# all files / ol/ has.js

93.02% Statements 40/43
66.67% Branches 16/24
100% Functions 2/2
93.02% Lines 40/43

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     goog.provide('ol.has');

    goog.require('ol');
    goog.require('ol.webgl');

    var ua = typeof navigator !== 'undefined' ?
      navigator.userAgent.toLowerCase() : '';

    /**
     * User agent string says we are dealing with Firefox as browser.
     * @type {boolean}
     */
    ol.has.FIREFOX = ua.indexOf('firefox') !== -1;

    /**
     * User agent string says we are dealing with Safari as browser.
     * @type {boolean}
     */
    ol.has.SAFARI = ua.indexOf('safari') !== -1 && ua.indexOf('chrom') == -1;

    /**
     * User agent string says we are dealing with a WebKit engine.
     * @type {boolean}
     */
    ol.has.WEBKIT = ua.indexOf('webkit') !== -1 && ua.indexOf('edge') == -1;

    /**
     * User agent string says we are dealing with a Mac as platform.
     * @type {boolean}
     */
    ol.has.MAC = ua.indexOf('macintosh') !== -1;

    /**
     * The ratio between physical pixels and device-independent pixels
     * (dips) on the device (`window.devicePixelRatio`).
     * @const
     * @type {number}
     * @api
     */
    ol.has.DEVICE_PIXEL_RATIO = window.devicePixelRatio || 1;

    /**
     * True if the browser's Canvas implementation implements {get,set}LineDash.
     * @type {boolean}
     */
    ol.has.CANVAS_LINE_DASH = false;

    /**
     * True if both the library and browser support Canvas.  Always `false`
     * if `ol.ENABLE_CANVAS` is set to `false` at compile time.
     * @const
     * @type {boolean}
     * @api
     */
    ol.has.CANVAS = ol.ENABLE_CANVAS && (
      /**
       * @return {boolean} Canvas supported.
       */
      function() {
        Iif (!('HTMLCanvasElement' in window)) {
          return false;
        }
        try {
          var context = document.createElement('CANVAS').getContext('2d');
          Iif (!context) {
            return false;
          } else {
            Eif (context.setLineDash !== undefined) {
              ol.has.CANVAS_LINE_DASH = true;
            }
            return true;
          }
        } catch (e) {
          return false;
        }
      })();

    /**
     * Indicates if DeviceOrientation is supported in the user's browser.
     * @const
     * @type {boolean}
     * @api
     */
    ol.has.DEVICE_ORIENTATION = 'DeviceOrientationEvent' in window;

    /**
     * Is HTML5 geolocation supported in the current browser?
     * @const
     * @type {boolean}
     * @api
     */
    ol.has.GEOLOCATION = 'geolocation' in navigator;

    /**
     * True if browser supports touch events.
     * @const
     * @type {boolean}
     * @api
     */
    ol.has.TOUCH = ol.ASSUME_TOUCH || 'ontouchstart' in window;

    /**
     * True if browser supports pointer events.
     * @const
     * @type {boolean}
     */
    ol.has.POINTER = 'PointerEvent' in window;

    /**
     * True if browser supports ms pointer events (IE 10).
     * @const
     * @type {boolean}
     */
    ol.has.MSPOINTER = !!(navigator.msPointerEnabled);

    /**
     * True if both OpenLayers and browser support WebGL.  Always `false`
     * if `ol.ENABLE_WEBGL` is set to `false` at compile time.
     * @const
     * @type {boolean}
     * @api
     */
    ol.has.WEBGL;

    (function() {
      Eif (ol.ENABLE_WEBGL) {
        var hasWebGL = false;
        var textureSize;
        var /** @type {Array.<string>} */ extensions = [];

        Eif ('WebGLRenderingContext' in window) {
          try {
            var canvas = /** @type {HTMLCanvasElement} */
                (document.createElement('CANVAS'));
            var gl = ol.webgl.getContext(canvas, {
              failIfMajorPerformanceCaveat: true
            });
            Eif (gl) {
              hasWebGL = true;
              textureSize = /** @type {number} */
                (gl.getParameter(gl.MAX_TEXTURE_SIZE));
              extensions = gl.getSupportedExtensions();
            }
          } catch (e) {
            // pass
          }
        }
        ol.has.WEBGL = hasWebGL;
        ol.WEBGL_EXTENSIONS = extensions;
        ol.WEBGL_MAX_TEXTURE_SIZE = textureSize;
      }
    })();