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Chapter 13. Animation, Filters, and Draw... > About bitmap caching, scrolling, and...

About bitmap caching, scrolling, and performance

Flash Player 8 introduces bitmap caching, which helps you enhance the performance of nonchanging movie clips in your applications. When you set the MovieClip.cacheAsBitmap or Button.cacheAsBitmap property to true, Flash Player caches an internal bitmap representation of the movie clip or button instance. This can improve performance for movie clips that contain complex vector content. All of the vector data for a movie clip that has a cached bitmap is drawn to the bitmap, instead of to the main Stage.

Note

The bitmap is copied to the main Stage as unstretched, unrotated pixels snapped to the nearest pixel boundaries. Pixels are mapped one-to-one with the parent object. If the bounds of the bitmap change, the bitmap is re-created instead of being stretched.



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