By default, Flash Player redraws each vector item on the Stage in every frame. Runtime bitmap caching lets you optimize playback performance by specifying that a static movie clip (for example, a background image) or button symbol be cached as a bitmap at runtime. Note: The Live Preview setting cannot be used with an ActionScript 3.0 document. If Enable Live Preview is turned on (Control > Enable Live Preview) when you scale instances of the movie clip on the Stage, you see the 9-slice scaling applied on the Stage. When a movie clip symbol has 9-slice scaling applied, it appears in the Library panel preview with the guides displayed. To maintain the visual integrity of the movie clip, corners are not scaled, while the remaining areas of the image are scaled (as opposed to being stretched) larger or smaller, as needed. The movie clip is visually divided into nine sections with a grid-like overlay, and each of the nine areas is scaled independently. This is often true of movie clips used as user interface elements, such as buttons. For many movie clips, this equal scaling can make the clip’s graphics look strange, especially at the corners and edges of rectangular movie clips. With normal scaling, Animate rofessional scales all parts of a movie clip equally, and in both the horizontal and vertical dimensions. With 9-slice scaling, you can ensure that the movie clip looks correct when scaled. 9-slice scaling allows you to specify how scaling is applied to specific areas of a movie clip.
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