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/* ============================================================
*
* This file is a part of kipi-plugins project
* http://www.kipi-plugins.org
*
* Date : 2007-11-14
* Description : a kipi plugin to slide images.
*
* Copyright (C) 2007 by Valerio Fuoglio <valerio dot fuoglio at gmail dot com>
*
* Parts of this code are based on smoothslidesaver by Carsten Weinhold
* <carsten dot weinhold at gmx dot de>
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software Foundation;
* either version 2, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* ============================================================ */
// TQt includes.
#include <tqapplication.h>
// X11 includes.
#include <X11/Xlib.h>
#include <X11/extensions/Xrandr.h>
// Local includes.
#include "screenproperties.h"
namespace KIPISlideShowPlugin
{
ScreenProperties::ScreenProperties(TQWidget *mainWidget) {
activeScreen = TQApplication::desktop()->screenNumber(mainWidget);
}
unsigned ScreenProperties::suggestFrameRate() {
int eventBase, errorBase;
if ( !XRRQueryExtension(qt_xdisplay(), &eventBase, &errorBase)) {
// No information, make a lucky guess on based on that ;)
return 25;
}
// ask X11 for the refresh rate of the current screen
XRRScreenConfiguration* config;
int screenRate;
config = XRRGetScreenInfo(qt_xdisplay(), RootWindow(qt_xdisplay(),
activeScreen));
screenRate = XRRConfigCurrentRate(config);
XRRFreeScreenConfigInfo(config);
//tqDebug("monitor refresh rate %d Hz", screenRate);
// Find the frame rate, that matches the monitor's refresh rate best.
// We will choose between 25, 28 and 30 Hz, to get smooth animations.
// The following frame rate will be chosen according to the monitor's
// refresh rate:
//
// Frame rate: Monitor refresh rate
// 25 Hz (50), 75, 100 Hz (PAL compliant setups)
// 28 Hz 85 Hz, 110 Hz (seems to work ok)
// 30 Hz 60, 90, 120 Hz (NTSC compliant setups)
//
// However, this will only work, if the kernel can schedule the
// screensaver at the right time (a 2.6.x kernel should work fine,
// because of the high HZ value).
int candidateRate[3] = { 30, 25, 28 };
int bestRate = candidateRate[0];
int smallestError = 1000, i = 0;
do {
int r = candidateRate[i];
int error = TQMIN(screenRate % r, (screenRate + r) % r);
if (error < smallestError) {
smallestError = error;
bestRate = r;
}
} while (++i < 3);
//tqDebug("using %d Hz as framerate for effects", bestRate);
return bestRate;
}
bool ScreenProperties::enableVSync() {
// currently only supported on NVidia hardware using the
// proprietary driver
// For NVidia graphics cards: always use sync-to-vblank
// return (setenv("__GL_SYNC_TO_VBLANK", "1", 1) == 0);
return false;
}
} // NameSpace KIPISlideShowPlugin
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