Blitting is Slower than a Movieclip. Why?
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    <p>I tried following a combination of Lee Brimlow's blitting tutorial series and and the technique in Rex Van der spuy's "advanced game design with flash"</p> <p>I am a developer working on a web online virutal world made in flash. I made a phone application (works similar to the phone in grand theft auto games). Anyway, when a message is sent we want to play this crazy animation of an envelope flying around and transforming with sparkles around it. It was laggy (especially on older computers) so I thought it would be a great chance to use blitting. However, the blitting animation actually plays slower than a regular movieclip!! What the heck is going on here? Is blitting only better for mobile devices and actually slower on computers? Maybe I am doing something wrong. Here is my code:</p> <p>// THIS PART HAPPENS WHEN PHONE IT INITIALIZED</p> <pre><code>//** //---------------- Blitting stuff ---------------------------------- // add this bitmap stage to the display list so we can see it _bitmapStage = new BitmapData(550, 400, true, 0xD6D6D6); _phoneItself.addChild(new Bitmap(_bitmapStage)); var _spritesheetClass:Class = getDefinitionByName("ESpritesheet_1") as Class; _spritesheet = new _spritesheetClass() as BitmapData; _envelopeBlit = new BlitSprite(_spritesheet, BlitConfig.envelopeAnimAry , _bitmapStage); _envelopeBlit.x = -100; _envelopeBlit.y = 0; _envelopePlayTimer = new Timer(5, 0); _envelopePlayTimer.addEventListener(TimerEvent.TIMER, onEnterTimerFrame); _envelopeBlit.addEventListener("ENV_ANIM_DONE", onEnvAnimFinished); </code></pre> <p>// a "BlitSprite" is a class that I made. It looks like this:</p> <pre><code>package com.fs.util_j.blit_utils { import flash.display.BitmapData; import flash.events.Event; import flash.events.EventDispatcher; import flash.geom.Point; import flash.geom.Rectangle; public class BlitSprite extends EventDispatcher { private var _fullSpriteSheet:BitmapData; private var _rects:Array; private var _bitmapStage:BitmapData; private var pos:Point = new Point (); public var x:Number = 0; public var y:Number = 0; public var _animIndex: </code></pre> <p>int = 0; private var _count:int = 0;</p> <pre><code> public var animate:Boolean = true; private var _whiteTransparent:BitmapData; private var _envelopeAnimAry:Array; private var _model:Object; public function BlitSprite(fullSpriteSheet:BitmapData, envelopeAnimAry:Array, bitmapStage:BitmapData, model:Object = null) { _fullSpriteSheet = fullSpriteSheet; _envelopeAnimAry = envelopeAnimAry; _bitmapStage = bitmapStage; _model= model; init(); } private function init():void { // _whiteTransparent = new BitmapData(100, 100, true, 0x80FFffFF); this.addEventListener("ENV_ANIM_DONE", onEvnAnimDone); } protected function onEvnAnimDone(event:Event):void { } public function render():void { // pos.x = x - _rects[_animIndex].width*.5; // pos.y = y - _rects[_animIndex].width*.5; // if (_count % 1 == 0 &amp;&amp; animate == true) // { // trace("rendering"); if (_animIndex == (_envelopeAnimAry.length - 1) ) { // _animIndex = 0; dispatchEvent(new Event("ENV_ANIM_DONE", true)); animate = false; // trace("!!!!animate over " + _model.animOver); // if (_model != null) // { // _model.animOver = true; // } // trace("!!!!animate over " + _model.animOver); } else { _animIndex++; } pos.x = x + _envelopeAnimAry[_animIndex][1]; pos.y = y + _envelopeAnimAry[_animIndex][2]; _bitmapStage.copyPixels(_fullSpriteSheet, _envelopeAnimAry[_animIndex][0], pos, null, null, true); } } } // THIS PART HAPPENS WHEN PHONE'S SEND BUTTON IS CLICKED _envelopeBlit.animate = true; _envelopeBlit._animIndex = 0; _darkSquare.visible = true; _envelopePlayTimer.addEventListener(TimerEvent.TIMER, onEnterTimerFrame); _envelopePlayTimer.start(); </code></pre> <p>it also uses BlitConfig which stores the info about the spritesheet spit out by TexturePacker </p> <pre><code> package com.fs.pack.phone.configuration { import flash.geom.Rectangle; public final class BlitConfig { public static var _sending_message_real_20001:Rectangle = new Rectangle(300,1020,144,102); public static var _sending_message_real_20002:Rectangle = new Rectangle(452,1012,144,102); public static var _sending_message_real_20003:Rectangle = new Rectangle(852,852,146,102); public static var _sending_message_real_20004:Rectangle = new Rectangle(2,1018,146,102); public static var _sending_message_real_20005:Rectangle = new Rectangle(702,822,148,102); . . . public static var _sending_message_real_20139:Rectangle = new Rectangle(932,144,1,1); public static var envelopeAnimAry:Array = [ // rectangle, x offset, y offset [ _sending_message_real_20001, 184,155], [ _sending_message_real_20002, 184,155], [ _sending_message_real_20003, 183,155], [ _sending_message_real_20004, 183,155], . . . [ _sending_message_real_20139, 0,0] ] public function BlitConfig() { } } } </code></pre>
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