QTimerInfo: use chrono for time intervals

For VeryCoarseTimer:
   - The code used to convert QTimerInfo::interval to seconds in
     registerTimer(), then convert to milliseconds when creating
     QTimerInfo in registeredTimers(); this is a bit confusing as
     "interval" was sometimes milliseconds and sometimes seconds
     depending on the type of the timer; instead "round" to the nearest
     second while always keeping "interval" in milliseconds (relying on
     chrono doing the conversion)..
   - Add roundToSecs() helper; it behaves like the original code (i.e.
     rounding each 500ms to 1 full second):
   const auto list = {300, 499, 500, 600, 1000, 1300, 1499, 1500, 1501,
                      1600, 2000, 2300, 2499, 2500, 2600};
   using namespace std::chrono;
   for (int dur : list) {
       auto i = dur;
       i /= 500; i += 1; i >>= 1; // Original code

       milliseconds msec{dur};
       seconds secs = duration_cast<seconds>(msec);
       milliseconds frac = msec - secs;
       if (frac >= 500ms)
          secs += 1s;

       assert(i == secs.count());
   }
----

- Don't mix signed and unsigned when doing arithmetic

The next "chrono-first" step would be changing
QAbstractEventDispatcher::TimerInfo::interval from int to
chrono::milliseconds, and adding a virtual
QAbstractEventDispatcher::registerTimer() overload that takes
chrono::milliseconds; neither can be done until Qt7 due to binary
compatibility constraints, c.f.:
https://community.kde.org/Policies/Binary_Compatibility_Issues_With_C++

Task-number: QTBUG-110059
Change-Id: I36f9bd8fb29565b1131afb3cdfc313452f625598
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/corelib/kernel/qeventdispatcher_glib.cpp b/src/corelib/kernel/qeventdispatcher_glib.cpp
index c644dd35d8..eeb175c374 100644
--- a/src/corelib/kernel/qeventdispatcher_glib.cpp
+++ b/src/corelib/kernel/qeventdispatcher_glib.cpp
@@ -489,7 +489,8 @@ void QEventDispatcherGlib::registerTimer(int timerId, qint64 interval, Qt::Timer
 #endif
 
     Q_D(QEventDispatcherGlib);
-    d->timerSource->timerList.registerTimer(timerId, interval, timerType, object);
+    d->timerSource->timerList.registerTimer(timerId, std::chrono::milliseconds{ interval },
+                                            timerType, object);
 }
 
 bool QEventDispatcherGlib::unregisterTimer(int timerId)