Revert "fix: app crash because of animating gif"

com.unity.uiwidgets/Runtime/painting/image_stream.cs

                 _emitFrame(new ImageInfo(image: _nextFrame.image, scale: _scale));
                 _shownTimestamp = timestamp;
                 _frameDuration = _nextFrame.duration;
-                _nextFrame.DisposeCPtr();
                 _nextFrame = null;
                 int completedCycles = _codec.frameCount == 0 ? 0 : _framesEmitted / _codec.frameCount;
 

com.unity.uiwidgets/Runtime/rendering/image.cs

                 if (value == _image) {
                     return;
                 }
-                if(_image != null){
-                    _image.DisposeCPtr();
-                }
+
                 _image = value;
                 markNeedsPaint();
                 if (_width == null || _height == null) {

com.unity.uiwidgets/Runtime/rendering/layer.cs

             get { return (ContainerLayer) base.parent; }
         }
 
-        public virtual void DisposeCPtr()
-        {
-            if(_engineLayer != null) {
-                _engineLayer.DisposeCPtr();
-            }
-        }
-
         public bool _needsAddToScene = true;
 
         protected void markNeedsAddToScene() {
         protected EngineLayer engineLayer {
             get { return _engineLayer; }
             set {
-                if(_engineLayer != null){
-                    _engineLayer.DisposeCPtr();
-                }
                 _engineLayer = value;
                 if (!alwaysNeedsAddToScene) {
                     if (parent != null && !parent.alwaysNeedsAddToScene) {
             this.canvasBounds = canvasBounds;
         }
 
-        public override void DisposeCPtr()
-        {
-            base.DisposeCPtr();
-            if(_picture != null){
-                 _picture.DisposeCPtr();
-            }
-        }
-
         public readonly Rect canvasBounds;
 
         Picture _picture;
             return addedLayers;
         }
 
-        public override void DisposeCPtr() {
-            base.DisposeCPtr();
-            Layer child = firstChild;
-            while (child != null) {
-                Layer next = child.nextSibling;
-                child.DisposeCPtr();
-                child = next;
-            }
-        }
-
         internal override void updateSubtreeNeedsAddToScene() {
             base.updateSubtreeNeedsAddToScene();
             Layer child = firstChild;
                 child._nextSibling = null;
                 D.assert(child.attached == attached);
                 dropChild(child);
-                child.DisposeCPtr();
                 child = next;
             }
 

com.unity.uiwidgets/Runtime/rendering/view.cs

             using (var scene = layer.buildScene(builder)) {
                 Window.instance.render(scene);
             }
-            builder.DisposeCPtr();
+
             D.assert(() => {
                 if (D.debugRepaintRainbowEnabled || D.debugRepaintTextRainbowEnabled) {
                     D.debugCurrentRepaintColor =

com.unity.uiwidgets/Runtime/ui/compositing.cs

         }
     }
 
-    public class SceneBuilder : NativeWrapperCPtrDisposable {
+    public class SceneBuilder : NativeWrapper {
-        public override void DisposeCPtrImpl(IntPtr ptr) {
+        public override void DisposePtr(IntPtr ptr) {
             SceneBuilder_dispose(ptr);
         }
 

com.unity.uiwidgets/Runtime/ui/native_bindings.cs

             _dispose();
         }
     }
-
-    /// <summary>
-    /// This class is used to release c++ resources in advance without waiting for c# garbage collection. 
-    /// Please make sure that the resource will not be used again after it is released.
-    /// Releasing resources prematurely may cause null pointer exceptions in references elsewhere.
-    ///
-    /// Usage: 
-    ///    Use DisposeCPtr() to manually release c++ resources, and then add an interface to release unmanaged memory 
-    ///    in DisposeCPtrImpl(IntPtr ptr).
-    /// </summary>
-    public abstract class NativeWrapperCPtrDisposable : NativeWrapperDisposable {
-        public bool isDisposed = false;
-
-        protected NativeWrapperCPtrDisposable() {
-        }
-
-        protected NativeWrapperCPtrDisposable(IntPtr ptr) : base(ptr) {
-        }
-
-        public void DisposeCPtr() {
-            DisposePtr(_ptr);
-        }
-        public override void DisposePtr(IntPtr ptr) {
-            if(isDisposed){
-                return;
-            }
-            isDisposed = true;
-            DisposeCPtrImpl(ptr); 
-        }
-
-        public abstract void DisposeCPtrImpl(IntPtr ptr);
-    }
 }

com.unity.uiwidgets/Runtime/ui/painting.cs

         public int rowBytes;
     }
 
-    public class Image : NativeWrapperCPtrDisposable, IEquatable<Image> {
-
+    public class Image : NativeWrapperDisposable, IEquatable<Image> {
-        public override void DisposeCPtrImpl(IntPtr ptr) {
-            Image_dispose(ptr); 
+        public override void DisposePtr(IntPtr ptr) {
+            Image_dispose(ptr);
         }
 
         public int width => Image_width(_ptr);
 
     public delegate void ImageDecoderCallback(Image result);
 
-    public class FrameInfo : NativeWrapperCPtrDisposable {
-        
+    public class FrameInfo : NativeWrapper {
-        public override void DisposeCPtrImpl(IntPtr ptr) {
+        public override void DisposePtr(IntPtr ptr) {
-
-        
-        private Image _image;
-
-        public Image image {
-            get {
-                if(_image == null){
-                    _image = new Image(FrameInfo_image(_ptr));
-                }
-                
-                return _image;
-            }
-        }
+        public Image image => new Image(FrameInfo_image(_ptr));
 
         [DllImport(NativeBindings.dllName)]
         static extern void FrameInfo_dispose(IntPtr ptr);
         reverseDifference,
     }
 
-    public abstract class EngineLayer : NativeWrapperCPtrDisposable {
+    public abstract class EngineLayer : NativeWrapper {
-        public override void DisposeCPtrImpl(IntPtr ptr) {
+        public override void DisposePtr(IntPtr ptr) {
             EngineLayer_dispose(ptr);
         }
 
             bool transparentOccluder);
     }
 
-    public class Picture : NativeWrapperCPtrDisposable {
-
+    public class Picture : NativeWrapperDisposable {
-        public override void DisposeCPtrImpl(IntPtr ptr) {
+        public override void DisposePtr(IntPtr ptr) {
             Picture_dispose(ptr);
         }
 

com.unity.uiwidgets/Runtime/widgets/widget_inspector.cs

         }
 
 
-        public override void DisposeCPtr() {
-            if(_picture != null){
-                _picture.DisposeCPtr();
-            }
-        }
-
         public override bool findAnnotations<S>(
             AnnotationResult<S> result,
             Offset localPosition,