From e9c4e8cf3b01e6eb51b56ad0313db2a195d962dd Mon Sep 17 00:00:00 2001
From: sapics <gv.nishino@gmail.com>
Date: Fri, 21 Sep 2018 16:07:44 +0900
Subject: [PATCH] Release memory on Color

---
 src/item/Item.js   |  2 ++
 src/style/Style.js | 14 +++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/item/Item.js b/src/item/Item.js
index 6b8183f2..2b762f63 100644
--- a/src/item/Item.js
+++ b/src/item/Item.js
@@ -2662,6 +2662,8 @@ new function() { // Injection scope for hit-test functions shared with project
         var owner = this._getOwner(),
             project = this._project,
             index = this._index;
+        if (this._style)
+            this._style._dispose();
         if (owner) {
             // Handle named children separately from index:
             if (this._name)
diff --git a/src/style/Style.js b/src/style/Style.js
index 1b2dccb2..f8e10280 100644
--- a/src/style/Style.js
+++ b/src/style/Style.js
@@ -174,8 +174,10 @@ var Style = Base.extend(new function() {
                     if (isColor) {
                         // The old value may be a native string or other color
                         // description that wasn't coerced to a color object yet
-                        if (old && old._owner !== undefined)
+                        if (old && old._owner !== undefined) {
                             old._owner = undefined;
+                            old._canvasStyle = null;
+                        }
                         if (value && value.constructor === Color) {
                             // Clone color if it already has an owner.
                             // NOTE: If value is not a Color, it is only
@@ -305,6 +307,16 @@ var Style = Base.extend(new function() {
                 || false;
     },
 
+    _dispose: function() {
+        var color;
+        color = this.getFillColor();
+        if (color) color._canvasStyle = null;
+        color = this.getStrokeColor();
+        if (color) color._canvasStyle = null;
+        color = this.getShadowColor();
+        if (color) color._canvasStyle = null;
+    },
+
     // DOCS: Style#hasFill()
     hasFill: function() {
         var color = this.getFillColor();