From 0b1f61b8ceb901f1ad4e26080475a0cf84ea7de9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=AD=90=E9=BE=99=E5=B1=B1=E4=BA=BA?=
 <guanghui8827@126.com>
Date: Mon, 29 Aug 2016 02:23:01 -0500
Subject: [PATCH] fix possible crash of label shrinked (#16456)

---
 cocos/platform/mac/CCDevice-mac.mm | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/cocos/platform/mac/CCDevice-mac.mm b/cocos/platform/mac/CCDevice-mac.mm
index ae84e4ca36..a23f91c52d 100644
--- a/cocos/platform/mac/CCDevice-mac.mm
+++ b/cocos/platform/mac/CCDevice-mac.mm
@@ -129,6 +129,10 @@ static NSSize _calculateRealSizeForString(NSAttributedString **str, id font, NSS
         while (actualSize.size.width > constrainSize.width ||
                actualSize.size.height > constrainSize.height) {
             fontSize = fontSize - 1;
+            if (fontSize < 0) {
+                actualSize = CGRectMake(0, 0, 0, 0);
+                break;
+            }
             
             NSMutableAttributedString *mutableString = [[*str mutableCopy] autorelease];
             *str = __attributedStringWithFontSize(mutableString, fontSize);
@@ -162,6 +166,10 @@ static NSSize _calculateRealSizeForString(NSAttributedString **str, id font, NSS
         while (actualSize.size.height > constrainSize.height
                ||actualSize.size.width > constrainSize.width) {
             fontSize = fontSize - 1;
+            if (fontSize < 0) {
+                actualSize = CGRectMake(0, 0, 0, 0);
+                break;
+            }
             
             NSMutableAttributedString *mutableString = [[*str mutableCopy] autorelease];
             *str = __attributedStringWithFontSize(mutableString, fontSize);