Adding debian version 1.1.0-4.debian/1.1.0-4debian

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 930 insertions, 0 deletions

diff --git a/debian/missing-sources/leaflet.js/layer/tile/GridLayer.js b/debian/missing-sources/leaflet.js/layer/tile/GridLayer.js
new file mode 100755
index 0000000..5716820
--- /dev/null
+++ b/debian/missing-sources/leaflet.js/layer/tile/GridLayer.js
@@ -0,0 +1,930 @@
+import {Layer} from '../Layer';
+import * as Browser from '../../core/Browser';
+import * as Util from '../../core/Util';
+import * as DomUtil from '../../dom/DomUtil';
+import {Point} from '../../geometry/Point';
+import {Bounds} from '../../geometry/Bounds';
+import {LatLngBounds, toLatLngBounds as latLngBounds} from '../../geo/LatLngBounds';
+
+/*
+ * @class GridLayer
+ * @inherits Layer
+ * @aka L.GridLayer
+ *
+ * Generic class for handling a tiled grid of HTML elements. This is the base class for all tile layers and replaces `TileLayer.Canvas`.
+ * GridLayer can be extended to create a tiled grid of HTML elements like `<canvas>`, `<img>` or `<div>`. GridLayer will handle creating and animating these DOM elements for you.
+ *
+ *
+ * @section Synchronous usage
+ * @example
+ *
+ * To create a custom layer, extend GridLayer and implement the `createTile()` method, which will be passed a `Point` object with the `x`, `y`, and `z` (zoom level) coordinates to draw your tile.
+ *
+ * ```js
+ * var CanvasLayer = L.GridLayer.extend({
+ *     createTile: function(coords){
+ *         // create a <canvas> element for drawing
+ *         var tile = L.DomUtil.create('canvas', 'leaflet-tile');
+ *
+ *         // setup tile width and height according to the options
+ *         var size = this.getTileSize();
+ *         tile.width = size.x;
+ *         tile.height = size.y;
+ *
+ *         // get a canvas context and draw something on it using coords.x, coords.y and coords.z
+ *         var ctx = tile.getContext('2d');
+ *
+ *         // return the tile so it can be rendered on screen
+ *         return tile;
+ *     }
+ * });
+ * ```
+ *
+ * @section Asynchronous usage
+ * @example
+ *
+ * Tile creation can also be asynchronous, this is useful when using a third-party drawing library. Once the tile is finished drawing it can be passed to the `done()` callback.
+ *
+ * ```js
+ * var CanvasLayer = L.GridLayer.extend({
+ *     createTile: function(coords, done){
+ *         var error;
+ *
+ *         // create a <canvas> element for drawing
+ *         var tile = L.DomUtil.create('canvas', 'leaflet-tile');
+ *
+ *         // setup tile width and height according to the options
+ *         var size = this.getTileSize();
+ *         tile.width = size.x;
+ *         tile.height = size.y;
+ *
+ *         // draw something asynchronously and pass the tile to the done() callback
+ *         setTimeout(function() {
+ *             done(error, tile);
+ *         }, 1000);
+ *
+ *         return tile;
+ *     }
+ * });
+ * ```
+ *
+ * @section
+ */
+
+
+export var GridLayer = Layer.extend({
+
+	// @section
+	// @aka GridLayer options
+	options: {
+		// @option tileSize: Number|Point = 256
+		// Width and height of tiles in the grid. Use a number if width and height are equal, or `L.point(width, height)` otherwise.
+		tileSize: 256,
+
+		// @option opacity: Number = 1.0
+		// Opacity of the tiles. Can be used in the `createTile()` function.
+		opacity: 1,
+
+		// @option updateWhenIdle: Boolean = (depends)
+		// Load new tiles only when panning ends.
+		// `true` by default on mobile browsers, in order to avoid too many requests and keep smooth navigation.
+		// `false` otherwise in order to display new tiles _during_ panning, since it is easy to pan outside the
+		// [`keepBuffer`](#gridlayer-keepbuffer) option in desktop browsers.
+		updateWhenIdle: Browser.mobile,
+
+		// @option updateWhenZooming: Boolean = true
+		// By default, a smooth zoom animation (during a [touch zoom](#map-touchzoom) or a [`flyTo()`](#map-flyto)) will update grid layers every integer zoom level. Setting this option to `false` will update the grid layer only when the smooth animation ends.
+		updateWhenZooming: true,
+
+		// @option updateInterval: Number = 200
+		// Tiles will not update more than once every `updateInterval` milliseconds when panning.
+		updateInterval: 200,
+
+		// @option zIndex: Number = 1
+		// The explicit zIndex of the tile layer.
+		zIndex: 1,
+
+		// @option bounds: LatLngBounds = undefined
+		// If set, tiles will only be loaded inside the set `LatLngBounds`.
+		bounds: null,
+
+		// @option minZoom: Number = 0
+		// The minimum zoom level down to which this layer will be displayed (inclusive).
+		minZoom: 0,
+
+		// @option maxZoom: Number = undefined
+		// The maximum zoom level up to which this layer will be displayed (inclusive).
+		maxZoom: undefined,
+
+		// @option maxNativeZoom: Number = undefined
+		// Maximum zoom number the tile source has available. If it is specified,
+		// the tiles on all zoom levels higher than `maxNativeZoom` will be loaded
+		// from `maxNativeZoom` level and auto-scaled.
+		maxNativeZoom: undefined,
+
+		// @option minNativeZoom: Number = undefined
+		// Minimum zoom number the tile source has available. If it is specified,
+		// the tiles on all zoom levels lower than `minNativeZoom` will be loaded
+		// from `minNativeZoom` level and auto-scaled.
+		minNativeZoom: undefined,
+
+		// @option noWrap: Boolean = false
+		// Whether the layer is wrapped around the antimeridian. If `true`, the
+		// GridLayer will only be displayed once at low zoom levels. Has no
+		// effect when the [map CRS](#map-crs) doesn't wrap around. Can be used
+		// in combination with [`bounds`](#gridlayer-bounds) to prevent requesting
+		// tiles outside the CRS limits.
+		noWrap: false,
+
+		// @option pane: String = 'tilePane'
+		// `Map pane` where the grid layer will be added.
+		pane: 'tilePane',
+
+		// @option className: String = ''
+		// A custom class name to assign to the tile layer. Empty by default.
+		className: '',
+
+		// @option keepBuffer: Number = 2
+		// When panning the map, keep this many rows and columns of tiles before unloading them.
+		keepBuffer: 2
+	},
+
+	initialize: function (options) {
+		Util.setOptions(this, options);
+	},
+
+	onAdd: function () {
+		this._initContainer();
+
+		this._levels = {};
+		this._tiles = {};
+
+		this._resetView();
+		this._update();
+	},
+
+	beforeAdd: function (map) {
+		map._addZoomLimit(this);
+	},
+
+	onRemove: function (map) {
+		this._removeAllTiles();
+		DomUtil.remove(this._container);
+		map._removeZoomLimit(this);
+		this._container = null;
+		this._tileZoom = undefined;
+	},
+
+	// @method bringToFront: this
+	// Brings the tile layer to the top of all tile layers.
+	bringToFront: function () {
+		if (this._map) {
+			DomUtil.toFront(this._container);
+			this._setAutoZIndex(Math.max);
+		}
+		return this;
+	},
+
+	// @method bringToBack: this
+	// Brings the tile layer to the bottom of all tile layers.
+	bringToBack: function () {
+		if (this._map) {
+			DomUtil.toBack(this._container);
+			this._setAutoZIndex(Math.min);
+		}
+		return this;
+	},
+
+	// @method getContainer: HTMLElement
+	// Returns the HTML element that contains the tiles for this layer.
+	getContainer: function () {
+		return this._container;
+	},
+
+	// @method setOpacity(opacity: Number): this
+	// Changes the [opacity](#gridlayer-opacity) of the grid layer.
+	setOpacity: function (opacity) {
+		this.options.opacity = opacity;
+		this._updateOpacity();
+		return this;
+	},
+
+	// @method setZIndex(zIndex: Number): this
+	// Changes the [zIndex](#gridlayer-zindex) of the grid layer.
+	setZIndex: function (zIndex) {
+		this.options.zIndex = zIndex;
+		this._updateZIndex();
+
+		return this;
+	},
+
+	// @method isLoading: Boolean
+	// Returns `true` if any tile in the grid layer has not finished loading.
+	isLoading: function () {
+		return this._loading;
+	},
+
+	// @method redraw: this
+	// Causes the layer to clear all the tiles and request them again.
+	redraw: function () {
+		if (this._map) {
+			this._removeAllTiles();
+			this._update();
+		}
+		return this;
+	},
+
+	getEvents: function () {
+		var events = {
+			viewprereset: this._invalidateAll,
+			viewreset: this._resetView,
+			zoom: this._resetView,
+			moveend: this._onMoveEnd
+		};
+
+		if (!this.options.updateWhenIdle) {
+			// update tiles on move, but not more often than once per given interval
+			if (!this._onMove) {
+				this._onMove = Util.throttle(this._onMoveEnd, this.options.updateInterval, this);
+			}
+
+			events.move = this._onMove;
+		}
+
+		if (this._zoomAnimated) {
+			events.zoomanim = this._animateZoom;
+		}
+
+		return events;
+	},
+
+	// @section Extension methods
+	// Layers extending `GridLayer` shall reimplement the following method.
+	// @method createTile(coords: Object, done?: Function): HTMLElement
+	// Called only internally, must be overridden by classes extending `GridLayer`.
+	// Returns the `HTMLElement` corresponding to the given `coords`. If the `done` callback
+	// is specified, it must be called when the tile has finished loading and drawing.
+	createTile: function () {
+		return document.createElement('div');
+	},
+
+	// @section
+	// @method getTileSize: Point
+	// Normalizes the [tileSize option](#gridlayer-tilesize) into a point. Used by the `createTile()` method.
+	getTileSize: function () {
+		var s = this.options.tileSize;
+		return s instanceof Point ? s : new Point(s, s);
+	},
+
+	_updateZIndex: function () {
+		if (this._container && this.options.zIndex !== undefined && this.options.zIndex !== null) {
+			this._container.style.zIndex = this.options.zIndex;
+		}
+	},
+
+	_setAutoZIndex: function (compare) {
+		// go through all other layers of the same pane, set zIndex to max + 1 (front) or min - 1 (back)
+
+		var layers = this.getPane().children,
+		    edgeZIndex = -compare(-Infinity, Infinity); // -Infinity for max, Infinity for min
+
+		for (var i = 0, len = layers.length, zIndex; i < len; i++) {
+
+			zIndex = layers[i].style.zIndex;
+
+			if (layers[i] !== this._container && zIndex) {
+				edgeZIndex = compare(edgeZIndex, +zIndex);
+			}
+		}
+
+		if (isFinite(edgeZIndex)) {
+			this.options.zIndex = edgeZIndex + compare(-1, 1);
+			this._updateZIndex();
+		}
+	},
+
+	_updateOpacity: function () {
+		if (!this._map) { return; }
+
+		// IE doesn't inherit filter opacity properly, so we're forced to set it on tiles
+		if (Browser.ielt9) { return; }
+
+		DomUtil.setOpacity(this._container, this.options.opacity);
+
+		var now = +new Date(),
+		    nextFrame = false,
+		    willPrune = false;
+
+		for (var key in this._tiles) {
+			var tile = this._tiles[key];
+			if (!tile.current || !tile.loaded) { continue; }
+
+			var fade = Math.min(1, (now - tile.loaded) / 200);
+
+			DomUtil.setOpacity(tile.el, fade);
+			if (fade < 1) {
+				nextFrame = true;
+			} else {
+				if (tile.active) {
+					willPrune = true;
+				} else {
+					this._onOpaqueTile(tile);
+				}
+				tile.active = true;
+			}
+		}
+
+		if (willPrune && !this._noPrune) { this._pruneTiles(); }
+
+		if (nextFrame) {
+			Util.cancelAnimFrame(this._fadeFrame);
+			this._fadeFrame = Util.requestAnimFrame(this._updateOpacity, this);
+		}
+	},
+
+	_onOpaqueTile: Util.falseFn,
+
+	_initContainer: function () {
+		if (this._container) { return; }
+
+		this._container = DomUtil.create('div', 'leaflet-layer ' + (this.options.className || ''));
+		this._updateZIndex();
+
+		if (this.options.opacity < 1) {
+			this._updateOpacity();
+		}
+
+		this.getPane().appendChild(this._container);
+	},
+
+	_updateLevels: function () {
+
+		var zoom = this._tileZoom,
+		    maxZoom = this.options.maxZoom;
+
+		if (zoom === undefined) { return undefined; }
+
+		for (var z in this._levels) {
+			if (this._levels[z].el.children.length || z === zoom) {
+				this._levels[z].el.style.zIndex = maxZoom - Math.abs(zoom - z);
+				this._onUpdateLevel(z);
+			} else {
+				DomUtil.remove(this._levels[z].el);
+				this._removeTilesAtZoom(z);
+				this._onRemoveLevel(z);
+				delete this._levels[z];
+			}
+		}
+
+		var level = this._levels[zoom],
+		    map = this._map;
+
+		if (!level) {
+			level = this._levels[zoom] = {};
+
+			level.el = DomUtil.create('div', 'leaflet-tile-container leaflet-zoom-animated', this._container);
+			level.el.style.zIndex = maxZoom;
+
+			level.origin = map.project(map.unproject(map.getPixelOrigin()), zoom).round();
+			level.zoom = zoom;
+
+			this._setZoomTransform(level, map.getCenter(), map.getZoom());
+
+			// force the browser to consider the newly added element for transition
+			Util.falseFn(level.el.offsetWidth);
+
+			this._onCreateLevel(level);
+		}
+
+		this._level = level;
+
+		return level;
+	},
+
+	_onUpdateLevel: Util.falseFn,
+
+	_onRemoveLevel: Util.falseFn,
+
+	_onCreateLevel: Util.falseFn,
+
+	_pruneTiles: function () {
+		if (!this._map) {
+			return;
+		}
+
+		var key, tile;
+
+		var zoom = this._map.getZoom();
+		if (zoom > this.options.maxZoom ||
+			zoom < this.options.minZoom) {
+			this._removeAllTiles();
+			return;
+		}
+
+		for (key in this._tiles) {
+			tile = this._tiles[key];
+			tile.retain = tile.current;
+		}
+
+		for (key in this._tiles) {
+			tile = this._tiles[key];
+			if (tile.current && !tile.active) {
+				var coords = tile.coords;
+				if (!this._retainParent(coords.x, coords.y, coords.z, coords.z - 5)) {
+					this._retainChildren(coords.x, coords.y, coords.z, coords.z + 2);
+				}
+			}
+		}
+
+		for (key in this._tiles) {
+			if (!this._tiles[key].retain) {
+				this._removeTile(key);
+			}
+		}
+	},
+
+	_removeTilesAtZoom: function (zoom) {
+		for (var key in this._tiles) {
+			if (this._tiles[key].coords.z !== zoom) {
+				continue;
+			}
+			this._removeTile(key);
+		}
+	},
+
+	_removeAllTiles: function () {
+		for (var key in this._tiles) {
+			this._removeTile(key);
+		}
+	},
+
+	_invalidateAll: function () {
+		for (var z in this._levels) {
+			DomUtil.remove(this._levels[z].el);
+			this._onRemoveLevel(z);
+			delete this._levels[z];
+		}
+		this._removeAllTiles();
+
+		this._tileZoom = undefined;
+	},
+
+	_retainParent: function (x, y, z, minZoom) {
+		var x2 = Math.floor(x / 2),
+		    y2 = Math.floor(y / 2),
+		    z2 = z - 1,
+		    coords2 = new Point(+x2, +y2);
+		coords2.z = +z2;
+
+		var key = this._tileCoordsToKey(coords2),
+		    tile = this._tiles[key];
+
+		if (tile && tile.active) {
+			tile.retain = true;
+			return true;
+
+		} else if (tile && tile.loaded) {
+			tile.retain = true;
+		}
+
+		if (z2 > minZoom) {
+			return this._retainParent(x2, y2, z2, minZoom);
+		}
+
+		return false;
+	},
+
+	_retainChildren: function (x, y, z, maxZoom) {
+
+		for (var i = 2 * x; i < 2 * x + 2; i++) {
+			for (var j = 2 * y; j < 2 * y + 2; j++) {
+
+				var coords = new Point(i, j);
+				coords.z = z + 1;
+
+				var key = this._tileCoordsToKey(coords),
+				    tile = this._tiles[key];
+
+				if (tile && tile.active) {
+					tile.retain = true;
+					continue;
+
+				} else if (tile && tile.loaded) {
+					tile.retain = true;
+				}
+
+				if (z + 1 < maxZoom) {
+					this._retainChildren(i, j, z + 1, maxZoom);
+				}
+			}
+		}
+	},
+
+	_resetView: function (e) {
+		var animating = e && (e.pinch || e.flyTo);
+		this._setView(this._map.getCenter(), this._map.getZoom(), animating, animating);
+	},
+
+	_animateZoom: function (e) {
+		this._setView(e.center, e.zoom, true, e.noUpdate);
+	},
+
+	_clampZoom: function (zoom) {
+		var options = this.options;
+
+		if (undefined !== options.minNativeZoom && zoom < options.minNativeZoom) {
+			return options.minNativeZoom;
+		}
+
+		if (undefined !== options.maxNativeZoom && options.maxNativeZoom < zoom) {
+			return options.maxNativeZoom;
+		}
+
+		return zoom;
+	},
+
+	_setView: function (center, zoom, noPrune, noUpdate) {
+		var tileZoom = this._clampZoom(Math.round(zoom));
+		if ((this.options.maxZoom !== undefined && tileZoom > this.options.maxZoom) ||
+		    (this.options.minZoom !== undefined && tileZoom < this.options.minZoom)) {
+			tileZoom = undefined;
+		}
+
+		var tileZoomChanged = this.options.updateWhenZooming && (tileZoom !== this._tileZoom);
+
+		if (!noUpdate || tileZoomChanged) {
+
+			this._tileZoom = tileZoom;
+
+			if (this._abortLoading) {
+				this._abortLoading();
+			}
+
+			this._updateLevels();
+			this._resetGrid();
+
+			if (tileZoom !== undefined) {
+				this._update(center);
+			}
+
+			if (!noPrune) {
+				this._pruneTiles();
+			}
+
+			// Flag to prevent _updateOpacity from pruning tiles during
+			// a zoom anim or a pinch gesture
+			this._noPrune = !!noPrune;
+		}
+
+		this._setZoomTransforms(center, zoom);
+	},
+
+	_setZoomTransforms: function (center, zoom) {
+		for (var i in this._levels) {
+			this._setZoomTransform(this._levels[i], center, zoom);
+		}
+	},
+
+	_setZoomTransform: function (level, center, zoom) {
+		var scale = this._map.getZoomScale(zoom, level.zoom),
+		    translate = level.origin.multiplyBy(scale)
+		        .subtract(this._map._getNewPixelOrigin(center, zoom)).round();
+
+		if (Browser.any3d) {
+			DomUtil.setTransform(level.el, translate, scale);
+		} else {
+			DomUtil.setPosition(level.el, translate);
+		}
+	},
+
+	_resetGrid: function () {
+		var map = this._map,
+		    crs = map.options.crs,
+		    tileSize = this._tileSize = this.getTileSize(),
+		    tileZoom = this._tileZoom;
+
+		var bounds = this._map.getPixelWorldBounds(this._tileZoom);
+		if (bounds) {
+			this._globalTileRange = this._pxBoundsToTileRange(bounds);
+		}
+
+		this._wrapX = crs.wrapLng && !this.options.noWrap && [
+			Math.floor(map.project([0, crs.wrapLng[0]], tileZoom).x / tileSize.x),
+			Math.ceil(map.project([0, crs.wrapLng[1]], tileZoom).x / tileSize.y)
+		];
+		this._wrapY = crs.wrapLat && !this.options.noWrap && [
+			Math.floor(map.project([crs.wrapLat[0], 0], tileZoom).y / tileSize.x),
+			Math.ceil(map.project([crs.wrapLat[1], 0], tileZoom).y / tileSize.y)
+		];
+	},
+
+	_onMoveEnd: function () {
+		if (!this._map || this._map._animatingZoom) { return; }
+
+		this._update();
+	},
+
+	_getTiledPixelBounds: function (center) {
+		var map = this._map,
+		    mapZoom = map._animatingZoom ? Math.max(map._animateToZoom, map.getZoom()) : map.getZoom(),
+		    scale = map.getZoomScale(mapZoom, this._tileZoom),
+		    pixelCenter = map.project(center, this._tileZoom).floor(),
+		    halfSize = map.getSize().divideBy(scale * 2);
+
+		return new Bounds(pixelCenter.subtract(halfSize), pixelCenter.add(halfSize));
+	},
+
+	// Private method to load tiles in the grid's active zoom level according to map bounds
+	_update: function (center) {
+		var map = this._map;
+		if (!map) { return; }
+		var zoom = this._clampZoom(map.getZoom());
+
+		if (center === undefined) { center = map.getCenter(); }
+		if (this._tileZoom === undefined) { return; }	// if out of minzoom/maxzoom
+
+		var pixelBounds = this._getTiledPixelBounds(center),
+		    tileRange = this._pxBoundsToTileRange(pixelBounds),
+		    tileCenter = tileRange.getCenter(),
+		    queue = [],
+		    margin = this.options.keepBuffer,
+		    noPruneRange = new Bounds(tileRange.getBottomLeft().subtract([margin, -margin]),
+		                              tileRange.getTopRight().add([margin, -margin]));
+
+		// Sanity check: panic if the tile range contains Infinity somewhere.
+		if (!(isFinite(tileRange.min.x) &&
+		      isFinite(tileRange.min.y) &&
+		      isFinite(tileRange.max.x) &&
+		      isFinite(tileRange.max.y))) { throw new Error('Attempted to load an infinite number of tiles'); }
+
+		for (var key in this._tiles) {
+			var c = this._tiles[key].coords;
+			if (c.z !== this._tileZoom || !noPruneRange.contains(new Point(c.x, c.y))) {
+				this._tiles[key].current = false;
+			}
+		}
+
+		// _update just loads more tiles. If the tile zoom level differs too much
+		// from the map's, let _setView reset levels and prune old tiles.
+		if (Math.abs(zoom - this._tileZoom) > 1) { this._setView(center, zoom); return; }
+
+		// create a queue of coordinates to load tiles from
+		for (var j = tileRange.min.y; j <= tileRange.max.y; j++) {
+			for (var i = tileRange.min.x; i <= tileRange.max.x; i++) {
+				var coords = new Point(i, j);
+				coords.z = this._tileZoom;
+
+				if (!this._isValidTile(coords)) { continue; }
+
+				var tile = this._tiles[this._tileCoordsToKey(coords)];
+				if (tile) {
+					tile.current = true;
+				} else {
+					queue.push(coords);
+				}
+			}
+		}
+
+		// sort tile queue to load tiles in order of their distance to center
+		queue.sort(function (a, b) {
+			return a.distanceTo(tileCenter) - b.distanceTo(tileCenter);
+		});
+
+		if (queue.length !== 0) {
+			// if it's the first batch of tiles to load
+			if (!this._loading) {
+				this._loading = true;
+				// @event loading: Event
+				// Fired when the grid layer starts loading tiles.
+				this.fire('loading');
+			}
+
+			// create DOM fragment to append tiles in one batch
+			var fragment = document.createDocumentFragment();
+
+			for (i = 0; i < queue.length; i++) {
+				this._addTile(queue[i], fragment);
+			}
+
+			this._level.el.appendChild(fragment);
+		}
+	},
+
+	_isValidTile: function (coords) {
+		var crs = this._map.options.crs;
+
+		if (!crs.infinite) {
+			// don't load tile if it's out of bounds and not wrapped
+			var bounds = this._globalTileRange;
+			if ((!crs.wrapLng && (coords.x < bounds.min.x || coords.x > bounds.max.x)) ||
+			    (!crs.wrapLat && (coords.y < bounds.min.y || coords.y > bounds.max.y))) { return false; }
+		}
+
+		if (!this.options.bounds) { return true; }
+
+		// don't load tile if it doesn't intersect the bounds in options
+		var tileBounds = this._tileCoordsToBounds(coords);
+		return latLngBounds(this.options.bounds).overlaps(tileBounds);
+	},
+
+	_keyToBounds: function (key) {
+		return this._tileCoordsToBounds(this._keyToTileCoords(key));
+	},
+
+	_tileCoordsToNwSe: function (coords) {
+		var map = this._map,
+		    tileSize = this.getTileSize(),
+		    nwPoint = coords.scaleBy(tileSize),
+		    sePoint = nwPoint.add(tileSize),
+		    nw = map.unproject(nwPoint, coords.z),
+		    se = map.unproject(sePoint, coords.z);
+		return [nw, se];
+	},
+
+	// converts tile coordinates to its geographical bounds
+	_tileCoordsToBounds: function (coords) {
+		var bp = this._tileCoordsToNwSe(coords),
+		    bounds = new LatLngBounds(bp[0], bp[1]);
+
+		if (!this.options.noWrap) {
+			bounds = this._map.wrapLatLngBounds(bounds);
+		}
+		return bounds;
+	},
+	// converts tile coordinates to key for the tile cache
+	_tileCoordsToKey: function (coords) {
+		return coords.x + ':' + coords.y + ':' + coords.z;
+	},
+
+	// converts tile cache key to coordinates
+	_keyToTileCoords: function (key) {
+		var k = key.split(':'),
+		    coords = new Point(+k[0], +k[1]);
+		coords.z = +k[2];
+		return coords;
+	},
+
+	_removeTile: function (key) {
+		var tile = this._tiles[key];
+		if (!tile) { return; }
+
+		// Cancels any pending http requests associated with the tile
+		// unless we're on Android's stock browser,
+		// see https://github.com/Leaflet/Leaflet/issues/137
+		if (!Browser.androidStock) {
+			tile.el.setAttribute('src', Util.emptyImageUrl);
+		}
+		DomUtil.remove(tile.el);
+
+		delete this._tiles[key];
+
+		// @event tileunload: TileEvent
+		// Fired when a tile is removed (e.g. when a tile goes off the screen).
+		this.fire('tileunload', {
+			tile: tile.el,
+			coords: this._keyToTileCoords(key)
+		});
+	},
+
+	_initTile: function (tile) {
+		DomUtil.addClass(tile, 'leaflet-tile');
+
+		var tileSize = this.getTileSize();
+		tile.style.width = tileSize.x + 'px';
+		tile.style.height = tileSize.y + 'px';
+
+		tile.onselectstart = Util.falseFn;
+		tile.onmousemove = Util.falseFn;
+
+		// update opacity on tiles in IE7-8 because of filter inheritance problems
+		if (Browser.ielt9 && this.options.opacity < 1) {
+			DomUtil.setOpacity(tile, this.options.opacity);
+		}
+
+		// without this hack, tiles disappear after zoom on Chrome for Android
+		// https://github.com/Leaflet/Leaflet/issues/2078
+		if (Browser.android && !Browser.android23) {
+			tile.style.WebkitBackfaceVisibility = 'hidden';
+		}
+	},
+
+	_addTile: function (coords, container) {
+		var tilePos = this._getTilePos(coords),
+		    key = this._tileCoordsToKey(coords);
+
+		var tile = this.createTile(this._wrapCoords(coords), Util.bind(this._tileReady, this, coords));
+
+		this._initTile(tile);
+
+		// if createTile is defined with a second argument ("done" callback),
+		// we know that tile is async and will be ready later; otherwise
+		if (this.createTile.length < 2) {
+			// mark tile as ready, but delay one frame for opacity animation to happen
+			Util.requestAnimFrame(Util.bind(this._tileReady, this, coords, null, tile));
+		}
+
+		DomUtil.setPosition(tile, tilePos);
+
+		// save tile in cache
+		this._tiles[key] = {
+			el: tile,
+			coords: coords,
+			current: true
+		};
+
+		container.appendChild(tile);
+		// @event tileloadstart: TileEvent
+		// Fired when a tile is requested and starts loading.
+		this.fire('tileloadstart', {
+			tile: tile,
+			coords: coords
+		});
+	},
+
+	_tileReady: function (coords, err, tile) {
+		if (!this._map) { return; }
+
+		if (err) {
+			// @event tileerror: TileErrorEvent
+			// Fired when there is an error loading a tile.
+			this.fire('tileerror', {
+				error: err,
+				tile: tile,
+				coords: coords
+			});
+		}
+
+		var key = this._tileCoordsToKey(coords);
+
+		tile = this._tiles[key];
+		if (!tile) { return; }
+
+		tile.loaded = +new Date();
+		if (this._map._fadeAnimated) {
+			DomUtil.setOpacity(tile.el, 0);
+			Util.cancelAnimFrame(this._fadeFrame);
+			this._fadeFrame = Util.requestAnimFrame(this._updateOpacity, this);
+		} else {
+			tile.active = true;
+			this._pruneTiles();
+		}
+
+		if (!err) {
+			DomUtil.addClass(tile.el, 'leaflet-tile-loaded');
+
+			// @event tileload: TileEvent
+			// Fired when a tile loads.
+			this.fire('tileload', {
+				tile: tile.el,
+				coords: coords
+			});
+		}
+
+		if (this._noTilesToLoad()) {
+			this._loading = false;
+			// @event load: Event
+			// Fired when the grid layer loaded all visible tiles.
+			this.fire('load');
+
+			if (Browser.ielt9 || !this._map._fadeAnimated) {
+				Util.requestAnimFrame(this._pruneTiles, this);
+			} else {
+				// Wait a bit more than 0.2 secs (the duration of the tile fade-in)
+				// to trigger a pruning.
+				setTimeout(Util.bind(this._pruneTiles, this), 250);
+			}
+		}
+	},
+
+	_getTilePos: function (coords) {
+		return coords.scaleBy(this.getTileSize()).subtract(this._level.origin);
+	},
+
+	_wrapCoords: function (coords) {
+		var newCoords = new Point(
+			this._wrapX ? Util.wrapNum(coords.x, this._wrapX) : coords.x,
+			this._wrapY ? Util.wrapNum(coords.y, this._wrapY) : coords.y);
+		newCoords.z = coords.z;
+		return newCoords;
+	},
+
+	_pxBoundsToTileRange: function (bounds) {
+		var tileSize = this.getTileSize();
+		return new Bounds(
+			bounds.min.unscaleBy(tileSize).floor(),
+			bounds.max.unscaleBy(tileSize).ceil().subtract([1, 1]));
+	},
+
+	_noTilesToLoad: function () {
+		for (var key in this._tiles) {
+			if (!this._tiles[key].loaded) { return false; }
+		}
+		return true;
+	}
+});
+
+// @factory L.gridLayer(options?: GridLayer options)
+// Creates a new instance of GridLayer with the supplied options.
+export function gridLayer(options) {
+	return new GridLayer(options);
+}