你好，关于您的自绘组件ImageShaderDemo

我在学习您的代码ImageShaderDemo的时候，运行在真机上之后，会显示报错，机型为小米mix2s，具体报错如下：
======== Exception caught by rendering library =====================================================
The following UnimplementedError was thrown during paint():
UnimplementedError

The relevant error-causing widget was: 
  CustomPaint CustomPaint:file:///Users/xxx/Documents/flutterProj/other/flutter-beginner/custom_paint/lib/painter/image_shader_demo.dart:55:14
When the exception was thrown, this was the stack: 
#0      Matrix4.scale (package:vector_math/src/vector_math_64/matrix4.dart:886:7)
#1      Matrix4.scaled (package:vector_math/src/vector_math_64/matrix4.dart:908:65)
#2      ImageEditor.paint (package:custom_paint/painter/image_shader_demo.dart:97:15)
#3      RenderCustomPaint._paintWithPainter (package:flutter/src/rendering/custom_paint.dart:563:13)
#4      RenderCustomPaint.paint (package:flutter/src/rendering/custom_paint.dart:605:7)
#5      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#6      PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#7      RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#8      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#9      PaintingContext.paintChild (package:flutter/src/rendering/object.dart:187:13)
#10     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:15)
#11     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:2477:7)
#12     PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:141:11)
#13     PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:100:5)
#14     PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:995:29)
#15     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:506:19)
#16     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:892:13)
#17     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:370:5)
#18     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1146:15)
#19     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1083:9)
#20     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:997:5)
#24     _invoke (dart:ui/hooks.dart:151:10)
#25     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:308:5)
#26     _drawFrame (dart:ui/hooks.dart:115:31)
(elided 3 frames from dart:async)
The following RenderObject was being processed when the exception was fired: RenderCustomPaint#f7613
...  parentData: <none> (can use size)
...  constraints: BoxConstraints(w=392.7, h=785.5)
...  size: Size(392.7, 785.5)
...  painter: ImageEditor#2738b()
RenderObject: RenderCustomPaint#f7613
  parentData: <none> (can use size)
  constraints: BoxConstraints(w=392.7, h=785.5)
  size: Size(392.7, 785.5)
  painter: ImageEditor#2738b()
====================================================================================================

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