From e9c5d232d586af8f120e6c8f5ca12b34c247fd21 Mon Sep 17 00:00:00 2001
From: 2SC1815J <2SC1815J@users.noreply.github.com>
Date: Tue, 16 Jul 2019 16:55:08 +0900
Subject: [PATCH 1/2] fix negative value of _this.maxNativeZoom

---
 leaflet-iiif.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/leaflet-iiif.js b/leaflet-iiif.js
index 4185653..b1b518f 100644
--- a/leaflet-iiif.js
+++ b/leaflet-iiif.js
@@ -201,8 +201,11 @@ L.TileLayer.Iiif = L.TileLayer.extend({
         };
 
         // Calculates maximum native zoom for the layer
-        _this.maxNativeZoom = Math.max(ceilLog2(_this.x / _this.options.tileSize),
-          ceilLog2(_this.y / _this.options.tileSize));
+        _this.maxNativeZoom = Math.max(
+          ceilLog2(_this.x / _this.options.tileSize),
+          ceilLog2(_this.y / _this.options.tileSize),
+          0
+        );
         _this.options.maxNativeZoom = _this.maxNativeZoom;
         
         // Enable zooming further than native if maxZoom option supplied

From feca6d0c8351d7d74a9ca54063155fce4c87cbbe Mon Sep 17 00:00:00 2001
From: 2SC1815J <2SC1815J@users.noreply.github.com>
Date: Tue, 16 Jul 2019 17:00:00 +0900
Subject: [PATCH 2/2] Workaround for use with Leaflet 0.7.7

---
 leaflet-iiif.js | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/leaflet-iiif.js b/leaflet-iiif.js
index b1b518f..973b442 100644
--- a/leaflet-iiif.js
+++ b/leaflet-iiif.js
@@ -72,6 +72,9 @@ L.TileLayer.Iiif = L.TileLayer.extend({
       // Set maxZoom for map
       map._layersMaxZoom = _this.maxZoom;
 
+      // Call add TileLayer
+      L.TileLayer.prototype.onAdd.call(_this, map);
+
       // Set minZoom and minNativeZoom based on how the imageSizes match up
       var smallestImage = _this._imageSizes[0];
       var mapSize = _this._map.getSize();
@@ -91,9 +94,6 @@ L.TileLayer.Iiif = L.TileLayer.extend({
       _this._prev_map_layersMinZoom = _this._map._layersMinZoom;
       _this._map._layersMinZoom = newMinZoom;
 
-      // Call add TileLayer
-      L.TileLayer.prototype.onAdd.call(_this, map);
-
       if (_this.options.fitBounds) {
         _this._fitBounds();
       }
@@ -266,7 +266,6 @@ L.TileLayer.Iiif = L.TileLayer.extend({
     return this._infoToBaseUrl() + '{region}/{size}/{rotation}/{quality}.{format}';
   },
   _isValidTile: function(coords) {
-    var tileBounds = this._tileCoordsToBounds(coords);
     var _this = this;
     var zoom = _this._getZoomForUrl();
     var sizes = _this._tierSizes[zoom];
@@ -283,6 +282,9 @@ L.TileLayer.Iiif = L.TileLayer.extend({
       return true;
     }
   },
+  _tileShouldBeLoaded: function(coords) {
+    return this._isValidTile(coords);
+  },
   _getInitialZoom: function (mapSize) {
     var _this = this;
     var tolerance = 0.8;