Is flash smart enough to “hide” PIXELS that aren’t on the stage, in order to decrease memory usage? Or I must do it manually, if it decreases the memory usage at all?
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Is flash smart enough to “hide” PIXELS that aren’t on the stage, in order to decrease memory usage? Or I must do it manually, if it decreases the memory usage at all?
Flash does not render objects that aren’t on the stage (as per http://help.adobe.com/en_US/as3/dev/WS5b3ccc516d4fbf351e63e3d118a9b90204-7e3e.html).
However I think you may be mixing up two different issues.
One issue is CPU/GPU performance – for this there is no need to worry about off-stage objects as Flash does not waste time rendering display objects that are outside the stage bounds.
The other issue is memory usage. Every object that you create takes up some memory whether or not it is visible on the screen. Flash has a garbage collector that will periodically dispose of unused objects, however “unused objects” means an object that isn’t referenced by any other object so if you are having memory issues you will have to manually clean up objects by removing event listeners, nulling references etc.