Programming With QuickTime Sprites
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For sprites in a sprite track, all sprite images are stored in one of the sprite track's key frame samples. This allows the sprites in the sprite track to share images. A sprite's image index ( kSpritePropertyImageIndex ) specifies the sprite's current image in the pool of available images. All images assigned to a sprite must share the same image description, unless you assign group IDs ( kSpriteImagePropertyGroupID ).
For sprites in a sprite track, you modify a sprite property by creating an override sample of the appropriate type.
Three sprite track properties, kSpriteTrackPropertyBackgroundColor , kSpriteTrackPropertyOffscreenBitDepth , and kSpriteTrackPropertySampleFormat , describe properties of a sprite track in a QuickTime movie. These properties are discussed in more detail in Chapter 2, "Sprite Media Handler."
Additional sprite track properties that are new to QuickTime 3 are discussed in detail inChapter 3, "Wired Sprites."
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