1 | (function (global, factory) {
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2 | typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
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3 | typeof define === 'function' && define.amd ? define(factory) :
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4 | (global.microFps = factory());
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5 | }(this, (function () { 'use strict';
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6 |
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7 | var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
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30 |
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31 | function microFps(callback) {
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32 | var refreshRate = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
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33 |
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34 | if (typeof callback !== 'function') throw new Error('Callback is not a function');
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35 | if (typeof refreshRate !== 'number' || isNaN(refreshRate) || refreshRate < 0 || refreshRate === Infinity) throw new Error('refreshRate should be a positive number! e.g. 2 (fps)');
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36 |
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37 |
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38 | var frames = -1;
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39 |
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40 | var trigger = 0;
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41 |
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42 |
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43 | var lastTimestamp = undefined;
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44 |
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45 |
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46 | var lastFps = 0;
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47 |
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48 | var jitter = 0;
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49 |
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50 |
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51 | var millis = (typeof performance === 'undefined' ? 'undefined' : _typeof(performance)) === 'object' && 'now' in performance ? performance.now.bind(performance) : Date.now.bind(Date);
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52 |
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53 | return function fpsMeterTick() {
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54 | if (frames >= trigger) {
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55 |
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56 | var now = millis();
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57 | if (lastTimestamp === undefined) lastTimestamp = now;
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58 | var elapsed = now - lastTimestamp;
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59 |
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60 | if (elapsed > 0) {
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61 |
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62 | var fps = frames > 0 ? 1000 / (elapsed / frames) : 0;
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63 |
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64 |
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65 | jitter = Math.abs(lastFps - fps);
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66 |
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67 | if (refreshRate > 0) {
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68 |
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69 | trigger = trigger * 0.5 + fps / refreshRate * 0.5;
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70 | if (trigger < 0) trigger = 0;
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71 | } else {
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72 | trigger = 0;
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73 | }
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74 |
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75 | var info = {
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76 | fps: fps,
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77 | jitter: jitter,
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78 | elapsed: elapsed,
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79 | frames: frames,
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80 | trigger: trigger
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81 | };
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82 |
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83 |
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84 | lastTimestamp = now;
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85 | lastFps = fps;
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86 | frames = 0;
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87 |
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88 | callback(info);
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89 | } else {
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90 |
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91 | trigger *= 2;
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92 | }
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93 | }
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94 | frames++;
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95 | };
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96 | }
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97 |
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98 | return microFps;
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99 |
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100 | })));
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