fix reference

com.unity.uiwidgets/Runtime/ui2/painting.cs

         // If you add more fields, remember to update _kDataByteCount.
         const int _kDataByteCount = 56;
 
-        public object[] _objects;
+        object[] _objects;
         internal IntPtr[] _objectPtrs;
         const int _kShaderIndex = 0;
         const int _kColorFilterIndex = 1;

com.unity.uiwidgets/Runtime/ui2/text.cs

 using Unity.UIWidgets.ui;
 using UnityEngine;
 using Unity.UIWidgets.async2;
+using Unity.UIWidgets.external.simplejson;
 using Rect = Unity.UIWidgets.ui.Rect;
 
 namespace Unity.UIWidgets.ui2 {
             }
         }
 
-        static byte[] _fontChangeMessage =
-            Encoding.ASCII.GetBytes(JsonUtility.ToJson(new Dictionary<string, dynamic>() {{"type", "fontsChange"}}));
+        static byte[] _fontChangeMessageData;
+
+        static byte[] _fontChangeMessage {
+            get {
+                if (_fontChangeMessageData != null) {
+                    return _fontChangeMessageData;
+                }
+                JSONObject message = new JSONObject();
+                message["type"] = "fontsChange";
+                _fontChangeMessageData = Encoding.ASCII.GetBytes(message.ToString());
+                return _fontChangeMessageData;
+            }
+        }
-            Window window = new Window();
-            window.onPlatformMessage?.Invoke("uiwidgets/system", _fontChangeMessage,
+            Window.instance.onPlatformMessage?.Invoke("uiwidgets/system", _fontChangeMessage,
                 (_) => { });
         }
 
             IntPtr callbackHandle,
             string fontFamily);
 
-        public struct BaseList {
+        public struct Float32List {
-        public static float[] toFloatArrayAndFree(this BaseList data) {
+        public static float[] toFloatArrayAndFree(this Float32List data) {
             float[] result = new float[data.length];
             Marshal.Copy(data.data, result, 0, data.length);
             ui_.Lists_Free(data.data);
             List<Shadow> shadows = null,
             List<FontFeature> fontFeatures = null
         ) {
-            D.assert(color == null || foreground == null
-                // "Cannot provide both a color and a foreground\n"+
-                // "The color argument is just a shorthand for \"foreground: Paint()..color = color\"."
+            D.assert(color == null || foreground == null, () =>
+                "Cannot provide both a color and a foreground\n"+
+                "The color argument is just a shorthand for \"foreground: Paint()..color = color\"."
             );
             _encoded = ui_._encodeTextStyle(
                 color,
         static extern void Paragraph_layout(IntPtr ptr, float width);
 
         [DllImport(NativeBindings.dllName)]
-        static extern ui_.BaseList Paragraph_getRectsForRange(IntPtr ptr, int start, int end,
+        static extern ui_.Float32List Paragraph_getRectsForRange(IntPtr ptr, int start, int end,
-        static extern ui_.BaseList Paragraph_getRectsForPlaceholders(IntPtr ptr);
+        static extern ui_.Float32List Paragraph_getRectsForPlaceholders(IntPtr ptr);
 
         [DllImport(NativeBindings.dllName)]
         static extern unsafe void Paragraph_getPositionForOffset(IntPtr ptr, float dx, float dy, int* encodedPtr);
         static extern void Paragraph_paint(IntPtr ptr, IntPtr canvas, float x, float y);
 
         [DllImport(NativeBindings.dllName)]
-        static extern ui_.BaseList Paragraph_computeLineMetrics(IntPtr ptr);
+        static extern ui_.Float32List Paragraph_computeLineMetrics(IntPtr ptr);
 
         [DllImport(NativeBindings.dllName)]
         static extern void Paragraph_dispose(IntPtr ptr);
         }
 
         // See paragraph.cc for the layout of this return value.
-        ui_.BaseList _getBoxesForRange(int start, int end, int boxHeightStyle, int boxWidthStyle) =>
+        ui_.Float32List _getBoxesForRange(int start, int end, int boxHeightStyle, int boxWidthStyle) =>
             Paragraph_getRectsForRange(_ptr, start, end, boxHeightStyle, boxWidthStyle);
 
 
         }
 
-        ui_.BaseList _getBoxesForPlaceholders() => Paragraph_getRectsForPlaceholders(_ptr);
+        ui_.Float32List _getBoxesForPlaceholders() => Paragraph_getRectsForPlaceholders(_ptr);
 
         public unsafe TextPosition getPositionForOffset(Offset offset) {
             int[] encoded = new int[2];
 
             return metrics;
         }
-        ui_.BaseList _computeLineMetrics() => Paragraph_computeLineMetrics(_ptr);
+        ui_.Float32List _computeLineMetrics() => Paragraph_computeLineMetrics(_ptr);
     }
 
     public class ParagraphBuilder : NativeWrapper {

engine/Build.bee.cs

         };
         np.Libraries.Add(new BagOfObjectFilesLibrary(
             new NPath[]{
-                skiaRoot+"out/Debug/icudtl.o"
+                skiaRoot+"third_party/externals/icu/flutter/icudtl.o"
         }));
         np.CompilerSettings().Add(c => c.WithCppLanguageVersion(CppLanguageVersion.Cpp17));
         

engine/README.md

 ```
 Ignore this error: "lld-link: error: could not open 'EGL': no such file or directory"
 
-convert icudtl.dat to object file
+convert icudtl.dat to object file in skia
-cd out/Debug
-ld -r -b binary -o .\icudtl.o .\icudtl.dat
+cd SkiaRoot/third_party/externals/icu/flutter/icudtl.dat
+ld -r -b binary -o icudtl.o icudtl.dat
 ```
 ### Build flutter fml
 

engine/src/lib/ui/text/font_collection.cc

     return;
   }
 
-  // Structure described in https://flutter.io/custom-fonts/
-
   if (!document.IsArray()) {
     return;
   }

engine/src/lib/ui/text/icu_util.cc

     UErrorCode err_code = U_ZERO_ERROR;
     udata_setCommonData(GetMapping(), &err_code);
     return (err_code == U_ZERO_ERROR);
-    // return true;
   }
 
   const uint8_t* GetMapping() const {

engine/src/lib/ui/text/paragraph.h

 #pragma once
 
 #include "flutter/fml/memory/ref_counted.h"
-#include "flutter/third_party/txt/src/txt/paragraph.h"
+#include "txt/paragraph.h"
-#include "src/lib/ui/painting/canvas.h"
+#include "lib/ui/painting/canvas.h"
 #include "lib/ui/ui_mono_state.h"
 
 namespace uiwidgets {

engine/src/lib/ui/text/paragraph_builder.h

 #pragma once
 
 #include "flutter/fml/memory/ref_counted.h"
-#include "flutter/third_party/txt/src/txt/paragraph.h"
-#include "flutter/third_party/txt/src/txt/paragraph_builder.h"
+#include "txt/paragraph.h"
+#include "txt/paragraph_builder.h"
-#include "src/lib/ui/painting/canvas.h"
+#include "lib/ui/painting/canvas.h"
 
 namespace uiwidgets {
 

engine/src/render_api_d3d11.cc

 
 #include "Unity/IUnityGraphicsD3D11.h"
 #include "flutter/fml/message_loop.h"
-#include "flutter/third_party/txt/src/txt/paragraph.h"
-#include "flutter/third_party/txt/src/txt/paragraph_builder.h"
-#include "flutter/third_party/txt/src/txt/font_collection.h"
+#include "txt/paragraph.h"
+#include "txt/paragraph_builder.h"
+#include "txt/font_collection.h"
 
 #include "flutter/fml/synchronization/waitable_event.h"
 #include "include/core/SkCanvas.h"

engine/src/shell/common/shell.cc

 #define RAPIDJSON_HAS_STDSTRING 1
 #include "shell.h"
 
-#include <filesystem>
 #include <future>
 #include <memory>
 #include <sstream>
     if (settings.icu_initialization_required) {
       if (settings.icu_data_path.length() > 0) {
         uiwidgets::icu::InitializeICU(settings.icu_data_path);
-      } else {
+      } else if (settings.icu_mapper) {
+      } else {
+        FML_DLOG(WARNING) << "Skipping ICU initialization in the shell.";
       }
     }
   });

engine/src/shell/platform/unity/uiwidgets_panel.cc

 #include "lib/ui/window/viewport_metrics.h"
 #include "runtime/mono_api.h"
 #include "shell/platform/embedder/embedder_engine.h"
-#include "src/shell/common/switches.h"
+#include "shell/common/switches.h"
 #include "uiwidgets_system.h"
 
 namespace uiwidgets {