goog.provide('ol.has');
goog.require('goog.dom');
goog.require('goog.dom.TagName');
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 supports ArrayBuffers.
* @const
* @type {boolean}
*/
ol.has.ARRAY_BUFFER = 'ArrayBuffer' in goog.global;
/**
* True if the browser's Canvas implementation implements {get,set}LineDash.
* @type {boolean}
*/
ol.has.CANVAS_LINE_DASH = false;
/**
* True if browser supports Canvas.
* @const
* @type {boolean}
* @api stable
*/
ol.has.CANVAS = ol.ENABLE_CANVAS && (
/**
* @return {boolean} Canvas supported.
*/
function() {
if (!('HTMLCanvasElement' in goog.global)) {
return false;
}
try {
var context = ol.dom.createCanvasContext2D();
if (goog.isNull(context)) {
return false;
} else {
if (goog.isDef(context.setLineDash)) {
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 browser supports DOM.
* @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 browser supports WebGL.
* @const
* @type {boolean}
* @api stable
*/
ol.has.WEBGL;
(function() {
if (ol.ENABLE_WEBGL) {
var hasWebGL = false;
var textureSize;
var /** @type {Array.<string>} */ extensions = [];
if ('WebGLRenderingContext' in goog.global) {
try {
var canvas = /** @type {HTMLCanvasElement} */
(goog.dom.createElement(goog.dom.TagName.CANVAS));
var gl = ol.webgl.getContext(canvas, {
failIfMajorPerformanceCaveat: true
});
if (!goog.isNull(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;
}
})();