void updateLevel()
	{
		TTool::Application *app = TTool::getApplication();
		if (!app->getCurrentLevel()->getLevel())
			return;
		TXshSimpleLevelP xl = app->getCurrentLevel()->getLevel()->getSimpleLevel();
		if (app->getCurrentFrame()->getFrameType() != TFrameHandle::LevelFrame)
			return;

		TFrameId fid = app->getCurrentFrame()->getFid();
		TVectorImageP src = xl->getFrame(fid, true);
		int count = src->getStrokeCount();

		for (int i = 1; i < 10; i++) {
			++fid;
			if (!xl->isFid(fid)) {
				TVectorImageP vi = new TVectorImage();
				xl->setFrame(fid, vi);
			}
			TVectorImageP vi = xl->getFrame(fid, true);
			TVectorImageP dst = src->clone();
			deform(dst.getPointer(), src.getPointer(), (double)i / (double)9);
			count = dst->getStrokeCount();
			vi->mergeImage(dst, TAffine());
			app->getCurrentTool()->getTool()->notifyImageChanged(fid);
		}
	}
QString ImageBuilder::add(const TImageP &img, const TAffine &aff) {
  if (fabs(aff.det()) < 0.001) return "";
  if (m_img && (m_img->getType() != img->getType()))
    return "Image type mismatch";

  if (!m_img && img->getType() != TImage::VECTOR && m_width > 0 &&
      m_height > 0) {
    TRasterP ras = img->raster()->create(m_width, m_height);
    if (img->getType() == TImage::RASTER)
      m_img = TRasterImageP(ras);
    else if (img->getType() == TImage::TOONZ_RASTER) {
      m_img = TToonzImageP(ras, ras->getBounds());
      m_img->setPalette(img->getPalette());
    } else
      return "Bad image type";
  }

  if (!m_img && aff.isIdentity()) {
    m_img = img->cloneImage();
  } else if (img->getType() == TImage::VECTOR) {
    // vector image
    if (!m_img) {
      // transform
      TVectorImageP vi = img->cloneImage();
      vi->transform(aff);
      m_img = vi;
    } else {
      // merge
      TVectorImageP up = img;
      TVectorImageP dn = m_img;
      dn->mergeImage(up, aff);
    }
  } else {
    if (img->getType() != TImage::TOONZ_RASTER &&
        img->getType() != TImage::RASTER) {
      // this should not ever happen
      return "Bad image type";
    }
    TRasterP up = img->raster();
    if (!m_img) {
      // create an empty bg
      TRasterP ras = up->create();
      ras->clear();
      if (img->getType() == TImage::TOONZ_RASTER) {
        TRasterCM32P rasCm = ras;
        m_img              = TToonzImageP(rasCm,
                             TRect(0, 0, ras->getLx() - 1, ras->getLy() - 1));
        m_img->setPalette(img->getPalette());
      } else {
        m_img = TRasterImageP(ras);
      }
    }
    TRasterP dn = m_img->raster();
    if (aff.isTranslation() && aff.a13 == floor(aff.a13) &&
        aff.a23 == floor(aff.a23)) {
      // just a integer coord translation
      TPoint delta = -up->getCenter() + dn->getCenter() +
                     TPoint((int)aff.a13, (int)aff.a23);
      TRop::over(dn, up, delta);
    } else {
      TAffine aff1 = TTranslation(dn->getCenterD()) * aff *
                     TTranslation(-up->getCenterD());
      TRop::over(dn, up, aff1, TRop::Mitchell);
    }
  }
  return "";
}