142 lines
2.7 KiB
JavaScript
142 lines
2.7 KiB
JavaScript
goog.provide('ol.has');
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goog.require('goog.dom');
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goog.require('goog.dom.TagName');
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goog.require('ol');
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goog.require('ol.dom');
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goog.require('ol.webgl');
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/**
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* The ratio between physical pixels and device-independent pixels
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* (dips) on the device (`window.devicePixelRatio`).
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* @const
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* @type {number}
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* @api stable
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*/
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ol.has.DEVICE_PIXEL_RATIO = goog.global.devicePixelRatio || 1;
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/**
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* True if the browser supports ArrayBuffers.
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* @const
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* @type {boolean}
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*/
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ol.has.ARRAY_BUFFER = 'ArrayBuffer' in goog.global;
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/**
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* True if the browser's Canvas implementation implements {get,set}LineDash.
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* @type {boolean}
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*/
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ol.has.CANVAS_LINE_DASH = false;
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/**
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* True if browser supports Canvas.
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* @const
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* @type {boolean}
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* @api stable
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*/
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ol.has.CANVAS = ol.ENABLE_CANVAS && (
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/**
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* @return {boolean} Canvas supported.
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*/
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function() {
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if (!('HTMLCanvasElement' in goog.global)) {
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return false;
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}
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try {
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var context = ol.dom.createCanvasContext2D();
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if (goog.isNull(context)) {
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return false;
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} else {
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if (goog.isDef(context.setLineDash)) {
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ol.has.CANVAS_LINE_DASH = true;
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}
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return true;
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}
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} catch (e) {
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return false;
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}
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})();
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/**
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* Indicates if DeviceOrientation is supported in the user's browser.
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* @const
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* @type {boolean}
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* @api stable
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*/
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ol.has.DEVICE_ORIENTATION =
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'DeviceOrientationEvent' in goog.global;
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/**
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* True if browser supports DOM.
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* @const
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* @type {boolean}
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*/
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ol.has.DOM = ol.ENABLE_DOM;
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/**
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* Is HTML5 geolocation supported in the current browser?
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* @const
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* @type {boolean}
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* @api stable
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*/
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ol.has.GEOLOCATION = 'geolocation' in goog.global.navigator;
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/**
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* True if browser supports touch events.
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* @const
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* @type {boolean}
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* @api stable
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*/
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ol.has.TOUCH = ol.ASSUME_TOUCH || 'ontouchstart' in goog.global;
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/**
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* True if browser supports pointer events.
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* @const
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* @type {boolean}
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*/
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ol.has.POINTER = 'PointerEvent' in goog.global;
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/**
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* True if browser supports ms pointer events (IE 10).
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* @const
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* @type {boolean}
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*/
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ol.has.MSPOINTER =
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!!(goog.global.navigator.msPointerEnabled);
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/**
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* True if browser supports WebGL.
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* @const
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* @type {boolean}
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* @api stable
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*/
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ol.has.WEBGL = ol.ENABLE_WEBGL && (
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/**
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* @return {boolean} WebGL supported.
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*/
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function() {
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if (!('WebGLRenderingContext' in goog.global)) {
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return false;
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}
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try {
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var canvas = /** @type {HTMLCanvasElement} */
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(goog.dom.createElement(goog.dom.TagName.CANVAS));
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return !goog.isNull(ol.webgl.getContext(canvas, {
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failIfMajorPerformanceCaveat: true
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}));
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} catch (e) {
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return false;
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}
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})();
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