widget/nsBaseWidget.cpp

   1
   2 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   3 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #include "nsBaseWidget.h"
   9
  10 #include <utility>
  11
  12 #include "BasicLayers.h"
  13 #include "ClientLayerManager.h"
  14 #include "FrameLayerBuilder.h"
  15 #include "GLConsts.h"
  16 #include "InputData.h"
  17 #include "LiveResizeListener.h"
  18 #include "TouchEvents.h"
  19 #include "WritingModes.h"
  20 #include "X11UndefineNone.h"
  21 #include "base/thread.h"
  22 #include "mozilla/ArrayUtils.h"
  23 #include "mozilla/Attributes.h"
  24 #include "mozilla/GlobalKeyListener.h"
  25 #include "mozilla/IMEStateManager.h"
  26 #include "mozilla/MouseEvents.h"
  27 #include "mozilla/Preferences.h"
  28 #include "mozilla/PresShell.h"
  29 #include "mozilla/Sprintf.h"
  30 #include "mozilla/StaticPrefs_apz.h"
  31 #include "mozilla/StaticPrefs_dom.h"
  32 #include "mozilla/StaticPrefs_gfx.h"
  33 #include "mozilla/StaticPrefs_layers.h"
  34 #include "mozilla/StaticPrefs_layout.h"
  35 #include "mozilla/TextEventDispatcher.h"
  36 #include "mozilla/TextEventDispatcherListener.h"
  37 #include "mozilla/UniquePtr.h"
  38 #include "mozilla/Unused.h"
  39 #include "mozilla/VsyncDispatcher.h"
  40 #include "mozilla/dom/BrowserParent.h"
  41 #include "mozilla/dom/ContentChild.h"
  42 #include "mozilla/dom/Document.h"
  43 #include "mozilla/gfx/2D.h"
  44 #include "mozilla/gfx/GPUProcessManager.h"
  45 #include "mozilla/gfx/gfxVars.h"
  46 #include "mozilla/layers/APZCCallbackHelper.h"
  47 #include "mozilla/layers/APZEventState.h"
  48 #include "mozilla/layers/APZInputBridge.h"
  49 #include "mozilla/layers/APZThreadUtils.h"
  50 #include "mozilla/layers/ChromeProcessController.h"
  51 #include "mozilla/layers/Compositor.h"
  52 #include "mozilla/layers/CompositorBridgeChild.h"
  53 #include "mozilla/layers/CompositorBridgeParent.h"
  54 #include "mozilla/layers/CompositorOptions.h"
  55 #include "mozilla/layers/IAPZCTreeManager.h"
  56 #include "mozilla/layers/ImageBridgeChild.h"
  57 #include "mozilla/layers/InputAPZContext.h"
  58 #include "mozilla/layers/PLayerTransactionChild.h"
  59 #include "mozilla/layers/WebRenderLayerManager.h"
  60 #include "mozilla/webrender/WebRenderTypes.h"
  61 #include "npapi.h"
  62 #include "nsAppDirectoryServiceDefs.h"
  63 #include "nsCOMPtr.h"
  64 #include "nsContentUtils.h"
  65 #include "nsDeviceContext.h"
  66 #include "nsGfxCIID.h"
  67 #include "nsIAppWindow.h"
  68 #include "nsIBaseWindow.h"
  69 #include "nsIContent.h"
  70 #include "nsIScreenManager.h"
  71 #include "nsISimpleEnumerator.h"
  72 #include "nsIWidgetListener.h"
  73 #include "nsRefPtrHashtable.h"
  74 #include "nsServiceManagerUtils.h"
  75 #include "nsWidgetsCID.h"
  76 #include "nsXULPopupManager.h"
  77 #include "prdtoa.h"
  78 #include "prenv.h"
  79 #ifdef ACCESSIBILITY
  80 #  include "nsAccessibilityService.h"
  81 #endif
  82 #include "gfxConfig.h"
  83 #include "gfxUtils.h"  // for ToDeviceColor
  84 #include "mozilla/layers/CompositorSession.h"
  85 #include "VRManagerChild.h"
  86 #include "gfxConfig.h"
  87 #include "nsView.h"
  88 #include "nsViewManager.h"
  89
  90 #ifdef DEBUG
  91 #  include "nsIObserver.h"
  92
  93 static void debug_RegisterPrefCallbacks();
  94
  95 #endif
  96
  97 #ifdef NOISY_WIDGET_LEAKS
  98 static int32_t gNumWidgets;
  99 #endif
 100
 101 #ifdef XP_MACOSX
 102 #  include "nsCocoaFeatures.h"
 103 #endif
 104
 105 #if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
 106 static nsRefPtrHashtable<nsVoidPtrHashKey, nsIWidget>* sPluginWidgetList;
 107 #endif
 108
 109 nsIRollupListener* nsBaseWidget::gRollupListener = nullptr;
 110
 111 using namespace mozilla::dom;
 112 using namespace mozilla::layers;
 113 using namespace mozilla::ipc;
 114 using namespace mozilla::widget;
 115 using namespace mozilla;
 116
 117 // Async pump timer during injected long touch taps
 118 #define TOUCH_INJECT_PUMP_TIMER_MSEC 50
 119 #define TOUCH_INJECT_LONG_TAP_DEFAULT_MSEC 1500
 120 int32_t nsIWidget::sPointerIdCounter = 0;
 121
 122 // Some statics from nsIWidget.h
 123 /*static*/
 124 uint64_t AutoObserverNotifier::sObserverId = 0;
 125 /*static*/ nsTHashMap<uint64_t, nsCOMPtr<nsIObserver>>
 126     AutoObserverNotifier::sSavedObservers;
 127
 128 // The maximum amount of time to let the EnableDragDrop runnable wait in the
 129 // idle queue before timing out and moving it to the regular queue. Value is in
 130 // milliseconds.
 131 const uint32_t kAsyncDragDropTimeout = 1000;
 132
 133 namespace mozilla::widget {
 134
 135 void IMENotification::SelectionChangeDataBase::SetWritingMode(
 136     const WritingMode& aWritingMode) {
 137   mWritingMode = aWritingMode.mWritingMode.bits;
 138 }
 139
 140 WritingMode IMENotification::SelectionChangeDataBase::GetWritingMode() const {
 141   return WritingMode(mWritingMode);
 142 }
 143
 144 }  // namespace mozilla::widget
 145
 146 NS_IMPL_ISUPPORTS(nsBaseWidget, nsIWidget, nsISupportsWeakReference)
 147
 148 //-------------------------------------------------------------------------
 149 //
 150 // nsBaseWidget constructor
 151 //
 152 //-------------------------------------------------------------------------
 153
 154 nsBaseWidget::nsBaseWidget()
 155     : mWidgetListener(nullptr),
 156       mAttachedWidgetListener(nullptr),
 157       mPreviouslyAttachedWidgetListener(nullptr),
 158       mLayerManager(nullptr),
 159       mCompositorVsyncDispatcher(nullptr),
 160       mCursor(eCursor_standard),
 161       mBorderStyle(eBorderStyle_none),
 162       mBounds(0, 0, 0, 0),
 163       mOriginalBounds(nullptr),
 164       mClipRectCount(0),
 165       mSizeMode(nsSizeMode_Normal),
 166       mIsTiled(false),
 167       mPopupLevel(ePopupLevelTop),
 168       mPopupType(ePopupTypeAny),
 169       mHasRemoteContent(false),
 170       mFissionWindow(false),
 171       mUpdateCursor(true),
 172       mUseAttachedEvents(false),
 173       mIMEHasFocus(false),
 174       mIMEHasQuit(false),
 175       mIsFullyOccluded(false) {
 176 #ifdef NOISY_WIDGET_LEAKS
 177   gNumWidgets++;
 178   printf("WIDGETS+ = %d\n", gNumWidgets);
 179 #endif
 180
 181 #ifdef DEBUG
 182   debug_RegisterPrefCallbacks();
 183 #endif
 184
 185 #if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
 186   if (!sPluginWidgetList) {
 187     sPluginWidgetList = new nsRefPtrHashtable<nsVoidPtrHashKey, nsIWidget>();
 188   }
 189 #endif
 190   mShutdownObserver = new WidgetShutdownObserver(this);
 191 }
 192
 193 NS_IMPL_ISUPPORTS(WidgetShutdownObserver, nsIObserver)
 194
 195 WidgetShutdownObserver::WidgetShutdownObserver(nsBaseWidget* aWidget)
 196     : mWidget(aWidget), mRegistered(false) {
 197   Register();
 198 }
 199
 200 WidgetShutdownObserver::~WidgetShutdownObserver() {
 201   // No need to call Unregister(), we can't be destroyed until nsBaseWidget
 202   // gets torn down. The observer service and nsBaseWidget have a ref on us
 203   // so nsBaseWidget has to call Unregister and then clear its ref.
 204 }
 205
 206 NS_IMETHODIMP
 207 WidgetShutdownObserver::Observe(nsISupports* aSubject, const char* aTopic,
 208                                 const char16_t* aData) {
 209   if (!mWidget) {
 210     return NS_OK;
 211   }
 212   if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
 213     RefPtr<nsBaseWidget> widget(mWidget);
 214     widget->Shutdown();
 215   } else if (!strcmp(aTopic, "quit-application")) {
 216     RefPtr<nsBaseWidget> widget(mWidget);
 217     widget->QuitIME();
 218   }
 219   return NS_OK;
 220 }
 221
 222 void WidgetShutdownObserver::Register() {
 223   if (!mRegistered) {
 224     mRegistered = true;
 225     nsContentUtils::RegisterShutdownObserver(this);
 226
 227 #ifndef MOZ_WIDGET_ANDROID
 228     // The primary purpose of observing quit-application is
 229     // to avoid leaking a widget on Windows when nothing else
 230     // breaks the circular reference between the widget and
 231     // TSFTextStore. However, our Android IME code crashes if
 232     // doing this on Android, so let's not do this on Android.
 233     // Doing this on Gtk and Mac just in case.
 234     nsCOMPtr<nsIObserverService> observerService =
 235         mozilla::services::GetObserverService();
 236     if (observerService) {
 237       observerService->AddObserver(this, "quit-application", false);
 238     }
 239 #endif
 240   }
 241 }
 242
 243 void WidgetShutdownObserver::Unregister() {
 244   if (mRegistered) {
 245     mWidget = nullptr;
 246
 247 #ifndef MOZ_WIDGET_ANDROID
 248     nsCOMPtr<nsIObserverService> observerService =
 249         mozilla::services::GetObserverService();
 250     if (observerService) {
 251       observerService->RemoveObserver(this, "quit-application");
 252     }
 253 #endif
 254
 255     nsContentUtils::UnregisterShutdownObserver(this);
 256     mRegistered = false;
 257   }
 258 }
 259
 260 void nsBaseWidget::Shutdown() {
 261   NotifyLiveResizeStopped();
 262   RevokeTransactionIdAllocator();
 263   DestroyCompositor();
 264   FreeShutdownObserver();
 265 #if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
 266   if (sPluginWidgetList) {
 267     delete sPluginWidgetList;
 268     sPluginWidgetList = nullptr;
 269   }
 270 #endif
 271 }
 272
 273 void nsBaseWidget::QuitIME() {
 274   IMEStateManager::WidgetOnQuit(this);
 275   this->mIMEHasQuit = true;
 276 }
 277
 278 void nsBaseWidget::DestroyCompositor() {
 279   // We release this before releasing the compositor, since it may hold the
 280   // last reference to our ClientLayerManager. ClientLayerManager's dtor can
 281   // trigger a paint, creating a new compositor, and we don't want to re-use
 282   // the old vsync dispatcher.
 283   if (mCompositorVsyncDispatcher) {
 284     MOZ_ASSERT(mCompositorVsyncDispatcherLock.get());
 285
 286     MutexAutoLock lock(*mCompositorVsyncDispatcherLock.get());
 287     mCompositorVsyncDispatcher->Shutdown();
 288     mCompositorVsyncDispatcher = nullptr;
 289   }
 290
 291   // The compositor shutdown sequence looks like this:
 292   //  1. CompositorSession calls CompositorBridgeChild::Destroy.
 293   //  2. CompositorBridgeChild synchronously sends WillClose.
 294   //  3. CompositorBridgeParent releases some resources (such as the layer
 295   //     manager, compositor, and widget).
 296   //  4. CompositorBridgeChild::Destroy returns.
 297   //  5. Asynchronously, CompositorBridgeParent::ActorDestroy will fire on the
 298   //     compositor thread when the I/O thread closes the IPC channel.
 299   //  6. Step 5 will schedule DeferredDestroy on the compositor thread, which
 300   //     releases the reference CompositorBridgeParent holds to itself.
 301   //
 302   // When CompositorSession::Shutdown returns, we assume the compositor is gone
 303   // or will be gone very soon.
 304   if (mCompositorSession) {
 305     ReleaseContentController();
 306     mAPZC = nullptr;
 307     SetCompositorWidgetDelegate(nullptr);
 308     mCompositorBridgeChild = nullptr;
 309
 310     // XXX CompositorBridgeChild and CompositorBridgeParent might be re-created
 311     // in ClientLayerManager destructor. See bug 1133426.
 312     RefPtr<CompositorSession> session = std::move(mCompositorSession);
 313     session->Shutdown();
 314   }
 315 }
 316
 317 // This prevents the layer manager from starting a new transaction during
 318 // shutdown.
 319 void nsBaseWidget::RevokeTransactionIdAllocator() {
 320   if (!mLayerManager) {
 321     return;
 322   }
 323   mLayerManager->SetTransactionIdAllocator(nullptr);
 324 }
 325
 326 void nsBaseWidget::ReleaseContentController() {
 327   if (mRootContentController) {
 328     mRootContentController->Destroy();
 329     mRootContentController = nullptr;
 330   }
 331 }
 332
 333 void nsBaseWidget::DestroyLayerManager() {
 334   if (mLayerManager) {
 335     mLayerManager->Destroy();
 336     mLayerManager = nullptr;
 337   }
 338   DestroyCompositor();
 339 }
 340
 341 void nsBaseWidget::OnRenderingDeviceReset() { DestroyLayerManager(); }
 342
 343 void nsBaseWidget::FreeShutdownObserver() {
 344   if (mShutdownObserver) {
 345     mShutdownObserver->Unregister();
 346   }
 347   mShutdownObserver = nullptr;
 348 }
 349
 350 //-------------------------------------------------------------------------
 351 //
 352 // nsBaseWidget destructor
 353 //
 354 //-------------------------------------------------------------------------
 355
 356 nsBaseWidget::~nsBaseWidget() {
 357   IMEStateManager::WidgetDestroyed(this);
 358
 359   if (mLayerManager) {
 360     if (BasicLayerManager* mgr = mLayerManager->AsBasicLayerManager()) {
 361       mgr->ClearRetainerWidget();
 362     }
 363   }
 364
 365   FreeShutdownObserver();
 366   RevokeTransactionIdAllocator();
 367   DestroyLayerManager();
 368
 369 #ifdef NOISY_WIDGET_LEAKS
 370   gNumWidgets--;
 371   printf("WIDGETS- = %d\n", gNumWidgets);
 372 #endif
 373
 374   delete mOriginalBounds;
 375 }
 376
 377 //-------------------------------------------------------------------------
 378 //
 379 // Basic create.
 380 //
 381 //-------------------------------------------------------------------------
 382 void nsBaseWidget::BaseCreate(nsIWidget* aParent, nsWidgetInitData* aInitData) {
 383   // keep a reference to the device context
 384   if (nullptr != aInitData) {
 385     mWindowType = aInitData->mWindowType;
 386     mBorderStyle = aInitData->mBorderStyle;
 387     mPopupLevel = aInitData->mPopupLevel;
 388     mPopupType = aInitData->mPopupHint;
 389     mHasRemoteContent = aInitData->mHasRemoteContent;
 390     mFissionWindow = aInitData->mFissionWindow;
 391   }
 392
 393   if (aParent) {
 394     aParent->AddChild(this);
 395   }
 396 }
 397
 398 //-------------------------------------------------------------------------
 399 //
 400 // Accessor functions to get/set the client data
 401 //
 402 //-------------------------------------------------------------------------
 403
 404 nsIWidgetListener* nsBaseWidget::GetWidgetListener() { return mWidgetListener; }
 405
 406 void nsBaseWidget::SetWidgetListener(nsIWidgetListener* aWidgetListener) {
 407   mWidgetListener = aWidgetListener;
 408 }
 409
 410 already_AddRefed<nsIWidget> nsBaseWidget::CreateChild(
 411     const LayoutDeviceIntRect& aRect, nsWidgetInitData* aInitData,
 412     bool aForceUseIWidgetParent) {
 413   nsIWidget* parent = this;
 414   nsNativeWidget nativeParent = nullptr;
 415
 416   if (!aForceUseIWidgetParent) {
 417     // Use only either parent or nativeParent, not both, to match
 418     // existing code.  Eventually Create() should be divested of its
 419     // nativeWidget parameter.
 420     nativeParent = parent ? parent->GetNativeData(NS_NATIVE_WIDGET) : nullptr;
 421     parent = nativeParent ? nullptr : parent;
 422     MOZ_ASSERT(!parent || !nativeParent, "messed up logic");
 423   }
 424
 425   nsCOMPtr<nsIWidget> widget;
 426   if (aInitData && aInitData->mWindowType == eWindowType_popup) {
 427     widget = AllocateChildPopupWidget();
 428   } else {
 429     widget = nsIWidget::CreateChildWindow();
 430   }
 431
 432   if (widget &&
 433       NS_SUCCEEDED(widget->Create(parent, nativeParent, aRect, aInitData))) {
 434     return widget.forget();
 435   }
 436
 437   return nullptr;
 438 }
 439
 440 // Attach a view to our widget which we'll send events to.
 441 void nsBaseWidget::AttachViewToTopLevel(bool aUseAttachedEvents) {
 442   NS_ASSERTION((mWindowType == eWindowType_toplevel ||
 443                 mWindowType == eWindowType_dialog ||
 444                 mWindowType == eWindowType_invisible ||
 445                 mWindowType == eWindowType_child),
 446                "Can't attach to window of that type");
 447
 448   mUseAttachedEvents = aUseAttachedEvents;
 449 }
 450
 451 nsIWidgetListener* nsBaseWidget::GetAttachedWidgetListener() {
 452   return mAttachedWidgetListener;
 453 }
 454
 455 nsIWidgetListener* nsBaseWidget::GetPreviouslyAttachedWidgetListener() {
 456   return mPreviouslyAttachedWidgetListener;
 457 }
 458
 459 void nsBaseWidget::SetPreviouslyAttachedWidgetListener(
 460     nsIWidgetListener* aListener) {
 461   mPreviouslyAttachedWidgetListener = aListener;
 462 }
 463
 464 void nsBaseWidget::SetAttachedWidgetListener(nsIWidgetListener* aListener) {
 465   mAttachedWidgetListener = aListener;
 466 }
 467
 468 //-------------------------------------------------------------------------
 469 //
 470 // Close this nsBaseWidget
 471 //
 472 //-------------------------------------------------------------------------
 473 void nsBaseWidget::Destroy() {
 474   // Just in case our parent is the only ref to us
 475   nsCOMPtr<nsIWidget> kungFuDeathGrip(this);
 476   // disconnect from the parent
 477   nsIWidget* parent = GetParent();
 478   if (parent) {
 479     parent->RemoveChild(this);
 480   }
 481
 482 #if defined(XP_WIN)
 483   // Allow our scroll capture container to be cleaned up, if we have one.
 484   mScrollCaptureContainer = nullptr;
 485 #endif
 486 }
 487
 488 //-------------------------------------------------------------------------
 489 //
 490 // Get this nsBaseWidget parent
 491 //
 492 //-------------------------------------------------------------------------
 493 nsIWidget* nsBaseWidget::GetParent(void) { return nullptr; }
 494
 495 //-------------------------------------------------------------------------
 496 //
 497 // Get this nsBaseWidget top level widget
 498 //
 499 //-------------------------------------------------------------------------
 500 nsIWidget* nsBaseWidget::GetTopLevelWidget() {
 501   nsIWidget *topLevelWidget = nullptr, *widget = this;
 502   while (widget) {
 503     topLevelWidget = widget;
 504     widget = widget->GetParent();
 505   }
 506   return topLevelWidget;
 507 }
 508
 509 //-------------------------------------------------------------------------
 510 //
 511 // Get this nsBaseWidget's top (non-sheet) parent (if it's a sheet)
 512 //
 513 //-------------------------------------------------------------------------
 514 nsIWidget* nsBaseWidget::GetSheetWindowParent(void) { return nullptr; }
 515
 516 float nsBaseWidget::GetDPI() { return 96.0f; }
 517
 518 CSSToLayoutDeviceScale nsIWidget::GetDefaultScale() {
 519   double devPixelsPerCSSPixel = StaticPrefs::layout_css_devPixelsPerPx();
 520
 521   if (devPixelsPerCSSPixel <= 0.0) {
 522     devPixelsPerCSSPixel = GetDefaultScaleInternal();
 523   }
 524
 525   return CSSToLayoutDeviceScale(devPixelsPerCSSPixel);
 526 }
 527
 528 //-------------------------------------------------------------------------
 529 //
 530 // Add a child to the list of children
 531 //
 532 //-------------------------------------------------------------------------
 533 void nsBaseWidget::AddChild(nsIWidget* aChild) {
 534   MOZ_ASSERT(!aChild->GetNextSibling() && !aChild->GetPrevSibling(),
 535              "aChild not properly removed from its old child list");
 536
 537   if (!mFirstChild) {
 538     mFirstChild = mLastChild = aChild;
 539   } else {
 540     // append to the list
 541     MOZ_ASSERT(mLastChild);
 542     MOZ_ASSERT(!mLastChild->GetNextSibling());
 543     mLastChild->SetNextSibling(aChild);
 544     aChild->SetPrevSibling(mLastChild);
 545     mLastChild = aChild;
 546   }
 547 }
 548
 549 //-------------------------------------------------------------------------
 550 //
 551 // Remove a child from the list of children
 552 //
 553 //-------------------------------------------------------------------------
 554 void nsBaseWidget::RemoveChild(nsIWidget* aChild) {
 555 #ifdef DEBUG
 556 #  ifdef XP_MACOSX
 557   // nsCocoaWindow doesn't implement GetParent, so in that case parent will be
 558   // null and we'll just have to do without this assertion.
 559   nsIWidget* parent = aChild->GetParent();
 560   NS_ASSERTION(!parent || parent == this, "Not one of our kids!");
 561 #  else
 562   MOZ_RELEASE_ASSERT(aChild->GetParent() == this, "Not one of our kids!");
 563 #  endif
 564 #endif
 565
 566   if (mLastChild == aChild) {
 567     mLastChild = mLastChild->GetPrevSibling();
 568   }
 569   if (mFirstChild == aChild) {
 570     mFirstChild = mFirstChild->GetNextSibling();
 571   }
 572
 573   // Now remove from the list.  Make sure that we pass ownership of the tail
 574   // of the list correctly before we have aChild let go of it.
 575   nsIWidget* prev = aChild->GetPrevSibling();
 576   nsIWidget* next = aChild->GetNextSibling();
 577   if (prev) {
 578     prev->SetNextSibling(next);
 579   }
 580   if (next) {
 581     next->SetPrevSibling(prev);
 582   }
 583
 584   aChild->SetNextSibling(nullptr);
 585   aChild->SetPrevSibling(nullptr);
 586 }
 587
 588 //-------------------------------------------------------------------------
 589 //
 590 // Sets widget's position within its parent's child list.
 591 //
 592 //-------------------------------------------------------------------------
 593 void nsBaseWidget::SetZIndex(int32_t aZIndex) {
 594   // Hold a ref to ourselves just in case, since we're going to remove
 595   // from our parent.
 596   nsCOMPtr<nsIWidget> kungFuDeathGrip(this);
 597
 598   mZIndex = aZIndex;
 599
 600   // reorder this child in its parent's list.
 601   auto* parent = static_cast<nsBaseWidget*>(GetParent());
 602   if (parent) {
 603     parent->RemoveChild(this);
 604     // Scope sib outside the for loop so we can check it afterward
 605     nsIWidget* sib = parent->GetFirstChild();
 606     for (; sib; sib = sib->GetNextSibling()) {
 607       int32_t childZIndex = GetZIndex();
 608       if (aZIndex < childZIndex) {
 609         // Insert ourselves before sib
 610         nsIWidget* prev = sib->GetPrevSibling();
 611         mNextSibling = sib;
 612         mPrevSibling = prev;
 613         sib->SetPrevSibling(this);
 614         if (prev) {
 615           prev->SetNextSibling(this);
 616         } else {
 617           NS_ASSERTION(sib == parent->mFirstChild, "Broken child list");
 618           // We've taken ownership of sib, so it's safe to have parent let
 619           // go of it
 620           parent->mFirstChild = this;
 621         }
 622         PlaceBehind(eZPlacementBelow, sib, false);
 623         break;
 624       }
 625     }
 626     // were we added to the list?
 627     if (!sib) {
 628       parent->AddChild(this);
 629     }
 630   }
 631 }
 632
 633 //-------------------------------------------------------------------------
 634 //
 635 // Maximize, minimize or restore the window. The BaseWidget implementation
 636 // merely stores the state.
 637 //
 638 //-------------------------------------------------------------------------
 639 void nsBaseWidget::SetSizeMode(nsSizeMode aMode) {
 640   MOZ_ASSERT(aMode == nsSizeMode_Normal || aMode == nsSizeMode_Minimized ||
 641              aMode == nsSizeMode_Maximized || aMode == nsSizeMode_Fullscreen);
 642   mSizeMode = aMode;
 643 }
 644
 645 void nsBaseWidget::GetWorkspaceID(nsAString& workspaceID) {
 646   workspaceID.Truncate();
 647 }
 648
 649 void nsBaseWidget::MoveToWorkspace(const nsAString& workspaceID) {
 650   // Noop.
 651 }
 652
 653 //-------------------------------------------------------------------------
 654 //
 655 // Get this component cursor
 656 //
 657 //-------------------------------------------------------------------------
 658
 659 void nsBaseWidget::SetCursor(nsCursor aCursor, imgIContainer*, uint32_t,
 660                              uint32_t) {
 661   // We don't support the cursor image.
 662   mCursor = aCursor;
 663 }
 664
 665 //-------------------------------------------------------------------------
 666 //
 667 // Window transparency methods
 668 //
 669 //-------------------------------------------------------------------------
 670
 671 void nsBaseWidget::SetTransparencyMode(nsTransparencyMode aMode) {}
 672
 673 nsTransparencyMode nsBaseWidget::GetTransparencyMode() {
 674   return eTransparencyOpaque;
 675 }
 676
 677 bool nsBaseWidget::IsWindowClipRegionEqual(
 678     const nsTArray<LayoutDeviceIntRect>& aRects) {
 679   return mClipRects && mClipRectCount == aRects.Length() &&
 680          memcmp(mClipRects.get(), aRects.Elements(),
 681                 sizeof(LayoutDeviceIntRect) * mClipRectCount) == 0;
 682 }
 683
 684 void nsBaseWidget::StoreWindowClipRegion(
 685     const nsTArray<LayoutDeviceIntRect>& aRects) {
 686   mClipRectCount = aRects.Length();
 687   mClipRects = MakeUnique<LayoutDeviceIntRect[]>(mClipRectCount);
 688   if (mClipRects) {
 689     memcpy(mClipRects.get(), aRects.Elements(),
 690            sizeof(LayoutDeviceIntRect) * mClipRectCount);
 691   }
 692 }
 693
 694 void nsBaseWidget::GetWindowClipRegion(nsTArray<LayoutDeviceIntRect>* aRects) {
 695   if (mClipRects) {
 696     aRects->AppendElements(mClipRects.get(), mClipRectCount);
 697   } else {
 698     aRects->AppendElement(
 699         LayoutDeviceIntRect(0, 0, mBounds.Width(), mBounds.Height()));
 700   }
 701 }
 702
 703 const LayoutDeviceIntRegion nsBaseWidget::RegionFromArray(
 704     const nsTArray<LayoutDeviceIntRect>& aRects) {
 705   LayoutDeviceIntRegion region;
 706   for (uint32_t i = 0; i < aRects.Length(); ++i) {
 707     region.Or(region, aRects[i]);
 708   }
 709   return region;
 710 }
 711
 712 void nsBaseWidget::ArrayFromRegion(const LayoutDeviceIntRegion& aRegion,
 713                                    nsTArray<LayoutDeviceIntRect>& aRects) {
 714   for (auto iter = aRegion.RectIter(); !iter.Done(); iter.Next()) {
 715     aRects.AppendElement(iter.Get());
 716   }
 717 }
 718
 719 nsresult nsBaseWidget::SetWindowClipRegion(
 720     const nsTArray<LayoutDeviceIntRect>& aRects, bool aIntersectWithExisting) {
 721   if (!aIntersectWithExisting) {
 722     StoreWindowClipRegion(aRects);
 723   } else {
 724     // get current rects
 725     nsTArray<LayoutDeviceIntRect> currentRects;
 726     GetWindowClipRegion(&currentRects);
 727     // create region from them
 728     LayoutDeviceIntRegion currentRegion = RegionFromArray(currentRects);
 729     // create region from new rects
 730     LayoutDeviceIntRegion newRegion = RegionFromArray(aRects);
 731     // intersect regions
 732     LayoutDeviceIntRegion intersection;
 733     intersection.And(currentRegion, newRegion);
 734     // create int rect array from intersection
 735     nsTArray<LayoutDeviceIntRect> rects;
 736     ArrayFromRegion(intersection, rects);
 737     // store
 738     StoreWindowClipRegion(rects);
 739   }
 740   return NS_OK;
 741 }
 742
 743 /* virtual */
 744 void nsBaseWidget::PerformFullscreenTransition(FullscreenTransitionStage aStage,
 745                                                uint16_t aDuration,
 746                                                nsISupports* aData,
 747                                                nsIRunnable* aCallback) {
 748   MOZ_ASSERT_UNREACHABLE(
 749       "Should never call PerformFullscreenTransition on nsBaseWidget");
 750 }
 751
 752 //-------------------------------------------------------------------------
 753 //
 754 // Put the window into full-screen mode
 755 //
 756 //-------------------------------------------------------------------------
 757 void nsBaseWidget::InfallibleMakeFullScreen(bool aFullScreen,
 758                                             nsIScreen* aScreen) {
 759   HideWindowChrome(aFullScreen);
 760
 761   if (aFullScreen) {
 762     if (!mOriginalBounds) {
 763       mOriginalBounds = new LayoutDeviceIntRect();
 764     }
 765     *mOriginalBounds = GetScreenBounds();
 766
 767     // Move to top-left corner of screen and size to the screen dimensions
 768     nsCOMPtr<nsIScreen> screen = aScreen;
 769     if (!screen) {
 770       screen = GetWidgetScreen();
 771     }
 772     if (screen) {
 773       int32_t left, top, width, height;
 774       if (NS_SUCCEEDED(
 775               screen->GetRectDisplayPix(&left, &top, &width, &height))) {
 776         Resize(left, top, width, height, true);
 777       }
 778     }
 779   } else if (mOriginalBounds) {
 780     if (BoundsUseDesktopPixels()) {
 781       DesktopRect deskRect = *mOriginalBounds / GetDesktopToDeviceScale();
 782       Resize(deskRect.X(), deskRect.Y(), deskRect.Width(), deskRect.Height(),
 783              true);
 784     } else {
 785       Resize(mOriginalBounds->X(), mOriginalBounds->Y(),
 786              mOriginalBounds->Width(), mOriginalBounds->Height(), true);
 787     }
 788   }
 789 }
 790
 791 nsresult nsBaseWidget::MakeFullScreen(bool aFullScreen, nsIScreen* aScreen) {
 792   InfallibleMakeFullScreen(aFullScreen, aScreen);
 793   return NS_OK;
 794 }
 795
 796 nsBaseWidget::AutoLayerManagerSetup::AutoLayerManagerSetup(
 797     nsBaseWidget* aWidget, gfxContext* aTarget, BufferMode aDoubleBuffering,
 798     ScreenRotation aRotation)
 799     : mWidget(aWidget) {
 800   LayerManager* lm = mWidget->GetLayerManager();
 801   NS_ASSERTION(
 802       !lm || lm->GetBackendType() == LayersBackend::LAYERS_BASIC,
 803       "AutoLayerManagerSetup instantiated for non-basic layer backend!");
 804   if (lm) {
 805     mLayerManager = lm->AsBasicLayerManager();
 806     if (mLayerManager) {
 807       mLayerManager->SetDefaultTarget(aTarget);
 808       mLayerManager->SetDefaultTargetConfiguration(aDoubleBuffering, aRotation);
 809     }
 810   }
 811 }
 812
 813 nsBaseWidget::AutoLayerManagerSetup::~AutoLayerManagerSetup() {
 814   if (mLayerManager) {
 815     mLayerManager->SetDefaultTarget(nullptr);
 816     mLayerManager->SetDefaultTargetConfiguration(
 817         mozilla::layers::BufferMode::BUFFER_NONE, ROTATION_0);
 818   }
 819 }
 820
 821 bool nsBaseWidget::IsSmallPopup() const {
 822   return mWindowType == eWindowType_popup && mPopupType != ePopupTypePanel;
 823 }
 824
 825 bool nsBaseWidget::ComputeShouldAccelerate() {
 826   return gfx::gfxConfig::IsEnabled(gfx::Feature::HW_COMPOSITING) &&
 827          WidgetTypeSupportsAcceleration();
 828 }
 829
 830 bool nsBaseWidget::WidgetTypePrefersSoftwareWebRender() const {
 831   return StaticPrefs::gfx_webrender_software_unaccelerated_widget_force();
 832 }
 833
 834 bool nsBaseWidget::UseAPZ() {
 835   return (gfxPlatform::AsyncPanZoomEnabled() &&
 836           (WindowType() == eWindowType_toplevel ||
 837            WindowType() == eWindowType_child ||
 838            (WindowType() == eWindowType_popup && HasRemoteContent() &&
 839             StaticPrefs::apz_popups_enabled())));
 840 }
 841
 842 void nsBaseWidget::CreateCompositor() {
 843   LayoutDeviceIntRect rect = GetBounds();
 844   CreateCompositor(rect.Width(), rect.Height());
 845 }
 846
 847 already_AddRefed<GeckoContentController>
 848 nsBaseWidget::CreateRootContentController() {
 849   RefPtr<GeckoContentController> controller =
 850       new ChromeProcessController(this, mAPZEventState, mAPZC);
 851   return controller.forget();
 852 }
 853
 854 void nsBaseWidget::ConfigureAPZCTreeManager() {
 855   MOZ_ASSERT(NS_IsMainThread());
 856   MOZ_ASSERT(mAPZC);
 857
 858   ConfigureAPZControllerThread();
 859
 860   float dpi = GetDPI();
 861   // On Android the main thread is not the controller thread
 862   APZThreadUtils::RunOnControllerThread(
 863       NewRunnableMethod<float>("layers::IAPZCTreeManager::SetDPI", mAPZC,
 864                                &IAPZCTreeManager::SetDPI, dpi));
 865
 866   if (StaticPrefs::apz_keyboard_enabled_AtStartup()) {
 867     KeyboardMap map = RootWindowGlobalKeyListener::CollectKeyboardShortcuts();
 868     // On Android the main thread is not the controller thread
 869     APZThreadUtils::RunOnControllerThread(NewRunnableMethod<KeyboardMap>(
 870         "layers::IAPZCTreeManager::SetKeyboardMap", mAPZC,
 871         &IAPZCTreeManager::SetKeyboardMap, map));
 872   }
 873
 874   RefPtr<IAPZCTreeManager> treeManager = mAPZC;  // for capture by the lambdas
 875
 876   ContentReceivedInputBlockCallback callback(
 877       [treeManager](uint64_t aInputBlockId, bool aPreventDefault) {
 878         MOZ_ASSERT(NS_IsMainThread());
 879         APZThreadUtils::RunOnControllerThread(NewRunnableMethod<uint64_t, bool>(
 880             "layers::IAPZCTreeManager::ContentReceivedInputBlock", treeManager,
 881             &IAPZCTreeManager::ContentReceivedInputBlock, aInputBlockId,
 882             aPreventDefault));
 883       });
 884   mAPZEventState = new APZEventState(this, std::move(callback));
 885
 886   mSetAllowedTouchBehaviorCallback =
 887       [treeManager](uint64_t aInputBlockId,
 888                     const nsTArray<TouchBehaviorFlags>& aFlags) {
 889         MOZ_ASSERT(NS_IsMainThread());
 890         APZThreadUtils::RunOnControllerThread(
 891             NewRunnableMethod<
 892                 uint64_t, StoreCopyPassByLRef<nsTArray<TouchBehaviorFlags>>>(
 893                 "layers::IAPZCTreeManager::SetAllowedTouchBehavior",
 894                 treeManager, &IAPZCTreeManager::SetAllowedTouchBehavior,
 895                 aInputBlockId, aFlags.Clone()));
 896       };
 897
 898   mRootContentController = CreateRootContentController();
 899   if (mRootContentController) {
 900     mCompositorSession->SetContentController(mRootContentController);
 901   }
 902
 903   // When APZ is enabled, we can actually enable raw touch events because we
 904   // have code that can deal with them properly. If APZ is not enabled, this
 905   // function doesn't get called.
 906   if (StaticPrefs::dom_w3c_touch_events_enabled()) {
 907     RegisterTouchWindow();
 908   }
 909 }
 910
 911 void nsBaseWidget::ConfigureAPZControllerThread() {
 912   // By default the controller thread is the main thread.
 913   APZThreadUtils::SetControllerThread(NS_GetCurrentThread());
 914 }
 915
 916 void nsBaseWidget::SetConfirmedTargetAPZC(
 917     uint64_t aInputBlockId,
 918     const nsTArray<ScrollableLayerGuid>& aTargets) const {
 919   APZThreadUtils::RunOnControllerThread(
 920       NewRunnableMethod<uint64_t,
 921                         StoreCopyPassByRRef<nsTArray<ScrollableLayerGuid>>>(
 922           "layers::IAPZCTreeManager::SetTargetAPZC", mAPZC,
 923           &IAPZCTreeManager::SetTargetAPZC, aInputBlockId, aTargets.Clone()));
 924 }
 925
 926 void nsBaseWidget::UpdateZoomConstraints(
 927     const uint32_t& aPresShellId, const ScrollableLayerGuid::ViewID& aViewId,
 928     const Maybe<ZoomConstraints>& aConstraints) {
 929   if (!mCompositorSession || !mAPZC) {
 930     if (mInitialZoomConstraints) {
 931       MOZ_ASSERT(mInitialZoomConstraints->mPresShellID == aPresShellId);
 932       MOZ_ASSERT(mInitialZoomConstraints->mViewID == aViewId);
 933       if (!aConstraints) {
 934         mInitialZoomConstraints.reset();
 935       }
 936     }
 937
 938     if (aConstraints) {
 939       // We have some constraints, but the compositor and APZC aren't created
 940       // yet. Save these so we can use them later.
 941       mInitialZoomConstraints = Some(
 942           InitialZoomConstraints(aPresShellId, aViewId, aConstraints.ref()));
 943     }
 944     return;
 945   }
 946   LayersId layersId = mCompositorSession->RootLayerTreeId();
 947   mAPZC->UpdateZoomConstraints(
 948       ScrollableLayerGuid(layersId, aPresShellId, aViewId), aConstraints);
 949 }
 950
 951 bool nsBaseWidget::AsyncPanZoomEnabled() const { return !!mAPZC; }
 952
 953 nsEventStatus nsBaseWidget::ProcessUntransformedAPZEvent(
 954     WidgetInputEvent* aEvent, const APZEventResult& aApzResult) {
 955   MOZ_ASSERT(NS_IsMainThread());
 956   ScrollableLayerGuid targetGuid = aApzResult.mTargetGuid;
 957   uint64_t inputBlockId = aApzResult.mInputBlockId;
 958   InputAPZContext context(aApzResult.mTargetGuid, inputBlockId,
 959                           aApzResult.GetStatus());
 960
 961   // Make a copy of the original event for the APZCCallbackHelper helpers that
 962   // we call later, because the event passed to DispatchEvent can get mutated in
 963   // ways that we don't want (i.e. touch points can get stripped out).
 964   nsEventStatus status;
 965   UniquePtr<WidgetEvent> original(aEvent->Duplicate());
 966   DispatchEvent(aEvent, status);
 967
 968   if (mAPZC && !InputAPZContext::WasRoutedToChildProcess() && inputBlockId) {
 969     // EventStateManager did not route the event into the child process.
 970     // It's safe to communicate to APZ that the event has been processed.
 971     // Note that here aGuid.mLayersId might be different from
 972     // mCompositorSession->RootLayerTreeId() because the event might have gotten
 973     // hit-tested by APZ to be targeted at a child process, but a parent process
 974     // event listener called preventDefault on it. In that case aGuid.mLayersId
 975     // would still be the layers id for the child process, but the event would
 976     // not have actually gotten routed to the child process. The main-thread
 977     // hit-test result therefore needs to use the parent process layers id.
 978     LayersId rootLayersId = mCompositorSession->RootLayerTreeId();
 979
 980     UniquePtr<DisplayportSetListener> postLayerization;
 981     if (WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent()) {
 982       nsTArray<TouchBehaviorFlags> allowedTouchBehaviors;
 983       if (touchEvent->mMessage == eTouchStart) {
 984         if (StaticPrefs::layout_css_touch_action_enabled()) {
 985           allowedTouchBehaviors =
 986               APZCCallbackHelper::SendSetAllowedTouchBehaviorNotification(
 987                   this, GetDocument(), *(original->AsTouchEvent()),
 988                   inputBlockId, mSetAllowedTouchBehaviorCallback);
 989         }
 990         postLayerization = APZCCallbackHelper::SendSetTargetAPZCNotification(
 991             this, GetDocument(), *(original->AsTouchEvent()), rootLayersId,
 992             inputBlockId);
 993       }
 994       mAPZEventState->ProcessTouchEvent(*touchEvent, targetGuid, inputBlockId,
 995                                         aApzResult.GetStatus(), status,
 996                                         std::move(allowedTouchBehaviors));
 997     } else if (WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent()) {
 998       MOZ_ASSERT(wheelEvent->mFlags.mHandledByAPZ);
 999       postLayerization = APZCCallbackHelper::SendSetTargetAPZCNotification(
1000           this, GetDocument(), *(original->AsWheelEvent()), rootLayersId,
1001           inputBlockId);
1002       if (wheelEvent->mCanTriggerSwipe) {
1003         ReportSwipeStarted(inputBlockId, wheelEvent->TriggersSwipe());
1004       }
1005       mAPZEventState->ProcessWheelEvent(*wheelEvent, inputBlockId);
1006     } else if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
1007       MOZ_ASSERT(mouseEvent->mFlags.mHandledByAPZ);
1008       postLayerization = APZCCallbackHelper::SendSetTargetAPZCNotification(
1009           this, GetDocument(), *(original->AsMouseEvent()), rootLayersId,
1010           inputBlockId);
1011       mAPZEventState->ProcessMouseEvent(*mouseEvent, inputBlockId);
1012     }
1013     if (postLayerization && postLayerization->Register()) {
1014       Unused << postLayerization.release();
1015     }
1016   }
1017
1018   return status;
1019 }
1020
1021 template <class InputType, class EventType>
1022 class DispatchEventOnMainThread : public Runnable {
1023  public:
1024   DispatchEventOnMainThread(const InputType& aInput, nsBaseWidget* aWidget,
1025                             const APZEventResult& aAPZResult)
1026       : mozilla::Runnable("DispatchEventOnMainThread"),
1027         mInput(aInput),
1028         mWidget(aWidget),
1029         mAPZResult(aAPZResult) {}
1030
1031   NS_IMETHOD Run() override {
1032     EventType event = mInput.ToWidgetEvent(mWidget);
1033     mWidget->ProcessUntransformedAPZEvent(&event, mAPZResult);
1034     return NS_OK;
1035   }
1036
1037  private:
1038   InputType mInput;
1039   nsBaseWidget* mWidget;
1040   APZEventResult mAPZResult;
1041 };
1042
1043 template <class InputType, class EventType>
1044 class DispatchInputOnControllerThread : public Runnable {
1045  public:
1046   DispatchInputOnControllerThread(const EventType& aEvent,
1047                                   IAPZCTreeManager* aAPZC,
1048                                   nsBaseWidget* aWidget)
1049       : mozilla::Runnable("DispatchInputOnControllerThread"),
1050         mMainMessageLoop(MessageLoop::current()),
1051         mInput(aEvent),
1052         mAPZC(aAPZC),
1053         mWidget(aWidget) {}
1054
1055   NS_IMETHOD Run() override {
1056     APZEventResult result = mAPZC->InputBridge()->ReceiveInputEvent(mInput);
1057     if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
1058       return NS_OK;
1059     }
1060     RefPtr<Runnable> r = new DispatchEventOnMainThread<InputType, EventType>(
1061         mInput, mWidget, result);
1062     mMainMessageLoop->PostTask(r.forget());
1063     return NS_OK;
1064   }
1065
1066  private:
1067   MessageLoop* mMainMessageLoop;
1068   InputType mInput;
1069   RefPtr<IAPZCTreeManager> mAPZC;
1070   nsBaseWidget* mWidget;
1071 };
1072
1073 void nsBaseWidget::DispatchTouchInput(MultiTouchInput& aInput) {
1074   MOZ_ASSERT(NS_IsMainThread());
1075   if (mAPZC) {
1076     MOZ_ASSERT(APZThreadUtils::IsControllerThread());
1077
1078     APZEventResult result = mAPZC->InputBridge()->ReceiveInputEvent(aInput);
1079     if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
1080       return;
1081     }
1082
1083     WidgetTouchEvent event = aInput.ToWidgetTouchEvent(this);
1084     ProcessUntransformedAPZEvent(&event, result);
1085   } else {
1086     WidgetTouchEvent event = aInput.ToWidgetTouchEvent(this);
1087
1088     nsEventStatus status;
1089     DispatchEvent(&event, status);
1090   }
1091 }
1092
1093 void nsBaseWidget::DispatchPanGestureInput(PanGestureInput& aInput) {
1094   MOZ_ASSERT(NS_IsMainThread());
1095   if (mAPZC) {
1096     MOZ_ASSERT(APZThreadUtils::IsControllerThread());
1097
1098     APZEventResult result = mAPZC->InputBridge()->ReceiveInputEvent(aInput);
1099     if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
1100       return;
1101     }
1102
1103     WidgetWheelEvent event = aInput.ToWidgetEvent(this);
1104     ProcessUntransformedAPZEvent(&event, result);
1105   } else {
1106     WidgetWheelEvent event = aInput.ToWidgetEvent(this);
1107     nsEventStatus status;
1108     DispatchEvent(&event, status);
1109   }
1110 }
1111
1112 void nsBaseWidget::DispatchPinchGestureInput(PinchGestureInput& aInput) {
1113   MOZ_ASSERT(NS_IsMainThread());
1114   if (mAPZC) {
1115     MOZ_ASSERT(APZThreadUtils::IsControllerThread());
1116     APZEventResult result = mAPZC->InputBridge()->ReceiveInputEvent(aInput);
1117
1118     if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
1119       return;
1120     }
1121     WidgetWheelEvent event = aInput.ToWidgetEvent(this);
1122     ProcessUntransformedAPZEvent(&event, result);
1123   } else {
1124     WidgetWheelEvent event = aInput.ToWidgetEvent(this);
1125     nsEventStatus status;
1126     DispatchEvent(&event, status);
1127   }
1128 }
1129
1130 nsEventStatus nsBaseWidget::DispatchInputEvent(WidgetInputEvent* aEvent) {
1131   MOZ_ASSERT(NS_IsMainThread());
1132   if (mAPZC) {
1133     if (APZThreadUtils::IsControllerThread()) {
1134       APZEventResult result = mAPZC->InputBridge()->ReceiveInputEvent(*aEvent);
1135       if (result.GetStatus() == nsEventStatus_eConsumeNoDefault) {
1136         return result.GetStatus();
1137       }
1138       return ProcessUntransformedAPZEvent(aEvent, result);
1139     }
1140     if (WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent()) {
1141       RefPtr<Runnable> r =
1142           new DispatchInputOnControllerThread<ScrollWheelInput,
1143                                               WidgetWheelEvent>(*wheelEvent,
1144                                                                 mAPZC, this);
1145       APZThreadUtils::RunOnControllerThread(std::move(r));
1146       return nsEventStatus_eConsumeDoDefault;
1147     }
1148     if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
1149       RefPtr<Runnable> r =
1150           new DispatchInputOnControllerThread<MouseInput, WidgetMouseEvent>(
1151               *mouseEvent, mAPZC, this);
1152       APZThreadUtils::RunOnControllerThread(std::move(r));
1153       return nsEventStatus_eConsumeDoDefault;
1154     }
1155     // Allow dispatching keyboard events on Gecko thread.
1156     MOZ_ASSERT(aEvent->AsKeyboardEvent());
1157   }
1158
1159   nsEventStatus status;
1160   DispatchEvent(aEvent, status);
1161   return status;
1162 }
1163
1164 void nsBaseWidget::DispatchEventToAPZOnly(mozilla::WidgetInputEvent* aEvent) {
1165   MOZ_ASSERT(NS_IsMainThread());
1166   if (mAPZC) {
1167     MOZ_ASSERT(APZThreadUtils::IsControllerThread());
1168     mAPZC->InputBridge()->ReceiveInputEvent(*aEvent);
1169   }
1170 }
1171
1172 Document* nsBaseWidget::GetDocument() const {
1173   if (mWidgetListener) {
1174     if (PresShell* presShell = mWidgetListener->GetPresShell()) {
1175       return presShell->GetDocument();
1176     }
1177   }
1178   return nullptr;
1179 }
1180
1181 void nsBaseWidget::CreateCompositorVsyncDispatcher() {
1182   // Parent directly listens to the vsync source whereas
1183   // child process communicate via IPC
1184   // Should be called AFTER gfxPlatform is initialized
1185   if (XRE_IsParentProcess()) {
1186     if (!mCompositorVsyncDispatcherLock) {
1187       mCompositorVsyncDispatcherLock =
1188           MakeUnique<Mutex>("mCompositorVsyncDispatcherLock");
1189     }
1190     MutexAutoLock lock(*mCompositorVsyncDispatcherLock.get());
1191     if (!mCompositorVsyncDispatcher) {
1192       mCompositorVsyncDispatcher = new CompositorVsyncDispatcher();
1193     }
1194   }
1195 }
1196
1197 already_AddRefed<CompositorVsyncDispatcher>
1198 nsBaseWidget::GetCompositorVsyncDispatcher() {
1199   MOZ_ASSERT(mCompositorVsyncDispatcherLock.get());
1200
1201   MutexAutoLock lock(*mCompositorVsyncDispatcherLock.get());
1202   RefPtr<CompositorVsyncDispatcher> dispatcher = mCompositorVsyncDispatcher;
1203   return dispatcher.forget();
1204 }
1205
1206 already_AddRefed<LayerManager> nsBaseWidget::CreateCompositorSession(
1207     int aWidth, int aHeight, CompositorOptions* aOptionsOut) {
1208   MOZ_ASSERT(aOptionsOut);
1209
1210   do {
1211     CreateCompositorVsyncDispatcher();
1212
1213     gfx::GPUProcessManager* gpu = gfx::GPUProcessManager::Get();
1214     // Make sure GPU process is ready for use.
1215     // If it failed to connect to GPU process, GPU process usage is disabled in
1216     // EnsureGPUReady(). It could update gfxVars and gfxConfigs.
1217     gpu->EnsureGPUReady();
1218
1219     // If widget type does not supports acceleration, we may be allowed to use
1220     // software WebRender instead. If not, then we use ClientLayerManager even
1221     // when gfxVars::UseWebRender() is true. WebRender could coexist only with
1222     // BasicCompositor.
1223     bool supportsAcceleration = WidgetTypeSupportsAcceleration();
1224     bool enableWR;
1225     bool enableSWWR;
1226     if (supportsAcceleration ||
1227         StaticPrefs::gfx_webrender_unaccelerated_widget_force()) {
1228       enableWR = gfx::gfxVars::UseWebRender();
1229       enableSWWR = gfx::gfxVars::UseSoftwareWebRender();
1230     } else if (WidgetTypePrefersSoftwareWebRender()) {
1231       enableWR = enableSWWR = gfx::gfxVars::UseWebRender();
1232     } else {
1233       enableWR = enableSWWR = false;
1234     }
1235     bool enableAPZ = UseAPZ();
1236     CompositorOptions options(enableAPZ, enableWR, enableSWWR);
1237
1238 #ifdef XP_WIN
1239     if (supportsAcceleration) {
1240       options.SetAllowSoftwareWebRenderD3D11(
1241           gfx::gfxVars::AllowSoftwareWebRenderD3D11());
1242     }
1243 #elif defined(MOZ_WIDGET_ANDROID)
1244     MOZ_ASSERT(supportsAcceleration);
1245     options.SetAllowSoftwareWebRenderOGL(
1246         StaticPrefs::gfx_webrender_software_opengl_AtStartup());
1247 #elif defined(MOZ_WIDGET_GTK)
1248     if (supportsAcceleration) {
1249       options.SetAllowSoftwareWebRenderOGL(
1250           StaticPrefs::gfx_webrender_software_opengl_AtStartup());
1251     }
1252 #endif
1253
1254 #ifdef MOZ_WIDGET_ANDROID
1255     if (!GetNativeData(NS_JAVA_SURFACE)) {
1256       options.SetInitiallyPaused(true);
1257     }
1258 #else
1259     options.SetInitiallyPaused(CompositorInitiallyPaused());
1260 #endif
1261
1262     RefPtr<LayerManager> lm;
1263     if (options.UseWebRender()) {
1264       lm = new WebRenderLayerManager(this);
1265     } else {
1266       lm = new ClientLayerManager(this);
1267     }
1268
1269     bool retry = false;
1270     mCompositorSession = gpu->CreateTopLevelCompositor(
1271         this, lm, GetDefaultScale(), options, UseExternalCompositingSurface(),
1272         gfx::IntSize(aWidth, aHeight), &retry);
1273
1274     if (lm->AsWebRenderLayerManager() && mCompositorSession) {
1275       TextureFactoryIdentifier textureFactoryIdentifier;
1276       nsCString error;
1277       lm->AsWebRenderLayerManager()->Initialize(
1278           mCompositorSession->GetCompositorBridgeChild(),
1279           wr::AsPipelineId(mCompositorSession->RootLayerTreeId()),
1280           &textureFactoryIdentifier, error);
1281       if (textureFactoryIdentifier.mParentBackend != LayersBackend::LAYERS_WR) {
1282         retry = true;
1283         DestroyCompositor();
1284         // gfxVars::UseDoubleBufferingWithCompositor() is also disabled.
1285         gfx::GPUProcessManager::Get()->DisableWebRender(
1286             wr::WebRenderError::INITIALIZE, error);
1287       }
1288     } else if (lm->AsClientLayerManager() && mCompositorSession) {
1289       bool shouldAccelerate = ComputeShouldAccelerate();
1290       TextureFactoryIdentifier textureFactoryIdentifier;
1291       lm->AsClientLayerManager()->Initialize(
1292           mCompositorSession->GetCompositorBridgeChild(), shouldAccelerate,
1293           &textureFactoryIdentifier);
1294       if (textureFactoryIdentifier.mParentBackend ==
1295           LayersBackend::LAYERS_NONE) {
1296         DestroyCompositor();
1297         lm = nullptr;
1298       }
1299     }
1300
1301     // We need to retry in a loop because the act of failing to create the
1302     // compositor can change our state (e.g. disable WebRender).
1303     if (mCompositorSession || !retry) {
1304       *aOptionsOut = options;
1305       return lm.forget();
1306     }
1307   } while (true);
1308 }
1309
1310 void nsBaseWidget::CreateCompositor(int aWidth, int aHeight) {
1311   // This makes sure that gfxPlatforms gets initialized if it hasn't by now.
1312   gfxPlatform::GetPlatform();
1313
1314   MOZ_ASSERT(gfxPlatform::UsesOffMainThreadCompositing(),
1315              "This function assumes OMTC");
1316
1317   MOZ_ASSERT(!mCompositorSession && !mCompositorBridgeChild,
1318              "Should have properly cleaned up the previous PCompositor pair "
1319              "beforehand");
1320
1321   if (mCompositorBridgeChild) {
1322     mCompositorBridgeChild->Destroy();
1323   }
1324
1325   // Recreating this is tricky, as we may still have an old and we need
1326   // to make sure it's properly destroyed by calling DestroyCompositor!
1327
1328   // If we've already received a shutdown notification, don't try
1329   // create a new compositor.
1330   if (!mShutdownObserver) {
1331     return;
1332   }
1333
1334   CompositorOptions options;
1335   RefPtr<LayerManager> lm = CreateCompositorSession(aWidth, aHeight, &options);
1336   if (!lm) {
1337     return;
1338   }
1339
1340   MOZ_ASSERT(mCompositorSession);
1341   mCompositorBridgeChild = mCompositorSession->GetCompositorBridgeChild();
1342   SetCompositorWidgetDelegate(
1343       mCompositorSession->GetCompositorWidgetDelegate());
1344
1345   if (options.UseAPZ()) {
1346     mAPZC = mCompositorSession->GetAPZCTreeManager();
1347     ConfigureAPZCTreeManager();
1348   } else {
1349     mAPZC = nullptr;
1350   }
1351
1352   if (mInitialZoomConstraints) {
1353     UpdateZoomConstraints(mInitialZoomConstraints->mPresShellID,
1354                           mInitialZoomConstraints->mViewID,
1355                           Some(mInitialZoomConstraints->mConstraints));
1356     mInitialZoomConstraints.reset();
1357   }
1358
1359   if (lm->AsWebRenderLayerManager()) {
1360     TextureFactoryIdentifier textureFactoryIdentifier =
1361         lm->GetTextureFactoryIdentifier();
1362     MOZ_ASSERT(textureFactoryIdentifier.mParentBackend ==
1363                LayersBackend::LAYERS_WR);
1364     ImageBridgeChild::IdentifyCompositorTextureHost(textureFactoryIdentifier);
1365     gfx::VRManagerChild::IdentifyTextureHost(textureFactoryIdentifier);
1366   } else if (lm->AsClientLayerManager()) {
1367     TextureFactoryIdentifier textureFactoryIdentifier =
1368         lm->GetTextureFactoryIdentifier();
1369     // Some popup or transparent widgets may use a different backend than the
1370     // compositors used with ImageBridge and VR (and more generally web
1371     // content).
1372     if (WidgetTypeSupportsAcceleration()) {
1373       ImageBridgeChild::IdentifyCompositorTextureHost(textureFactoryIdentifier);
1374       gfx::VRManagerChild::IdentifyTextureHost(textureFactoryIdentifier);
1375     }
1376   }
1377
1378   WindowUsesOMTC();
1379
1380   mLayerManager = std::move(lm);
1381
1382   // Only track compositors for top-level windows, since other window types
1383   // may use the basic compositor.  Except on the OS X - see bug 1306383
1384 #if defined(XP_MACOSX)
1385   bool getCompositorFromThisWindow = true;
1386 #else
1387   bool getCompositorFromThisWindow = (mWindowType == eWindowType_toplevel);
1388 #endif
1389
1390   if (getCompositorFromThisWindow) {
1391     gfxPlatform::GetPlatform()->NotifyCompositorCreated(
1392         mLayerManager->GetCompositorBackendType());
1393   }
1394 }
1395
1396 void nsBaseWidget::NotifyCompositorSessionLost(CompositorSession* aSession) {
1397   MOZ_ASSERT(aSession == mCompositorSession);
1398   DestroyLayerManager();
1399 }
1400
1401 bool nsBaseWidget::ShouldUseOffMainThreadCompositing() {
1402   return gfxPlatform::UsesOffMainThreadCompositing();
1403 }
1404
1405 LayerManager* nsBaseWidget::GetLayerManager(
1406     PLayerTransactionChild* aShadowManager, LayersBackend aBackendHint,
1407     LayerManagerPersistence aPersistence) {
1408   if (!mLayerManager) {
1409     if (!mShutdownObserver) {
1410       // We are shutting down, do not try to re-create a LayerManager
1411       return nullptr;
1412     }
1413     // Try to use an async compositor first, if possible
1414     if (ShouldUseOffMainThreadCompositing()) {
1415       // e10s uses the parameter to pass in the shadow manager from the
1416       // BrowserChild so we don't expect to see it there since this doesn't
1417       // support e10s.
1418       NS_ASSERTION(aShadowManager == nullptr,
1419                    "Async Compositor not supported with e10s");
1420       CreateCompositor();
1421     }
1422
1423     if (!mLayerManager) {
1424       mLayerManager = CreateBasicLayerManager();
1425     }
1426   }
1427   return mLayerManager;
1428 }
1429
1430 LayerManager* nsBaseWidget::CreateBasicLayerManager() {
1431   return new BasicLayerManager(this);
1432 }
1433
1434 CompositorBridgeChild* nsBaseWidget::GetRemoteRenderer() {
1435   return mCompositorBridgeChild;
1436 }
1437
1438 void nsBaseWidget::ClearCachedWebrenderResources() {
1439   if (!mLayerManager || !mLayerManager->AsWebRenderLayerManager()) {
1440     return;
1441   }
1442   mLayerManager->ClearCachedResources();
1443 }
1444
1445 already_AddRefed<gfx::DrawTarget> nsBaseWidget::StartRemoteDrawing() {
1446   return nullptr;
1447 }
1448
1449 uint32_t nsBaseWidget::GetGLFrameBufferFormat() { return LOCAL_GL_RGBA; }
1450
1451 //-------------------------------------------------------------------------
1452 //
1453 // Destroy the window
1454 //
1455 //-------------------------------------------------------------------------
1456 void nsBaseWidget::OnDestroy() {
1457   if (mTextEventDispatcher) {
1458     mTextEventDispatcher->OnDestroyWidget();
1459     // Don't release it until this widget actually released because after this
1460     // is called, TextEventDispatcher() may create it again.
1461   }
1462
1463   // If this widget is being destroyed, let the APZ code know to drop references
1464   // to this widget. Callers of this function all should be holding a deathgrip
1465   // on this widget already.
1466   ReleaseContentController();
1467 }
1468
1469 void nsBaseWidget::MoveClient(const DesktopPoint& aOffset) {
1470   LayoutDeviceIntPoint clientOffset(GetClientOffset());
1471
1472   // GetClientOffset returns device pixels; scale back to desktop pixels
1473   // if that's what this widget uses for the Move/Resize APIs
1474   if (BoundsUseDesktopPixels()) {
1475     DesktopPoint desktopOffset = clientOffset / GetDesktopToDeviceScale();
1476     Move(aOffset.x - desktopOffset.x, aOffset.y - desktopOffset.y);
1477   } else {
1478     LayoutDevicePoint layoutOffset = aOffset * GetDesktopToDeviceScale();
1479     Move(layoutOffset.x - clientOffset.x, layoutOffset.y - clientOffset.y);
1480   }
1481 }
1482
1483 void nsBaseWidget::ResizeClient(const DesktopSize& aSize, bool aRepaint) {
1484   NS_ASSERTION((aSize.width >= 0), "Negative width passed to ResizeClient");
1485   NS_ASSERTION((aSize.height >= 0), "Negative height passed to ResizeClient");
1486
1487   LayoutDeviceIntRect clientBounds = GetClientBounds();
1488
1489   // GetClientBounds and mBounds are device pixels; scale back to desktop pixels
1490   // if that's what this widget uses for the Move/Resize APIs
1491   if (BoundsUseDesktopPixels()) {
1492     DesktopSize desktopDelta =
1493         (LayoutDeviceIntSize(mBounds.Width(), mBounds.Height()) -
1494          clientBounds.Size()) /
1495         GetDesktopToDeviceScale();
1496     Resize(aSize.width + desktopDelta.width, aSize.height + desktopDelta.height,
1497            aRepaint);
1498   } else {
1499     LayoutDeviceSize layoutSize = aSize * GetDesktopToDeviceScale();
1500     Resize(mBounds.Width() + (layoutSize.width - clientBounds.Width()),
1501            mBounds.Height() + (layoutSize.height - clientBounds.Height()),
1502            aRepaint);
1503   }
1504 }
1505
1506 void nsBaseWidget::ResizeClient(const DesktopRect& aRect, bool aRepaint) {
1507   NS_ASSERTION((aRect.Width() >= 0), "Negative width passed to ResizeClient");
1508   NS_ASSERTION((aRect.Height() >= 0), "Negative height passed to ResizeClient");
1509
1510   LayoutDeviceIntRect clientBounds = GetClientBounds();
1511   LayoutDeviceIntPoint clientOffset = GetClientOffset();
1512   DesktopToLayoutDeviceScale scale = GetDesktopToDeviceScale();
1513
1514   if (BoundsUseDesktopPixels()) {
1515     DesktopPoint desktopOffset = clientOffset / scale;
1516     DesktopSize desktopDelta =
1517         (LayoutDeviceIntSize(mBounds.Width(), mBounds.Height()) -
1518          clientBounds.Size()) /
1519         scale;
1520     Resize(aRect.X() - desktopOffset.x, aRect.Y() - desktopOffset.y,
1521            aRect.Width() + desktopDelta.width,
1522            aRect.Height() + desktopDelta.height, aRepaint);
1523   } else {
1524     LayoutDeviceRect layoutRect = aRect * scale;
1525     Resize(layoutRect.X() - clientOffset.x, layoutRect.Y() - clientOffset.y,
1526            layoutRect.Width() + mBounds.Width() - clientBounds.Width(),
1527            layoutRect.Height() + mBounds.Height() - clientBounds.Height(),
1528            aRepaint);
1529   }
1530 }
1531
1532 //-------------------------------------------------------------------------
1533 //
1534 // Bounds
1535 //
1536 //-------------------------------------------------------------------------
1537
1538 /**
1539  * If the implementation of nsWindow supports borders this method MUST be
1540  * overridden
1541  *
1542  **/
1543 LayoutDeviceIntRect nsBaseWidget::GetClientBounds() { return GetBounds(); }
1544
1545 /**
1546  * If the implementation of nsWindow supports borders this method MUST be
1547  * overridden
1548  *
1549  **/
1550 LayoutDeviceIntRect nsBaseWidget::GetBounds() { return mBounds; }
1551
1552 /**
1553  * If the implementation of nsWindow uses a local coordinate system within the
1554  *window, this method must be overridden
1555  *
1556  **/
1557 LayoutDeviceIntRect nsBaseWidget::GetScreenBounds() { return GetBounds(); }
1558
1559 nsresult nsBaseWidget::GetRestoredBounds(LayoutDeviceIntRect& aRect) {
1560   if (SizeMode() != nsSizeMode_Normal) {
1561     return NS_ERROR_FAILURE;
1562   }
1563   aRect = GetScreenBounds();
1564   return NS_OK;
1565 }
1566
1567 LayoutDeviceIntPoint nsBaseWidget::GetClientOffset() {
1568   return LayoutDeviceIntPoint(0, 0);
1569 }
1570
1571 nsresult nsBaseWidget::SetNonClientMargins(LayoutDeviceIntMargin& margins) {
1572   return NS_ERROR_NOT_IMPLEMENTED;
1573 }
1574
1575 uint32_t nsBaseWidget::GetMaxTouchPoints() const { return 0; }
1576
1577 bool nsBaseWidget::HasPendingInputEvent() { return false; }
1578
1579 bool nsBaseWidget::ShowsResizeIndicator(LayoutDeviceIntRect* aResizerRect) {
1580   return false;
1581 }
1582
1583 /**
1584  * Modifies aFile to point at an icon file with the given name and suffix.  The
1585  * suffix may correspond to a file extension with leading '.' if appropriate.
1586  * Returns true if the icon file exists and can be read.
1587  */
1588 static bool ResolveIconNameHelper(nsIFile* aFile, const nsAString& aIconName,
1589                                   const nsAString& aIconSuffix) {
1590   aFile->Append(u"icons"_ns);
1591   aFile->Append(u"default"_ns);
1592   aFile->Append(aIconName + aIconSuffix);
1593
1594   bool readable;
1595   return NS_SUCCEEDED(aFile->IsReadable(&readable)) && readable;
1596 }
1597
1598 /**
1599  * Resolve the given icon name into a local file object.  This method is
1600  * intended to be called by subclasses of nsBaseWidget.  aIconSuffix is a
1601  * platform specific icon file suffix (e.g., ".ico" under Win32).
1602  *
1603  * If no file is found matching the given parameters, then null is returned.
1604  */
1605 void nsBaseWidget::ResolveIconName(const nsAString& aIconName,
1606                                    const nsAString& aIconSuffix,
1607                                    nsIFile** aResult) {
1608   *aResult = nullptr;
1609
1610   nsCOMPtr<nsIProperties> dirSvc =
1611       do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID);
1612   if (!dirSvc) return;
1613
1614   // first check auxilary chrome directories
1615
1616   nsCOMPtr<nsISimpleEnumerator> dirs;
1617   dirSvc->Get(NS_APP_CHROME_DIR_LIST, NS_GET_IID(nsISimpleEnumerator),
1618               getter_AddRefs(dirs));
1619   if (dirs) {
1620     bool hasMore;
1621     while (NS_SUCCEEDED(dirs->HasMoreElements(&hasMore)) && hasMore) {
1622       nsCOMPtr<nsISupports> element;
1623       dirs->GetNext(getter_AddRefs(element));
1624       if (!element) continue;
1625       nsCOMPtr<nsIFile> file = do_QueryInterface(element);
1626       if (!file) continue;
1627       if (ResolveIconNameHelper(file, aIconName, aIconSuffix)) {
1628         NS_ADDREF(*aResult = file);
1629         return;
1630       }
1631     }
1632   }
1633
1634   // then check the main app chrome directory
1635
1636   nsCOMPtr<nsIFile> file;
1637   dirSvc->Get(NS_APP_CHROME_DIR, NS_GET_IID(nsIFile), getter_AddRefs(file));
1638   if (file && ResolveIconNameHelper(file, aIconName, aIconSuffix))
1639     NS_ADDREF(*aResult = file);
1640 }
1641
1642 void nsBaseWidget::SetSizeConstraints(const SizeConstraints& aConstraints) {
1643   mSizeConstraints = aConstraints;
1644
1645   // Popups are constrained during layout, and we don't want to synchronously
1646   // paint from reflow, so bail out... This is not great, but it's no worse than
1647   // what we used to do.
1648   //
1649   // The right fix here is probably making constraint changes go through the
1650   // view manager and such.
1651   if (mWindowType == eWindowType_popup) {
1652     return;
1653   }
1654
1655   // If the current size doesn't meet the new constraints, trigger a
1656   // resize to apply it. Note that, we don't want to invoke Resize if
1657   // the new constraints don't affect the current size, because Resize
1658   // implementation on some platforms may touch other geometry even if
1659   // the size don't need to change.
1660   LayoutDeviceIntSize curSize = mBounds.Size();
1661   LayoutDeviceIntSize clampedSize =
1662       Max(aConstraints.mMinSize, Min(aConstraints.mMaxSize, curSize));
1663   if (clampedSize != curSize) {
1664     gfx::Size size;
1665     if (BoundsUseDesktopPixels()) {
1666       DesktopSize desktopSize = clampedSize / GetDesktopToDeviceScale();
1667       size = desktopSize.ToUnknownSize();
1668     } else {
1669       size = gfx::Size(clampedSize.ToUnknownSize());
1670     }
1671     Resize(size.width, size.height, true);
1672   }
1673 }
1674
1675 const widget::SizeConstraints nsBaseWidget::GetSizeConstraints() {
1676   return mSizeConstraints;
1677 }
1678
1679 // static
1680 nsIRollupListener* nsBaseWidget::GetActiveRollupListener() {
1681   // If set, then this is likely an <html:select> dropdown.
1682   if (gRollupListener) return gRollupListener;
1683
1684   return nsXULPopupManager::GetInstance();
1685 }
1686
1687 void nsBaseWidget::NotifyWindowDestroyed() {
1688   if (!mWidgetListener) return;
1689
1690   nsCOMPtr<nsIAppWindow> window = mWidgetListener->GetAppWindow();
1691   nsCOMPtr<nsIBaseWindow> appWindow(do_QueryInterface(window));
1692   if (appWindow) {
1693     appWindow->Destroy();
1694   }
1695 }
1696
1697 void nsBaseWidget::NotifyWindowMoved(int32_t aX, int32_t aY) {
1698   if (mWidgetListener) {
1699     mWidgetListener->WindowMoved(this, aX, aY);
1700   }
1701
1702   if (mIMEHasFocus && IMENotificationRequestsRef().WantPositionChanged()) {
1703     NotifyIME(IMENotification(IMEMessage::NOTIFY_IME_OF_POSITION_CHANGE));
1704   }
1705 }
1706
1707 void nsBaseWidget::NotifySizeMoveDone() {
1708   if (!mWidgetListener) {
1709     return;
1710   }
1711   if (PresShell* presShell = mWidgetListener->GetPresShell()) {
1712     presShell->WindowSizeMoveDone();
1713   }
1714 }
1715
1716 void nsBaseWidget::NotifyThemeChanged(ThemeChangeKind aKind) {
1717   if (!mWidgetListener) {
1718     return;
1719   }
1720   if (PresShell* presShell = mWidgetListener->GetPresShell()) {
1721     presShell->ThemeChanged(aKind);
1722   }
1723 }
1724
1725 void nsBaseWidget::NotifyUIStateChanged(UIStateChangeType aShowFocusRings) {
1726   if (Document* doc = GetDocument()) {
1727     if (nsPIDOMWindowOuter* win = doc->GetWindow()) {
1728       win->SetKeyboardIndicators(aShowFocusRings);
1729     }
1730   }
1731 }
1732
1733 nsresult nsBaseWidget::NotifyIME(const IMENotification& aIMENotification) {
1734   if (mIMEHasQuit) {
1735     return NS_OK;
1736   }
1737   switch (aIMENotification.mMessage) {
1738     case REQUEST_TO_COMMIT_COMPOSITION:
1739     case REQUEST_TO_CANCEL_COMPOSITION:
1740       // We should send request to IME only when there is a TextEventDispatcher
1741       // instance (this means that this widget has dispatched at least one
1742       // composition event or keyboard event) and the it has composition.
1743       // Otherwise, there is nothing to do.
1744       // Note that if current input transaction is for native input events,
1745       // TextEventDispatcher::NotifyIME() will call
1746       // TextEventDispatcherListener::NotifyIME().
1747       if (mTextEventDispatcher && mTextEventDispatcher->IsComposing()) {
1748         return mTextEventDispatcher->NotifyIME(aIMENotification);
1749       }
1750       return NS_OK;
1751     default: {
1752       if (aIMENotification.mMessage == NOTIFY_IME_OF_FOCUS) {
1753         mIMEHasFocus = true;
1754       }
1755       EnsureTextEventDispatcher();
1756       // TextEventDispatcher::NotifyIME() will always call
1757       // TextEventDispatcherListener::NotifyIME().  I.e., even if current
1758       // input transaction is for synthesized events for automated tests,
1759       // notifications will be sent to native IME.
1760       nsresult rv = mTextEventDispatcher->NotifyIME(aIMENotification);
1761       if (aIMENotification.mMessage == NOTIFY_IME_OF_BLUR) {
1762         mIMEHasFocus = false;
1763       }
1764       return rv;
1765     }
1766   }
1767 }
1768
1769 void nsBaseWidget::EnsureTextEventDispatcher() {
1770   if (mTextEventDispatcher) {
1771     return;
1772   }
1773   mTextEventDispatcher = new TextEventDispatcher(this);
1774 }
1775
1776 nsIWidget::NativeIMEContext nsBaseWidget::GetNativeIMEContext() {
1777   if (mTextEventDispatcher && mTextEventDispatcher->GetPseudoIMEContext()) {
1778     // If we already have a TextEventDispatcher and it's working with
1779     // a TextInputProcessor, we need to return pseudo IME context since
1780     // TextCompositionArray::IndexOf(nsIWidget*) should return a composition
1781     // on the pseudo IME context in such case.
1782     NativeIMEContext pseudoIMEContext;
1783     pseudoIMEContext.InitWithRawNativeIMEContext(
1784         mTextEventDispatcher->GetPseudoIMEContext());
1785     return pseudoIMEContext;
1786   }
1787   return NativeIMEContext(this);
1788 }
1789
1790 nsIWidget::TextEventDispatcher* nsBaseWidget::GetTextEventDispatcher() {
1791   EnsureTextEventDispatcher();
1792   return mTextEventDispatcher;
1793 }
1794
1795 void* nsBaseWidget::GetPseudoIMEContext() {
1796   TextEventDispatcher* dispatcher = GetTextEventDispatcher();
1797   if (!dispatcher) {
1798     return nullptr;
1799   }
1800   return dispatcher->GetPseudoIMEContext();
1801 }
1802
1803 TextEventDispatcherListener*
1804 nsBaseWidget::GetNativeTextEventDispatcherListener() {
1805   // TODO: If all platforms supported use of TextEventDispatcher for handling
1806   //       native IME and keyboard events, this method should be removed since
1807   //       in such case, this is overridden by all the subclasses.
1808   return nullptr;
1809 }
1810
1811 void nsBaseWidget::ZoomToRect(const uint32_t& aPresShellId,
1812                               const ScrollableLayerGuid::ViewID& aViewId,
1813                               const CSSRect& aRect, const uint32_t& aFlags) {
1814   if (!mCompositorSession || !mAPZC) {
1815     return;
1816   }
1817   LayersId layerId = mCompositorSession->RootLayerTreeId();
1818   APZThreadUtils::RunOnControllerThread(
1819       NewRunnableMethod<ScrollableLayerGuid, CSSRect, uint32_t>(
1820           "layers::IAPZCTreeManager::ZoomToRect", mAPZC,
1821           &IAPZCTreeManager::ZoomToRect,
1822           ScrollableLayerGuid(layerId, aPresShellId, aViewId), aRect, aFlags));
1823 }
1824
1825 #ifdef ACCESSIBILITY
1826
1827 a11y::LocalAccessible* nsBaseWidget::GetRootAccessible() {
1828   NS_ENSURE_TRUE(mWidgetListener, nullptr);
1829
1830   PresShell* presShell = mWidgetListener->GetPresShell();
1831   NS_ENSURE_TRUE(presShell, nullptr);
1832
1833   // If container is null then the presshell is not active. This often happens
1834   // when a preshell is being held onto for fastback.
1835   nsPresContext* presContext = presShell->GetPresContext();
1836   NS_ENSURE_TRUE(presContext->GetContainerWeak(), nullptr);
1837
1838   // LocalAccessible creation might be not safe so use IsSafeToRunScript to
1839   // make sure it's not created at unsafe times.
1840   nsAccessibilityService* accService = GetOrCreateAccService();
1841   if (accService) {
1842     return accService->GetRootDocumentAccessible(
1843         presShell, nsContentUtils::IsSafeToRunScript());
1844   }
1845
1846   return nullptr;
1847 }
1848
1849 #endif  // ACCESSIBILITY
1850
1851 void nsBaseWidget::StartAsyncScrollbarDrag(
1852     const AsyncDragMetrics& aDragMetrics) {
1853   if (!AsyncPanZoomEnabled()) {
1854     return;
1855   }
1856
1857   MOZ_ASSERT(XRE_IsParentProcess() && mCompositorSession);
1858
1859   LayersId layersId = mCompositorSession->RootLayerTreeId();
1860   ScrollableLayerGuid guid(layersId, aDragMetrics.mPresShellId,
1861                            aDragMetrics.mViewId);
1862
1863   APZThreadUtils::RunOnControllerThread(
1864       NewRunnableMethod<ScrollableLayerGuid, AsyncDragMetrics>(
1865           "layers::IAPZCTreeManager::StartScrollbarDrag", mAPZC,
1866           &IAPZCTreeManager::StartScrollbarDrag, guid, aDragMetrics));
1867 }
1868
1869 bool nsBaseWidget::StartAsyncAutoscroll(const ScreenPoint& aAnchorLocation,
1870                                         const ScrollableLayerGuid& aGuid) {
1871   MOZ_ASSERT(XRE_IsParentProcess() && AsyncPanZoomEnabled());
1872
1873   return mAPZC->StartAutoscroll(aGuid, aAnchorLocation);
1874 }
1875
1876 void nsBaseWidget::StopAsyncAutoscroll(const ScrollableLayerGuid& aGuid) {
1877   MOZ_ASSERT(XRE_IsParentProcess() && AsyncPanZoomEnabled());
1878
1879   mAPZC->StopAutoscroll(aGuid);
1880 }
1881
1882 already_AddRefed<nsIScreen> nsBaseWidget::GetWidgetScreen() {
1883   nsCOMPtr<nsIScreenManager> screenManager;
1884   screenManager = do_GetService("@mozilla.org/gfx/screenmanager;1");
1885   if (!screenManager) {
1886     return nullptr;
1887   }
1888
1889   LayoutDeviceIntRect bounds = GetScreenBounds();
1890   DesktopIntRect deskBounds = RoundedToInt(bounds / GetDesktopToDeviceScale());
1891   nsCOMPtr<nsIScreen> screen;
1892   screenManager->ScreenForRect(deskBounds.X(), deskBounds.Y(),
1893                                deskBounds.Width(), deskBounds.Height(),
1894                                getter_AddRefs(screen));
1895   return screen.forget();
1896 }
1897
1898 mozilla::DesktopToLayoutDeviceScale
1899 nsBaseWidget::GetDesktopToDeviceScaleByScreen() {
1900   return (nsView::GetViewFor(this)->GetViewManager()->GetDeviceContext())
1901       ->GetDesktopToDeviceScale();
1902 }
1903
1904 nsresult nsIWidget::SynthesizeNativeTouchTap(LayoutDeviceIntPoint aPoint,
1905                                              bool aLongTap,
1906                                              nsIObserver* aObserver) {
1907   AutoObserverNotifier notifier(aObserver, "touchtap");
1908
1909   if (sPointerIdCounter > TOUCH_INJECT_MAX_POINTS) {
1910     sPointerIdCounter = 0;
1911   }
1912   int pointerId = sPointerIdCounter;
1913   sPointerIdCounter++;
1914   nsresult rv = SynthesizeNativeTouchPoint(pointerId, TOUCH_CONTACT, aPoint,
1915                                            1.0, 90, nullptr);
1916   if (NS_FAILED(rv)) {
1917     return rv;
1918   }
1919
1920   if (!aLongTap) {
1921     return SynthesizeNativeTouchPoint(pointerId, TOUCH_REMOVE, aPoint, 0, 0,
1922                                       nullptr);
1923   }
1924
1925   // initiate a long tap
1926   int elapse = Preferences::GetInt("ui.click_hold_context_menus.delay",
1927                                    TOUCH_INJECT_LONG_TAP_DEFAULT_MSEC);
1928   if (!mLongTapTimer) {
1929     mLongTapTimer = NS_NewTimer();
1930     if (!mLongTapTimer) {
1931       SynthesizeNativeTouchPoint(pointerId, TOUCH_CANCEL, aPoint, 0, 0,
1932                                  nullptr);
1933       return NS_ERROR_UNEXPECTED;
1934     }
1935     // Windows requires recuring events, so we set this to a smaller window
1936     // than the pref value.
1937     int timeout = elapse;
1938     if (timeout > TOUCH_INJECT_PUMP_TIMER_MSEC) {
1939       timeout = TOUCH_INJECT_PUMP_TIMER_MSEC;
1940     }
1941     mLongTapTimer->InitWithNamedFuncCallback(
1942         OnLongTapTimerCallback, this, timeout, nsITimer::TYPE_REPEATING_SLACK,
1943         "nsIWidget::SynthesizeNativeTouchTap");
1944   }
1945
1946   // If we already have a long tap pending, cancel it. We only allow one long
1947   // tap to be active at a time.
1948   if (mLongTapTouchPoint) {
1949     SynthesizeNativeTouchPoint(mLongTapTouchPoint->mPointerId, TOUCH_CANCEL,
1950                                mLongTapTouchPoint->mPosition, 0, 0, nullptr);
1951   }
1952
1953   mLongTapTouchPoint = MakeUnique<LongTapInfo>(
1954       pointerId, aPoint, TimeDuration::FromMilliseconds(elapse), aObserver);
1955   notifier.SkipNotification();  // we'll do it in the long-tap callback
1956   return NS_OK;
1957 }
1958
1959 // static
1960 void nsIWidget::OnLongTapTimerCallback(nsITimer* aTimer, void* aClosure) {
1961   auto* self = static_cast<nsIWidget*>(aClosure);
1962
1963   if ((self->mLongTapTouchPoint->mStamp + self->mLongTapTouchPoint->mDuration) >
1964       TimeStamp::Now()) {
1965 #ifdef XP_WIN
1966     // Windows needs us to keep pumping feedback to the digitizer, so update
1967     // the pointer id with the same position.
1968     self->SynthesizeNativeTouchPoint(
1969         self->mLongTapTouchPoint->mPointerId, TOUCH_CONTACT,
1970         self->mLongTapTouchPoint->mPosition, 1.0, 90, nullptr);
1971 #endif
1972     return;
1973   }
1974
1975   AutoObserverNotifier notifier(self->mLongTapTouchPoint->mObserver,
1976                                 "touchtap");
1977
1978   // finished, remove the touch point
1979   self->mLongTapTimer->Cancel();
1980   self->mLongTapTimer = nullptr;
1981   self->SynthesizeNativeTouchPoint(
1982       self->mLongTapTouchPoint->mPointerId, TOUCH_REMOVE,
1983       self->mLongTapTouchPoint->mPosition, 0, 0, nullptr);
1984   self->mLongTapTouchPoint = nullptr;
1985 }
1986
1987 nsresult nsIWidget::ClearNativeTouchSequence(nsIObserver* aObserver) {
1988   AutoObserverNotifier notifier(aObserver, "cleartouch");
1989
1990   if (!mLongTapTimer) {
1991     return NS_OK;
1992   }
1993   mLongTapTimer->Cancel();
1994   mLongTapTimer = nullptr;
1995   SynthesizeNativeTouchPoint(mLongTapTouchPoint->mPointerId, TOUCH_CANCEL,
1996                              mLongTapTouchPoint->mPosition, 0, 0, nullptr);
1997   mLongTapTouchPoint = nullptr;
1998   return NS_OK;
1999 }
2000
2001 MultiTouchInput nsBaseWidget::UpdateSynthesizedTouchState(
2002     MultiTouchInput* aState, uint32_t aTime, mozilla::TimeStamp aTimeStamp,
2003     uint32_t aPointerId, TouchPointerState aPointerState,
2004     LayoutDeviceIntPoint aPoint, double aPointerPressure,
2005     uint32_t aPointerOrientation) {
2006   ScreenIntPoint pointerScreenPoint = ViewAs<ScreenPixel>(
2007       aPoint, PixelCastJustification::LayoutDeviceIsScreenForBounds);
2008
2009   // We can't dispatch *aState directly because (a) dispatching
2010   // it might inadvertently modify it and (b) in the case of touchend or
2011   // touchcancel events aState will hold the touches that are
2012   // still down whereas the input dispatched needs to hold the removed
2013   // touch(es). We use |inputToDispatch| for this purpose.
2014   MultiTouchInput inputToDispatch;
2015   inputToDispatch.mInputType = MULTITOUCH_INPUT;
2016   inputToDispatch.mTime = aTime;
2017   inputToDispatch.mTimeStamp = aTimeStamp;
2018
2019   int32_t index = aState->IndexOfTouch((int32_t)aPointerId);
2020   if (aPointerState == TOUCH_CONTACT) {
2021     if (index >= 0) {
2022       // found an existing touch point, update it
2023       SingleTouchData& point = aState->mTouches[index];
2024       point.mScreenPoint = pointerScreenPoint;
2025       point.mRotationAngle = (float)aPointerOrientation;
2026       point.mForce = (float)aPointerPressure;
2027       inputToDispatch.mType = MultiTouchInput::MULTITOUCH_MOVE;
2028     } else {
2029       // new touch point, add it
2030       aState->mTouches.AppendElement(SingleTouchData(
2031           (int32_t)aPointerId, pointerScreenPoint, ScreenSize(0, 0),
2032           (float)aPointerOrientation, (float)aPointerPressure));
2033       inputToDispatch.mType = MultiTouchInput::MULTITOUCH_START;
2034     }
2035     inputToDispatch.mTouches = aState->mTouches;
2036   } else {
2037     MOZ_ASSERT(aPointerState == TOUCH_REMOVE || aPointerState == TOUCH_CANCEL);
2038     // a touch point is being lifted, so remove it from the stored list
2039     if (index >= 0) {
2040       aState->mTouches.RemoveElementAt(index);
2041     }
2042     inputToDispatch.mType =
2043         (aPointerState == TOUCH_REMOVE ? MultiTouchInput::MULTITOUCH_END
2044                                        : MultiTouchInput::MULTITOUCH_CANCEL);
2045     inputToDispatch.mTouches.AppendElement(SingleTouchData(
2046         (int32_t)aPointerId, pointerScreenPoint, ScreenSize(0, 0),
2047         (float)aPointerOrientation, (float)aPointerPressure));
2048   }
2049
2050   return inputToDispatch;
2051 }
2052
2053 void nsBaseWidget::NotifyLiveResizeStarted() {
2054   // If we have mLiveResizeListeners already non-empty, we should notify those
2055   // listeners that the resize stopped before starting anew. In theory this
2056   // should never happen because we shouldn't get nested live resize actions.
2057   NotifyLiveResizeStopped();
2058   MOZ_ASSERT(mLiveResizeListeners.IsEmpty());
2059
2060   // If we can get the active remote tab for the current widget, suppress
2061   // the displayport on it during the live resize.
2062   if (!mWidgetListener) {
2063     return;
2064   }
2065   nsCOMPtr<nsIAppWindow> appWindow = mWidgetListener->GetAppWindow();
2066   if (!appWindow) {
2067     return;
2068   }
2069   mLiveResizeListeners = appWindow->GetLiveResizeListeners();
2070   for (uint32_t i = 0; i < mLiveResizeListeners.Length(); i++) {
2071     mLiveResizeListeners[i]->LiveResizeStarted();
2072   }
2073 }
2074
2075 void nsBaseWidget::NotifyLiveResizeStopped() {
2076   if (!mLiveResizeListeners.IsEmpty()) {
2077     for (uint32_t i = 0; i < mLiveResizeListeners.Length(); i++) {
2078       mLiveResizeListeners[i]->LiveResizeStopped();
2079     }
2080     mLiveResizeListeners.Clear();
2081   }
2082 }
2083
2084 void nsBaseWidget::RegisterPluginWindowForRemoteUpdates() {
2085 #if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
2086   MOZ_ASSERT_UNREACHABLE(
2087       "nsBaseWidget::RegisterPluginWindowForRemoteUpdates "
2088       "not implemented!");
2089   return;
2090 #else
2091   MOZ_ASSERT(NS_IsMainThread());
2092   void* id = GetNativeData(NS_NATIVE_PLUGIN_ID);
2093   if (!id) {
2094     NS_WARNING("This is not a valid native widget!");
2095     return;
2096   }
2097   MOZ_ASSERT(sPluginWidgetList);
2098   sPluginWidgetList->InsertOrUpdate(id, RefPtr{this});
2099 #endif
2100 }
2101
2102 void nsBaseWidget::UnregisterPluginWindowForRemoteUpdates() {
2103 #if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
2104   MOZ_ASSERT_UNREACHABLE(
2105       "nsBaseWidget::UnregisterPluginWindowForRemoteUpdates "
2106       "not implemented!");
2107   return;
2108 #else
2109   MOZ_ASSERT(NS_IsMainThread());
2110   void* id = GetNativeData(NS_NATIVE_PLUGIN_ID);
2111   if (!id) {
2112     NS_WARNING("This is not a valid native widget!");
2113     return;
2114   }
2115   MOZ_ASSERT(sPluginWidgetList);
2116   sPluginWidgetList->Remove(id);
2117 #endif
2118 }
2119
2120 nsresult nsBaseWidget::AsyncEnableDragDrop(bool aEnable) {
2121   RefPtr<nsBaseWidget> kungFuDeathGrip = this;
2122   return NS_DispatchToCurrentThreadQueue(
2123       NS_NewRunnableFunction(
2124           "AsyncEnableDragDropFn",
2125           [this, aEnable, kungFuDeathGrip]() { EnableDragDrop(aEnable); }),
2126       kAsyncDragDropTimeout, EventQueuePriority::Idle);
2127 }
2128
2129 // static
2130 nsIWidget* nsIWidget::LookupRegisteredPluginWindow(uintptr_t aWindowID) {
2131 #if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
2132   MOZ_ASSERT_UNREACHABLE(
2133       "nsBaseWidget::LookupRegisteredPluginWindow "
2134       "not implemented!");
2135   return nullptr;
2136 #else
2137   MOZ_ASSERT(NS_IsMainThread());
2138   MOZ_ASSERT(sPluginWidgetList);
2139   return sPluginWidgetList->GetWeak((void*)aWindowID);
2140 #endif
2141 }
2142
2143 // static
2144 void nsIWidget::UpdateRegisteredPluginWindowVisibility(
2145     uintptr_t aOwnerWidget, nsTArray<uintptr_t>& aPluginIds) {
2146 #if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
2147   MOZ_ASSERT_UNREACHABLE(
2148       "nsBaseWidget::UpdateRegisteredPluginWindowVisibility"
2149       " not implemented!");
2150   return;
2151 #else
2152   MOZ_ASSERT(NS_IsMainThread());
2153   MOZ_ASSERT(sPluginWidgetList);
2154
2155   // Our visible list is associated with a compositor which is associated with
2156   // a specific top level window. We use the parent widget during iteration
2157   // to skip the plugin widgets owned by other top level windows.
2158   for (auto iter = sPluginWidgetList->Iter(); !iter.Done(); iter.Next()) {
2159     const void* windowId = iter.Key();
2160     nsIWidget* widget = iter.UserData();
2161
2162     MOZ_ASSERT(windowId);
2163     MOZ_ASSERT(widget);
2164
2165     if (!widget->Destroyed()) {
2166       if ((uintptr_t)widget->GetParent() == aOwnerWidget) {
2167         widget->Show(aPluginIds.Contains((uintptr_t)windowId));
2168       }
2169     }
2170   }
2171 #endif
2172 }
2173
2174 #if defined(XP_WIN)
2175 // static
2176 void nsIWidget::CaptureRegisteredPlugins(uintptr_t aOwnerWidget) {
2177   MOZ_ASSERT(NS_IsMainThread());
2178   MOZ_ASSERT(sPluginWidgetList);
2179
2180   // Our visible list is associated with a compositor which is associated with
2181   // a specific top level window. We use the parent widget during iteration
2182   // to skip the plugin widgets owned by other top level windows.
2183   for (auto iter = sPluginWidgetList->Iter(); !iter.Done(); iter.Next()) {
2184     DebugOnly<const void*> windowId = iter.Key();
2185     nsIWidget* widget = iter.UserData();
2186
2187     MOZ_ASSERT(windowId);
2188     MOZ_ASSERT(widget);
2189
2190     if (!widget->Destroyed() && widget->IsVisible()) {
2191       if ((uintptr_t)widget->GetParent() == aOwnerWidget) {
2192         widget->UpdateScrollCapture();
2193       }
2194     }
2195   }
2196 }
2197
2198 uint64_t nsBaseWidget::CreateScrollCaptureContainer() {
2199   mScrollCaptureContainer =
2200       LayerManager::CreateImageContainer(ImageContainer::ASYNCHRONOUS);
2201   if (!mScrollCaptureContainer) {
2202     NS_WARNING("Failed to create ImageContainer for widget image capture.");
2203     return ImageContainer::sInvalidAsyncContainerId;
2204   }
2205
2206   return mScrollCaptureContainer->GetAsyncContainerHandle().Value();
2207 }
2208
2209 void nsBaseWidget::UpdateScrollCapture() {
2210   // Don't capture if no container or no size.
2211   if (!mScrollCaptureContainer || mBounds.IsEmpty()) {
2212     return;
2213   }
2214
2215   // If the derived class cannot take a snapshot, for example due to clipping,
2216   // then it is responsible for creating a fallback. If null is returned, this
2217   // means that we want to keep the existing snapshot.
2218   RefPtr<gfx::SourceSurface> snapshot = CreateScrollSnapshot();
2219   if (!snapshot) {
2220     return;
2221   }
2222
2223   ImageContainer::NonOwningImage holder(new SourceSurfaceImage(snapshot));
2224
2225   AutoTArray<ImageContainer::NonOwningImage, 1> imageList;
2226   imageList.AppendElement(holder);
2227
2228   mScrollCaptureContainer->SetCurrentImages(imageList);
2229 }
2230
2231 void nsBaseWidget::DefaultFillScrollCapture(DrawTarget* aSnapshotDrawTarget) {
2232   gfx::IntSize dtSize = aSnapshotDrawTarget->GetSize();
2233   aSnapshotDrawTarget->FillRect(
2234       gfx::Rect(0, 0, dtSize.width, dtSize.height),
2235       gfx::ColorPattern(gfx::ToDeviceColor(kScrollCaptureFillColor)),
2236       gfx::DrawOptions(1.f, gfx::CompositionOp::OP_SOURCE));
2237   aSnapshotDrawTarget->Flush();
2238 }
2239 #endif
2240
2241 const IMENotificationRequests& nsIWidget::IMENotificationRequestsRef() {
2242   TextEventDispatcher* dispatcher = GetTextEventDispatcher();
2243   return dispatcher->IMENotificationRequestsRef();
2244 }
2245
2246 void nsIWidget::PostHandleKeyEvent(mozilla::WidgetKeyboardEvent* aEvent) {}
2247
2248 bool nsIWidget::GetEditCommands(nsIWidget::NativeKeyBindingsType aType,
2249                                 const WidgetKeyboardEvent& aEvent,
2250                                 nsTArray<CommandInt>& aCommands) {
2251   MOZ_ASSERT(aEvent.IsTrusted());
2252   MOZ_ASSERT(aCommands.IsEmpty());
2253   return true;
2254 }
2255
2256 already_AddRefed<nsIBidiKeyboard> nsIWidget::CreateBidiKeyboard() {
2257   if (XRE_IsContentProcess()) {
2258     return CreateBidiKeyboardContentProcess();
2259   }
2260   return CreateBidiKeyboardInner();
2261 }
2262
2263 #ifdef ANDROID
2264 already_AddRefed<nsIBidiKeyboard> nsIWidget::CreateBidiKeyboardInner() {
2265   // no bidi keyboard implementation
2266   return nullptr;
2267 }
2268 #endif
2269
2270 namespace mozilla::widget {
2271
2272 const char* ToChar(InputContext::Origin aOrigin) {
2273   switch (aOrigin) {
2274     case InputContext::ORIGIN_MAIN:
2275       return "ORIGIN_MAIN";
2276     case InputContext::ORIGIN_CONTENT:
2277       return "ORIGIN_CONTENT";
2278     default:
2279       return "Unexpected value";
2280   }
2281 }
2282
2283 const char* ToChar(IMEMessage aIMEMessage) {
2284   switch (aIMEMessage) {
2285     case NOTIFY_IME_OF_NOTHING:
2286       return "NOTIFY_IME_OF_NOTHING";
2287     case NOTIFY_IME_OF_FOCUS:
2288       return "NOTIFY_IME_OF_FOCUS";
2289     case NOTIFY_IME_OF_BLUR:
2290       return "NOTIFY_IME_OF_BLUR";
2291     case NOTIFY_IME_OF_SELECTION_CHANGE:
2292       return "NOTIFY_IME_OF_SELECTION_CHANGE";
2293     case NOTIFY_IME_OF_TEXT_CHANGE:
2294       return "NOTIFY_IME_OF_TEXT_CHANGE";
2295     case NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED:
2296       return "NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED";
2297     case NOTIFY_IME_OF_POSITION_CHANGE:
2298       return "NOTIFY_IME_OF_POSITION_CHANGE";
2299     case NOTIFY_IME_OF_MOUSE_BUTTON_EVENT:
2300       return "NOTIFY_IME_OF_MOUSE_BUTTON_EVENT";
2301     case REQUEST_TO_COMMIT_COMPOSITION:
2302       return "REQUEST_TO_COMMIT_COMPOSITION";
2303     case REQUEST_TO_CANCEL_COMPOSITION:
2304       return "REQUEST_TO_CANCEL_COMPOSITION";
2305     default:
2306       return "Unexpected value";
2307   }
2308 }
2309
2310 void NativeIMEContext::Init(nsIWidget* aWidget) {
2311   if (!aWidget) {
2312     mRawNativeIMEContext = reinterpret_cast<uintptr_t>(nullptr);
2313     mOriginProcessID = static_cast<uint64_t>(-1);
2314     return;
2315   }
2316   if (!XRE_IsContentProcess()) {
2317     mRawNativeIMEContext = reinterpret_cast<uintptr_t>(
2318         aWidget->GetNativeData(NS_RAW_NATIVE_IME_CONTEXT));
2319     mOriginProcessID = 0;
2320     return;
2321   }
2322   // If this is created in a child process, aWidget is an instance of
2323   // PuppetWidget which doesn't support NS_RAW_NATIVE_IME_CONTEXT.
2324   // Instead of that PuppetWidget::GetNativeIMEContext() returns cached
2325   // native IME context of the parent process.
2326   *this = aWidget->GetNativeIMEContext();
2327 }
2328
2329 void NativeIMEContext::InitWithRawNativeIMEContext(void* aRawNativeIMEContext) {
2330   if (NS_WARN_IF(!aRawNativeIMEContext)) {
2331     mRawNativeIMEContext = reinterpret_cast<uintptr_t>(nullptr);
2332     mOriginProcessID = static_cast<uint64_t>(-1);
2333     return;
2334   }
2335   mRawNativeIMEContext = reinterpret_cast<uintptr_t>(aRawNativeIMEContext);
2336   mOriginProcessID =
2337       XRE_IsContentProcess() ? ContentChild::GetSingleton()->GetID() : 0;
2338 }
2339
2340 void IMENotification::TextChangeDataBase::MergeWith(
2341     const IMENotification::TextChangeDataBase& aOther) {
2342   MOZ_ASSERT(aOther.IsValid(), "Merging data must store valid data");
2343   MOZ_ASSERT(aOther.mStartOffset <= aOther.mRemovedEndOffset,
2344              "end of removed text must be same or larger than start");
2345   MOZ_ASSERT(aOther.mStartOffset <= aOther.mAddedEndOffset,
2346              "end of added text must be same or larger than start");
2347
2348   if (!IsValid()) {
2349     *this = aOther;
2350     return;
2351   }
2352
2353   // |mStartOffset| and |mRemovedEndOffset| represent all replaced or removed
2354   // text ranges.  I.e., mStartOffset should be the smallest offset of all
2355   // modified text ranges in old text.  |mRemovedEndOffset| should be the
2356   // largest end offset in old text of all modified text ranges.
2357   // |mAddedEndOffset| represents the end offset of all inserted text ranges.
2358   // I.e., only this is an offset in new text.
2359   // In other words, between mStartOffset and |mRemovedEndOffset| of the
2360   // premodified text was already removed.  And some text whose length is
2361   // |mAddedEndOffset - mStartOffset| is inserted to |mStartOffset|.  I.e.,
2362   // this allows IME to mark dirty the modified text range with |mStartOffset|
2363   // and |mRemovedEndOffset| if IME stores all text of the focused editor and
2364   // to compute new text length with |mAddedEndOffset| and |mRemovedEndOffset|.
2365   // Additionally, IME can retrieve only the text between |mStartOffset| and
2366   // |mAddedEndOffset| for updating stored text.
2367
2368   // For comparing new and old |mStartOffset|/|mRemovedEndOffset| values, they
2369   // should be adjusted to be in same text. The |newData.mStartOffset| and
2370   // |newData.mRemovedEndOffset| should be computed as in old text because
2371   // |mStartOffset| and |mRemovedEndOffset| represent the modified text range
2372   // in the old text but even if some text before the values of the newData
2373   // has already been modified, the values don't include the changes.
2374
2375   // For comparing new and old |mAddedEndOffset| values, they should be
2376   // adjusted to be in same text.  The |oldData.mAddedEndOffset| should be
2377   // computed as in the new text because |mAddedEndOffset| indicates the end
2378   // offset of inserted text in the new text but |oldData.mAddedEndOffset|
2379   // doesn't include any changes of the text before |newData.mAddedEndOffset|.
2380
2381   const TextChangeDataBase& newData = aOther;
2382   const TextChangeDataBase oldData = *this;
2383
2384   // mCausedOnlyByComposition should be true only when all changes are caused
2385   // by composition.
2386   mCausedOnlyByComposition =
2387       newData.mCausedOnlyByComposition && oldData.mCausedOnlyByComposition;
2388
2389   // mIncludingChangesWithoutComposition should be true if at least one of
2390   // merged changes occurred without composition.
2391   mIncludingChangesWithoutComposition =
2392       newData.mIncludingChangesWithoutComposition ||
2393       oldData.mIncludingChangesWithoutComposition;
2394
2395   // mIncludingChangesDuringComposition should be true when at least one of
2396   // the merged non-composition changes occurred during the latest composition.
2397   if (!newData.mCausedOnlyByComposition &&
2398       !newData.mIncludingChangesDuringComposition) {
2399     MOZ_ASSERT(newData.mIncludingChangesWithoutComposition);
2400     MOZ_ASSERT(mIncludingChangesWithoutComposition);
2401     // If new change is neither caused by composition nor occurred during
2402     // composition, set mIncludingChangesDuringComposition to false because
2403     // IME doesn't want outdated text changes as text change during current
2404     // composition.
2405     mIncludingChangesDuringComposition = false;
2406   } else {
2407     // Otherwise, set mIncludingChangesDuringComposition to true if either
2408     // oldData or newData includes changes during composition.
2409     mIncludingChangesDuringComposition =
2410         newData.mIncludingChangesDuringComposition ||
2411         oldData.mIncludingChangesDuringComposition;
2412   }
2413
2414   if (newData.mStartOffset >= oldData.mAddedEndOffset) {
2415     // Case 1:
2416     // If new start is after old end offset of added text, it means that text
2417     // after the modified range is modified.  Like:
2418     // added range of old change:             +----------+
2419     // removed range of new change:                           +----------+
2420     // So, the old start offset is always the smaller offset.
2421     mStartOffset = oldData.mStartOffset;
2422     // The new end offset of removed text is moved by the old change and we
2423     // need to cancel the move of the old change for comparing the offsets in
2424     // same text because it doesn't make sensce to compare offsets in different
2425     // text.
2426     uint32_t newRemovedEndOffsetInOldText =
2427         newData.mRemovedEndOffset - oldData.Difference();
2428     mRemovedEndOffset =
2429         std::max(newRemovedEndOffsetInOldText, oldData.mRemovedEndOffset);
2430     // The new end offset of added text is always the larger offset.
2431     mAddedEndOffset = newData.mAddedEndOffset;
2432     return;
2433   }
2434
2435   if (newData.mStartOffset >= oldData.mStartOffset) {
2436     // If new start is in the modified range, it means that new data changes
2437     // a part or all of the range.
2438     mStartOffset = oldData.mStartOffset;
2439     if (newData.mRemovedEndOffset >= oldData.mAddedEndOffset) {
2440       // Case 2:
2441       // If new end of removed text is greater than old end of added text, it
2442       // means that all or a part of modified range modified again and text
2443       // after the modified range is also modified.  Like:
2444       // added range of old change:             +----------+
2445       // removed range of new change:                   +----------+
2446       // So, the new removed end offset is moved by the old change and we need
2447       // to cancel the move of the old change for comparing the offsets in the
2448       // same text because it doesn't make sense to compare the offsets in
2449       // different text.
2450       uint32_t newRemovedEndOffsetInOldText =
2451           newData.mRemovedEndOffset - oldData.Difference();
2452       mRemovedEndOffset =
2453           std::max(newRemovedEndOffsetInOldText, oldData.mRemovedEndOffset);
2454       // The old end of added text is replaced by new change. So, it should be
2455       // same as the new start.  On the other hand, the new added end offset is
2456       // always same or larger.  Therefore, the merged end offset of added
2457       // text should be the new end offset of added text.
2458       mAddedEndOffset = newData.mAddedEndOffset;
2459       return;
2460     }
2461
2462     // Case 3:
2463     // If new end of removed text is less than old end of added text, it means
2464     // that only a part of the modified range is modified again.  Like:
2465     // added range of old change:             +------------+
2466     // removed range of new change:               +-----+
2467     // So, the new end offset of removed text should be same as the old end
2468     // offset of removed text.  Therefore, the merged end offset of removed
2469     // text should be the old text change's |mRemovedEndOffset|.
2470     mRemovedEndOffset = oldData.mRemovedEndOffset;
2471     // The old end of added text is moved by new change.  So, we need to cancel
2472     // the move of the new change for comparing the offsets in same text.
2473     uint32_t oldAddedEndOffsetInNewText =
2474         oldData.mAddedEndOffset + newData.Difference();
2475     mAddedEndOffset =
2476         std::max(newData.mAddedEndOffset, oldAddedEndOffsetInNewText);
2477     return;
2478   }
2479
2480   if (newData.mRemovedEndOffset >= oldData.mStartOffset) {
2481     // If new end of removed text is greater than old start (and new start is
2482     // less than old start), it means that a part of modified range is modified
2483     // again and some new text before the modified range is also modified.
2484     MOZ_ASSERT(newData.mStartOffset < oldData.mStartOffset,
2485                "new start offset should be less than old one here");
2486     mStartOffset = newData.mStartOffset;
2487     if (newData.mRemovedEndOffset >= oldData.mAddedEndOffset) {
2488       // Case 4:
2489       // If new end of removed text is greater than old end of added text, it
2490       // means that all modified text and text after the modified range is
2491       // modified.  Like:
2492       // added range of old change:             +----------+
2493       // removed range of new change:        +------------------+
2494       // So, the new end of removed text is moved by the old change.  Therefore,
2495       // we need to cancel the move of the old change for comparing the offsets
2496       // in same text because it doesn't make sense to compare the offsets in
2497       // different text.
2498       uint32_t newRemovedEndOffsetInOldText =
2499           newData.mRemovedEndOffset - oldData.Difference();
2500       mRemovedEndOffset =
2501           std::max(newRemovedEndOffsetInOldText, oldData.mRemovedEndOffset);
2502       // The old end of added text is replaced by new change.  So, the old end
2503       // offset of added text is same as new text change's start offset.  Then,
2504       // new change's end offset of added text is always same or larger than
2505       // it.  Therefore, merged end offset of added text is always the new end
2506       // offset of added text.
2507       mAddedEndOffset = newData.mAddedEndOffset;
2508       return;
2509     }
2510
2511     // Case 5:
2512     // If new end of removed text is less than old end of added text, it
2513     // means that only a part of the modified range is modified again.  Like:
2514     // added range of old change:             +----------+
2515     // removed range of new change:      +----------+
2516     // So, the new end of removed text should be same as old end of removed
2517     // text for preventing end of removed text to be modified.  Therefore,
2518     // merged end offset of removed text is always the old end offset of removed
2519     // text.
2520     mRemovedEndOffset = oldData.mRemovedEndOffset;
2521     // The old end of added text is moved by this change.  So, we need to
2522     // cancel the move of the new change for comparing the offsets in same text
2523     // because it doesn't make sense to compare the offsets in different text.
2524     uint32_t oldAddedEndOffsetInNewText =
2525         oldData.mAddedEndOffset + newData.Difference();
2526     mAddedEndOffset =
2527         std::max(newData.mAddedEndOffset, oldAddedEndOffsetInNewText);
2528     return;
2529   }
2530
2531   // Case 6:
2532   // Otherwise, i.e., both new end of added text and new start are less than
2533   // old start, text before the modified range is modified.  Like:
2534   // added range of old change:                  +----------+
2535   // removed range of new change: +----------+
2536   MOZ_ASSERT(newData.mStartOffset < oldData.mStartOffset,
2537              "new start offset should be less than old one here");
2538   mStartOffset = newData.mStartOffset;
2539   MOZ_ASSERT(newData.mRemovedEndOffset < oldData.mRemovedEndOffset,
2540              "new removed end offset should be less than old one here");
2541   mRemovedEndOffset = oldData.mRemovedEndOffset;
2542   // The end of added text should be adjusted with the new difference.
2543   uint32_t oldAddedEndOffsetInNewText =
2544       oldData.mAddedEndOffset + newData.Difference();
2545   mAddedEndOffset =
2546       std::max(newData.mAddedEndOffset, oldAddedEndOffsetInNewText);
2547 }
2548
2549 #ifdef DEBUG
2550
2551 // Let's test the code of merging multiple text change data in debug build
2552 // and crash if one of them fails because this feature is very complex but
2553 // cannot be tested with mochitest.
2554 void IMENotification::TextChangeDataBase::Test() {
2555   static bool gTestTextChangeEvent = true;
2556   if (!gTestTextChangeEvent) {
2557     return;
2558   }
2559   gTestTextChangeEvent = false;
2560
2561   /****************************************************************************
2562    * Case 1
2563    ****************************************************************************/
2564
2565   // Appending text
2566   MergeWith(TextChangeData(10, 10, 20, false, false));
2567   MergeWith(TextChangeData(20, 20, 35, false, false));
2568   MOZ_ASSERT(mStartOffset == 10,
2569              "Test 1-1-1: mStartOffset should be the first offset");
2570   MOZ_ASSERT(
2571       mRemovedEndOffset == 10,  // 20 - (20 - 10)
2572       "Test 1-1-2: mRemovedEndOffset should be the first end of removed text");
2573   MOZ_ASSERT(
2574       mAddedEndOffset == 35,
2575       "Test 1-1-3: mAddedEndOffset should be the last end of added text");
2576   Clear();
2577
2578   // Removing text (longer line -> shorter line)
2579   MergeWith(TextChangeData(10, 20, 10, false, false));
2580   MergeWith(TextChangeData(10, 30, 10, false, false));
2581   MOZ_ASSERT(mStartOffset == 10,
2582              "Test 1-2-1: mStartOffset should be the first offset");
2583   MOZ_ASSERT(mRemovedEndOffset == 40,  // 30 + (10 - 20)
2584              "Test 1-2-2: mRemovedEndOffset should be the the last end of "
2585              "removed text "
2586              "with already removed length");
2587   MOZ_ASSERT(
2588       mAddedEndOffset == 10,
2589       "Test 1-2-3: mAddedEndOffset should be the last end of added text");
2590   Clear();
2591
2592   // Removing text (shorter line -> longer line)
2593   MergeWith(TextChangeData(10, 20, 10, false, false));
2594   MergeWith(TextChangeData(10, 15, 10, false, false));
2595   MOZ_ASSERT(mStartOffset == 10,
2596              "Test 1-3-1: mStartOffset should be the first offset");
2597   MOZ_ASSERT(mRemovedEndOffset == 25,  // 15 + (10 - 20)
2598              "Test 1-3-2: mRemovedEndOffset should be the the last end of "
2599              "removed text "
2600              "with already removed length");
2601   MOZ_ASSERT(
2602       mAddedEndOffset == 10,
2603       "Test 1-3-3: mAddedEndOffset should be the last end of added text");
2604   Clear();
2605
2606   // Appending text at different point (not sure if actually occurs)
2607   MergeWith(TextChangeData(10, 10, 20, false, false));
2608   MergeWith(TextChangeData(55, 55, 60, false, false));
2609   MOZ_ASSERT(mStartOffset == 10,
2610              "Test 1-4-1: mStartOffset should be the smallest offset");
2611   MOZ_ASSERT(
2612       mRemovedEndOffset == 45,  // 55 - (10 - 20)
2613       "Test 1-4-2: mRemovedEndOffset should be the the largest end of removed "
2614       "text without already added length");
2615   MOZ_ASSERT(
2616       mAddedEndOffset == 60,
2617       "Test 1-4-3: mAddedEndOffset should be the last end of added text");
2618   Clear();
2619
2620   // Removing text at different point (not sure if actually occurs)
2621   MergeWith(TextChangeData(10, 20, 10, false, false));
2622   MergeWith(TextChangeData(55, 68, 55, false, false));
2623   MOZ_ASSERT(mStartOffset == 10,
2624              "Test 1-5-1: mStartOffset should be the smallest offset");
2625   MOZ_ASSERT(
2626       mRemovedEndOffset == 78,  // 68 - (10 - 20)
2627       "Test 1-5-2: mRemovedEndOffset should be the the largest end of removed "
2628       "text with already removed length");
2629   MOZ_ASSERT(
2630       mAddedEndOffset == 55,
2631       "Test 1-5-3: mAddedEndOffset should be the largest end of added text");
2632   Clear();
2633
2634   // Replacing text and append text (becomes longer)
2635   MergeWith(TextChangeData(30, 35, 32, false, false));
2636   MergeWith(TextChangeData(32, 32, 40, false, false));
2637   MOZ_ASSERT(mStartOffset == 30,
2638              "Test 1-6-1: mStartOffset should be the smallest offset");
2639   MOZ_ASSERT(
2640       mRemovedEndOffset == 35,  // 32 - (32 - 35)
2641       "Test 1-6-2: mRemovedEndOffset should be the the first end of removed "
2642       "text");
2643   MOZ_ASSERT(
2644       mAddedEndOffset == 40,
2645       "Test 1-6-3: mAddedEndOffset should be the last end of added text");
2646   Clear();
2647
2648   // Replacing text and append text (becomes shorter)
2649   MergeWith(TextChangeData(30, 35, 32, false, false));
2650   MergeWith(TextChangeData(32, 32, 33, false, false));
2651   MOZ_ASSERT(mStartOffset == 30,
2652              "Test 1-7-1: mStartOffset should be the smallest offset");
2653   MOZ_ASSERT(
2654       mRemovedEndOffset == 35,  // 32 - (32 - 35)
2655       "Test 1-7-2: mRemovedEndOffset should be the the first end of removed "
2656       "text");
2657   MOZ_ASSERT(
2658       mAddedEndOffset == 33,
2659       "Test 1-7-3: mAddedEndOffset should be the last end of added text");
2660   Clear();
2661
2662   // Removing text and replacing text after first range (not sure if actually
2663   // occurs)
2664   MergeWith(TextChangeData(30, 35, 30, false, false));
2665   MergeWith(TextChangeData(32, 34, 48, false, false));
2666   MOZ_ASSERT(mStartOffset == 30,
2667              "Test 1-8-1: mStartOffset should be the smallest offset");
2668   MOZ_ASSERT(mRemovedEndOffset == 39,  // 34 - (30 - 35)
2669              "Test 1-8-2: mRemovedEndOffset should be the the first end of "
2670              "removed text "
2671              "without already removed text");
2672   MOZ_ASSERT(
2673       mAddedEndOffset == 48,
2674       "Test 1-8-3: mAddedEndOffset should be the last end of added text");
2675   Clear();
2676
2677   // Removing text and replacing text after first range (not sure if actually
2678   // occurs)
2679   MergeWith(TextChangeData(30, 35, 30, false, false));
2680   MergeWith(TextChangeData(32, 38, 36, false, false));
2681   MOZ_ASSERT(mStartOffset == 30,
2682              "Test 1-9-1: mStartOffset should be the smallest offset");
2683   MOZ_ASSERT(mRemovedEndOffset == 43,  // 38 - (30 - 35)
2684              "Test 1-9-2: mRemovedEndOffset should be the the first end of "
2685              "removed text "
2686              "without already removed text");
2687   MOZ_ASSERT(
2688       mAddedEndOffset == 36,
2689       "Test 1-9-3: mAddedEndOffset should be the last end of added text");
2690   Clear();
2691
2692   /****************************************************************************
2693    * Case 2
2694    ****************************************************************************/
2695
2696   // Replacing text in around end of added text (becomes shorter) (not sure
2697   // if actually occurs)
2698   MergeWith(TextChangeData(50, 50, 55, false, false));
2699   MergeWith(TextChangeData(53, 60, 54, false, false));
2700   MOZ_ASSERT(mStartOffset == 50,
2701              "Test 2-1-1: mStartOffset should be the smallest offset");
2702   MOZ_ASSERT(mRemovedEndOffset == 55,  // 60 - (55 - 50)
2703              "Test 2-1-2: mRemovedEndOffset should be the the last end of "
2704              "removed text "
2705              "without already added text length");
2706   MOZ_ASSERT(
2707       mAddedEndOffset == 54,
2708       "Test 2-1-3: mAddedEndOffset should be the last end of added text");
2709   Clear();
2710
2711   // Replacing text around end of added text (becomes longer) (not sure
2712   // if actually occurs)
2713   MergeWith(TextChangeData(50, 50, 55, false, false));
2714   MergeWith(TextChangeData(54, 62, 68, false, false));
2715   MOZ_ASSERT(mStartOffset == 50,
2716              "Test 2-2-1: mStartOffset should be the smallest offset");
2717   MOZ_ASSERT(mRemovedEndOffset == 57,  // 62 - (55 - 50)
2718              "Test 2-2-2: mRemovedEndOffset should be the the last end of "
2719              "removed text "
2720              "without already added text length");
2721   MOZ_ASSERT(
2722       mAddedEndOffset == 68,
2723       "Test 2-2-3: mAddedEndOffset should be the last end of added text");
2724   Clear();
2725
2726   // Replacing text around end of replaced text (became shorter) (not sure if
2727   // actually occurs)
2728   MergeWith(TextChangeData(36, 48, 45, false, false));
2729   MergeWith(TextChangeData(43, 50, 49, false, false));
2730   MOZ_ASSERT(mStartOffset == 36,
2731              "Test 2-3-1: mStartOffset should be the smallest offset");
2732   MOZ_ASSERT(mRemovedEndOffset == 53,  // 50 - (45 - 48)
2733              "Test 2-3-2: mRemovedEndOffset should be the the last end of "
2734              "removed text "
2735              "without already removed text length");
2736   MOZ_ASSERT(
2737       mAddedEndOffset == 49,
2738       "Test 2-3-3: mAddedEndOffset should be the last end of added text");
2739   Clear();
2740
2741   // Replacing text around end of replaced text (became longer) (not sure if
2742   // actually occurs)
2743   MergeWith(TextChangeData(36, 52, 53, false, false));
2744   MergeWith(TextChangeData(43, 68, 61, false, false));
2745   MOZ_ASSERT(mStartOffset == 36,
2746              "Test 2-4-1: mStartOffset should be the smallest offset");
2747   MOZ_ASSERT(mRemovedEndOffset == 67,  // 68 - (53 - 52)
2748              "Test 2-4-2: mRemovedEndOffset should be the the last end of "
2749              "removed text "
2750              "without already added text length");
2751   MOZ_ASSERT(
2752       mAddedEndOffset == 61,
2753       "Test 2-4-3: mAddedEndOffset should be the last end of added text");
2754   Clear();
2755
2756   /****************************************************************************
2757    * Case 3
2758    ****************************************************************************/
2759
2760   // Appending text in already added text (not sure if actually occurs)
2761   MergeWith(TextChangeData(10, 10, 20, false, false));
2762   MergeWith(TextChangeData(15, 15, 30, false, false));
2763   MOZ_ASSERT(mStartOffset == 10,
2764              "Test 3-1-1: mStartOffset should be the smallest offset");
2765   MOZ_ASSERT(mRemovedEndOffset == 10,
2766              "Test 3-1-2: mRemovedEndOffset should be the the first end of "
2767              "removed text");
2768   MOZ_ASSERT(
2769       mAddedEndOffset == 35,  // 20 + (30 - 15)
2770       "Test 3-1-3: mAddedEndOffset should be the first end of added text with "
2771       "added text length by the new change");
2772   Clear();
2773
2774   // Replacing text in added text (not sure if actually occurs)
2775   MergeWith(TextChangeData(50, 50, 55, false, false));
2776   MergeWith(TextChangeData(52, 53, 56, false, false));
2777   MOZ_ASSERT(mStartOffset == 50,
2778              "Test 3-2-1: mStartOffset should be the smallest offset");
2779   MOZ_ASSERT(mRemovedEndOffset == 50,
2780              "Test 3-2-2: mRemovedEndOffset should be the the first end of "
2781              "removed text");
2782   MOZ_ASSERT(
2783       mAddedEndOffset == 58,  // 55 + (56 - 53)
2784       "Test 3-2-3: mAddedEndOffset should be the first end of added text with "
2785       "added text length by the new change");
2786   Clear();
2787
2788   // Replacing text in replaced text (became shorter) (not sure if actually
2789   // occurs)
2790   MergeWith(TextChangeData(36, 48, 45, false, false));
2791   MergeWith(TextChangeData(37, 38, 50, false, false));
2792   MOZ_ASSERT(mStartOffset == 36,
2793              "Test 3-3-1: mStartOffset should be the smallest offset");
2794   MOZ_ASSERT(mRemovedEndOffset == 48,
2795              "Test 3-3-2: mRemovedEndOffset should be the the first end of "
2796              "removed text");
2797   MOZ_ASSERT(
2798       mAddedEndOffset == 57,  // 45 + (50 - 38)
2799       "Test 3-3-3: mAddedEndOffset should be the first end of added text with "
2800       "added text length by the new change");
2801   Clear();
2802
2803   // Replacing text in replaced text (became longer) (not sure if actually
2804   // occurs)
2805   MergeWith(TextChangeData(32, 48, 53, false, false));
2806   MergeWith(TextChangeData(43, 50, 52, false, false));
2807   MOZ_ASSERT(mStartOffset == 32,
2808              "Test 3-4-1: mStartOffset should be the smallest offset");
2809   MOZ_ASSERT(mRemovedEndOffset == 48,
2810              "Test 3-4-2: mRemovedEndOffset should be the the last end of "
2811              "removed text "
2812              "without already added text length");
2813   MOZ_ASSERT(
2814       mAddedEndOffset == 55,  // 53 + (52 - 50)
2815       "Test 3-4-3: mAddedEndOffset should be the first end of added text with "
2816       "added text length by the new change");
2817   Clear();
2818
2819   // Replacing text in replaced text (became shorter) (not sure if actually
2820   // occurs)
2821   MergeWith(TextChangeData(36, 48, 50, false, false));
2822   MergeWith(TextChangeData(37, 49, 47, false, false));
2823   MOZ_ASSERT(mStartOffset == 36,
2824              "Test 3-5-1: mStartOffset should be the smallest offset");
2825   MOZ_ASSERT(
2826       mRemovedEndOffset == 48,
2827       "Test 3-5-2: mRemovedEndOffset should be the the first end of removed "
2828       "text");
2829   MOZ_ASSERT(mAddedEndOffset == 48,  // 50 + (47 - 49)
2830              "Test 3-5-3: mAddedEndOffset should be the first end of added "
2831              "text without "
2832              "removed text length by the new change");
2833   Clear();
2834
2835   // Replacing text in replaced text (became longer) (not sure if actually
2836   // occurs)
2837   MergeWith(TextChangeData(32, 48, 53, false, false));
2838   MergeWith(TextChangeData(43, 50, 47, false, false));
2839   MOZ_ASSERT(mStartOffset == 32,
2840              "Test 3-6-1: mStartOffset should be the smallest offset");
2841   MOZ_ASSERT(mRemovedEndOffset == 48,
2842              "Test 3-6-2: mRemovedEndOffset should be the the last end of "
2843              "removed text "
2844              "without already added text length");
2845   MOZ_ASSERT(mAddedEndOffset == 50,  // 53 + (47 - 50)
2846              "Test 3-6-3: mAddedEndOffset should be the first end of added "
2847              "text without "
2848              "removed text length by the new change");
2849   Clear();
2850
2851   /****************************************************************************
2852    * Case 4
2853    ****************************************************************************/
2854
2855   // Replacing text all of already append text (not sure if actually occurs)
2856   MergeWith(TextChangeData(50, 50, 55, false, false));
2857   MergeWith(TextChangeData(44, 66, 68, false, false));
2858   MOZ_ASSERT(mStartOffset == 44,
2859              "Test 4-1-1: mStartOffset should be the smallest offset");
2860   MOZ_ASSERT(mRemovedEndOffset == 61,  // 66 - (55 - 50)
2861              "Test 4-1-2: mRemovedEndOffset should be the the last end of "
2862              "removed text "
2863              "without already added text length");
2864   MOZ_ASSERT(
2865       mAddedEndOffset == 68,
2866       "Test 4-1-3: mAddedEndOffset should be the last end of added text");
2867   Clear();
2868
2869   // Replacing text around a point in which text was removed (not sure if
2870   // actually occurs)
2871   MergeWith(TextChangeData(50, 62, 50, false, false));
2872   MergeWith(TextChangeData(44, 66, 68, false, false));
2873   MOZ_ASSERT(mStartOffset == 44,
2874              "Test 4-2-1: mStartOffset should be the smallest offset");
2875   MOZ_ASSERT(mRemovedEndOffset == 78,  // 66 - (50 - 62)
2876              "Test 4-2-2: mRemovedEndOffset should be the the last end of "
2877              "removed text "
2878              "without already removed text length");
2879   MOZ_ASSERT(
2880       mAddedEndOffset == 68,
2881       "Test 4-2-3: mAddedEndOffset should be the last end of added text");
2882   Clear();
2883
2884   // Replacing text all replaced text (became shorter) (not sure if actually
2885   // occurs)
2886   MergeWith(TextChangeData(50, 62, 60, false, false));
2887   MergeWith(TextChangeData(49, 128, 130, false, false));
2888   MOZ_ASSERT(mStartOffset == 49,
2889              "Test 4-3-1: mStartOffset should be the smallest offset");
2890   MOZ_ASSERT(mRemovedEndOffset == 130,  // 128 - (60 - 62)
2891              "Test 4-3-2: mRemovedEndOffset should be the the last end of "
2892              "removed text "
2893              "without already removed text length");
2894   MOZ_ASSERT(
2895       mAddedEndOffset == 130,
2896       "Test 4-3-3: mAddedEndOffset should be the last end of added text");
2897   Clear();
2898
2899   // Replacing text all replaced text (became longer) (not sure if actually
2900   // occurs)
2901   MergeWith(TextChangeData(50, 61, 73, false, false));
2902   MergeWith(TextChangeData(44, 100, 50, false, false));
2903   MOZ_ASSERT(mStartOffset == 44,
2904              "Test 4-4-1: mStartOffset should be the smallest offset");
2905   MOZ_ASSERT(mRemovedEndOffset == 88,  // 100 - (73 - 61)
2906              "Test 4-4-2: mRemovedEndOffset should be the the last end of "
2907              "removed text "
2908              "with already added text length");
2909   MOZ_ASSERT(
2910       mAddedEndOffset == 50,
2911       "Test 4-4-3: mAddedEndOffset should be the last end of added text");
2912   Clear();
2913
2914   /****************************************************************************
2915    * Case 5
2916    ****************************************************************************/
2917
2918   // Replacing text around start of added text (not sure if actually occurs)
2919   MergeWith(TextChangeData(50, 50, 55, false, false));
2920   MergeWith(TextChangeData(48, 52, 49, false, false));
2921   MOZ_ASSERT(mStartOffset == 48,
2922              "Test 5-1-1: mStartOffset should be the smallest offset");
2923   MOZ_ASSERT(
2924       mRemovedEndOffset == 50,
2925       "Test 5-1-2: mRemovedEndOffset should be the the first end of removed "
2926       "text");
2927   MOZ_ASSERT(
2928       mAddedEndOffset == 52,  // 55 + (52 - 49)
2929       "Test 5-1-3: mAddedEndOffset should be the first end of added text with "
2930       "added text length by the new change");
2931   Clear();
2932
2933   // Replacing text around start of replaced text (became shorter) (not sure if
2934   // actually occurs)
2935   MergeWith(TextChangeData(50, 60, 58, false, false));
2936   MergeWith(TextChangeData(43, 50, 48, false, false));
2937   MOZ_ASSERT(mStartOffset == 43,
2938              "Test 5-2-1: mStartOffset should be the smallest offset");
2939   MOZ_ASSERT(
2940       mRemovedEndOffset == 60,
2941       "Test 5-2-2: mRemovedEndOffset should be the the first end of removed "
2942       "text");
2943   MOZ_ASSERT(mAddedEndOffset == 56,  // 58 + (48 - 50)
2944              "Test 5-2-3: mAddedEndOffset should be the first end of added "
2945              "text without "
2946              "removed text length by the new change");
2947   Clear();
2948
2949   // Replacing text around start of replaced text (became longer) (not sure if
2950   // actually occurs)
2951   MergeWith(TextChangeData(50, 60, 68, false, false));
2952   MergeWith(TextChangeData(43, 55, 53, false, false));
2953   MOZ_ASSERT(mStartOffset == 43,
2954              "Test 5-3-1: mStartOffset should be the smallest offset");
2955   MOZ_ASSERT(
2956       mRemovedEndOffset == 60,
2957       "Test 5-3-2: mRemovedEndOffset should be the the first end of removed "
2958       "text");
2959   MOZ_ASSERT(mAddedEndOffset == 66,  // 68 + (53 - 55)
2960              "Test 5-3-3: mAddedEndOffset should be the first end of added "
2961              "text without "
2962              "removed text length by the new change");
2963   Clear();
2964
2965   // Replacing text around start of replaced text (became shorter) (not sure if
2966   // actually occurs)
2967   MergeWith(TextChangeData(50, 60, 58, false, false));
2968   MergeWith(TextChangeData(43, 50, 128, false, false));
2969   MOZ_ASSERT(mStartOffset == 43,
2970              "Test 5-4-1: mStartOffset should be the smallest offset");
2971   MOZ_ASSERT(
2972       mRemovedEndOffset == 60,
2973       "Test 5-4-2: mRemovedEndOffset should be the the first end of removed "
2974       "text");
2975   MOZ_ASSERT(
2976       mAddedEndOffset == 136,  // 58 + (128 - 50)
2977       "Test 5-4-3: mAddedEndOffset should be the first end of added text with "
2978       "added text length by the new change");
2979   Clear();
2980
2981   // Replacing text around start of replaced text (became longer) (not sure if
2982   // actually occurs)
2983   MergeWith(TextChangeData(50, 60, 68, false, false));
2984   MergeWith(TextChangeData(43, 55, 65, false, false));
2985   MOZ_ASSERT(mStartOffset == 43,
2986              "Test 5-5-1: mStartOffset should be the smallest offset");
2987   MOZ_ASSERT(
2988       mRemovedEndOffset == 60,
2989       "Test 5-5-2: mRemovedEndOffset should be the the first end of removed "
2990       "text");
2991   MOZ_ASSERT(
2992       mAddedEndOffset == 78,  // 68 + (65 - 55)
2993       "Test 5-5-3: mAddedEndOffset should be the first end of added text with "
2994       "added text length by the new change");
2995   Clear();
2996
2997   /****************************************************************************
2998    * Case 6
2999    ****************************************************************************/
3000
3001   // Appending text before already added text (not sure if actually occurs)
3002   MergeWith(TextChangeData(30, 30, 45, false, false));
3003   MergeWith(TextChangeData(10, 10, 20, false, false));
3004   MOZ_ASSERT(mStartOffset == 10,
3005              "Test 6-1-1: mStartOffset should be the smallest offset");
3006   MOZ_ASSERT(
3007       mRemovedEndOffset == 30,
3008       "Test 6-1-2: mRemovedEndOffset should be the the largest end of removed "
3009       "text");
3010   MOZ_ASSERT(
3011       mAddedEndOffset == 55,  // 45 + (20 - 10)
3012       "Test 6-1-3: mAddedEndOffset should be the first end of added text with "
3013       "added text length by the new change");
3014   Clear();
3015
3016   // Removing text before already removed text (not sure if actually occurs)
3017   MergeWith(TextChangeData(30, 35, 30, false, false));
3018   MergeWith(TextChangeData(10, 25, 10, false, false));
3019   MOZ_ASSERT(mStartOffset == 10,
3020              "Test 6-2-1: mStartOffset should be the smallest offset");
3021   MOZ_ASSERT(
3022       mRemovedEndOffset == 35,
3023       "Test 6-2-2: mRemovedEndOffset should be the the largest end of removed "
3024       "text");
3025   MOZ_ASSERT(
3026       mAddedEndOffset == 15,  // 30 - (25 - 10)
3027       "Test 6-2-3: mAddedEndOffset should be the first end of added text with "
3028       "removed text length by the new change");
3029   Clear();
3030
3031   // Replacing text before already replaced text (not sure if actually occurs)
3032   MergeWith(TextChangeData(50, 65, 70, false, false));
3033   MergeWith(TextChangeData(13, 24, 15, false, false));
3034   MOZ_ASSERT(mStartOffset == 13,
3035              "Test 6-3-1: mStartOffset should be the smallest offset");
3036   MOZ_ASSERT(
3037       mRemovedEndOffset == 65,
3038       "Test 6-3-2: mRemovedEndOffset should be the the largest end of removed "
3039       "text");
3040   MOZ_ASSERT(mAddedEndOffset == 61,  // 70 + (15 - 24)
3041              "Test 6-3-3: mAddedEndOffset should be the first end of added "
3042              "text without "
3043              "removed text length by the new change");
3044   Clear();
3045
3046   // Replacing text before already replaced text (not sure if actually occurs)
3047   MergeWith(TextChangeData(50, 65, 70, false, false));
3048   MergeWith(TextChangeData(13, 24, 36, false, false));
3049   MOZ_ASSERT(mStartOffset == 13,
3050              "Test 6-4-1: mStartOffset should be the smallest offset");
3051   MOZ_ASSERT(
3052       mRemovedEndOffset == 65,
3053       "Test 6-4-2: mRemovedEndOffset should be the the largest end of removed "
3054       "text");
3055   MOZ_ASSERT(mAddedEndOffset == 82,  // 70 + (36 - 24)
3056              "Test 6-4-3: mAddedEndOffset should be the first end of added "
3057              "text without "
3058              "removed text length by the new change");
3059   Clear();
3060 }
3061
3062 #endif  // #ifdef DEBUG
3063
3064 }  // namespace mozilla::widget
3065
3066 #ifdef DEBUG
3067 //////////////////////////////////////////////////////////////
3068 //
3069 // Convert a GUI event message code to a string.
3070 // Makes it a lot easier to debug events.
3071 //
3072 // See gtk/nsWidget.cpp and windows/nsWindow.cpp
3073 // for a DebugPrintEvent() function that uses
3074 // this.
3075 //
3076 //////////////////////////////////////////////////////////////
3077 /* static */
3078 nsAutoString nsBaseWidget::debug_GuiEventToString(WidgetGUIEvent* aGuiEvent) {
3079   NS_ASSERTION(nullptr != aGuiEvent, "cmon, null gui event.");
3080
3081   nsAutoString eventName(u"UNKNOWN"_ns);
3082
3083 #  define _ASSIGN_eventName(_value, _name) \
3084     case _value:                           \
3085       eventName.AssignLiteral(_name);      \
3086       break
3087
3088   switch (aGuiEvent->mMessage) {
3089     _ASSIGN_eventName(eBlur, "eBlur");
3090     _ASSIGN_eventName(eDrop, "eDrop");
3091     _ASSIGN_eventName(eDragEnter, "eDragEnter");
3092     _ASSIGN_eventName(eDragExit, "eDragExit");
3093     _ASSIGN_eventName(eDragOver, "eDragOver");
3094     _ASSIGN_eventName(eEditorInput, "eEditorInput");
3095     _ASSIGN_eventName(eFocus, "eFocus");
3096     _ASSIGN_eventName(eFocusIn, "eFocusIn");
3097     _ASSIGN_eventName(eFocusOut, "eFocusOut");
3098     _ASSIGN_eventName(eFormSelect, "eFormSelect");
3099     _ASSIGN_eventName(eFormChange, "eFormChange");
3100     _ASSIGN_eventName(eFormReset, "eFormReset");
3101     _ASSIGN_eventName(eFormSubmit, "eFormSubmit");
3102     _ASSIGN_eventName(eImageAbort, "eImageAbort");
3103     _ASSIGN_eventName(eLoadError, "eLoadError");
3104     _ASSIGN_eventName(eKeyDown, "eKeyDown");
3105     _ASSIGN_eventName(eKeyPress, "eKeyPress");
3106     _ASSIGN_eventName(eKeyUp, "eKeyUp");
3107     _ASSIGN_eventName(eMouseEnterIntoWidget, "eMouseEnterIntoWidget");
3108     _ASSIGN_eventName(eMouseExitFromWidget, "eMouseExitFromWidget");
3109     _ASSIGN_eventName(eMouseDown, "eMouseDown");
3110     _ASSIGN_eventName(eMouseUp, "eMouseUp");
3111     _ASSIGN_eventName(eMouseClick, "eMouseClick");
3112     _ASSIGN_eventName(eMouseAuxClick, "eMouseAuxClick");
3113     _ASSIGN_eventName(eMouseDoubleClick, "eMouseDoubleClick");
3114     _ASSIGN_eventName(eMouseMove, "eMouseMove");
3115     _ASSIGN_eventName(eLoad, "eLoad");
3116     _ASSIGN_eventName(ePopState, "ePopState");
3117     _ASSIGN_eventName(eBeforeScriptExecute, "eBeforeScriptExecute");
3118     _ASSIGN_eventName(eAfterScriptExecute, "eAfterScriptExecute");
3119     _ASSIGN_eventName(eUnload, "eUnload");
3120     _ASSIGN_eventName(eHashChange, "eHashChange");
3121     _ASSIGN_eventName(eReadyStateChange, "eReadyStateChange");
3122     _ASSIGN_eventName(eXULBroadcast, "eXULBroadcast");
3123     _ASSIGN_eventName(eXULCommandUpdate, "eXULCommandUpdate");
3124
3125 #  undef _ASSIGN_eventName
3126
3127     default: {
3128       eventName.AssignLiteral("UNKNOWN: ");
3129       eventName.AppendInt(aGuiEvent->mMessage);
3130     } break;
3131   }
3132
3133   return nsAutoString(eventName);
3134 }
3135 //////////////////////////////////////////////////////////////
3136 //
3137 // Code to deal with paint and event debug prefs.
3138 //
3139 //////////////////////////////////////////////////////////////
3140 struct PrefPair {
3141   const char* name;
3142   bool value;
3143 };
3144
3145 static PrefPair debug_PrefValues[] = {
3146     {"nglayout.debug.crossing_event_dumping", false},
3147     {"nglayout.debug.event_dumping", false},
3148     {"nglayout.debug.invalidate_dumping", false},
3149     {"nglayout.debug.motion_event_dumping", false},
3150     {"nglayout.debug.paint_dumping", false},
3151     {"nglayout.debug.paint_flashing", false},
3152     {"nglayout.debug.paint_flashing_chrome", false}};
3153
3154 //////////////////////////////////////////////////////////////
3155 bool nsBaseWidget::debug_GetCachedBoolPref(const char* aPrefName) {
3156   NS_ASSERTION(nullptr != aPrefName, "cmon, pref name is null.");
3157
3158   for (uint32_t i = 0; i < ArrayLength(debug_PrefValues); i++) {
3159     if (strcmp(debug_PrefValues[i].name, aPrefName) == 0) {
3160       return debug_PrefValues[i].value;
3161     }
3162   }
3163
3164   return false;
3165 }
3166 //////////////////////////////////////////////////////////////
3167 static void debug_SetCachedBoolPref(const char* aPrefName, bool aValue) {
3168   NS_ASSERTION(nullptr != aPrefName, "cmon, pref name is null.");
3169
3170   for (uint32_t i = 0; i < ArrayLength(debug_PrefValues); i++) {
3171     if (strcmp(debug_PrefValues[i].name, aPrefName) == 0) {
3172       debug_PrefValues[i].value = aValue;
3173
3174       return;
3175     }
3176   }
3177
3178   NS_ASSERTION(false, "cmon, this code is not reached dude.");
3179 }
3180
3181 //////////////////////////////////////////////////////////////
3182 class Debug_PrefObserver final : public nsIObserver {
3183   ~Debug_PrefObserver() = default;
3184
3185  public:
3186   NS_DECL_ISUPPORTS
3187   NS_DECL_NSIOBSERVER
3188 };
3189
3190 NS_IMPL_ISUPPORTS(Debug_PrefObserver, nsIObserver)
3191
3192 NS_IMETHODIMP
3193 Debug_PrefObserver::Observe(nsISupports* subject, const char* topic,
3194                             const char16_t* data) {
3195   NS_ConvertUTF16toUTF8 prefName(data);
3196
3197   bool value = Preferences::GetBool(prefName.get(), false);
3198   debug_SetCachedBoolPref(prefName.get(), value);
3199   return NS_OK;
3200 }
3201
3202 //////////////////////////////////////////////////////////////
3203 /* static */ void debug_RegisterPrefCallbacks() {
3204   static bool once = true;
3205
3206   if (!once) {
3207     return;
3208   }
3209
3210   once = false;
3211
3212   nsCOMPtr<nsIObserver> obs(new Debug_PrefObserver());
3213   for (uint32_t i = 0; i < ArrayLength(debug_PrefValues); i++) {
3214     // Initialize the pref values
3215     debug_PrefValues[i].value =
3216         Preferences::GetBool(debug_PrefValues[i].name, false);
3217
3218     if (obs) {
3219       // Register callbacks for when these change
3220       nsCString name;
3221       name.AssignLiteral(debug_PrefValues[i].name,
3222                          strlen(debug_PrefValues[i].name));
3223       Preferences::AddStrongObserver(obs, name);
3224     }
3225   }
3226 }
3227 //////////////////////////////////////////////////////////////
3228 static int32_t _GetPrintCount() {
3229   static int32_t sCount = 0;
3230
3231   return ++sCount;
3232 }
3233 //////////////////////////////////////////////////////////////
3234 /* static */
3235 bool nsBaseWidget::debug_WantPaintFlashing() {
3236   return debug_GetCachedBoolPref("nglayout.debug.paint_flashing");
3237 }
3238 //////////////////////////////////////////////////////////////
3239 /* static */
3240 void nsBaseWidget::debug_DumpEvent(FILE* aFileOut, nsIWidget* aWidget,
3241                                    WidgetGUIEvent* aGuiEvent,
3242                                    const char* aWidgetName, int32_t aWindowID) {
3243   if (aGuiEvent->mMessage == eMouseMove) {
3244     if (!debug_GetCachedBoolPref("nglayout.debug.motion_event_dumping")) return;
3245   }
3246
3247   if (aGuiEvent->mMessage == eMouseEnterIntoWidget ||
3248       aGuiEvent->mMessage == eMouseExitFromWidget) {
3249     if (!debug_GetCachedBoolPref("nglayout.debug.crossing_event_dumping"))
3250       return;
3251   }
3252
3253   if (!debug_GetCachedBoolPref("nglayout.debug.event_dumping")) return;
3254
3255   NS_LossyConvertUTF16toASCII tempString(
3256       debug_GuiEventToString(aGuiEvent).get());
3257
3258   fprintf(aFileOut, "%4d %-26s widget=%-8p name=%-12s id=0x%-6x refpt=%d,%d\n",
3259           _GetPrintCount(), tempString.get(), (void*)aWidget, aWidgetName,
3260           aWindowID, aGuiEvent->mRefPoint.x, aGuiEvent->mRefPoint.y);
3261 }
3262 //////////////////////////////////////////////////////////////
3263 /* static */
3264 void nsBaseWidget::debug_DumpPaintEvent(FILE* aFileOut, nsIWidget* aWidget,
3265                                         const nsIntRegion& aRegion,
3266                                         const char* aWidgetName,
3267                                         int32_t aWindowID) {
3268   NS_ASSERTION(nullptr != aFileOut, "cmon, null output FILE");
3269   NS_ASSERTION(nullptr != aWidget, "cmon, the widget is null");
3270
3271   if (!debug_GetCachedBoolPref("nglayout.debug.paint_dumping")) return;
3272
3273   nsIntRect rect = aRegion.GetBounds();
3274   fprintf(aFileOut,
3275           "%4d PAINT      widget=%p name=%-12s id=0x%-6x bounds-rect=%3d,%-3d "
3276           "%3d,%-3d",
3277           _GetPrintCount(), (void*)aWidget, aWidgetName, aWindowID, rect.X(),
3278           rect.Y(), rect.Width(), rect.Height());
3279
3280   fprintf(aFileOut, "\n");
3281 }
3282 //////////////////////////////////////////////////////////////
3283 /* static */
3284 void nsBaseWidget::debug_DumpInvalidate(FILE* aFileOut, nsIWidget* aWidget,
3285                                         const LayoutDeviceIntRect* aRect,
3286                                         const char* aWidgetName,
3287                                         int32_t aWindowID) {
3288   if (!debug_GetCachedBoolPref("nglayout.debug.invalidate_dumping")) return;
3289
3290   NS_ASSERTION(nullptr != aFileOut, "cmon, null output FILE");
3291   NS_ASSERTION(nullptr != aWidget, "cmon, the widget is null");
3292
3293   fprintf(aFileOut, "%4d Invalidate widget=%p name=%-12s id=0x%-6x",
3294           _GetPrintCount(), (void*)aWidget, aWidgetName, aWindowID);
3295
3296   if (aRect) {
3297     fprintf(aFileOut, " rect=%3d,%-3d %3d,%-3d", aRect->X(), aRect->Y(),
3298             aRect->Width(), aRect->Height());
3299   } else {
3300     fprintf(aFileOut, " rect=%-15s", "none");
3301   }
3302
3303   fprintf(aFileOut, "\n");
3304 }
3305 //////////////////////////////////////////////////////////////
3306
3307 #endif  // DEBUG