纯 AS3 将图片转换为 SWF(转自同行“古树悬叶”的博客)

package
{
???? import?flash.display.Bitmap;
???? import?flash.display.BitmapData;
???? import?flash.display.JPEGEncoderOptions;
???? import?flash.display.Loader;
???? import?flash.display.LoaderInfo;
???? import?flash.display.Sprite;
???? import?flash.events.Event;
???? import?flash.net.FileReference;
???? import?flash.net.URLRequest;
???? import?flash.utils.ByteArray;
???? import?flash.utils.Endian;

???? public? class?Image2Swf? extends?Sprite
???? {
???????? private? var?isCompress :Boolean? =?true; //是否为压缩格式的SWF

???????? private? var?loader :Loader;
???????? private? var?bitmapData :BitmapData;

???????? public? function?Image2Swf ( )
???????? {
????????????loader? =? new?Loader ( );
????????????loader.contentLoaderInfo.addEventListener (Event.INIT,initHandler );
????????????loader.load ( new?URLRequest ( "test.jpg" ) );
???????? }

???????? private? function?initHandler (e :Event ) : void
???????? {
????????????e.target.removeEventListener (Event.INIT,initHandler );

???????????? var?bitmap :Bitmap? =?e.target.content as Bitmap;

???????????? if (bitmap )
???????????? {
????????????????bitmapData? =?bitmap.bitmapData;

???????????????? var?byteArray :ByteArray? =? new?ByteArray ( );

????????????????bitmapData.encode (bitmapData.rect,? new?JPEGEncoderOptions ( ),byteArray );?

????????????????loader? =?null;
????????????????loader? =? new?Loader ( );
????????????????loader.contentLoaderInfo.addEventListener (?Event.COMPLETE,completeHandler? );
????????????????loader.loadBytes (byteArray );????????
???????????? }
???????? }

???????? private? function?completeHandler (e :Event ) : void
???????? {
????????????e.target.removeEventListener (?Event.COMPLETE,completeHandler? );

???????????? if (isCompress )
???????????? {
???????????????? //保存为压缩格式的SWF
????????????????saveContentToSWF_compress (?e? );
???????????? }
???????????? else
???????????? {
???????????????? //保存为非压缩格式的SWF
????????????????saveContentToSWF (?e? );
???????????? }
????????????loader.unload ( );
????????????loader? =?null;
????????????bitmapData.dispose ( );
????????????bitmapData? =?null;
???????? }

???????? //压缩格式
???????? private? function?saveContentToSWF_compress (?e :Event? ) : void
???????? {
???????????? var?swf_head :ByteArray? =? new?ByteArray ( );
????????????????swf_head.endian? =?Endian.LITTLE_ENDIAN;
????????????????swf_head.writeBytes ( (e.target as LoaderInfo ).bytes,? 0,? 8? );
????????????????swf_head [ 0 ]? =?0x43;? // 'C';?
????????????????swf_head.position? =? 0;

???????????? var?swf_body :ByteArray? =? new?ByteArray ( );
????????????????swf_body.endian? =?Endian.LITTLE_ENDIAN;
????????????????swf_body.writeBytes ( (e.target as LoaderInfo ).bytes,? 8? );
????????????????swf_body.position? =? 0;
????????????????swf_body.compress ( );
????????????????swf_body.position? =? 0;

???????????? var?swf_ByteArray :ByteArray? =? new?ByteArray ( ); //包含 head 与 body 的二进制

????????????????swf_ByteArray.writeBytes (swf_head );
????????????????swf_ByteArray.writeBytes (swf_body );

???????????? var?file :FileReference? =? new?FileReference ( );
????????????????file.save (swf_ByteArray,? "压格式的SWF.swf" ); //SWF head CWS
???????? }

???????? //非压缩格式
???????? private? function?saveContentToSWF (?e :Event? ) : void
???????? {
???????????? var?file :FileReference? =? new?FileReference ( );
????????????????file.save ( (e.target as LoaderInfo ).bytes,? "非压格式的SWF.swf" ); //SWF head 为FWS
???????? }
???? }
}