| Flutter Windows Embedder |

flutter_windows_engine.h
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef FLUTTER_SHELL_PLATFORM_WINDOWS_FLUTTER_WINDOWS_ENGINE_H_
6 #define FLUTTER_SHELL_PLATFORM_WINDOWS_FLUTTER_WINDOWS_ENGINE_H_
7
8 #include <chrono>
9 #include <map>
10 #include <memory>
11 #include <optional>
12 #include <string>
13 #include <string_view>
14 #include <unordered_map>
15 #include <vector>
16
17 #include "flutter/fml/closure.h"
18 #include "flutter/fml/macros.h"
19 #include "flutter/fml/synchronization/shared_mutex.h"
20 #include "flutter/shell/platform/common/accessibility_bridge.h"
21 #include "flutter/shell/platform/common/app_lifecycle_state.h"
22 #include "flutter/shell/platform/common/client_wrapper/binary_messenger_impl.h"
23 #include "flutter/shell/platform/common/client_wrapper/include/flutter/basic_message_channel.h"
24 #include "flutter/shell/platform/common/incoming_message_dispatcher.h"
25 #include "flutter/shell/platform/embedder/embedder.h"
26 #include "flutter/shell/platform/windows/accessibility_bridge_windows.h"
27 #include "flutter/shell/platform/windows/accessibility_plugin.h"
28 #include "flutter/shell/platform/windows/compositor.h"
29 #include "flutter/shell/platform/windows/cursor_handler.h"
30 #include "flutter/shell/platform/windows/egl/manager.h"
31 #include "flutter/shell/platform/windows/egl/proc_table.h"
32 #include "flutter/shell/platform/windows/flutter_desktop_messenger.h"
33 #include "flutter/shell/platform/windows/flutter_project_bundle.h"
34 #include "flutter/shell/platform/windows/flutter_windows_texture_registrar.h"
35 #include "flutter/shell/platform/windows/keyboard_handler_base.h"
36 #include "flutter/shell/platform/windows/keyboard_key_embedder_handler.h"
37 #include "flutter/shell/platform/windows/platform_handler.h"
38 #include "flutter/shell/platform/windows/platform_view_plugin.h"
39 #include "flutter/shell/platform/windows/public/flutter_windows.h"
40 #include "flutter/shell/platform/windows/settings_plugin.h"
41 #include "flutter/shell/platform/windows/task_runner.h"
42 #include "flutter/shell/platform/windows/text_input_plugin.h"
43 #include "flutter/shell/platform/windows/window_proc_delegate_manager.h"
44 #include "flutter/shell/platform/windows/window_state.h"
45 #include "flutter/shell/platform/windows/windows_lifecycle_manager.h"
46 #include "flutter/shell/platform/windows/windows_proc_table.h"
47 #include "third_party/rapidjson/include/rapidjson/document.h"
48
49 namespace flutter {
50
51 // The implicit view's ID.
52 //
53 // See:
54 // https://api.flutter.dev/flutter/dart-ui/PlatformDispatcher/implicitView.html
55 constexpr FlutterViewId kImplicitViewId = 0;
56
57 class FlutterWindowsView;
58
59 // Update the thread priority for the Windows engine.
60 static void WindowsPlatformThreadPrioritySetter(
61 FlutterThreadPriority priority) {
62 // TODO(99502): Add support for tracing to the windows embedding so we can
63 // mark thread priorities and success/failure.
64 switch (priority) {
65 case FlutterThreadPriority::kBackground: {
66 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_BELOW_NORMAL);
67 break;
68 }
69 case FlutterThreadPriority::kDisplay: {
70 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
71 break;
72 }
73 case FlutterThreadPriority::kRaster: {
74 SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_ABOVE_NORMAL);
75 break;
76 }
77 case FlutterThreadPriority::kNormal: {
78 // For normal or default priority we do not need to set the priority
79 // class.
80 break;
81 }
82 }
83 }
84
85 // Manages state associated with the underlying FlutterEngine that isn't
86 // related to its display.
87 //
88 // In most cases this will be associated with a FlutterView, but if not will
89 // run in headless mode.
90 class FlutterWindowsEngine {
91 public:
92 // Creates a new Flutter engine object configured to run |project|.
93 FlutterWindowsEngine(
94 const FlutterProjectBundle& project,
95 std::shared_ptr<WindowsProcTable> windows_proc_table = nullptr);
96
97 virtual ~FlutterWindowsEngine();
98
99 // Starts running the entrypoint function specifed in the project bundle. If
100 // unspecified, defaults to main().
101 //
102 // Returns false if the engine couldn't be started.
103 bool Run();
104
105 // Starts running the engine with the given entrypoint. If the empty string
106 // is specified, defaults to the entrypoint function specified in the project
107 // bundle, or main() if both are unspecified.
108 //
109 // Returns false if the engine couldn't be started or if conflicting,
110 // non-default values are passed here and in the project bundle..
111 //
112 // DEPRECATED: Prefer setting the entrypoint in the FlutterProjectBundle
113 // passed to the constructor and calling the no-parameter overload.
114 bool Run(std::string_view entrypoint);
115
116 // Returns true if the engine is currently running.
117 virtual bool running() const { return engine_ != nullptr; }
118
119 // Stops the engine. This invalidates the pointer returned by engine().
120 //
121 // Returns false if stopping the engine fails, or if it was not running.
122 virtual bool Stop();
123
124 // Create a view that can display this engine's content.
125 //
126 // Returns null on failure.
127 std::unique_ptr<FlutterWindowsView> CreateView(
128 std::unique_ptr<WindowBindingHandler> window);
129
130 // Remove a view. The engine will no longer render into it.
131 virtual void RemoveView(FlutterViewId view_id);
132
133 // Get a view that displays this engine's content.
134 //
135 // Returns null if the view does not exist.
136 FlutterWindowsView* view(FlutterViewId view_id) const;
137
138 // Returns the currently configured Plugin Registrar.
139 FlutterDesktopPluginRegistrarRef GetRegistrar();
140
141 // Registers |callback| to be called when the plugin registrar is destroyed.
142 void AddPluginRegistrarDestructionCallback(
143 FlutterDesktopOnPluginRegistrarDestroyed callback,
144 FlutterDesktopPluginRegistrarRef registrar);
145
146 // Sets switches member to the given switches.
147 void SetSwitches(const std::vector<std::string>& switches);
148
149 FlutterDesktopMessengerRef messenger() { return messenger_->ToRef(); }
150
151 IncomingMessageDispatcher* message_dispatcher() {
152 return message_dispatcher_.get();
153 }
154
155 TaskRunner* task_runner() { return task_runner_.get(); }
156
157 BinaryMessenger* messenger_wrapper() { return messenger_wrapper_.get(); }
158
159 FlutterWindowsTextureRegistrar* texture_registrar() {
160 return texture_registrar_.get();
161 }
162
163 // The EGL manager object. If this is nullptr, then we are
164 // rendering using software instead of OpenGL.
165 egl::Manager* egl_manager() const { return egl_manager_.get(); }
166
167 WindowProcDelegateManager* window_proc_delegate_manager() {
168 return window_proc_delegate_manager_.get();
169 }
170
171 // Informs the engine that the window metrics have changed.
172 void SendWindowMetricsEvent(const FlutterWindowMetricsEvent& event);
173
174 // Informs the engine of an incoming pointer event.
175 void SendPointerEvent(const FlutterPointerEvent& event);
176
177 // Informs the engine of an incoming key event.
178 void SendKeyEvent(const FlutterKeyEvent& event,
179 FlutterKeyEventCallback callback,
180 void* user_data);
181
182 KeyboardHandlerBase* keyboard_key_handler() {
183 return keyboard_key_handler_.get();
184 }
185 TextInputPlugin* text_input_plugin() { return text_input_plugin_.get(); }
186
187 // Sends the given message to the engine, calling |reply| with |user_data|
188 // when a response is received from the engine if they are non-null.
189 bool SendPlatformMessage(const char* channel,
190 const uint8_t* message,
191 const size_t message_size,
192 const FlutterDesktopBinaryReply reply,
193 void* user_data);
194
195 // Sends the given data as the response to an earlier platform message.
196 void SendPlatformMessageResponse(
197 const FlutterDesktopMessageResponseHandle* handle,
198 const uint8_t* data,
199 size_t data_length);
200
201 // Callback passed to Flutter engine for notifying window of platform
202 // messages.
203 void HandlePlatformMessage(const FlutterPlatformMessage*);
204
205 // Informs the engine that the system font list has changed.
206 void ReloadSystemFonts();
207
208 // Informs the engine that a new frame is needed to redraw the content.
209 void ScheduleFrame();
210
211 // Set the callback that is called when the next frame is drawn.
212 void SetNextFrameCallback(fml::closure callback);
213
214 // Attempts to register the texture with the given |texture_id|.
215 bool RegisterExternalTexture(int64_t texture_id);
216
217 // Attempts to unregister the texture with the given |texture_id|.
218 bool UnregisterExternalTexture(int64_t texture_id);
219
220 // Notifies the engine about a new frame being available for the
221 // given |texture_id|.
222 bool MarkExternalTextureFrameAvailable(int64_t texture_id);
223
224 // Posts the given callback onto the raster thread.
225 virtual bool PostRasterThreadTask(fml::closure callback) const;
226
227 // Invoke on the embedder's vsync callback to schedule a frame.
228 void OnVsync(intptr_t baton);
229
230 // Dispatches a semantics action to the specified semantics node.
231 bool DispatchSemanticsAction(uint64_t id,
232 FlutterSemanticsAction action,
233 fml::MallocMapping data);
234
235 // Informs the engine that the semantics enabled state has changed.
236 void UpdateSemanticsEnabled(bool enabled);
237
238 // Returns true if the semantics tree is enabled.
239 bool semantics_enabled() const { return semantics_enabled_; }
240
241 // Refresh accessibility features and send them to the engine.
242 void UpdateAccessibilityFeatures();
243
244 // Refresh high contrast accessibility mode and notify the engine.
245 void UpdateHighContrastMode();
246
247 // Returns true if the high contrast feature is enabled.
248 bool high_contrast_enabled() const { return high_contrast_enabled_; }
249
250 // Register a root isolate create callback.
251 //
252 // The root isolate create callback is invoked at creation of the root Dart
253 // isolate in the app. This may be used to be notified that execution of the
254 // main Dart entrypoint is about to begin, and is used by test infrastructure
255 // to register a native function resolver that can register and resolve
256 // functions marked as native in the Dart code.
257 //
258 // This must be called before calling |Run|.
259 void SetRootIsolateCreateCallback(const fml::closure& callback) {
260 root_isolate_create_callback_ = callback;
261 }
262
263 // Returns the executable name for this process or "Flutter" if unknown.
264 std::string GetExecutableName() const;
265
266 // Called when the application quits in response to a quit request.
267 void OnQuit(std::optional<HWND> hwnd,
268 std::optional<WPARAM> wparam,
269 std::optional<LPARAM> lparam,
270 UINT exit_code);
271
272 // Called when a WM_CLOSE message is received.
273 void RequestApplicationQuit(HWND hwnd,
274 WPARAM wparam,
275 LPARAM lparam,
276 AppExitType exit_type);
277
278 // Called when a WM_DWMCOMPOSITIONCHANGED message is received.
279 void OnDwmCompositionChanged();
280
281 // Called when a Window receives an event that may alter the application
282 // lifecycle state.
283 void OnWindowStateEvent(HWND hwnd, WindowStateEvent event);
284
285 // Handle a message from a non-Flutter window in the same application.
286 // Returns a result when the message is consumed and should not be processed
287 // further.
288 std::optional<LRESULT> ProcessExternalWindowMessage(HWND hwnd,
289 UINT message,
290 WPARAM wparam,
291 LPARAM lparam);
292
293 WindowsLifecycleManager* lifecycle_manager() {
294 return lifecycle_manager_.get();
295 }
296
297 std::shared_ptr<WindowsProcTable> windows_proc_table() {
298 return windows_proc_table_;
299 }
300
301 protected:
302 // Creates the keyboard key handler.
303 //
304 // Exposing this method allows unit tests to override in order to
305 // capture information.
306 virtual std::unique_ptr<KeyboardHandlerBase> CreateKeyboardKeyHandler(
307 BinaryMessenger* messenger,
308 KeyboardKeyEmbedderHandler::GetKeyStateHandler get_key_state,
309 KeyboardKeyEmbedderHandler::MapVirtualKeyToScanCode map_vk_to_scan);
310
311 // Creates the text input plugin.
312 //
313 // Exposing this method allows unit tests to override in order to
314 // capture information.
315 virtual std::unique_ptr<TextInputPlugin> CreateTextInputPlugin(
316 BinaryMessenger* messenger);
317
318 // Invoked by the engine right before the engine is restarted.
319 //
320 // This should reset necessary states to as if the engine has just been
321 // created. This is typically caused by a hot restart (Shift-R in CLI.)
322 void OnPreEngineRestart();
323
324 // Invoked by the engine when a listener is set or cleared on a platform
325 // channel.
326 virtual void OnChannelUpdate(std::string name, bool listening);
327
328 private:
329 // Allows swapping out embedder_api_ calls in tests.
330 friend class EngineModifier;
331
332 // Sends system locales to the engine.
333 //
334 // Should be called just after the engine is run, and after any relevant
335 // system changes.
336 void SendSystemLocales();
337
338 // Sends the current lifecycle state to the framework.
339 void SetLifecycleState(flutter::AppLifecycleState state);
340
341 // Create the keyboard & text input sub-systems.
342 //
343 // This requires that a view is attached to the engine.
344 // Calling this method again resets the keyboard state.
345 void InitializeKeyboard();
346
347 // Send the currently enabled accessibility features to the engine.
348 void SendAccessibilityFeatures();
349
350 // Present content to a view. Returns true if the content was presented.
351 //
352 // This is invoked on the raster thread.
353 bool Present(const FlutterPresentViewInfo* info);
354
355 // The handle to the embedder.h engine instance.
356 FLUTTER_API_SYMBOL(FlutterEngine) engine_ = nullptr;
357
358 FlutterEngineProcTable embedder_api_ = {};
359
360 std::unique_ptr<FlutterProjectBundle> project_;
361
362 // AOT data, if any.
363 UniqueAotDataPtr aot_data_;
364
365 // The ID that the next view will have.
366 FlutterViewId next_view_id_ = kImplicitViewId;
367
368 // The views displaying the content running in this engine, if any.
369 //
370 // This is read and mutated by the platform thread. This is read by the raster
371 // thread to present content to a view.
372 //
373 // Reads to this object on non-platform threads must be protected
374 // by acquiring a shared lock on |views_mutex_|.
375 //
376 // Writes to this object must only happen on the platform thread
377 // and must be protected by acquiring an exclusive lock on |views_mutex_|.
378 std::unordered_map<FlutterViewId, FlutterWindowsView*> views_;
379
380 // The mutex that protects the |views_| map.
381 //
382 // The raster thread acquires a shared lock to present to a view.
383 //
384 // The platform thread acquires a shared lock to access the view.
385 // The platform thread acquires an exclusive lock before adding
386 // a view to the engine or after removing a view from the engine.
387 std::unique_ptr<fml::SharedMutex> views_mutex_;
388
389 // Task runner for tasks posted from the engine.
390 std::unique_ptr<TaskRunner> task_runner_;
391
392 // The plugin messenger handle given to API clients.
393 fml::RefPtr<flutter::FlutterDesktopMessenger> messenger_;
394
395 // A wrapper around messenger_ for interacting with client_wrapper-level APIs.
396 std::unique_ptr<BinaryMessengerImpl> messenger_wrapper_;
397
398 // Message dispatch manager for messages from engine_.
399 std::unique_ptr<IncomingMessageDispatcher> message_dispatcher_;
400
401 // The plugin registrar handle given to API clients.
402 std::unique_ptr<FlutterDesktopPluginRegistrar> plugin_registrar_;
403
404 // The texture registrar.
405 std::unique_ptr<FlutterWindowsTextureRegistrar> texture_registrar_;
406
407 // An object used for intializing ANGLE and creating / destroying render
408 // surfaces. If nullptr, ANGLE failed to initialize and software rendering
409 // should be used instead.
410 std::unique_ptr<egl::Manager> egl_manager_;
411
412 // The compositor that creates backing stores for the engine to render into
413 // and then presents them onto views.
414 std::unique_ptr<Compositor> compositor_;
415
416 // The plugin registrar managing internal plugins.
417 std::unique_ptr<PluginRegistrar> internal_plugin_registrar_;
418
419 // Handler for accessibility events.
420 std::unique_ptr<AccessibilityPlugin> accessibility_plugin_;
421
422 // Handler for cursor events.
423 std::unique_ptr<CursorHandler> cursor_handler_;
424
425 // Handler for the flutter/platform channel.
426 std::unique_ptr<PlatformHandler> platform_handler_;
427
428 // Handlers for keyboard events from Windows.
429 std::unique_ptr<KeyboardHandlerBase> keyboard_key_handler_;
430
431 // Handlers for text events from Windows.
432 std::unique_ptr<TextInputPlugin> text_input_plugin_;
433
434 // The settings plugin.
435 std::unique_ptr<SettingsPlugin> settings_plugin_;
436
437 // Callbacks to be called when the engine (and thus the plugin registrar) is
438 // being destroyed.
439 std::map<FlutterDesktopOnPluginRegistrarDestroyed,
440 FlutterDesktopPluginRegistrarRef>
441 plugin_registrar_destruction_callbacks_;
442
443 // The approximate time between vblank events.
444 std::chrono::nanoseconds FrameInterval();
445
446 // The start time used to align frames.
447 std::chrono::nanoseconds start_time_ = std::chrono::nanoseconds::zero();
448
449 // An override of the frame interval used by EngineModifier for testing.
450 std::optional<std::chrono::nanoseconds> frame_interval_override_ =
451 std::nullopt;
452
453 bool semantics_enabled_ = false;
454
455 bool high_contrast_enabled_ = false;
456
457 bool enable_impeller_ = false;
458
459 // The manager for WindowProc delegate registration and callbacks.
460 std::unique_ptr<WindowProcDelegateManager> window_proc_delegate_manager_;
461
462 // The root isolate creation callback.
463 fml::closure root_isolate_create_callback_;
464
465 // The on frame drawn callback.
466 fml::closure next_frame_callback_;
467
468 // Handler for top level window messages.
469 std::unique_ptr<WindowsLifecycleManager> lifecycle_manager_;
470
471 std::shared_ptr<WindowsProcTable> windows_proc_table_;
472
473 std::shared_ptr<egl::ProcTable> gl_;
474
475 std::unique_ptr<PlatformViewPlugin> platform_view_plugin_;
476
477 FML_DISALLOW_COPY_AND_ASSIGN(FlutterWindowsEngine);
478 };
479
480 } // namespace flutter
481
482 #endif // FLUTTER_SHELL_PLATFORM_WINDOWS_FLUTTER_WINDOWS_ENGINE_H_
flutter::kImplicitViewId
constexpr FlutterViewId kImplicitViewId
Definition: flutter_windows_engine.h:55
flutter::FlutterWindowsEngine::RequestApplicationQuit
void RequestApplicationQuit(HWND hwnd, WPARAM wparam, LPARAM lparam, AppExitType exit_type)
Definition: flutter_windows_engine.cc:939
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WindowStateEvent
An event representing a change in window state that may update the.
Definition: windows_lifecycle_manager.h:24
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Definition: flutter_windows_engine.cc:668
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virtual bool PostRasterThreadTask(fml::closure callback) const
Definition: flutter_windows_engine.cc:856
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bool high_contrast_enabled() const
Definition: flutter_windows_engine.h:248
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Definition: flutter_project_bundle.h:21
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virtual void OnChannelUpdate(std::string name, bool listening)
Definition: flutter_windows_engine.cc:978
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virtual std::unique_ptr< TextInputPlugin > CreateTextInputPlugin(BinaryMessenger *messenger)
Definition: flutter_windows_engine.cc:835
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bool UnregisterExternalTexture(int64_t texture_id)
Definition: flutter_windows_engine.cc:845
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AppExitType
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FlutterWindowsView * view(FlutterViewId view_id) const
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void SendPointerEvent(const FlutterPointerEvent &event)
Definition: flutter_windows_engine.cc:685
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std::unique_ptr< _FlutterEngineAOTData, FlutterEngineCollectAOTDataFnPtr > UniqueAotDataPtr
Definition: flutter_project_bundle.h:18
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Definition: flutter_windows_view.h:34
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Definition: incoming_message_dispatcher.h:20
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void OnVsync(intptr_t baton)
Definition: flutter_windows_engine.cc:628
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TaskRunner * task_runner()
Definition: flutter_windows_engine.h:155
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void SetNextFrameCallback(fml::closure callback)
Definition: flutter_windows_engine.cc:762
user_data
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Definition: flutter_windows_view_unittests.cc:53
flutter::FlutterWindowsEngine::EngineModifier
friend class EngineModifier
Definition: flutter_windows_engine.h:330
flutter::FlutterWindowsEngine
Definition: flutter_windows_engine.h:90
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bool MarkExternalTextureFrameAvailable(int64_t texture_id)
Definition: flutter_windows_engine.cc:850
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std::function< SHORT(int)> GetKeyStateHandler
Definition: keyboard_key_embedder_handler.h:41
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Definition: flutter_windows_engine.h:167
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Definition: flutter_windows_engine.cc:840
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virtual bool running() const
Definition: flutter_windows_engine.h:117
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Definition: flutter_windows_engine.h:293
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virtual void RemoveView(FlutterViewId view_id)
Definition: flutter_windows_engine.cc:566
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Definition: flutter_windows_engine.h:157
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FlutterWindowsEngine(const FlutterProjectBundle &project, std::shared_ptr< WindowsProcTable > windows_proc_table=nullptr)
Definition: flutter_windows_engine.cc:147
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void OnQuit(std::optional< HWND > hwnd, std::optional< WPARAM > wparam, std::optional< LPARAM > lparam, UINT exit_code)
Definition: flutter_windows_engine.cc:946
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struct _FlutterPlatformMessageResponseHandle FlutterDesktopMessageResponseHandle
Definition: flutter_messenger.h:22
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void SetRootIsolateCreateCallback(const fml::closure &callback)
Definition: flutter_windows_engine.h:259
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std::shared_ptr< WindowsProcTable > windows_proc_table()
Definition: flutter_windows_engine.h:297
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void SetSwitches(const std::vector< std::string > &switches)
Definition: flutter_windows_engine.cc:234
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Definition: flutter_windows_engine.cc:229
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Definition: flutter_windows_engine.cc:699
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void OnPreEngineRestart()
Definition: flutter_windows_engine.cc:897
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Definition: keyboard_key_embedder_handler.h:43
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virtual bool Stop()
Definition: flutter_windows_engine.cc:482
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Definition: flutter_windows_engine.h:149
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Definition: flutter_windows_engine.cc:966
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Definition: binary_messenger.h:28
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void OnDwmCompositionChanged()
Definition: flutter_windows_engine.cc:953
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void SendWindowMetricsEvent(const FlutterWindowMetricsEvent &event)
Definition: flutter_windows_engine.cc:678
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Definition: flutter_windows_engine.cc:876
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virtual std::unique_ptr< KeyboardHandlerBase > CreateKeyboardKeyHandler(BinaryMessenger *messenger, KeyboardKeyEmbedderHandler::GetKeyStateHandler get_key_state, KeyboardKeyEmbedderHandler::MapVirtualKeyToScanCode map_vk_to_scan)
Definition: flutter_windows_engine.cc:817
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Definition: flutter_windows_texture_registrar.h:24
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FlutterWindowsTextureRegistrar * texture_registrar()
Definition: flutter_windows_engine.h:159
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Definition: flutter_windows_engine.h:239
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Definition: accessibility_bridge_windows.cc:11
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Definition: flutter_windows_engine.cc:733
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Definition: flutter_windows_engine.h:182
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Definition: flutter_plugin_registrar.h:23
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Definition: flutter_windows_engine.cc:691
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IncomingMessageDispatcher * message_dispatcher()
Definition: flutter_windows_engine.h:151
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Definition: flutter_windows_engine.h:185
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Definition: text_input_plugin.h:28
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Definition: flutter_windows_engine.cc:758
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Definition: flutter_windows_engine.cc:920
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Definition: flutter_messenger.h:19
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Definition: keyboard_handler_base.h:18
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Definition: flutter_windows_engine.cc:885
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Definition: windows_lifecycle_manager.h:37
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Definition: flutter_windows_engine.h:165
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Definition: window_state.h:23
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Definition: flutter_windows_engine.cc:961
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Definition: flutter_windows_engine.cc:740
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Definition: flutter_windows_engine.cc:239
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Definition: flutter_windows_engine.cc:902
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Definition: flutter_windows_view_unittests.cc:52