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import Credit from "../Core/Credit.js";
import decodeGoogleEarthEnterpriseData from "../Core/decodeGoogleEarthEnterpriseData.js";
import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import Event from "../Core/Event.js";
import GeographicTilingScheme from "../Core/GeographicTilingScheme.js";
import GoogleEarthEnterpriseMetadata from "../Core/GoogleEarthEnterpriseMetadata.js";
import loadImageFromTypedArray from "../Core/loadImageFromTypedArray.js";
import CesiumMath from "../Core/Math.js";
import Rectangle from "../Core/Rectangle.js";
import Request from "../Core/Request.js";
import RuntimeError from "../Core/RuntimeError.js";
import * as protobuf from "protobufjs/dist/minimal/protobuf.js";
/**
* @private
*/
function GoogleEarthEnterpriseDiscardPolicy() {
this._image = new Image();
}
/**
* Determines if the discard policy is ready to process images.
* @returns {boolean} True if the discard policy is ready to process images; otherwise, false.
*/
GoogleEarthEnterpriseDiscardPolicy.prototype.isReady = function () {
return true;
};
/**
* Given a tile image, decide whether to discard that image.
*
* @param {HTMLImageElement} image An image to test.
* @returns {boolean} True if the image should be discarded; otherwise, false.
*/
GoogleEarthEnterpriseDiscardPolicy.prototype.shouldDiscardImage = function (
image,
) {
return image === this._image;
};
/**
* @typedef {object} GoogleEarthEnterpriseImageryProvider.ConstructorOptions
*
* Initialization options for the GoogleEarthEnterpriseImageryProvider constructor
*
* @property {Ellipsoid} [ellipsoid=Ellipsoid.default] The ellipsoid. If not specified, the default ellipsoid is used.
* @property {TileDiscardPolicy} [tileDiscardPolicy] The policy that determines if a tile
* is invalid and should be discarded. If this value is not specified, a default
* is to discard tiles that fail to download.
* @property {Credit|string} [credit] A credit for the data source, which is displayed on the canvas.
*/
/**
* <div class="notice">
* To construct a GoogleEarthEnterpriseImageryProvider, call {@link GoogleEarthEnterpriseImageryProvider.fromMetadata}. Do not call the constructor directly.
* </div>
*
* Provides tiled imagery using the Google Earth Enterprise REST API.
*
* Notes: This provider is for use with the 3D Earth API of Google Earth Enterprise,
* {@link GoogleEarthEnterpriseMapsProvider} should be used with 2D Maps API.
*
* @alias GoogleEarthEnterpriseImageryProvider
* @constructor
*
* @param {GoogleEarthEnterpriseImageryProvider.ConstructorOptions} [options] Object describing initialization options
*
* @see GoogleEarthEnterpriseImageryProvider.fromMetadata
* @see GoogleEarthEnterpriseTerrainProvider
* @see ArcGisMapServerImageryProvider
* @see GoogleEarthEnterpriseMapsProvider
* @see OpenStreetMapImageryProvider
* @see SingleTileImageryProvider
* @see TileMapServiceImageryProvider
* @see WebMapServiceImageryProvider
* @see WebMapTileServiceImageryProvider
* @see UrlTemplateImageryProvider
*
*
* @example
* const geeMetadata = await GoogleEarthEnterpriseMetadata.fromUrl("http://www.example.com");
* const gee = Cesium.GoogleEarthEnterpriseImageryProvider.fromMetadata(geeMetadata);
*
* @see {@link http://www.w3.org/TR/cors/|Cross-Origin Resource Sharing}
*/
function GoogleEarthEnterpriseImageryProvider(options) {
options = options ?? Frozen.EMPTY_OBJECT;
this._defaultAlpha = undefined;
this._defaultNightAlpha = undefined;
this._defaultDayAlpha = undefined;
this._defaultBrightness = undefined;
this._defaultContrast = undefined;
this._defaultHue = undefined;
this._defaultSaturation = undefined;
this._defaultGamma = undefined;
this._defaultMinificationFilter = undefined;
this._defaultMagnificationFilter = undefined;
this._tileDiscardPolicy = options.tileDiscardPolicy;
this._tilingScheme = new GeographicTilingScheme({
numberOfLevelZeroTilesX: 2,
numberOfLevelZeroTilesY: 2,
rectangle: new Rectangle(
-CesiumMath.PI,
-CesiumMath.PI,
CesiumMath.PI,
CesiumMath.PI,
),
ellipsoid: options.ellipsoid,
});
let credit = options.credit;
Iif (typeof credit === "string") {
credit = new Credit(credit);
}
this._credit = credit;
this._tileWidth = 256;
this._tileHeight = 256;
this._maximumLevel = 23;
// Install the default tile discard policy if none has been supplied.
Eif (!defined(this._tileDiscardPolicy)) {
this._tileDiscardPolicy = new GoogleEarthEnterpriseDiscardPolicy();
}
this._errorEvent = new Event();
}
Object.defineProperties(GoogleEarthEnterpriseImageryProvider.prototype, {
/**
* Gets the name of the Google Earth Enterprise server url hosting the imagery.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {string}
* @readonly
*/
url: {
get: function () {
return this._metadata.url;
},
},
/**
* Gets the proxy used by this provider.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {Proxy}
* @readonly
*/
proxy: {
get: function () {
return this._metadata.proxy;
},
},
/**
* Gets the width of each tile, in pixels.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {number}
* @readonly
*/
tileWidth: {
get: function () {
return this._tileWidth;
},
},
/**
* Gets the height of each tile, in pixels.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {number}
* @readonly
*/
tileHeight: {
get: function () {
return this._tileHeight;
},
},
/**
* Gets the maximum level-of-detail that can be requested.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {number|undefined}
* @readonly
*/
maximumLevel: {
get: function () {
return this._maximumLevel;
},
},
/**
* Gets the minimum level-of-detail that can be requested.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {number}
* @readonly
*/
minimumLevel: {
get: function () {
return 0;
},
},
/**
* Gets the tiling scheme used by this provider.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {TilingScheme}
* @readonly
*/
tilingScheme: {
get: function () {
return this._tilingScheme;
},
},
/**
* Gets the rectangle, in radians, of the imagery provided by this instance.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {Rectangle}
* @readonly
*/
rectangle: {
get: function () {
return this._tilingScheme.rectangle;
},
},
/**
* Gets the tile discard policy. If not undefined, the discard policy is responsible
* for filtering out "missing" tiles via its shouldDiscardImage function. If this function
* returns undefined, no tiles are filtered.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {TileDiscardPolicy}
* @readonly
*/
tileDiscardPolicy: {
get: function () {
return this._tileDiscardPolicy;
},
},
/**
* Gets an event that is raised when the imagery provider encounters an asynchronous error. By subscribing
* to the event, you will be notified of the error and can potentially recover from it. Event listeners
* are passed an instance of {@link TileProviderError}.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {Event}
* @readonly
*/
errorEvent: {
get: function () {
return this._errorEvent;
},
},
/**
* Gets the credit to display when this imagery provider is active. Typically this is used to credit
* the source of the imagery.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {Credit}
* @readonly
*/
credit: {
get: function () {
return this._credit;
},
},
/**
* Gets a value indicating whether or not the images provided by this imagery provider
* include an alpha channel. If this property is false, an alpha channel, if present, will
* be ignored. If this property is true, any images without an alpha channel will be treated
* as if their alpha is 1.0 everywhere. Setting this property to false reduces memory usage
* and texture upload time.
* @memberof GoogleEarthEnterpriseImageryProvider.prototype
* @type {boolean}
* @readonly
*/
hasAlphaChannel: {
get: function () {
return false;
},
},
});
/**
* Creates a tiled imagery provider using the Google Earth Enterprise REST API.
* @param {GoogleEarthEnterpriseMetadata} metadata A metadata object that can be used to share metadata requests with a GoogleEarthEnterpriseTerrainProvider.
* @param {GoogleEarthEnterpriseImageryProvider.ConstructorOptions} options Object describing initialization options.
* @returns {GoogleEarthEnterpriseImageryProvider}
*
* @exception {RuntimeError} The metadata url does not have imagery
*
* @example
* const geeMetadata = await GoogleEarthEnterpriseMetadata.fromUrl("http://www.example.com");
* const gee = Cesium.GoogleEarthEnterpriseImageryProvider.fromMetadata(geeMetadata);
*/
GoogleEarthEnterpriseImageryProvider.fromMetadata = function (
metadata,
options,
) {
//>>includeStart('debug', pragmas.debug);
Check.defined("metadata", metadata);
//>>includeEnd('debug');
if (!metadata.imageryPresent) {
throw new RuntimeError(`The server ${metadata.url} doesn't have imagery`);
}
const provider = new GoogleEarthEnterpriseImageryProvider(options);
provider._metadata = metadata;
return provider;
};
/**
* 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.
*/
GoogleEarthEnterpriseImageryProvider.prototype.getTileCredits = function (
x,
y,
level,
) {
const metadata = this._metadata;
const info = metadata.getTileInformation(x, y, level);
Eif (defined(info)) {
const credit = metadata.providers[info.imageryProvider];
Iif (defined(credit)) {
return [credit];
}
}
return undefined;
};
/**
* Requests the image for a given tile.
*
* @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<ImageryTypes>|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.
*/
GoogleEarthEnterpriseImageryProvider.prototype.requestImage = function (
x,
y,
level,
request,
) {
const invalidImage = this._tileDiscardPolicy._image; // Empty image or undefined depending on discard policy
const metadata = this._metadata;
const quadKey = GoogleEarthEnterpriseMetadata.tileXYToQuadKey(x, y, level);
const info = metadata.getTileInformation(x, y, level);
Iif (!defined(info)) {
if (metadata.isValid(quadKey)) {
const 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 Promise.resolve(invalidImage); // Image doesn't exist
}
Iif (!info.hasImagery()) {
// Already have info and there isn't any imagery here
return Promise.resolve(invalidImage);
}
const promise = buildImageResource(
this,
info,
x,
y,
level,
request,
).fetchArrayBuffer();
Iif (!defined(promise)) {
return undefined; // Throttled
}
return promise.then(function (image) {
decodeGoogleEarthEnterpriseData(metadata.key, image);
let a = new Uint8Array(image);
let type;
const protoImagery = metadata.protoImagery;
Eif (!defined(protoImagery) || !protoImagery) {
type = getImageType(a);
}
Iif (!defined(type) && (!defined(protoImagery) || protoImagery)) {
const message = decodeEarthImageryPacket(a);
type = message.imageType;
a = message.imageData;
}
Iif (!defined(type) || !defined(a)) {
return invalidImage;
}
return loadImageFromTypedArray({
uint8Array: a,
format: type,
flipY: true,
});
});
};
/**
* 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 {undefined} Undefined since 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) {
const quadKey = GoogleEarthEnterpriseMetadata.tileXYToQuadKey(x, y, level);
let 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) {
const jpeg = "JFIF";
Iif (
image[6] === jpeg.charCodeAt(0) &&
image[7] === jpeg.charCodeAt(1) &&
image[8] === jpeg.charCodeAt(2) &&
image[9] === jpeg.charCodeAt(3)
) {
return "image/jpeg";
}
const png = "PNG";
Eif (
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) {
const reader = protobuf.Reader.create(data);
const end = reader.len;
const message = {};
while (reader.pos < end) {
const tag = reader.uint32();
let copyrightIds;
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:
copyrightIds = message.copyrightIds;
if (!defined(copyrightIds)) {
copyrightIds = message.copyrightIds = [];
}
if ((tag & 7) === 2) {
const 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;
}
}
const 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.",
);
}
}
const alphaType = message.alphaType;
if (defined(alphaType) && alphaType !== 0) {
console.log(
"GoogleEarthEnterpriseImageryProvider: External alpha not supported.",
);
delete message.alphaType;
delete message.imageAlpha;
}
return message;
}
export default GoogleEarthEnterpriseImageryProvider;
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