Merge pull request #9778 from ahocevar/faster-getsourcetiles
Return existing source tiles if at target resolution
This commit is contained in:
Andreas Hocevar
GitHub
@@ -179,99 +179,101 @@ class VectorTile extends UrlTile {
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* @return {Array<import("../VectorTile").default>} Tile keys.
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*/
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getSourceTiles(pixelRatio, projection, tile) {
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const sourceTiles = [];
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const urlTileCoord = tile.wrappedTileCoord;
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if (urlTileCoord) {
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const tileGrid = this.getTileGridForProjection(projection);
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const extent = tileGrid.getTileCoordExtent(urlTileCoord);
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const z = urlTileCoord[0];
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const resolution = tileGrid.getResolution(z);
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// make extent 1 pixel smaller so we don't load tiles for < 0.5 pixel render space
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bufferExtent(extent, -1 / resolution, extent);
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const sourceTileGrid = this.tileGrid;
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const sourceExtent = sourceTileGrid.getExtent();
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if (sourceExtent) {
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getIntersection(extent, sourceExtent, extent);
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}
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const sourceZ = sourceTileGrid.getZForResolution(resolution, 1);
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const minZoom = sourceTileGrid.getMinZoom();
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const tileGrid = this.getTileGridForProjection(projection);
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const extent = tileGrid.getTileCoordExtent(urlTileCoord);
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const z = urlTileCoord[0];
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const resolution = tileGrid.getResolution(z);
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// make extent 1 pixel smaller so we don't load tiles for < 0.5 pixel render space
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bufferExtent(extent, -1 / resolution, extent);
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const sourceTileGrid = this.tileGrid;
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const sourceExtent = sourceTileGrid.getExtent();
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if (sourceExtent) {
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getIntersection(extent, sourceExtent, extent);
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}
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const sourceZ = sourceTileGrid.getZForResolution(resolution, 1);
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const minZoom = sourceTileGrid.getMinZoom();
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let loadedZ = sourceZ + 1;
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let covered, empty;
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do {
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--loadedZ;
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covered = true;
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empty = true;
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sourceTileGrid.forEachTileCoord(extent, loadedZ, function(sourceTileCoord) {
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const tileKey = getKey(sourceTileCoord);
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let sourceTile;
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if (tileKey in this.sourceTiles_) {
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sourceTile = this.sourceTiles_[tileKey];
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const state = sourceTile.getState();
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if (state === TileState.LOADED || state === TileState.ERROR || state === TileState.EMPTY) {
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empty = empty && state === TileState.EMPTY;
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sourceTiles.push(sourceTile);
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return;
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}
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} else if (loadedZ === sourceZ) {
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const tileUrl = this.tileUrlFunction(sourceTileCoord, pixelRatio, projection);
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if (tileUrl !== undefined) {
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sourceTile = new this.tileClass(sourceTileCoord, TileState.IDLE, tileUrl,
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this.format_, this.tileLoadFunction);
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sourceTile.extent = sourceTileGrid.getTileCoordExtent(sourceTileCoord);
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sourceTile.projection = projection;
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sourceTile.resolution = sourceTileGrid.getResolution(sourceTileCoord[0]);
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this.sourceTiles_[tileKey] = sourceTile;
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empty = false;
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listen(sourceTile, EventType.CHANGE, this.handleTileChange, this);
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sourceTile.load();
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}
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} else {
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empty = false;
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}
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covered = false;
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if (!sourceTile) {
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const previousSourceTiles = this.sourceTilesByTileKey_[getKey(tile.tileCoord)];
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if (previousSourceTiles && previousSourceTiles.length > 0 && previousSourceTiles[0].tileCoord[0] === sourceZ) {
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return previousSourceTiles;
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}
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const sourceTiles = [];
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let loadedZ = sourceZ + 1;
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let covered, empty;
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do {
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--loadedZ;
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covered = true;
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empty = true;
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sourceTileGrid.forEachTileCoord(extent, loadedZ, function(sourceTileCoord) {
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const tileKey = getKey(sourceTileCoord);
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let sourceTile;
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if (tileKey in this.sourceTiles_) {
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sourceTile = this.sourceTiles_[tileKey];
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const state = sourceTile.getState();
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if (state === TileState.LOADED || state === TileState.ERROR || state === TileState.EMPTY) {
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empty = empty && state === TileState.EMPTY;
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sourceTiles.push(sourceTile);
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return;
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}
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if (sourceTile.getState() !== TileState.EMPTY && tile.getState() === TileState.IDLE) {
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tile.loadingSourceTiles++;
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const key = listen(sourceTile, EventType.CHANGE, function() {
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const state = sourceTile.getState();
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const sourceTileKey = getKey(sourceTile.tileCoord);
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if (state === TileState.LOADED || state === TileState.ERROR) {
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if (state === TileState.LOADED) {
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unlistenByKey(key);
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tile.loadingSourceTiles--;
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delete tile.errorSourceTileKeys[sourceTileKey];
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} else if (state === TileState.ERROR) {
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tile.errorSourceTileKeys[sourceTileKey] = true;
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}
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if (tile.loadingSourceTiles - Object.keys(tile.errorSourceTileKeys).length === 0) {
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tile.hifi = true;
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tile.sourceZ = sourceZ;
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tile.setState(isEmpty(tile.errorSourceTileKeys) ? TileState.LOADED : TileState.ERROR);
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}
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}
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});
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} else if (loadedZ === sourceZ) {
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const tileUrl = this.tileUrlFunction(sourceTileCoord, pixelRatio, projection);
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if (tileUrl !== undefined) {
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sourceTile = new this.tileClass(sourceTileCoord, TileState.IDLE, tileUrl,
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this.format_, this.tileLoadFunction);
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sourceTile.extent = sourceTileGrid.getTileCoordExtent(sourceTileCoord);
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sourceTile.projection = projection;
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sourceTile.resolution = sourceTileGrid.getResolution(sourceTileCoord[0]);
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this.sourceTiles_[tileKey] = sourceTile;
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empty = false;
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listen(sourceTile, EventType.CHANGE, this.handleTileChange, this);
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sourceTile.load();
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}
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}.bind(this));
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if (!covered) {
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sourceTiles.length = 0;
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} else {
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empty = false;
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}
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} while (!covered && loadedZ > minZoom);
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if (!empty && tile.getState() === TileState.IDLE) {
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tile.setState(TileState.LOADING);
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covered = false;
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if (!sourceTile) {
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return;
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}
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if (sourceTile.getState() !== TileState.EMPTY && tile.getState() === TileState.IDLE) {
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tile.loadingSourceTiles++;
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const key = listen(sourceTile, EventType.CHANGE, function() {
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const state = sourceTile.getState();
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const sourceTileKey = getKey(sourceTile.tileCoord);
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if (state === TileState.LOADED || state === TileState.ERROR) {
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if (state === TileState.LOADED) {
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unlistenByKey(key);
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tile.loadingSourceTiles--;
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delete tile.errorSourceTileKeys[sourceTileKey];
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} else if (state === TileState.ERROR) {
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tile.errorSourceTileKeys[sourceTileKey] = true;
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}
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if (tile.loadingSourceTiles - Object.keys(tile.errorSourceTileKeys).length === 0) {
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tile.hifi = true;
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tile.sourceZ = sourceZ;
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tile.setState(isEmpty(tile.errorSourceTileKeys) ? TileState.LOADED : TileState.ERROR);
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}
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}
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});
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}
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}.bind(this));
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if (!covered) {
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sourceTiles.length = 0;
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}
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if (covered || empty) {
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tile.hifi = sourceZ === loadedZ;
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tile.sourceZ = loadedZ;
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const previousSourceTiles = this.sourceTilesByTileKey_[getKey(tile.tileCoord)];
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if (tile.getState() < TileState.LOADED) {
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tile.setState(empty ? TileState.EMPTY : TileState.LOADED);
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} else if (!previousSourceTiles || !equals(sourceTiles, previousSourceTiles)) {
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this.removeSourceTiles(tile);
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this.addSourceTiles(tile, sourceTiles);
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}
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} while (!covered && loadedZ > minZoom);
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if (!empty && tile.getState() === TileState.IDLE) {
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tile.setState(TileState.LOADING);
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}
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if (covered || empty) {
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tile.hifi = sourceZ === loadedZ;
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tile.sourceZ = loadedZ;
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if (tile.getState() < TileState.LOADED) {
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tile.setState(empty ? TileState.EMPTY : TileState.LOADED);
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} else if (!previousSourceTiles || !equals(sourceTiles, previousSourceTiles)) {
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this.removeSourceTiles(tile);
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this.addSourceTiles(tile, sourceTiles);
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}
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}
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return sourceTiles;
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