Transparent texture with Mipmap

Question

       Hi,  I have a problem about transparent texture with mipmap. In no-alpha channel texture it is correct.  Does anyone have the same problem as me?
This is my source code:
        function uploadTextureWithMipmaps( dest:ITexture, src:BitmapData ) :void
            var ws:int = src.width;
            var hs:int = src.height;
            var level:int = 0;
            var tmp:BitmapData;
            var transform:Matrix = new Matrix();
            var trans:Boolean = src.transparent;
            if ( trans )
                tmp = new BitmapData( src.width, src.height, true, 0x000000 );
            else
                tmp = new BitmapData( src.width, src.height );
            while ( ws >= 1 && hs >= 1 )
                if ( trans )
                    tmp.draw( src, transform, null, "alpha", null, true );   
                tmp.draw( src, transform, null, null, null, true );   
                dest.textureObj.uploadFromBitmapData( tmp, level );
                transform.scale( 0.5, 0.5 );
                level++;
                ws >>= 1;
                hs >>= 1;
            tmp.dispose();
I append the mipmap0, 1, 2  result to describe this situation. They are generated by a transparent texture after executing the upper function.     
mipmap0
mipmap1
mipmap2

Answer 1

You were close, but I have fixed your code for you.
public function uploadTextureWithMipmaps( dest:Texture, src:BitmapData ) :void
     var ws:int = src.width;
     var hs:int = src.height;
     var level:int = 0;
     var tmp:BitmapData;
     var transform:Matrix = new Matrix();
     var tmp2:BitmapData;
     tmp = new BitmapData( src.width, src.height, true, 0x00000000);
     while ( ws >= 1 && hs >= 1 )
          tmp.draw(src, transform, null, null, null, true);   
          dest.uploadFromBitmapData(tmp, level);
          transform.scale(0.5, 0.5);
          level++;
          ws >>= 1;
          hs >>= 1;
          if (hs && ws) {
               tmp.dispose();
               tmp = new BitmapData(ws, hs, true, 0x00000000);
     tmp.dispose();