time: Add cairo_time_t type

Add the cairo_time_t type (currently based on cairo_uint64_t) and use
it in cairo-observer and in the perf suite.

Fixes the build on MacOS X (for the src/ subdir) and Win32, whch
failed because they don't provide clock_gettime:

cairo-surface-observer.c:629: error: implicit declaration of function 'clock_gettime'
cairo-surface-observer.c:629: warning: nested extern declaration of 'clock_gettime'
cairo-surface-observer.c:629: error: 'CLOCK_MONOTONIC' undeclared (first use in this function)
...

1 files changed, 16 insertions, 0 deletions

diff --git a/src/cairo-wideint.c b/src/cairo-wideint.c
index 78dedcdf0..b6e22808d 100644
--- a/src/cairo-wideint.c
+++ b/src/cairo-wideint.c
@@ -84,6 +84,22 @@ uint64_shift32 (cairo_uint64_t i)
 static const cairo_uint64_t uint64_carry32 = { 0, 1 };
 
 cairo_uint64_t
+_cairo_double_to_uint64 (double i)
+{
+    cairo_uint64_t	q;
+
+    q.hi = i * (1. / 4294967296.);
+    q.lo = i - q.hi * 4294967296.;
+    return q;
+}
+
+double
+_cairo_uint64_to_double (cairo_uint64_t i)
+{
+    return i.hi * 4294967296. + i.lo;
+}
+
+cairo_uint64_t
 _cairo_uint32_to_uint64 (uint32_t i)
 {
     cairo_uint64_t	q;