drawCoverImage() {
    const { display } = this;
    const [width, height] = this.getWH();
    const frame = this.materials.getSourceRect(width, height);
    const texture = new Texture(new BaseTexture(), frame);

    display.texture = texture;
    display.attr({ width, height });
    display.setScaleToInit();

    this.drawing();
  }
draw the first cover image
@private