three.js/manual/examples/resources/threejs-utils.js

/*
 * Copyright 2012, Gregg Tavares.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Gregg Tavares. nor the names of his
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* global define */

(function(root, factory) {  // eslint-disable-line
	if ( typeof define === 'function' && define.amd ) {

		// AMD. Register as an anonymous module.
		define( [], function () {

			return factory.call( root );

		} );

	} else {

		// Browser globals
		root.threejsUtils = factory.call( root );

	}

}( this, function () {

  'use strict';  // eslint-disable-line

	/** @module threejs-utils */

	/**
   * Resize a canvas to match the size its displayed.
   * @param {HTMLCanvasElement} canvas The canvas to resize.
   * @param {number} [multiplier] amount to multiply by.
   *    Pass in window.devicePixelRatio for native pixels.
   * @return {boolean} true if the canvas was resized.
   * @memberOf module:webgl-utils
   */
	function resizeCanvasToDisplaySize( canvas, multiplier ) {

		multiplier = multiplier || 1;
		const width = canvas.clientWidth * multiplier | 0;
		const height = canvas.clientHeight * multiplier | 0;
		if ( canvas.width !== width || canvas.height !== height ) {

			canvas.width = width;
			canvas.height = height;
			return true;

		}

		return false;

	}

	return {
		resizeCanvasToDisplaySize: resizeCanvasToDisplaySize,
	};

} ) );