UNPKG

openlayers

Version:

Build tools and sources for developing OpenLayers based mapping applications

163 lines (135 loc) 3.63 kB
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 stable */ 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 stable */ ol.has.CANVAS = ol.ENABLE_CANVAS && ( /** * @return {boolean} Canvas supported. */ function() { if (!('HTMLCanvasElement' in window)) { return false; } try { var context = document.createElement('CANVAS').getContext('2d'); if (!context) { return false; } else { if (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 window; /** * Is HTML5 geolocation supported in the current browser? * @const * @type {boolean} * @api stable */ ol.has.GEOLOCATION = 'geolocation' in navigator; /** * True if browser supports touch events. * @const * @type {boolean} * @api stable */ 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 stable */ ol.has.WEBGL; (function() { if (ol.ENABLE_WEBGL) { var hasWebGL = false; var textureSize; var /** @type {Array.<string>} */ extensions = []; if ('WebGLRenderingContext' in window) { 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) { // pass } } ol.has.WEBGL = hasWebGL; ol.WEBGL_EXTENSIONS = extensions; ol.WEBGL_MAX_TEXTURE_SIZE = textureSize; } })();