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import {ensureError, extend, pick} from '../util/util';
import {ImageRequest} from '../util/image_request';
import {ResourceType} from '../util/request_manager';
import {Event, ErrorEvent, Evented} from '../util/evented';
import {loadTileJson} from './load_tilejson';
import {TileBounds} from '../tile/tile_bounds';
import {Texture} from '../webgl/texture';
import {isAbortError} from '../util/abort_error';
import type {Source} from './source';
import type {OverscaledTileID} from '../tile/tile_id';
import type {Map} from '../ui/map';
import type {Dispatcher} from '../util/dispatcher';
import type {Tile} from '../tile/tile';
import type {
RasterSourceSpecification,
RasterDEMSourceSpecification
} from '@maplibre/maplibre-gl-style-spec';
/**
* A source containing raster tiles (See the [raster source documentation](https://maplibre.org/maplibre-style-spec/sources/#raster) for detailed documentation of options.)
*
* @group Sources
*
* \> ℹ️ **Note:** The default `tileSize` is `512`. If your tile provider (such as OpenStreetMap or Stadia Maps) serves 256px tiles, set `tileSize: 256` manually to avoid blurry rendering due to upscaling.
*
* @example
* ```ts
* map.addSource('raster-source', {
* 'type': 'raster',
* 'tiles': ['https://tiles.stadiamaps.com/tiles/stamen_watercolor/{z}/{x}/{y}.jpg'],
* 'tileSize': 256, // Set this to match tile server output to avoid blurry rendering
* });
* ```
*
* @example
* ```ts
* map.addSource('wms-test-source', {
* 'type': 'raster',
* // use the tiles option to specify a WMS tile source URL
* 'tiles': [
* 'https://img.nj.gov/imagerywms/Natural2015?bbox={bbox-epsg-3857}&format=image/png&service=WMS&version=1.1.1&request=GetMap&srs=EPSG:3857&transparent=true&width=256&height=256&layers=Natural2015'
* ],
* 'tileSize': 256 // Important for WMS if tiles are 256px
* });
* ```
* @see [Add a raster tile source](https://maplibre.org/maplibre-gl-js/docs/examples/map-tiles/)
* @see [Add a WMS source](https://maplibre.org/maplibre-gl-js/docs/examples/add-a-wms-source/)
* @see [Display a satellite map](https://maplibre.org/maplibre-gl-js/docs/examples/display-a-satellite-map/)
*/
export class RasterTileSource extends Evented implements Source {
type: 'raster' | 'raster-dem';
id: string;
minzoom: number;
maxzoom: number;
url: string;
scheme: string;
tileSize: number;
bounds: [number, number, number, number];
tileBounds: TileBounds;
roundZoom: boolean;
dispatcher: Dispatcher;
map: Map;
tiles: string[];
_loaded: boolean;
_options: RasterSourceSpecification | RasterDEMSourceSpecification;
_tileJSONRequest: AbortController;
constructor(id: string, options: RasterSourceSpecification | RasterDEMSourceSpecification, dispatcher: Dispatcher, eventedParent: Evented) {
super();
this.id = id;
this.dispatcher = dispatcher;
this.setEventedParent(eventedParent);
this.type = 'raster';
this.minzoom = 0;
this.maxzoom = 22;
this.roundZoom = true;
this.scheme = 'xyz';
this.tileSize = 512;
this._loaded = false;
this._options = extend({type: 'raster'}, options);
extend(this, pick(options, ['url', 'scheme', 'tileSize']));
}
async load(sourceDataChanged: boolean = false) {
this._loaded = false;
this.fire(new Event('dataloading', {dataType: 'source'}));
this._tileJSONRequest = new AbortController();
try {
const tileJSON = await loadTileJson(this._options, this.map._requestManager, this._tileJSONRequest, this.map._ownerWindow);
this._tileJSONRequest = null;
this._loaded = true;
if (tileJSON) {
extend(this, tileJSON);
if (tileJSON.bounds) this.tileBounds = new TileBounds(tileJSON.bounds, this.minzoom, this.maxzoom);
// `content` is included here to prevent a race condition where `Style._updateSources` is called
// before the TileJSON arrives. this makes sure the tiles needed are loaded once TileJSON arrives
// ref: https://github.com/mapbox/mapbox-gl-js/pull/4347#discussion_r104418088
this.fire(new Event('data', {dataType: 'source', sourceDataType: 'metadata'}));
this.fire(new Event('data', {dataType: 'source', sourceDataType: 'content', sourceDataChanged}));
}
} catch (err) {
this._tileJSONRequest = null;
this._loaded = true; // let's pretend it's loaded so the source will be ignored
// only fire error event if it is not due to aborting the request
if (!isAbortError(err)) {
this.fire(new ErrorEvent(ensureError(err)));
}
}
}
loaded(): boolean {
return this._loaded;
}
onAdd(map: Map) {
this.map = map;
this.load();
}
onRemove() {
if (this._tileJSONRequest) {
this._tileJSONRequest.abort();
this._tileJSONRequest = null;
}
}
setSourceProperty(callback: Function) {
if (this._tileJSONRequest) {
this._tileJSONRequest.abort();
this._tileJSONRequest = null;
}
callback();
this.load(true);
}
/**
* Sets the source `tiles` property and re-renders the map.
*
* @param tiles - An array of one or more tile source URLs, as in the raster tiles spec (See the [Style Specification](https://maplibre.org/maplibre-style-spec/)
*/
setTiles(tiles: string[]): this {
this.setSourceProperty(() => {
this._options.tiles = tiles;
});
return this;
}
/**
* Sets the source `url` property and re-renders the map.
*
* @param url - A URL to a TileJSON resource. Supported protocols are `http:` and `https:`.
*/
setUrl(url: string): this {
this.setSourceProperty(() => {
this.url = url;
this._options.url = url;
});
return this;
}
serialize() {
return extend({}, this._options);
}
hasTile(tileID: OverscaledTileID) {
return !this.tileBounds || this.tileBounds.contains(tileID.canonical);
}
async loadTile(tile: Tile): Promise<void> {
const url = tile.tileID.canonical.url(this.tiles, this.map.getPixelRatio(), this.scheme);
tile.abortController = new AbortController();
try {
const response = await ImageRequest.getImage(await this.map._requestManager.transformRequest(url, ResourceType.Tile), tile.abortController, this.map._refreshExpiredTiles);
delete tile.abortController;
if (tile.aborted) {
tile.state = 'unloaded';
return;
}
if (response?.data) {
if (this.map._refreshExpiredTiles && (response.cacheControl || response.expires)) {
tile.setExpiryData({cacheControl: response.cacheControl, expires: response.expires});
}
const context = this.map.painter.context;
const gl = context.gl;
const img = response.data;
tile.texture = this.map.painter.getTileTexture(img.width);
if (tile.texture) {
tile.texture.update(img, {useMipmap: true});
} else {
tile.texture = new Texture(context, img, gl.RGBA, {useMipmap: true});
tile.texture.bind(gl.LINEAR, gl.CLAMP_TO_EDGE, gl.LINEAR_MIPMAP_NEAREST);
}
tile.state = 'loaded';
}
} catch (err) {
delete tile.abortController;
if (tile.aborted) {
tile.state = 'unloaded';
} else if (err) {
tile.state = 'errored';
throw err;
}
}
}
async abortTile(tile: Tile) {
if (tile.abortController) {
tile.abortController.abort();
delete tile.abortController;
}
}
async unloadTile(tile: Tile) {
if (tile.texture) {
this.map.painter.saveTileTexture(tile.texture);
}
}
hasTransition() {
return false;
}
}