Added support for keeping a limited set of tile textures.

lib/pixi/deepzoom/loader.js

@@ -1,4 +1,4 @@
-import { deepZoomTileCache, Tile } from './tile.js'
+import Tile from './tile.js'
 
 /**
  * A Tile Loader component that can be plugged into a Tiles Layer.
@@ -28,6 +28,8 @@ export class TileLoader {
     schedule(url, col, row) {
         if (this.loaded.has(url)) return false
         if (this.loading.has(url)) return false
+
+        Tile.schedule(url)
         this.map.set(url, [col, row])
         this.loading.add(url)
         this.loadQueue.push(url)
@@ -37,6 +39,7 @@ export class TileLoader {
     unschedule(url) {
         if (this.loaded.has(url)) this.loaded.delete(url)
         if (this.loading.has(url)) this.loading.delete(url)
+        Tile.unschedule(url)
         this.loadQueue = this.loadQueue.filter(item => item != url)
     }
 
@@ -96,16 +99,13 @@ export class PIXITileLoader extends TileLoader {
         if (this.loaded.has(url)) return false
         if (this.loading.has(url)) return false
 
-        if (deepZoomTileCache.has(url)) {
-            let tiles = deepZoomTileCache.get(url)
-            for (let tile of tiles.values()) {
-                //console.log("Reusing cached texture", tile.parent)
-                let texture = tile.texture
-                this._textureAvailable(url, col, row, texture)
-                return false
-            }
+        Tile.schedule(url)
+        let reusableTexture = Tile.textureAvailable(url)
+        if (reusableTexture) {
+            if (this.debug) console.log('Texture reusable', reusableTexture)
+            this._textureAvailable(url, col, row, reusableTexture)
+            return false
         }
-        
         let texture = PIXI.utils.TextureCache[url]
         if (texture) {
             if (this.debug) console.log('Texture already loaded', texture)