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raster_tile_source.js
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raster_tile_source.js
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// @flow
import { extend, pick } from '../util/util';
import { getImage, ResourceType } from '../util/ajax';
import { Event, ErrorEvent, Evented } from '../util/evented';
import loadTileJSON from './load_tilejson';
import { normalizeTileURL as normalizeURL } from '../util/mapbox';
import TileBounds from './tile_bounds';
import Texture from '../render/texture';
import type {Source} from './source';
import type {OverscaledTileID} from './tile_id';
import type Map from '../ui/map';
import type Dispatcher from '../util/dispatcher';
import type Tile from './tile';
import type {Callback} from '../types/callback';
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: Array<string>;
_loaded: boolean;
_options: RasterSourceSpecification | RasterDEMSourceSpecification;
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({}, options);
extend(this, pick(options, ['url', 'scheme', 'tileSize']));
}
load() {
this.fire(new Event('dataloading', {dataType: 'source'}));
loadTileJSON(this._options, this.map._transformRequest, (err, tileJSON) => {
if (err) {
this.fire(new ErrorEvent(err));
} else 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'}));
}
});
}
onAdd(map: Map) {
this.map = map;
this.load();
}
serialize() {
return extend({}, this._options);
}
hasTile(tileID: OverscaledTileID) {
return !this.tileBounds || this.tileBounds.contains(tileID.canonical);
}
loadTile(tile: Tile, callback: Callback<void>) {
const url = normalizeURL(tile.tileID.canonical.url(this.tiles, this.scheme), this.url, this.tileSize);
tile.request = getImage(this.map._transformRequest(url, ResourceType.Tile), (err, img) => {
delete tile.request;
if (tile.aborted) {
tile.state = 'unloaded';
callback(null);
} else if (err) {
tile.state = 'errored';
callback(err);
} else if (img) {
if (this.map._refreshExpiredTiles) tile.setExpiryData(img);
delete (img: any).cacheControl;
delete (img: any).expires;
const context = this.map.painter.context;
const gl = context.gl;
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);
if (context.extTextureFilterAnisotropic) {
gl.texParameterf(gl.TEXTURE_2D, context.extTextureFilterAnisotropic.TEXTURE_MAX_ANISOTROPY_EXT, context.extTextureFilterAnisotropicMax);
}
}
tile.state = 'loaded';
callback(null);
}
});
}
abortTile(tile: Tile, callback: Callback<void>) {
if (tile.request) {
tile.request.abort();
delete tile.request;
}
callback();
}
unloadTile(tile: Tile, callback: Callback<void>) {
if (tile.texture) this.map.painter.saveTileTexture(tile.texture);
callback();
}
hasTransition() {
return false;
}
}
export default RasterTileSource;