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Add support for signed 24.8 decimal numbers

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'fixed' is a signed decimal type which offers a sign bit, 23 bits of
integer precision, and 8 bits of decimal precision.  This is exposed as
an opaque struct with conversion helpers to and from double and int on
the C API side.

Signed-off-by: Daniel Stone <daniel@fooishbar.org>
This commit is contained in:
Daniel Stone 2012-05-08 17:17:25 +01:00 • committed by Kristian Høgsberg
parent c49f632dae
commit c5aba11acc
6 changed files with 81 additions and 3 deletions
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24
src/wayland-util.h
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@ -27,6 +27,7 @@
extern "C" {
#endif
#include <math.h>
#include <stddef.h>
#include <inttypes.h>
@ -165,6 +166,29 @@ void wl_array_release(struct wl_array *array);
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)
{
return (double) f / 256.0;
};
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);
};
static inline int wl_fixed_to_int(wl_fixed_t f)
{
return f / 256;
}
static inline wl_fixed_t wl_fixed_from_int(int i)
{
return wl_fixed_from_double(i);
}
#ifdef __cplusplus
}
#endif