diff --git a/src/imagetilesource.js b/src/imagetilesource.js
index 375c65d6..da1c201b 100644
--- a/src/imagetilesource.js
+++ b/src/imagetilesource.js
@@ -195,6 +195,13 @@
}
return context;
},
+ /**
+ * Destroys ImageTileSource
+ * @function
+ */
+ destroy: function () {
+ this._freeupCanvasMemory();
+ },
// private
//
@@ -258,7 +265,19 @@
bigContext = smallContext;
}
return levels;
- }
+ },
+ /**
+ * Free up canvas memory
+ * (iOS 12 or higher on 2GB RAM device has only 224MB canvas memory,
+ * and Safari keeps canvas until its height and width will be set to 0).
+ * @function
+ */
+ _freeupCanvasMemory: function () {
+ for (var i = 0; i < this.levels.length; i++) {
+ this.levels[i].context2D.canvas.height = 0;
+ this.levels[i].context2D.canvas.width = 0;
+ }
+ },
});
}(OpenSeadragon));
diff --git a/src/tiledimage.js b/src/tiledimage.js
index 347a5b3e..cc05cb57 100644
--- a/src/tiledimage.js
+++ b/src/tiledimage.js
@@ -326,6 +326,10 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
*/
destroy: function() {
this.reset();
+
+ if (this.source.destroy) {
+ this.source.destroy();
+ }
},
/**
diff --git a/test/demo/memorycheck-with-simple-image.html b/test/demo/memorycheck-with-simple-image.html
new file mode 100644
index 00000000..292c6994
--- /dev/null
+++ b/test/demo/memorycheck-with-simple-image.html
@@ -0,0 +1,55 @@
+
+
+
+ OpenSeadragon Memory Check With Simple Image Demo
+
+
+
+
+
+ Simple demo page to monitor OpenSeadragon Memory Usage.
+
+
+
+
+
+
+
+
+