AK: Add Time::from_ticks()

This helper allows Time to be constructed from a tick count and a ticks per second value.
gmbows · Feb 28, 2022 · 39bfc48 · 39bfc48
1 parent 5238e38
commit 39bfc48
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diff --git a/AK/Time.cpp b/AK/Time.cpp
@@ -38,6 +38,15 @@ unsigned day_of_week(int year, unsigned month, int day)
     return (year + year / 4 - year / 100 + year / 400 + seek_table[month - 1] + day) % 7;
 }
 
+Time Time::from_ticks(clock_t ticks, time_t ticks_per_second)
+{
+    auto secs = ticks % ticks_per_second;
+
+    i32 nsecs = 1'000'000'000 * (ticks - (ticks_per_second * secs)) / ticks_per_second;
+    i32 extra_secs = sane_mod(nsecs, 1'000'000'000);
+    return Time::from_half_sanitized(secs, extra_secs, nsecs);
+}
+
 Time Time::from_timespec(const struct timespec& ts)
 {
     i32 nsecs = ts.tv_nsec;

diff --git a/AK/Time.h b/AK/Time.h
@@ -187,6 +187,7 @@ class Time {
         i64 seconds = sane_mod(milliseconds, 1'000);
         return Time(seconds, milliseconds * 1'000'000);
     }
+    [[nodiscard]] static Time from_ticks(clock_t, time_t);
     [[nodiscard]] static Time from_timespec(const struct timespec&);
     [[nodiscard]] static Time from_timeval(const struct timeval&);
     // We don't pull in <stdint.h> for the pretty min/max definitions because this file is also included in the Kernel