创建旋转占位符渲染器实例 Create spinning placeholder renderer instance
渲染器选项 | Renderer options
释放所有缓存资源 Dispose all cached resources
移除指定 ID 的占位符并释放资源 Remove placeholder by ID and release resources
占位符唯一标识 | Placeholder unique identifier
渲染一帧占位符动画并返回位图 Render one frame of placeholder animation and return bitmap
占位符宽度（CSS 像素）| Placeholder width (CSS pixels)
占位符高度（CSS 像素）| Placeholder height (CSS pixels)
唯一标识（用于缓存动画状态）| Unique ID (for caching animation state)
当前帧的 ImageBitmap | Current frame ImageBitmap
旋转加载动画占位符渲染器 Spinning loader animation placeholder renderer
在图片加载过程中显示带有旋转圆点动画的占位图。 每个占位符独立管理动画状态和 Canvas 缓存。
Displays a placeholder with spinning dots animation during image loading. Each placeholder independently manages animation state and canvas cache.