fix Windows build.dart to avoid native_assets fork; add implementations for ThermionFlutterWindows

thermion_flutter/thermion_flutter/windows/backing_window.cpp

@@ -152,8 +152,20 @@ LRESULT CALLBACK FilamentWindowProc(HWND const window, UINT const message,
     break;
   }
   case WM_ERASEBKGND: {
-    // Prevent erasing of |window| when it is unfocused and minimized or
-    // moved out of screen etc.
+      HDC hdc = (HDC)wparam;
+      RECT rect;
+      GetClientRect(window, &rect);
+      
+      // Get the BackingWindow instance associated with this window
+      BackingWindow* backing_window = reinterpret_cast<BackingWindow*>(
+          GetWindowLongPtr(window, GWLP_USERDATA));
+      
+      if (backing_window) {
+        HBRUSH brush = CreateSolidBrush(RGB(0, 255, 0));
+        FillRect(hdc, &rect, brush);
+        DeleteObject(brush);
+      }
+    
     break;
   }
   case WM_SIZE:
@@ -346,8 +358,6 @@ void BackingWindow::Resize(int width, int height, int left, int top) {
   _top = top;
   RECT flutterViewRect;
   ::GetWindowRect(_flutterViewWindow, &flutterViewRect);
-    std::cout << "Resizing to " << _width << " x " << _height << " with LT" << _left << " " << _top << " flutter view rect" << flutterViewRect.left << " " << flutterViewRect.top  << " " << flutterViewRect.right << " " << flutterViewRect.bottom << std::endl;
-
   ::SetWindowPos(_windowHandle, _flutterRootWindow, flutterViewRect.left + _left,
                  flutterViewRect.top + _top, _width, _height,
                  SWP_NOACTIVATE);

thermion_flutter/thermion_flutter/windows/thermion_flutter_plugin.cpp

@@ -172,8 +172,6 @@ void ThermionFlutterPlugin::CreateTexture(
   auto height = (uint32_t)round(dHeight );
   auto left = (uint32_t)round(dLeft );
   auto top = (uint32_t)round(dTop );
-
-  std::cout << "Using " << width << "x" << height << std::endl;
   
   // create a single shared context for the life of the application
   // this will be used to create a backing texture and passed to Filament
@@ -182,8 +180,10 @@ void ThermionFlutterPlugin::CreateTexture(
     _context = std::make_unique<FlutterEGLContext>(_pluginRegistrar, _textureRegistrar);
 #else
     _context = std::make_unique<WGLContext>(_pluginRegistrar, _textureRegistrar);
+    std::cout << "Created WGL context" << std::endl;
 #endif
   }
+        
   _context->CreateRenderingSurface(width, height, std::move(result), left, top);
 }
 
@@ -210,7 +210,7 @@ void ThermionFlutterPlugin::DestroyTexture(
 void ThermionFlutterPlugin::HandleMethodCall(
     const flutter::MethodCall<flutter::EncodableValue> &methodCall,
     std::unique_ptr<flutter::MethodResult<flutter::EncodableValue>> result) {
-
+  std::cout << methodCall.method_name().c_str() << std::endl;
   if (methodCall.method_name() == "usesBackingWindow") {
     result->Success(flutter::EncodableValue(
       #ifdef WGL_USE_BACKING_WINDOW
@@ -243,14 +243,16 @@ void ThermionFlutterPlugin::HandleMethodCall(
       auto height = (uint32_t)round(dHeight );
       auto left = (uint32_t)round(dLeft );
       auto top = (uint32_t)round(dTop );
+      
       _context->ResizeRenderingSurface(width, height, left, top);
+      std::cout << "resized window to " << width << "x" << height << " at "  << left << "," << top << std::endl;
       result->Success();
     #else
       result->Error("ERROR", "resizeWindow is only available when using a backing window");
     #endif
-  } else if (methodCall.method_name() == "createTexture") {
+  } else if (methodCall.method_name() == "createWindow") {
     CreateTexture(methodCall, std::move(result));
-  } else if (methodCall.method_name() == "destroyTexture") {
+  } else if (methodCall.method_name() == "destroyWindow") {
     DestroyTexture(methodCall, std::move(result));
   } else if (methodCall.method_name() == "getRenderCallback") {
     flutter::EncodableList resultList;

thermion_flutter/thermion_flutter/windows/wgl_context.cpp

@@ -45,7 +45,7 @@ WGLContext::WGLContext(flutter::PluginRegistrarWindows *pluginRegistrar,
       0,
       0,
       0,
-      16, // Number of bits for the depthbuffer
+      24, // Number of bits for the depthbuffer
       0,  // Number of bits for the stencilbuffer
       0,  // Number of Aux buffers in the framebuffer.
       PFD_MAIN_PLANE,
@@ -117,6 +117,8 @@ void WGLContext::CreateRenderingSurface(
   } else { 
     ResizeRenderingSurface(width, height, left, top);
   }
+
+  std::cout << "created window size " << width << "x" << height << " at "  << left << "," << top << " with backing handle" << _backingWindow->GetHandle() << std::endl;
   std::vector<flutter::EncodableValue> resultList;
   resultList.push_back(flutter::EncodableValue()); // return null for Flutter texture ID
   resultList.push_back(flutter::EncodableValue()); // return null for hardware texture ID