android - 不可变位图比可变位图更快吗？

Question

该类有一个带有以下签名Bitmap的方法：copy()

public Bitmap copy(Bitmap.Config config, boolean isMutable)

mutable 和 immutable 之间是否存在性能差异Bitmap？

score 8 · Accepted Answer

Romain Guy在评论中回答：

回答最初的问题：不，没有性能差异。不过，我们可以为可变位图实现一些优化。希望在未来的版本中:)

score 0 · Accepted Answer

没有性能差异。这不会影响您的应用程序的性能。如果您想执行任何操作，例如旋转等，那么我认为位图应该是可变的...

score -3 · Accepted Answer

On Application level, there is always a difference between immutable & mutable Bitmap resources.

You always get an immutable Bitmap from the resources. you need to convert them into mutable bitmap as per necessiti.

Bitmap Bitmap = BitmapFactory.decodeResource(....); Bitmap mutableBitmap = immutableBitmap.copy(Bitmap.Config.ARGB_8888, true);

So probably there must be a performance issue in this reference.

3 回答 3