Your IP : 216.73.216.43
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
define([], function () {
'use strict';
var processMap = new WeakMap(),
origRaf,
raf;
origRaf = window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.onRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function (callback) {
if (typeof callback != 'function') {
throw new Error('raf argument "callback" must be of type function');
}
window.setTimeout(callback, 1000 / 60);
};
/**
* Creates new process object or extracts the
* the existing one.
*
* @param {*} id - Process identifier.
* @param {Number} fps - Required FPS count.
* @returns {Object}
*/
function getProcess(id, fps) {
var process = processMap.get(id);
if (!process) {
process = {};
processMap.set(id, process);
}
if (process.fps !== fps) {
process.fps = fps;
process.interval = 1000 / fps;
process.update = Date.now();
}
return process;
}
/**
* Proxy method which delegates call to the 'requestAnimationFrame'
* function and optionally can keep track of the FPS with which
* provided function is called.
*
* @param {Function} callback - Callback function to be passed to 'requestAnimationFrame'.
* @param {Number} [fps] - If specified, will update FPS counter for the provided function.
* @returns {Number|Boolean} ID of request or a flag which indicates
* whether callback fits specified FPS.
*/
raf = function (callback, fps) {
var rafId = origRaf(callback);
return fps ? raf.tick(callback, fps) : rafId;
};
/**
* Updates FPS counter for the specified process
* and returns a flag which indicates whether
* counter value is equal or greater than the required FPS.
*
* @param {*} id - Process identifier.
* @param {Number} fps - Required FPS count.
* @returns {Boolean}
*/
raf.tick = function (id, fps) {
var process = getProcess(id, fps),
now = Date.now(),
delta = now - process.update,
interval = process.interval;
if (fps >= 60 || delta >= interval) {
process.update = now - delta % interval;
return true;
}
return false;
};
return raf;
});