iwmlib/lib/pixi/deepzoom/tile.js

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/* ES Lint */
/* globals PIXI, console*/
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const registeredTiles = new Map()
/** Implements a baseTexture cache. The last textures are kept for reuse */
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let keepTextures = 0
const keptTextures = []
const lateTextures = new Map()
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let lastSweepTime = 0
let sweepInterval = 2000.0
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/** The current Tile implementation simply uses PIXI.Sprites.
*
* BTW: PIXI.extras.TilingSprite is not appropriate. It should be used for
* repeating patterns.
**/
export default class Tile extends PIXI.Sprite {
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constructor(texture, url) {
super(texture)
this.url = url
this.register(url)
}
/**
* Static method to enable keeping of base textures
*
* @static
* @param {*} value
* @memberof Tile
*/
static enableKeepTextures(value = 1000) {
keepTextures = value
}
/**
* Returns true iff the url is pending
*
* @static
* @param {*} url
* @returns
* @memberof Tile
*/
/*static isPending(url) {
return pendingTiles.has(url) && pendingTiles.get(url) > 0
} */
static isObsolete(url) {
if (registeredTiles.has(url) && registeredTiles.get(url) > 0) {
return false
}
return true
}
/**
* Loads a tile from image using the PIXI.Texture.fromImage method.
*
* @static
* @param {*} imageId
* @param {*} crossorigin
* @param {*} scaleMode
* @returns
* @memberof Tile
*/
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static fromImage(imageId, crossorigin, scaleMode) {
return new Tile(PIXI.Texture.fromImage(imageId, crossorigin, scaleMode), imageId)
}
/**
* Registers the tile in the global reference counter for textures
*
* @param {*} url
* @param {boolean} [debug=false]
* @memberof Tile
*/
register(url, debug = false) {
//Tile.unschedule(url)
if (registeredTiles.has(url)) {
let tiles = registeredTiles.get(url)
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tiles.add(this)
if (debug) console.log("Tile.register", url, tiles.size)
}
else {
registeredTiles.set(url, new Set([this]))
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if (debug) console.log("Tile.register", url, 1)
}
}
/**
* Unregisters the rile in the global reference counter for textures
*
* @returns {number} The number of how often a texture is used.
* @memberof Tile
*/
unregister() {
let tiles = registeredTiles.get(this.url)
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tiles.delete(this)
if (tiles.size == 0) {
registeredTiles.delete(this.url)
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return 0
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}
return tiles.size
}
/**
* Destroys this sprite and optionally its texture and children
*
* @param {*} options Part of the PIXI API, but ignored in the implementation
* @memberof Tile
*/
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destroy(options, debug = false) {
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let count = this.unregister()
if (keepTextures > 0) {
keptTextures.push({ url: this.url, texture: this.texture })
let opts = { children: true, texture: false, baseTexture: false }
if (debug) console.log("Tile.destroy", registeredTiles.size, opts)
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super.destroy(opts)
while (keptTextures.length > keepTextures) {
let { url, texture } = keptTextures.shift()
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if (Tile.isObsolete(url)) {
texture.destroy(true) // Destroy base as well
if (debug) console.log("Destroying texture and baseTexture", url)
}
}
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}
else {
// No longer registered and not pending
if (count <= 0) { // && !Tile.isPending(this.url)
let opts = { children: true, texture: true, baseTexture: true }
super.destroy(opts)
if (debug) console.log("Tile.destroy", registeredTiles.size, opts)
}
else {
let opts = { children: true, texture: false, baseTexture: false }
if (debug) console.log("Tile.destroy", registeredTiles.size, opts)
super.destroy(opts)
}
if (this.parent != null) {
// UO: Emit warning and remove
console.warn("Destroying tile with parent. Hiding instead")
this.visible = false
}
}
}
/**
* Returns an available texture that can be reused
*
* @param {*} url
* @returns
* @memberof Tile
*/
static textureAvailable(url) {
if (registeredTiles.has(url)) {
let tiles = registeredTiles.get(url)
for (let tile of tiles.values()) {
//console.log("Reusing cached texture", tile.parent)
return tile.texture
}
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}
return null
}
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/**
* Specialized renderWebGL to avoid freezing system
*
* @param {*} renderer
* @memberof Tile
*/
renderWebGL(renderer) {
try {
super.renderWebGL(renderer)
}
catch (e) {
// We want persistent logging here
Logging.error("Error in Tile.renderWebGL: " + e.message)
}
}
/**
* Removes lately arrived texture if they have not been touched in the meanwhile.
*
* @static
* @memberof Tile
*/
static sweepLateTextures() {
let now = performance.now()
if (now > lastSweepTime + sweepInterval) {
lastSweepTime = now
let count = 0
for (let [url, texture] of lateTextures.entries()) {
if (texture) {
let base = texture.baseTexture
if (base != null && base.touched == 0) {
texture.destroy(true)
//console.info("Sweeping ", url)
count += 1
lateTextures.delete(url)
}
}
}
if (count > 0)
console.log("Sweeping textures", count)
}
}
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/**
* Texture received too late. We do not need it.
* @param {*} url
* @param {*} texture
*/
static lateTexture(url, texture) {
lateTextures.set(url, texture)
//console.warn("Tile.lateTexture")
// We cannot destroy the texture since we got errors in t.renderWebGL.
// Perhaps we can destroy unsed textures later on
Tile.sweepLateTextures()
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}
static printInfos() {
let references = new Map()
let multiples = 0
for (let [url, tiles] of registeredTiles.entries()) {
let count = tiles.size
references.set(url, count)
if (count > 1) {
multiples += 1
}
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}
console.log({ multiples, references })
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}
}