From d231a44d9a2ababbb3bb68aa387e44c5ec827cb9 Mon Sep 17 00:00:00 2001
From: Michael Gibson <michael.gibson@techcyte.com>
Date: Mon, 10 Feb 2025 08:51:51 -0700
Subject: [PATCH] top down

---
 src/tiledimage.js | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/src/tiledimage.js b/src/tiledimage.js
index 5b7ea362..18987863 100644
--- a/src/tiledimage.js
+++ b/src/tiledimage.js
@@ -1362,7 +1362,8 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
         // lower-resolution levels are skipped
         let useLevel = false;
         let unloaded = [];
-        let extraUnloaded = [];
+        // let extraUnloaded = [];
+        let baseLevel = null;
         for (let i = 0; i < levelList.length; i++) {
             let level = levelList[i];
 
@@ -1379,6 +1380,10 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
                 continue;
             }
 
+            if (baseLevel === null) {
+                baseLevel = level;
+            }
+
             var targetRenderPixelRatio = this.viewport.deltaPixelsFromPointsNoRotate(
                 this.source.getPixelRatio(level),
                 false
@@ -1411,11 +1416,9 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
             );
 
             bestTiles = result.bestTiles;
-            if (unloaded.length === 0) {
-                unloaded = result.unloadedTiles;
-            }
-            if (extraUnloaded.length === 0) {
-                extraUnloaded = result.extraTiles;
+            unloaded = result.unloadedTiles.concat(unloaded);
+            if (baseLevel === level + 1) {
+                // extraUnloaded = result.extraTiles;
             }
             var tiles = result.updatedTiles.filter(tile => tile.loaded);
             var makeTileInfoObject = (function(level, levelOpacity, currentTime){
@@ -1438,15 +1441,15 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
             }
         }
 
-        unloaded.slice(0, 20).forEach(tile => {
+        unloaded.slice(0, 50).forEach(tile => {
             this._loadTile(tile, currentTime);
         });
 
-        if (extraUnloaded.length && this._tilesLoading === 0 && !unloaded.length) {
-            extraUnloaded.slice(0, 10).forEach(tile => {
-                this._loadTile(tile, currentTime);
-            });
-        }
+        // if (extraUnloaded.length && this._tilesLoading === 0 && !unloaded.length) {
+        //     extraUnloaded.slice(0, 20).forEach(tile => {
+        //         this._loadTile(tile, currentTime);
+        //     });
+        // }
 
 
         // Load the new 'best' n tiles