jpegencoder.swc 来自 http://last.instinct.se/graphics-and-effects/using-the-fast-asynchronous-alchemy-jpeg-encoder-in-flash/640

Question

有人在flashbuilder 4.5.1中成功使用过这个编码器吗？ 我收到这个错误？？？通常在加载第二张图片时。任何帮助表示赞赏。

RangeError: Error #1506: The specified range is invalid. 
at cmodule.aircall::FSM_imalloc$/start() 
at cmodule.aircall::FSM_pubrealloc/work() 
at cmodule.aircall::CRunner/work() 
at Function/<anonymous>() 
at flash.utils::Timer/_timerDispatch() 
at flash.utils::Timer/tick() 

我的代码如下：

private var im:img; 
private var jpgStream:ByteArray; 
private var jpeglib:Object; 
private var jpeginit:CLibInit = new CLibInit(); // get library 

public function save_image(_im:img, pg:Number):void 
{ 
     var bm:BitmapData = Bitmap(_im.getChildAt(0)).bitmapData; 
     im = _im; 

     var imgData:ByteArray = bm.getPixels(bm.rect); 
     jpgStream = new ByteArray(); 
     imgData.position = 0; 

     trace(bm == null); 
     var jpegQuality:Number = 40; 

     if (!jpeglib) { 
          jpeglib=jpeginit.init(); 
     } 
     jpeglib.encodeAsync(encodeComplete, imgData, jpgStream, bm.width, bm.height, jpegQuality); 
} 

private function encodeComplete(e:Event):void { 
     trace("Encoding complete"); 

     file = File.documentsDirectory.resolvePath("Pic-A-Note/" + albumName + "/object_layer_" + im.name + ".pn"); 
     fs.open(file, FileMode.WRITE); 
     fs.writeBytes(jpgStream,0); 
     fs.close(); 
}

Answer 1

问题是您正在初始化 CLibInit 两次。我创建了一个自定义类来使用 jpegencoder.swc 透明地处理 jpg 的编码，就像您对本机类所做的那样。

public class JPGAlchemyEncoder {

    private static var alchemyWrapper:Object;
    private var quality:Number;

    public function JPGAlchemyEncoder(quality:Number) {
        this.quality = quality;
        if (!alchemyWrapper){
            var loader:CLibInit = new CLibInit;
            alchemyWrapper = loader.init();
        }
    }

    public function encode(bitmapData:BitmapData):ByteArray{
        var data: ByteArray = bitmapData.clone().getPixels( bitmapData.rect );
        data.position = 0;
        return alchemyWrapper.write_jpeg_file(data, bitmapData.width, bitmapData.height, 3, 2, quality);
    }

    public function encodeAsync(bitmapData:BitmapData, completeHandler:Function):void{
        var encodedData:ByteArray = new ByteArray();
        var data: ByteArray = bitmapData.clone().getPixels(bitmapData.rect);
        data.position = 0;
        var encodeComplete:Function = function():void{
            completeHandler(encodedData);
        };
        alchemyWrapper.encodeAsync(encodeComplete, data, encodedData, bitmapData.width, bitmapData.height, quality);
    }
}
}

检查构造函数如何处理静态 CLib。这样您就可以根据需要启动任意数量的 JPGAlchemyEncoder，但 CLib 将仅初始化一次，从而解决您的问题。

Answer 2

没有使用过那个 swc，但是 AS3Corelib 中的非 alchemy jpeg 编码器也可以完成这项工作（没有任何错误，我可能会补充）
http://code.google.com/p/as3corelib/