From b380db25faae576b026d2f4c5b4b026e09c36aef Mon Sep 17 00:00:00 2001
From: DCloud_LXH <283700113@qq.com>
Date: Mon, 30 Aug 2021 15:31:09 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20canvas=20=E8=A7=A6=E5=8F=91=20resize=20?=
 =?UTF-8?q?=E5=AF=BC=E8=87=B4=E5=BB=B6=E8=BF=9F=E7=BB=98=E5=9B=BE=E6=97=B6?=
 =?UTF-8?q?canvas=E5=8F=98=E5=8C=96=20fixed=20#2847?=
MIME-Version: 1.0
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---
 src/core/view/components/canvas/index.vue | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/core/view/components/canvas/index.vue b/src/core/view/components/canvas/index.vue
index 4af85af767..a40a897c2f 100644
--- a/src/core/view/components/canvas/index.vue
+++ b/src/core/view/components/canvas/index.vue
@@ -133,12 +133,13 @@ export default {
         method(data)
       }
     },
-    _resize () {
+    _resize (size) {
       var canvas = this.$refs.canvas
+      var hasChanged = !size || (canvas.width !== size.width * pixelRatio || canvas.height !== size.height * pixelRatio)
       if (canvas.width > 0 && canvas.height > 0) {
         var context = canvas.getContext('2d')
         var imageData = context.getImageData(0, 0, canvas.width, canvas.height)
-        wrapper(canvas)
+        hasChanged && wrapper(canvas)
         context.putImageData(imageData, 0, 0)
       } else {
         wrapper(canvas)
-- 
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