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84 lines
2.5 KiB
84 lines
2.5 KiB
15 years ago
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/***************************************************************************
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pointerlatencyometer.h - measuring pointer latency
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-------------------
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begin : Wed Jun 30 12:04:44 CET 2002
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copyright : (C) 2002-2003 by Tim Jansen
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email : tim@tjansen.de
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include <qdatetime.h>
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#include <kdebug.h>
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struct PointerState {
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int x, y;
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QTime timestamp;
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};
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class PointerLatencyOMeter {
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private:
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enum { stateCapacity = 30, maximumLatency = 1000 };
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PointerState states[stateCapacity];
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int firstState, stateNum;
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float last3Latency, last20Latency;
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public:
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PointerLatencyOMeter() :
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firstState(0),
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stateNum(0),
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last3Latency(125),
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last20Latency(25) {
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}
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// registers a client pointer state
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void registerPointerState(int x, int y) {
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if (stateNum == stateCapacity)
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stateNum--;
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if (firstState == 0)
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firstState = stateCapacity-1;
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else
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firstState--;
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states[firstState].x = x;
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states[firstState].y = y;
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states[firstState].timestamp.start();
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stateNum++;
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}
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/* Returns true if pointer should be visible */
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bool registerLatency(int msecs) {
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last3Latency = ((last3Latency * 2.0) + msecs) / 3.0;
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last20Latency = ((last20Latency * 19.0) + msecs) / 20.0;
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if (msecs >= maximumLatency)
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return true;
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if (last3Latency > (1000/4))
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return true;
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return last20Latency > (1000/12);
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}
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// Called with server-side coordinates.
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// Returns true if pointer should be visible
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bool handlePointerEvent(int x, int y) {
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for (int i = stateNum-1; i >= 0; i--) {
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int idx = (i+firstState) % stateCapacity;
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if ((states[idx].x != x) ||
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(states[idx].y != y))
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continue;
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stateNum = i;
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int l = states[idx].timestamp.elapsed();
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return registerLatency((l > maximumLatency) ? maximumLatency : l);
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}
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return true;
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}
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};
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