code: public void addQuad (Texture tex, int tint, AffineTransform xf,
                         float x, float y, float w, float h) {
      setTexture(tex);
      float sr = tex.config.repeatX ? w/tex.displayWidth : 1;
      float sb = tex.config.repeatY ? h/tex.displayHeight : 1;
      addQuad(tint, xf, x, y, x+w, y+h, 0, 0, sr, sb);
    }
docs: Adds {@code tex} as a transformed axis-aligned quad to this batch.
  {@code x, y, w, h} define the size and position of the quad.