# all files / ol/ has.js

72.5% Statements 29/40
55.56% Branches 10/18
100% Functions 2/2
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     goog.provide('ol.has');

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

    /**
     * The ratio between physical pixels and device-independent pixels
     * (dips) on the device (`window.devicePixelRatio`).
     * @const
     * @type {number}
     * @api stable
     */
    ol.has.DEVICE_PIXEL_RATIO = goog.global.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 stable
     */
    ol.has.CANVAS = ol.ENABLE_CANVAS && (
        /**
         * @return {boolean} Canvas supported.
         */
        function() {
          Iif (!('HTMLCanvasElement' in goog.global)) {
            return false;
          }
          try {
            var context = ol.dom.createCanvasContext2D();
            Iif (!context) {
              return false;
            } else {
              Iif (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 stable
     */
    ol.has.DEVICE_ORIENTATION = 'DeviceOrientationEvent' in goog.global;

    /**
     * True if `ol.ENABLE_DOM` is set to `true` at compile time.
     * @const
     * @type {boolean}
     */
    ol.has.DOM = ol.ENABLE_DOM;

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

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

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

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

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

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