fbcompose - A compositing addon for fluxbox window manager.

 fbcompose(1) is an optional compositing addon for fluxbox window manager. It
 augments fluxbox with a number of graphical features. Most notably, fbcompose
 allows fluxbox to properly display applications that require compositing
 (docky, for example), adds support for true window transparency (as opposed to
 fluxbox's pseudo transparency) and provides a plugin framework to extend the
 compositor's functionality.

 As this is still a beta version of the compositor, the bugs are likely.

1 files changed, 156 insertions, 0 deletions

diff --git a/util/fbcompose/TickTracker.cc b/util/fbcompose/TickTracker.cc
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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);
+}