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/** TickTracker.cc file for the fluxbox compositor. */
// Copyright (c) 2011 Gediminas Liktaras (gliktaras at gmail dot com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "TickTracker.hh"
#include "Logging.hh"
using namespace FbCompositor;
//--- CONSTANTS ----------------------------------------------------------------
// The accuracy of the timer (1.0 = 1 second).
const double EPSILON = 1e-6;
//--- CONSTRUCTORS AND DESTRUCTORS ---------------------------------------------
// Constructor.
TickTracker::TickTracker() {
m_is_running = false;
m_tick_size = 1000000;
m_ticks_per_second = 1.0;
}
// Copy constructor.
TickTracker::TickTracker(const TickTracker &other) :
m_is_running(other.m_is_running),
m_startTime(other.m_startTime),
m_tick_size(other.m_tick_size),
m_ticks_per_second(other.m_ticks_per_second),
m_observed_ticks(other.m_observed_ticks) {
}
// Assignment operator.
TickTracker &TickTracker::operator=(const TickTracker &other) {
if (this != &other) {
m_is_running = other.m_is_running;
m_startTime = other.m_startTime;
m_tick_size = other.m_tick_size;
m_ticks_per_second = other.m_ticks_per_second;
m_observed_ticks = other.m_observed_ticks;
}
return *this;
}
// Destructor.
TickTracker::~TickTracker() { }
//--- TIMER MANIPULATION -------------------------------------------------------
// Starts the timer.
void TickTracker::start() {
if (gettimeofday(&m_startTime, NULL)) {
throw TimeException("Cannot obtain the current time.");
}
m_observed_ticks = 0;
m_is_running = true;
}
/** Stops the timer. */
void TickTracker::stop() {
m_is_running = false;
}
//--- TIMER QUERIES ------------------------------------------------------------
// Returns the new number of elapsed ticks since last call of this function.
int TickTracker::newElapsedTicks() {
int total_ticks = totalElapsedTicks();
int new_ticks = total_ticks - m_observed_ticks;
m_observed_ticks = total_ticks;
if (new_ticks < 0) {
return 0;
} else {
return new_ticks;
}
}
// Returns the total number of elapsed ticks.
int TickTracker::totalElapsedTicks() {
static timeval now;
if (gettimeofday(&now, NULL)) {
throw TimeException("Cannot obtain the current time.");
}
return tickDifference(now, m_startTime);
}
// Sets the size of a tick.
void TickTracker::setTickSize(int usec) {
if (usec < 1) {
throw TimeException("Invalid tick size.");
}
m_tick_size = usec;
m_ticks_per_second = 1000000.0 / usec;
}
//--- INTERNAL FUNTIONS --------------------------------------------------------
// Returns the difference in time between two timevals.
// Function adapted from http://www.gnu.org/s/libc/manual/html_node/Elapsed-Time.html.
timeval TickTracker::timeDifference(timeval t1, timeval t2) {
int n_sec;
if (t1.tv_usec < t2.tv_usec) {
n_sec = (t2.tv_usec - t1.tv_usec) / 1000000 + 1;
t2.tv_usec -= 1000000 * n_sec;
t2.tv_sec += n_sec;
}
if (t1.tv_usec - t2.tv_usec > 1000000) {
n_sec = (t1.tv_usec - t2.tv_usec) / 1000000;
t2.tv_usec += 1000000 * n_sec;
t2.tv_sec -= n_sec;
}
timeval diff;
diff.tv_sec = t1.tv_sec - t2.tv_sec;
diff.tv_usec = t1.tv_usec - t2.tv_usec;
return diff;
}
// Returns the difference between two timevals in ticks.
int TickTracker::tickDifference(const timeval &t1, const timeval &t2) {
timeval diff = timeDifference(t1, t2);
double raw_diff = diff.tv_sec * m_ticks_per_second + (double(diff.tv_usec) / m_tick_size);
return int(raw_diff + EPSILON);
}
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