While I was writing the Bitmap Programming chapter of my book, I wanted to write something about vectors rasterizing.
As you may know, the cacheAsBitmap property introduced in the Flash Player 8 and available in AS3 through the DisplayObject.cacheAsBitmap property must be used when DisplayObjects are being moved ONLY. If you apply any other transformation, the bitmap version of the DisplayObject gets updated in memory for each transformation made , this results in an quite high CPU occupancy rate.
Worse than that, if you apply a filter to a DisplayObject, the Flash Player caches it automatically and creates 2 bitmaps in memory : One to work with pixels and another one to generate the filtered result. This time, for each transformation made to the DisplayObject, the two bitmaps previously generated are updated in memory. This time, your CPU occupancy rate is gonna go crazy.
To see traditional animations with MovieClip's and filters check this page and have a look at you CPU occupancy.
Now, I would like to introduce the "Banana Slice" component.
Banana Slice, is a tiny component that you can drag and drop and assign a specific MovieClip. At runtime, the component rasterizes the whole MovieClip and replaces its content by an animated bitmap. Of course, the MovieClip methods can still be called on it, everything is totally transparent (especially cool for non-coders).
By using this technique, you get better performance, each MovieClip can have its own frame rate as I am using an internal Timer object to play frames. Another cool thing is that you can set you Stage.quality to StageQuality.LOW once bitmap frames are generated, you will still get an anti-alias animation.
The SWF below is using the Banana Slice component with a single MovieClip and a few filters, your CPU occupancy should be ok now
Sources will be posted very soon, as soon as I get more time to clean some parts of the code
I'd like to thank Mama from yamago for the original idea