What’s concept of off-screen bitmap , and how can we introduce this concept in Android?
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What’s concept of off-screen bitmap , and how can we introduce this concept in Android?
Off-screen rendering is a cheap form of double-buffering, and ensures that what is displayed on-screen is always a complete image – as opposed to one that is only partially finished drawing. It involves drawing data to a canvas that is not visible on-screen, and only once rendering is complete is it actually presented to the user, typically by blitting it to part of the screen that is visible.
It can also be used as an optimisation, by blitting pixel data from off- to on-screen in order to avoid redrawing the entire bitmap.