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image_source.ts
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image_source.ts
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import {CanonicalTileID} from './tile_id';
import {Event, ErrorEvent, Evented} from '../util/evented';
import {ImageRequest} from '../util/image_request';
import {ResourceType} from '../util/request_manager';
import {EXTENT} from '../data/extent';
import {RasterBoundsArray} from '../data/array_types.g';
import rasterBoundsAttributes from '../data/raster_bounds_attributes';
import {SegmentVector} from '../data/segment';
import {Texture} from '../render/texture';
import {MercatorCoordinate} from '../geo/mercator_coordinate';
import type {Source} from './source';
import type {CanvasSourceSpecification} from './canvas_source';
import type {Map} from '../ui/map';
import type {Dispatcher} from '../util/dispatcher';
import type {Tile} from './tile';
import type {VertexBuffer} from '../gl/vertex_buffer';
import type {
ImageSourceSpecification,
VideoSourceSpecification
} from '@maplibre/maplibre-gl-style-spec';
/**
* Four geographical coordinates,
* represented as arrays of longitude and latitude numbers, which define the corners of the image.
* The coordinates start at the top left corner of the image and proceed in clockwise order.
* They do not have to represent a rectangle.
*/
export type Coordinates = [[number, number], [number, number], [number, number], [number, number]];
/**
* The options object for the {@link ImageSource#updateImage} method
*/
export type UpdateImageOptions = {
/**
* Required image URL.
*/
url: string;
/**
* The image coordinates
*/
coordinates?: Coordinates;
}
/**
* A data source containing an image.
* (See the [Style Specification](https://maplibre.org/maplibre-style-spec/#sources-image) for detailed documentation of options.)
*
* @group Sources
*
* @example
* ```ts
* // add to map
* map.addSource('some id', {
* type: 'image',
* url: 'https://www.maplibre.org/images/foo.png',
* coordinates: [
* [-76.54, 39.18],
* [-76.52, 39.18],
* [-76.52, 39.17],
* [-76.54, 39.17]
* ]
* });
*
* // update coordinates
* let mySource = map.getSource('some id');
* mySource.setCoordinates([
* [-76.54335737228394, 39.18579907229748],
* [-76.52803659439087, 39.1838364847587],
* [-76.5295386314392, 39.17683392507606],
* [-76.54520273208618, 39.17876344106642]
* ]);
*
* // update url and coordinates simultaneously
* mySource.updateImage({
* url: 'https://www.maplibre.org/images/bar.png',
* coordinates: [
* [-76.54335737228394, 39.18579907229748],
* [-76.52803659439087, 39.1838364847587],
* [-76.5295386314392, 39.17683392507606],
* [-76.54520273208618, 39.17876344106642]
* ]
* })
*
* map.removeSource('some id'); // remove
* ```
*/
export class ImageSource extends Evented implements Source {
type: string;
id: string;
minzoom: number;
maxzoom: number;
tileSize: number;
url: string;
coordinates: Coordinates;
tiles: {[_: string]: Tile};
options: any;
dispatcher: Dispatcher;
map: Map;
texture: Texture | null;
image: HTMLImageElement | ImageBitmap;
tileID: CanonicalTileID;
_boundsArray: RasterBoundsArray;
boundsBuffer: VertexBuffer;
boundsSegments: SegmentVector;
_loaded: boolean;
_request: AbortController;
/** @internal */
constructor(id: string, options: ImageSourceSpecification | VideoSourceSpecification | CanvasSourceSpecification, dispatcher: Dispatcher, eventedParent: Evented) {
super();
this.id = id;
this.dispatcher = dispatcher;
this.coordinates = options.coordinates;
this.type = 'image';
this.minzoom = 0;
this.maxzoom = 22;
this.tileSize = 512;
this.tiles = {};
this._loaded = false;
this.setEventedParent(eventedParent);
this.options = options;
}
async load(newCoordinates?: Coordinates): Promise<void> {
this._loaded = false;
this.fire(new Event('dataloading', {dataType: 'source'}));
this.url = this.options.url;
this._request = new AbortController();
try {
const image = await ImageRequest.getImage(this.map._requestManager.transformRequest(this.url, ResourceType.Image), this._request);
this._request = null;
this._loaded = true;
if (image && image.data) {
this.image = image.data;
if (newCoordinates) {
this.coordinates = newCoordinates;
}
this._finishLoading();
}
} catch (err) {
this._request = null;
this._loaded = true;
this.fire(new ErrorEvent(err));
}
}
loaded(): boolean {
return this._loaded;
}
/**
* Updates the image URL and, optionally, the coordinates. To avoid having the image flash after changing,
* set the `raster-fade-duration` paint property on the raster layer to 0.
*
* @param options - The options object.
*/
updateImage(options: UpdateImageOptions): this {
if (!options.url) {
return this;
}
if (this._request) {
this._request.abort();
this._request = null;
}
this.options.url = options.url;
this.load(options.coordinates).finally(() => { this.texture = null; });
return this;
}
_finishLoading() {
if (this.map) {
this.setCoordinates(this.coordinates);
this.fire(new Event('data', {dataType: 'source', sourceDataType: 'metadata'}));
}
}
onAdd(map: Map) {
this.map = map;
this.load();
}
onRemove() {
if (this._request) {
this._request.abort();
this._request = null;
}
}
/**
* Sets the image's coordinates and re-renders the map.
*
* @param coordinates - Four geographical coordinates,
* represented as arrays of longitude and latitude numbers, which define the corners of the image.
* The coordinates start at the top left corner of the image and proceed in clockwise order.
* They do not have to represent a rectangle.
*/
setCoordinates(coordinates: Coordinates): this {
this.coordinates = coordinates;
// Calculate which mercator tile is suitable for rendering the video in
// and create a buffer with the corner coordinates. These coordinates
// may be outside the tile, because raster tiles aren't clipped when rendering.
// transform the geo coordinates into (zoom 0) tile space coordinates
const cornerCoords = coordinates.map(MercatorCoordinate.fromLngLat);
// Compute the coordinates of the tile we'll use to hold this image's
// render data
this.tileID = getCoordinatesCenterTileID(cornerCoords);
// Constrain min/max zoom to our tile's zoom level in order to force
// SourceCache to request this tile (no matter what the map's zoom
// level)
this.minzoom = this.maxzoom = this.tileID.z;
// Transform the corner coordinates into the coordinate space of our
// tile.
const tileCoords = cornerCoords.map((coord) => this.tileID.getTilePoint(coord)._round());
this._boundsArray = new RasterBoundsArray();
this._boundsArray.emplaceBack(tileCoords[0].x, tileCoords[0].y, 0, 0);
this._boundsArray.emplaceBack(tileCoords[1].x, tileCoords[1].y, EXTENT, 0);
this._boundsArray.emplaceBack(tileCoords[3].x, tileCoords[3].y, 0, EXTENT);
this._boundsArray.emplaceBack(tileCoords[2].x, tileCoords[2].y, EXTENT, EXTENT);
if (this.boundsBuffer) {
this.boundsBuffer.destroy();
delete this.boundsBuffer;
}
this.fire(new Event('data', {dataType: 'source', sourceDataType: 'content'}));
return this;
}
prepare() {
if (Object.keys(this.tiles).length === 0 || !this.image) {
return;
}
const context = this.map.painter.context;
const gl = context.gl;
if (!this.boundsBuffer) {
this.boundsBuffer = context.createVertexBuffer(this._boundsArray, rasterBoundsAttributes.members);
}
if (!this.boundsSegments) {
this.boundsSegments = SegmentVector.simpleSegment(0, 0, 4, 2);
}
if (!this.texture) {
this.texture = new Texture(context, this.image, gl.RGBA);
this.texture.bind(gl.LINEAR, gl.CLAMP_TO_EDGE);
}
let newTilesLoaded = false;
for (const w in this.tiles) {
const tile = this.tiles[w];
if (tile.state !== 'loaded') {
tile.state = 'loaded';
tile.texture = this.texture;
newTilesLoaded = true;
}
}
if (newTilesLoaded) {
this.fire(new Event('data', {dataType: 'source', sourceDataType: 'idle', sourceId: this.id}));
}
}
async loadTile(tile: Tile): Promise<void> {
// We have a single tile -- whose coordinates are this.tileID -- that
// covers the image we want to render. If that's the one being
// requested, set it up with the image; otherwise, mark the tile as
// `errored` to indicate that we have no data for it.
// If the world wraps, we may have multiple "wrapped" copies of the
// single tile.
if (this.tileID && this.tileID.equals(tile.tileID.canonical)) {
this.tiles[String(tile.tileID.wrap)] = tile;
tile.buckets = {};
} else {
tile.state = 'errored';
}
}
serialize(): ImageSourceSpecification | VideoSourceSpecification | CanvasSourceSpecification {
return {
type: 'image',
url: this.options.url,
coordinates: this.coordinates
};
}
hasTransition() {
return false;
}
}
/**
* Given a list of coordinates, get their center as a coordinate.
*
* @returns centerpoint
* @internal
*/
export function getCoordinatesCenterTileID(coords: Array<MercatorCoordinate>) {
let minX = Infinity;
let minY = Infinity;
let maxX = -Infinity;
let maxY = -Infinity;
for (const coord of coords) {
minX = Math.min(minX, coord.x);
minY = Math.min(minY, coord.y);
maxX = Math.max(maxX, coord.x);
maxY = Math.max(maxY, coord.y);
}
const dx = maxX - minX;
const dy = maxY - minY;
const dMax = Math.max(dx, dy);
const zoom = Math.max(0, Math.floor(-Math.log(dMax) / Math.LN2));
const tilesAtZoom = Math.pow(2, zoom);
return new CanonicalTileID(
zoom,
Math.floor((minX + maxX) / 2 * tilesAtZoom),
Math.floor((minY + maxY) / 2 * tilesAtZoom));
}