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common: add macro for checking whether a value is a power of two 

I think I repeated this inline in some places (or maybe not), and some
experimental but discarded code used it. Add it anyway, maybe it'll be
useful. Or it'll give someone a chance to get a contribution into mpv by
removing an unused macro.
This commit is contained in:
wm4 2019-06-16 18:22:45 +02:00
parent 4291329d56
commit 56f09fa03d
1 changed files with 1 additions and 0 deletions
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common/common.h
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@ -44,6 +44,7 @@
#define MP_ALIGN_UP(x, align) (((x) + (align) - 1) & ~((align) - 1))
#define MP_ALIGN_DOWN(x, align) ((x) & ~((align) - 1))
#define MP_IS_ALIGNED(x, align) (!((x) & ((align) - 1)))
#define MP_IS_POWER_OF_2(x) ((x) > 0 && !((x) & ((x) - 1)))
// Return "a", or if that is NOPTS, return "def".
#define MP_PTS_OR_DEF(a, def) ((a) == MP_NOPTS_VALUE ? (def) : (a))