* 1. Created by SvgVisual in the main thread
* 2. Queued in the worked thread waiting to be processed.
* 3. If this task gets its turn to do the rasterization, it triggers main thread to apply the rasterized image to material then been deleted in main thread call back
* 1. Created by SvgVisual in the main thread
* 2. Queued in the worked thread waiting to be processed.
* 3. If this task gets its turn to do the rasterization, it triggers main thread to apply the rasterized image to material then been deleted in main thread call back