Starling2.x SuperTextureAtlas 扩展支持4096以上的纹理集图片

2019-11-08 20:22:40

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前言

在开发游戏过程中，经常遇到图片达到4096的尺寸，如果去修改这个纹理集合分配成2048的话，会浪费不少的人力。所以，扩展了一个SuperTextureAtlas来支持大于4096的纹理集图片。

实现原理

其实原理很简单，也就是解析位图的大小，将超过尺寸的大图，切割成一个个2048的精灵表TextureAtlas。而SuperTextureAtlas正是重写了其获取方法，管理读取多个精灵表，所以能照常使用。此外，为了实现这个功能，特意修改了AssetsManager类的几个小地方。

SuperTextureAtlas.as源码

package zygame.utils{ import Flash.display.BitmapData; import flash.geom.Point; import flash.geom.Rectangle; import flash.system.System; import starling.textures.Texture; import starling.textures.TextureAtlas; public class SuperTextureAtlas extends TextureAtlas { /** * Whether to start support, the default is false */ public static var support:Boolean = false; PRivate var _maxPack:Vector.<Object>; private var _textureAtlas:Vector.<TextureAtlas>; private var _separationCount:int = 0; private var _separationIndex:int = 0; private var _bitmapData:BitmapData; private var _xml:XMLList; private var _length:int = 0; private var _count:int = 0; public function SuperTextureAtlas(bitmapData:BitmapData,xml:XML):void { _bitmapData = bitmapData; _xml = xml.children(); _length = _xml.length(); _textureAtlas = new Vector.<TextureAtlas>(); _maxPack = new Vector.<Object>(); _separationCount = 1; while(_maxPack.length < _separationCount){ _maxPack.push(separation()); } super(Texture.fromBitmapData(_maxPack[0].bitmapData),_maxPack[0].xml); for(var c:int = 0;c<_maxPack.length;c++) { if(c != 0) { var textureAtlas:TextureAtlas = new TextureAtlas(Texture.fromBitmapData(_maxPack[c].bitmapData),_maxPack[c].xml); _textureAtlas.push(textureAtlas); } } _bitmapData = null; } /** * Isolations, separate the texture set one by one, back together * @return * */ private function separation():Object { var bitmapData:BitmapData = new BitmapData(2048,2048,true,0x0); var pack:MaxRectsBinPack = new MaxRectsBinPack(2048,2048,false); for(var i:int = _separationIndex;i<_length;i++) { var rect:Rectangle = pack.insert(int(_xml[i].@width),int(_xml[i].@height),2); _count ++; if(rect.width == 0 || rect.height == 0) { _separationCount ++; break; } } var newXML:XML = <xml></xml>; for(var u:int = 0;u<pack.usedRectangles.length;u++) { bitmapData.copyPixels(_bitmapData,new Rectangle(int(_xml[_separationIndex+u].@x),int(_xml[_separationIndex+u].@y),int(_xml[_separationIndex+u].@width),int(_xml[_separationIndex+u].@height)),new Point(pack.usedRectangles[u].x,pack.usedRectangles[u].y)); var nodeXML:XML = _xml[_separationIndex+u].copy(); nodeXML.@x = pack.usedRectangles[u].x; nodeXML.@y = pack.usedRectangles[u].y; newXML.appendChild(nodeXML); } _separationIndex = i; return { bitmapData:bitmapData, xml:newXML }; } override public function getTexture(name:String):Texture { var texture:Texture = super.getTexture(name); if(texture) return texture; for(var i:int = 0;i<_textureAtlas.length;i++) { texture = _textureAtlas[i].getTexture(name); if(texture) return texture; } return null; } override public function getFrame(name:String):Rectangle { var rect:Rectangle = super.getFrame(name); if(rect) return rect; for(var i:int = 0;i<_textureAtlas.length;i++) { rect = _textureAtlas[i].getFrame(name); if(rect) return rect; } return null; } override public function getRegion(name:String):Rectangle { var rect:Rectangle = super.getRegion(name); if(rect) return rect; for(var i:int = 0;i<_textureAtlas.length;i++) { rect = _textureAtlas[i].getRegion(name); if(rect) return rect; } return null; } override public function getRotation(name:String):Boolean { var bool:Boolean = super.getRotation(name); if(bool) return true; for(var i:int = 0;i<_textureAtlas.length;i++) { bool = _textureAtlas[i].getRegion(name); if(bool) return true; } return false; } override public function getNames(prefix:String="", out:Vector.<String>=null):Vector.<String> { var vec:Vector.<String> = super.getNames(prefix,out); if(vec) return vec; for(var i:int = 0;i<_textureAtlas.length;i++) { vec = _textureAtlas[i].getNames(prefix,out); if(vec) return vec; } return null; } override public function getTextures(prefix:String="", out:Vector.<Texture>=null):Vector.<Texture> { var vec:Vector.<Texture> = super.getTextures(prefix,out); if(vec) return vec; for(var i:int = 0;i<_textureAtlas.length;i++) { vec = _textureAtlas[i].getTextures(prefix,out); if(vec) return vec; } return null; } override public function dispose():void { for(var c:int = 0;c<_textureAtlas.length;c++) { _textureAtlas[c].dispose(); } for(var i:int = 0;i<_maxPack.length;i++) { (_maxPack[i].bitmapData as BitmapData).dispose(); System.disposeXML((_maxPack[i].xml as XML)); } _maxPack.splice(0,_maxPack.length); _maxPack = null; } }}

以上是实现原理，所有涉及源码晚些我放在CSND下载区。

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