openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
163 lines (135 loc) • 3.63 kB
JavaScript
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;
}
})();