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/* --- name: "Frame" description: "Provides cross-browser interface for requestAnimationFrame" license: - "[GNU Lesser General Public License](http://opensource.org/licenses/lgpl-license.php)" - "[MIT License](http://opensource.org/licenses/mit-license.php)" requires: - Core provides: frame ... */ (function () { var previous, started = false, callbacks = [], remove = [], frameTime = 16, // 62 fps // we'll switch to real `requestAnimationFrame` here // when all browsers will be ready requestAnimationFrame = function (callback) { window.setTimeout(callback, frameTime); }; function startAnimation () { if (!started) { previous = Date.now(); requestAnimationFrame(frame); started = true; } } function invokeFrame () { var fn, i, l, now = Date.now(), // 1 sec is max time for frame to avoid some bugs with too large time delta = Math.min(now - previous, 1000); for (i = 0, l = remove.length; i < l; i++) { coreEraseOne(callbacks, remove[i]); } remove.length = 0; for (i = 0, l = callbacks.length; i < l; i++) { fn = callbacks[i]; // one of previous calls can remove our fn if (remove.indexOf(fn) == -1) { fn.call(null, delta); } } previous = now; } function frame() { requestAnimationFrame(frame); if (callbacks.length == 0) { remove.length = 0; previous = Date.now(); } else invokeFrame(); } atom.frame = { add: function (fn) { startAnimation(); includeUnique(callbacks, fn); }, // we dont want to fragmentate callbacks, so remove only before frame started remove: function (fn) { if (started) includeUnique(remove, fn); } }; }());
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