因此，要注意的是一定要确保画布对象已经全部渲染到屏幕上；否则输出文件将是空的。

Therefore, take care that the Canvas object in fact has been rendered to the screen; otherwise the output file will be empty.

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函数update()用于（在任何部件上）强制渲染并且等待所有进行的事件全部完成。

The update() function can be used (on any widget) to force rendering and to wait until all pending events have been processed.

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在iOS设备中，全部的GPU正使用基于平铺的延迟渲染结构。

All GPUs in iOS devices are using Tile-Based Deferred Rendering architecture.

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在iOS设备中，全部的GPU正使用基于平铺的延迟渲染结构。

All GPUs in iOS devices are using Tile-Based Deferred Rendering architecture.

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