From 1f1556998546e7cfe3b38fab00a70a948c35bcc0 Mon Sep 17 00:00:00 2001
From: nyamatongwe <unknown>
Date: Thu, 15 Nov 2001 00:50:13 +0000
Subject: Added ElapsedTime.

---
 gtk/PlatGTK.cxx   | 40 ++++++++++++++++++++++++++++++++++++++++
 win32/PlatWin.cxx | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)

diff --git a/gtk/PlatGTK.cxx b/gtk/PlatGTK.cxx
index 34a33f581..7ecd1cbee 100644
--- a/gtk/PlatGTK.cxx
+++ b/gtk/PlatGTK.cxx
@@ -886,6 +886,46 @@ void Menu::Show(Point pt, Window &) {
 	gtk_item_factory_popup(reinterpret_cast<GtkItemFactory *>(id), pt.x - 4, pt.y, 3, 0);
 }
 
+static double DoublePack(glong a, glong b) {
+	double d;
+	long *lp = reinterpret_cast<glong *>(&d);
+	lp[0] = a;
+	lp[1] = b;
+	return d;
+}
+
+static void DoubleUnpack(double d, glong &a, glong &b) {
+	long *lp = reinterpret_cast<glong *>(&d);
+	a = lp[0];
+	b = lp[1];
+}
+
+static double Now() {
+	GTimeVal curTime;
+	g_get_current_time(&curTime);
+	return DoublePack(curTime.tv_sec, curTime.tv_usec);
+}
+
+ElapsedTime::ElapsedTime() {
+	beginTime = Now();
+}
+
+double ElapsedTime::Duration(bool reset) {
+	double endTime = Now();
+	GTimeVal tvStart;
+	DoubleUnpack(beginTime, tvStart.tv_sec, tvStart.tv_usec);
+	GTimeVal tvEnd;
+	DoubleUnpack(endTime, tvEnd.tv_sec, tvEnd.tv_usec);
+	double result = tvEnd.tv_sec - tvStart.tv_sec;
+	result *= 1000000;
+	result += tvEnd.tv_usec - tvStart.tv_usec;
+	result /= 1000000;
+	if (reset) {
+		beginTime = endTime;
+	}
+	return result;
+}
+
 ColourDesired Platform::Chrome() {
 	return ColourDesired(0xe0, 0xe0, 0xe0);
 }
diff --git a/win32/PlatWin.cxx b/win32/PlatWin.cxx
index 666c962cf..d227aa7a1 100644
--- a/win32/PlatWin.cxx
+++ b/win32/PlatWin.cxx
@@ -10,6 +10,7 @@
 #include <ctype.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <time.h>
 
 #define _WIN32_WINNT  0x0400
 #include <windows.h>
@@ -872,6 +873,46 @@ void Menu::Show(Point pt, Window &w) {
 	Destroy();
 }
 
+static bool initialisedET = false;
+static bool usePerformanceCounter = false;
+static LARGE_INTEGER frequency;
+
+static double Now() {
+	if (usePerformanceCounter) {
+		LARGE_INTEGER timeVal;
+		::QueryPerformanceCounter(&timeVal);
+		return *(reinterpret_cast<double *>(&timeVal));
+	} else {
+		return clock();
+	}
+}
+
+ElapsedTime::ElapsedTime() {
+	if (!initialisedET) {
+		usePerformanceCounter = ::QueryPerformanceFrequency(&frequency);
+		initialisedET = true;
+	}
+	beginTime = Now();
+}
+
+double ElapsedTime::Duration(bool reset) {
+	double endTime = Now();
+	double result;
+	if (usePerformanceCounter) {
+		LARGE_INTEGER lBegin = *(reinterpret_cast<LARGE_INTEGER *>(&beginTime));
+		LARGE_INTEGER lEnd = *(reinterpret_cast<LARGE_INTEGER *>(&endTime));
+		double elapsed = lEnd.QuadPart - lBegin.QuadPart;
+		result = elapsed / static_cast<double>(frequency.QuadPart);
+	} else {
+		double elapsed = endTime - beginTime;
+		result = elapsed / CLOCKS_PER_SEC;
+	}
+	if (reset) {
+		beginTime = endTime;
+	}
+	return result;
+}
+
 ColourDesired Platform::Chrome() {
 	return ::GetSysColor(COLOR_3DFACE);
 }
-- 
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