610 lines
23 KiB
JavaScript
610 lines
23 KiB
JavaScript
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define([
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'../Core/Credit',
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'../Core/decodeGoogleEarthEnterpriseData',
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'../Core/defaultValue',
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'../Core/defined',
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'../Core/defineProperties',
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'../Core/DeveloperError',
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'../Core/Event',
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'../Core/GeographicTilingScheme',
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'../Core/GoogleEarthEnterpriseMetadata',
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'../Core/loadImageFromTypedArray',
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'../Core/Math',
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'../Core/Rectangle',
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'../Core/Request',
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'../Core/Resource',
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'../Core/RuntimeError',
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'../Core/TileProviderError',
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'../ThirdParty/protobuf-minimal',
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'../ThirdParty/when'
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], function(
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Credit,
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decodeGoogleEarthEnterpriseData,
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defaultValue,
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defined,
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defineProperties,
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DeveloperError,
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Event,
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GeographicTilingScheme,
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GoogleEarthEnterpriseMetadata,
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loadImageFromTypedArray,
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CesiumMath,
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Rectangle,
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Request,
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Resource,
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RuntimeError,
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TileProviderError,
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protobuf,
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when) {
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'use strict';
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function GoogleEarthEnterpriseDiscardPolicy() {
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this._image = new Image();
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}
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/**
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* Determines if the discard policy is ready to process images.
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* @returns {Boolean} True if the discard policy is ready to process images; otherwise, false.
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*/
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GoogleEarthEnterpriseDiscardPolicy.prototype.isReady = function() {
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return true;
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};
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/**
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* Given a tile image, decide whether to discard that image.
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*
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* @param {Image} image An image to test.
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* @returns {Boolean} True if the image should be discarded; otherwise, false.
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*/
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GoogleEarthEnterpriseDiscardPolicy.prototype.shouldDiscardImage = function(image) {
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return (image === this._image);
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};
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/**
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* Provides tiled imagery using the Google Earth Enterprise REST API.
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*
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* Notes: This provider is for use with the 3D Earth API of Google Earth Enterprise,
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* {@link GoogleEarthEnterpriseMapsProvider} should be used with 2D Maps API.
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*
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* @alias GoogleEarthEnterpriseImageryProvider
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* @constructor
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*
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* @param {Object} options Object with the following properties:
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* @param {Resource|String} options.url The url of the Google Earth Enterprise server hosting the imagery.
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* @param {GoogleEarthEnterpriseMetadata} options.metadata A metadata object that can be used to share metadata requests with a GoogleEarthEnterpriseTerrainProvider.
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* @param {Ellipsoid} [options.ellipsoid] The ellipsoid. If not specified, the WGS84 ellipsoid is used.
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* @param {TileDiscardPolicy} [options.tileDiscardPolicy] The policy that determines if a tile
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* is invalid and should be discarded. If this value is not specified, a default
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* is to discard tiles that fail to download.
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* @param {Credit|String} [options.credit] A credit for the data source, which is displayed on the canvas.
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*
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* @see GoogleEarthEnterpriseTerrainProvider
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* @see ArcGisMapServerImageryProvider
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* @see GoogleEarthEnterpriseMapsProvider
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* @see createOpenStreetMapImageryProvider
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* @see SingleTileImageryProvider
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* @see createTileMapServiceImageryProvider
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* @see WebMapServiceImageryProvider
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* @see WebMapTileServiceImageryProvider
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* @see UrlTemplateImageryProvider
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*
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*
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* @example
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* var geeMetadata = new GoogleEarthEnterpriseMetadata('http://www.earthenterprise.org/3d');
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* var gee = new Cesium.GoogleEarthEnterpriseImageryProvider({
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* metadata : geeMetadata
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* });
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*
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* @see {@link http://www.w3.org/TR/cors/|Cross-Origin Resource Sharing}
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*/
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function GoogleEarthEnterpriseImageryProvider(options) {
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options = defaultValue(options, defaultValue.EMPTY_OBJECT);
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//>>includeStart('debug', pragmas.debug);
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if (!(defined(options.url) || defined(options.metadata))) {
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throw new DeveloperError('options.url or options.metadata is required.');
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}
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//>>includeEnd('debug');
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var metadata;
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if (defined(options.metadata)) {
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metadata = options.metadata;
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} else {
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var resource = Resource.createIfNeeded(options.url);
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metadata = new GoogleEarthEnterpriseMetadata(resource);
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}
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this._metadata = metadata;
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this._tileDiscardPolicy = options.tileDiscardPolicy;
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this._tilingScheme = new GeographicTilingScheme({
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numberOfLevelZeroTilesX : 2,
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numberOfLevelZeroTilesY : 2,
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rectangle : new Rectangle(-CesiumMath.PI, -CesiumMath.PI, CesiumMath.PI, CesiumMath.PI),
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ellipsoid : options.ellipsoid
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});
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var credit = options.credit;
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if (typeof credit === 'string') {
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credit = new Credit(credit);
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}
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this._credit = credit;
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this._tileWidth = 256;
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this._tileHeight = 256;
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this._maximumLevel = 23;
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// Install the default tile discard policy if none has been supplied.
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if (!defined(this._tileDiscardPolicy)) {
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this._tileDiscardPolicy = new GoogleEarthEnterpriseDiscardPolicy();
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}
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this._errorEvent = new Event();
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this._ready = false;
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var that = this;
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var metadataError;
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this._readyPromise = metadata.readyPromise
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.then(function(result) {
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if (!metadata.imageryPresent) {
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var e = new RuntimeError('The server ' + metadata.url + ' doesn\'t have imagery');
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metadataError = TileProviderError.handleError(metadataError, that, that._errorEvent, e.message, undefined, undefined, undefined, e);
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return when.reject(e);
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}
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TileProviderError.handleSuccess(metadataError);
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that._ready = result;
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return result;
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})
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.otherwise(function(e) {
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metadataError = TileProviderError.handleError(metadataError, that, that._errorEvent, e.message, undefined, undefined, undefined, e);
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return when.reject(e);
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});
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}
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defineProperties(GoogleEarthEnterpriseImageryProvider.prototype, {
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/**
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* Gets the name of the Google Earth Enterprise server url hosting the imagery.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {String}
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* @readonly
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*/
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url : {
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get : function() {
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return this._metadata.url;
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}
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},
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/**
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* Gets the proxy used by this provider.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Proxy}
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* @readonly
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*/
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proxy : {
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get : function() {
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return this._metadata.proxy;
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}
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},
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/**
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* Gets the width of each tile, in pixels. This function should
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* not be called before {@link GoogleEarthEnterpriseImageryProvider#ready} returns true.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Number}
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* @readonly
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*/
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tileWidth : {
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get : function() {
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//>>includeStart('debug', pragmas.debug);
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if (!this._ready) {
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throw new DeveloperError('tileWidth must not be called before the imagery provider is ready.');
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}
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//>>includeEnd('debug');
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return this._tileWidth;
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}
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},
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/**
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* Gets the height of each tile, in pixels. This function should
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* not be called before {@link GoogleEarthEnterpriseImageryProvider#ready} returns true.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Number}
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* @readonly
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*/
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tileHeight : {
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get : function() {
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//>>includeStart('debug', pragmas.debug);
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if (!this._ready) {
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throw new DeveloperError('tileHeight must not be called before the imagery provider is ready.');
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}
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//>>includeEnd('debug');
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return this._tileHeight;
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}
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},
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/**
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* Gets the maximum level-of-detail that can be requested. This function should
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* not be called before {@link GoogleEarthEnterpriseImageryProvider#ready} returns true.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Number}
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* @readonly
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*/
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maximumLevel : {
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get : function() {
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//>>includeStart('debug', pragmas.debug);
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if (!this._ready) {
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throw new DeveloperError('maximumLevel must not be called before the imagery provider is ready.');
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}
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//>>includeEnd('debug');
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return this._maximumLevel;
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}
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},
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/**
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* Gets the minimum level-of-detail that can be requested. This function should
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* not be called before {@link GoogleEarthEnterpriseImageryProvider#ready} returns true.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Number}
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* @readonly
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*/
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minimumLevel : {
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get : function() {
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//>>includeStart('debug', pragmas.debug);
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if (!this._ready) {
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throw new DeveloperError('minimumLevel must not be called before the imagery provider is ready.');
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}
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//>>includeEnd('debug');
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return 0;
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}
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},
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/**
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* Gets the tiling scheme used by this provider. This function should
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* not be called before {@link GoogleEarthEnterpriseImageryProvider#ready} returns true.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {TilingScheme}
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* @readonly
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*/
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tilingScheme : {
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get : function() {
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//>>includeStart('debug', pragmas.debug);
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if (!this._ready) {
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throw new DeveloperError('tilingScheme must not be called before the imagery provider is ready.');
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}
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//>>includeEnd('debug');
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return this._tilingScheme;
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}
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},
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/**
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* Gets the rectangle, in radians, of the imagery provided by this instance. This function should
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* not be called before {@link GoogleEarthEnterpriseImageryProvider#ready} returns true.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Rectangle}
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* @readonly
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*/
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rectangle : {
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get : function() {
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//>>includeStart('debug', pragmas.debug);
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if (!this._ready) {
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throw new DeveloperError('rectangle must not be called before the imagery provider is ready.');
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}
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//>>includeEnd('debug');
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return this._tilingScheme.rectangle;
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}
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},
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/**
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* Gets the tile discard policy. If not undefined, the discard policy is responsible
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* for filtering out "missing" tiles via its shouldDiscardImage function. If this function
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* returns undefined, no tiles are filtered. This function should
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* not be called before {@link GoogleEarthEnterpriseImageryProvider#ready} returns true.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {TileDiscardPolicy}
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* @readonly
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*/
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tileDiscardPolicy : {
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get : function() {
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//>>includeStart('debug', pragmas.debug);
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if (!this._ready) {
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throw new DeveloperError('tileDiscardPolicy must not be called before the imagery provider is ready.');
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}
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//>>includeEnd('debug');
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return this._tileDiscardPolicy;
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}
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},
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/**
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* Gets an event that is raised when the imagery provider encounters an asynchronous error. By subscribing
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* to the event, you will be notified of the error and can potentially recover from it. Event listeners
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* are passed an instance of {@link TileProviderError}.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Event}
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* @readonly
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*/
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errorEvent : {
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get : function() {
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return this._errorEvent;
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}
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},
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/**
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* Gets a value indicating whether or not the provider is ready for use.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Boolean}
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* @readonly
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*/
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ready : {
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get : function() {
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return this._ready;
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}
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},
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/**
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* Gets a promise that resolves to true when the provider is ready for use.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Promise.<Boolean>}
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* @readonly
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*/
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readyPromise : {
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get : function() {
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return this._readyPromise;
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}
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},
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/**
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* Gets the credit to display when this imagery provider is active. Typically this is used to credit
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* the source of the imagery. This function should not be called before {@link GoogleEarthEnterpriseImageryProvider#ready} returns true.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Credit}
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* @readonly
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*/
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credit : {
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get : function() {
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return this._credit;
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}
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},
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/**
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* Gets a value indicating whether or not the images provided by this imagery provider
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* include an alpha channel. If this property is false, an alpha channel, if present, will
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* be ignored. If this property is true, any images without an alpha channel will be treated
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* as if their alpha is 1.0 everywhere. Setting this property to false reduces memory usage
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* and texture upload time.
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* @memberof GoogleEarthEnterpriseImageryProvider.prototype
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* @type {Boolean}
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* @readonly
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*/
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hasAlphaChannel : {
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get : function() {
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return false;
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}
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}
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});
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|
|
|
||
|
|
/**
|
||
|
|
* Gets the credits to be displayed when a given tile is displayed.
|
||
|
|
*
|
||
|
|
* @param {Number} x The tile X coordinate.
|
||
|
|
* @param {Number} y The tile Y coordinate.
|
||
|
|
* @param {Number} level The tile level;
|
||
|
|
* @returns {Credit[]} The credits to be displayed when the tile is displayed.
|
||
|
|
*
|
||
|
|
* @exception {DeveloperError} <code>getTileCredits</code> must not be called before the imagery provider is ready.
|
||
|
|
*/
|
||
|
|
GoogleEarthEnterpriseImageryProvider.prototype.getTileCredits = function(x, y, level) {
|
||
|
|
//>>includeStart('debug', pragmas.debug);
|
||
|
|
if (!this._ready) {
|
||
|
|
throw new DeveloperError('getTileCredits must not be called before the imagery provider is ready.');
|
||
|
|
}
|
||
|
|
//>>includeEnd('debug');
|
||
|
|
|
||
|
|
var metadata = this._metadata;
|
||
|
|
var info = metadata.getTileInformation(x, y, level);
|
||
|
|
if (defined(info)) {
|
||
|
|
var credit = metadata.providers[info.imageryProvider];
|
||
|
|
if (defined(credit)) {
|
||
|
|
return [credit];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return undefined;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Requests the image for a given tile. This function should
|
||
|
|
* not be called before {@link GoogleEarthEnterpriseImageryProvider#ready} returns true.
|
||
|
|
*
|
||
|
|
* @param {Number} x The tile X coordinate.
|
||
|
|
* @param {Number} y The tile Y coordinate.
|
||
|
|
* @param {Number} level The tile level.
|
||
|
|
* @param {Request} [request] The request object. Intended for internal use only.
|
||
|
|
* @returns {Promise.<Image|Canvas>|undefined} A promise for the image that will resolve when the image is available, or
|
||
|
|
* undefined if there are too many active requests to the server, and the request
|
||
|
|
* should be retried later. The resolved image may be either an
|
||
|
|
* Image or a Canvas DOM object.
|
||
|
|
*
|
||
|
|
* @exception {DeveloperError} <code>requestImage</code> must not be called before the imagery provider is ready.
|
||
|
|
*/
|
||
|
|
GoogleEarthEnterpriseImageryProvider.prototype.requestImage = function(x, y, level, request) {
|
||
|
|
//>>includeStart('debug', pragmas.debug);
|
||
|
|
if (!this._ready) {
|
||
|
|
throw new DeveloperError('requestImage must not be called before the imagery provider is ready.');
|
||
|
|
}
|
||
|
|
//>>includeEnd('debug');
|
||
|
|
|
||
|
|
var invalidImage = this._tileDiscardPolicy._image; // Empty image or undefined depending on discard policy
|
||
|
|
var metadata = this._metadata;
|
||
|
|
var quadKey = GoogleEarthEnterpriseMetadata.tileXYToQuadKey(x, y, level);
|
||
|
|
var info = metadata.getTileInformation(x, y, level);
|
||
|
|
if (!defined(info)) {
|
||
|
|
if (metadata.isValid(quadKey)) {
|
||
|
|
var metadataRequest = new Request({
|
||
|
|
throttle : request.throttle,
|
||
|
|
throttleByServer : request.throttleByServer,
|
||
|
|
type : request.type,
|
||
|
|
priorityFunction : request.priorityFunction
|
||
|
|
});
|
||
|
|
metadata.populateSubtree(x, y, level, metadataRequest);
|
||
|
|
return undefined; // No metadata so return undefined so we can be loaded later
|
||
|
|
}
|
||
|
|
return invalidImage; // Image doesn't exist
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!info.hasImagery()) {
|
||
|
|
// Already have info and there isn't any imagery here
|
||
|
|
return invalidImage;
|
||
|
|
}
|
||
|
|
var promise = buildImageResource(this, info, x, y, level, request).fetchArrayBuffer();
|
||
|
|
if (!defined(promise)) {
|
||
|
|
return undefined; // Throttled
|
||
|
|
}
|
||
|
|
|
||
|
|
return promise
|
||
|
|
.then(function(image) {
|
||
|
|
decodeGoogleEarthEnterpriseData(metadata.key, image);
|
||
|
|
var a = new Uint8Array(image);
|
||
|
|
var type;
|
||
|
|
|
||
|
|
var protoImagery = metadata.protoImagery;
|
||
|
|
if (!defined(protoImagery) || !protoImagery) {
|
||
|
|
type = getImageType(a);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!defined(type) && (!defined(protoImagery) || protoImagery)) {
|
||
|
|
var message = decodeEarthImageryPacket(a);
|
||
|
|
type = message.imageType;
|
||
|
|
a = message.imageData;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!defined(type) || !defined(a)) {
|
||
|
|
return invalidImage;
|
||
|
|
}
|
||
|
|
|
||
|
|
return loadImageFromTypedArray(a, type);
|
||
|
|
});
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Picking features is not currently supported by this imagery provider, so this function simply returns
|
||
|
|
* undefined.
|
||
|
|
*
|
||
|
|
* @param {Number} x The tile X coordinate.
|
||
|
|
* @param {Number} y The tile Y coordinate.
|
||
|
|
* @param {Number} level The tile level.
|
||
|
|
* @param {Number} longitude The longitude at which to pick features.
|
||
|
|
* @param {Number} latitude The latitude at which to pick features.
|
||
|
|
* @return {Promise.<ImageryLayerFeatureInfo[]>|undefined} A promise for the picked features that will resolve when the asynchronous
|
||
|
|
* picking completes. The resolved value is an array of {@link ImageryLayerFeatureInfo}
|
||
|
|
* instances. The array may be empty if no features are found at the given location.
|
||
|
|
* It may also be undefined if picking is not supported.
|
||
|
|
*/
|
||
|
|
GoogleEarthEnterpriseImageryProvider.prototype.pickFeatures = function(x, y, level, longitude, latitude) {
|
||
|
|
return undefined;
|
||
|
|
};
|
||
|
|
|
||
|
|
//
|
||
|
|
// Functions to handle imagery packets
|
||
|
|
//
|
||
|
|
function buildImageResource(imageryProvider, info, x, y, level, request) {
|
||
|
|
var quadKey = GoogleEarthEnterpriseMetadata.tileXYToQuadKey(x, y, level);
|
||
|
|
var version = info.imageryVersion;
|
||
|
|
version = (defined(version) && version > 0) ? version : 1;
|
||
|
|
|
||
|
|
return imageryProvider._metadata.resource.getDerivedResource({
|
||
|
|
url: 'flatfile?f1-0' + quadKey + '-i.' + version.toString(),
|
||
|
|
request: request
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
// Detects if a Uint8Array is a JPEG or PNG
|
||
|
|
function getImageType(image) {
|
||
|
|
var jpeg = 'JFIF';
|
||
|
|
if (image[6] === jpeg.charCodeAt(0) && image[7] === jpeg.charCodeAt(1) &&
|
||
|
|
image[8] === jpeg.charCodeAt(2) && image[9] === jpeg.charCodeAt(3)) {
|
||
|
|
return 'image/jpeg';
|
||
|
|
}
|
||
|
|
|
||
|
|
var png = 'PNG';
|
||
|
|
if (image[1] === png.charCodeAt(0) && image[2] === png.charCodeAt(1) && image[3] === png.charCodeAt(2)) {
|
||
|
|
return 'image/png';
|
||
|
|
}
|
||
|
|
|
||
|
|
return undefined;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Decodes an Imagery protobuf into the message
|
||
|
|
// Partially generated with the help of protobuf.js static generator
|
||
|
|
function decodeEarthImageryPacket(data) {
|
||
|
|
var reader = protobuf.Reader.create(data);
|
||
|
|
var end = reader.len;
|
||
|
|
var message = {};
|
||
|
|
while (reader.pos < end) {
|
||
|
|
var tag = reader.uint32();
|
||
|
|
switch (tag >>> 3) {
|
||
|
|
case 1:
|
||
|
|
message.imageType = reader.uint32();
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
message.imageData = reader.bytes();
|
||
|
|
break;
|
||
|
|
case 3:
|
||
|
|
message.alphaType = reader.uint32();
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
message.imageAlpha = reader.bytes();
|
||
|
|
break;
|
||
|
|
case 5:
|
||
|
|
var copyrightIds = message.copyrightIds;
|
||
|
|
if (!defined(copyrightIds)) {
|
||
|
|
copyrightIds = message.copyrightIds = [];
|
||
|
|
}
|
||
|
|
if ((tag & 7) === 2) {
|
||
|
|
var end2 = reader.uint32() + reader.pos;
|
||
|
|
while (reader.pos < end2) {
|
||
|
|
copyrightIds.push(reader.uint32());
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
copyrightIds.push(reader.uint32());
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
reader.skipType(tag & 7);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
var imageType = message.imageType;
|
||
|
|
if (defined(imageType)) {
|
||
|
|
switch (imageType) {
|
||
|
|
case 0:
|
||
|
|
message.imageType = 'image/jpeg';
|
||
|
|
break;
|
||
|
|
case 4:
|
||
|
|
message.imageType = 'image/png';
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
throw new RuntimeError('GoogleEarthEnterpriseImageryProvider: Unsupported image type.');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
var alphaType = message.alphaType;
|
||
|
|
if (defined(alphaType) && alphaType !== 0) {
|
||
|
|
console.log('GoogleEarthEnterpriseImageryProvider: External alpha not supported.');
|
||
|
|
delete message.alphaType;
|
||
|
|
delete message.imageAlpha;
|
||
|
|
}
|
||
|
|
|
||
|
|
return message;
|
||
|
|
}
|
||
|
|
|
||
|
|
return GoogleEarthEnterpriseImageryProvider;
|
||
|
|
});
|