class TextureAtlasFrame {

 final TextureAtlas _textureAtlas;
 final String _name;
 final bool _rotated;

 final int _originalWidth;
 final int _originalHeight;
 final int _offsetX;
 final int _offsetY;

 final int _frameX;
 final int _frameY;
 final int _frameWidth;
 final int _frameHeight;

 TextureAtlasFrame.fromJson(TextureAtlas textureAtlas, String name, Map frame) :
   _textureAtlas = textureAtlas,
   _name = name,
   _rotated = _ensureBool(frame["rotated"]),
   _originalWidth = _ensureInt(frame["sourceSize"]["w"]),
   _originalHeight = _ensureInt(frame["sourceSize"]["h"]),
   _offsetX = _ensureInt(frame["spriteSourceSize"]["x"]),
   _offsetY = _ensureInt(frame["spriteSourceSize"]["y"]),
   _frameX = _ensureInt(frame["frame"]["x"]),
   _frameY = _ensureInt(frame["frame"]["y"]),
   _frameWidth = _ensureInt(frame["frame"]["w"]),
   _frameHeight = _ensureInt(frame["frame"]["h"]);

 //-------------------------------------------------------------------------------------------------

 TextureAtlas get textureAtlas => _textureAtlas;
 String get name => _name;
 bool get rotated => _rotated;

 int get frameX => _frameX;
 int get frameY => _frameY;
 int get frameWidth => _frameWidth;
 int get frameHeight => _frameHeight;

 int get offsetX => _offsetX;
 int get offsetY => _offsetY;
 int get originalWidth => _originalWidth;
 int get originalHeight => _originalHeight;

 //-------------------------------------------------------------------------------------------------

 BitmapData getBitmapData() {

   var renderTexture = _textureAtlas.renderTexture;
   var renderTextureQuad = new RenderTextureQuad(renderTexture,
       _rotated ? 1 : 0, _offsetX, _offsetY,
       _rotated ? _frameX + _frameHeight : _frameX, _frameY, _frameWidth, _frameHeight);

   return new BitmapData.fromRenderTextureQuad(renderTextureQuad, _originalWidth, _originalHeight);
 }

}