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Optimize wl_fixed_t to/from double conversion functions

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This commit is contained in:
Kristian Høgsberg 2012-05-11 23:36:20 -04:00
parent fefa8c0fd5
commit f5df38959b
5 changed files with 211 additions and 12 deletions
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34
src/wayland-util.h
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@ -167,18 +167,32 @@ void *wl_array_add(struct wl_array *array, size_t size);
void wl_array_copy(struct wl_array *array, struct wl_array *source);
typedef int32_t wl_fixed_t;
#define WL_FIXED_INVALID_VALUE ~0L
static inline double wl_fixed_to_double(wl_fixed_t f)
static inline double
wl_fixed_to_double (wl_fixed_t f)
{
return (double) f / 256.0;
};
static inline wl_fixed_t wl_fixed_from_double(double d)
union {
double d;
int64_t i;
} u;
u.i = ((1023LL + 44LL) << 52) + (1LL << 51) + f;
return u.d - (3LL << 43);
}
static inline wl_fixed_t
wl_fixed_from_double(double d)
{
if (d >= (1 << 23))
return WL_FIXED_INVALID_VALUE;
return (wl_fixed_t) round (d * 256.0);
};
union {
double d;
int64_t i;
} u;
u.d = d + (3LL << (51 - 8));
return u.i;
}
static inline int wl_fixed_to_int(wl_fixed_t f)
{
@ -186,7 +200,7 @@ static inline int wl_fixed_to_int(wl_fixed_t f)
}
static inline wl_fixed_t wl_fixed_from_int(int i)
{
return wl_fixed_from_double(i);
return i * 256;
}
#ifdef __cplusplus