78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
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export const deepZoomTileCache = new Map()
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/** The current Tile implementation simply uses PIXI.Sprites.
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*
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* BTW: PIXI.extras.TilingSprite is not appropriate. It should be used for
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* repeating patterns.
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**/
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export class Tile extends PIXI.Sprite {
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constructor(texture, url) {
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super(texture)
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this.url = url
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this.register(url)
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}
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static fromImage(imageId, crossorigin, scaleMode) {
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return new Tile(PIXI.Texture.fromImage(imageId, crossorigin, scaleMode), imageId)
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}
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/**
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* Registers the tile in the global reference counter for textures
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*
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* @param {*} url
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* @param {boolean} [debug=false]
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* @memberof Tile
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*/
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register(url, debug = false) {
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if (deepZoomTileCache.has(url)) {
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let tiles = deepZoomTileCache.get(url)
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tiles.add(this)
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if (debug) console.log("Tile.register", url, tiles.size)
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}
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else {
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deepZoomTileCache.set(url, new Set([this]))
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if (debug) console.log("Tile.register", url, 1)
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}
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}
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/**
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* Unregisters the rile in the global reference counter for textures
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*
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* @returns {number} The number of how often a texture is used.
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* @memberof Tile
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*/
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unregister() {
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let tiles = deepZoomTileCache.get(this.url)
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tiles.delete(this)
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if (tiles.size == 0) {
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deepZoomTileCache.delete(this.url)
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}
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return tiles.size
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}
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/**
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* Destroys this sprite and optionally its texture and children
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*
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* @param {*} options Part of the PIXI API, but ignored in the implementation
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* @memberof Tile
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*/
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destroy(options, debug = false) {
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if (this.parent != null) {
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}
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let count = this.unregister()
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if (count <= 0) {
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let opts = { children: true, texture: true, baseTexture: true }
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super.destroy(opts)
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if (debug) console.log("Tile.destroy", deepZoomTileCache.size, opts)
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}
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else {
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let opts = { children: true, texture: false, baseTexture: false }
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if (debug) console.log("Tile.destroy", deepZoomTileCache.size, opts)
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super.destroy(opts)
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}
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}
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}
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