DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (5350524bb654)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=2 et tw=80 : */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/layers/CompositorBridgeChild.h"
#include "mozilla/layers/CompositorBridgeParent.h"
#include "mozilla/layers/CompositorThread.h"
#include <stddef.h>                     // for size_t
#include "ClientLayerManager.h"         // for ClientLayerManager
#include "base/message_loop.h"          // for MessageLoop
#include "base/task.h"                  // for NewRunnableMethod, etc
#include "gfxPrefs.h"
#include "mozilla/layers/ImageBridgeChild.h"
#include "mozilla/layers/APZChild.h"
#include "mozilla/layers/IAPZCTreeManager.h"
#include "mozilla/layers/APZCTreeManagerChild.h"
#include "mozilla/layers/LayerTransactionChild.h"
#include "mozilla/layers/PLayerTransactionChild.h"
#include "mozilla/layers/TextureClient.h"// for TextureClient
#include "mozilla/layers/TextureClientPool.h"// for TextureClientPool
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/gfx/Logging.h"
#include "mozilla/mozalloc.h"           // for operator new, etc
#include "nsAutoPtr.h"
#include "nsDebug.h"                    // for NS_RUNTIMEABORT
#include "nsIObserver.h"                // for nsIObserver
#include "nsISupportsImpl.h"            // for MOZ_COUNT_CTOR, etc
#include "nsTArray.h"                   // for nsTArray, nsTArray_Impl
#include "nsXULAppAPI.h"                // for XRE_GetIOMessageLoop, etc
#include "FrameLayerBuilder.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/dom/TabParent.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/Unused.h"
#include "mozilla/DebugOnly.h"
#if defined(XP_WIN)
#include "WinUtils.h"
#endif
#include "mozilla/widget/CompositorWidget.h"
#ifdef MOZ_WIDGET_SUPPORTS_OOP_COMPOSITING
# include "mozilla/widget/CompositorWidgetChild.h"
#endif
#include "VsyncSource.h"

using mozilla::layers::LayerTransactionChild;
using mozilla::dom::TabChildBase;
using mozilla::Unused;
using mozilla::gfx::GPUProcessManager;

namespace mozilla {
namespace layers {

static int sShmemCreationCounter = 0;

static void ResetShmemCounter()
{
  sShmemCreationCounter = 0;
}

static void ShmemAllocated(CompositorBridgeChild* aProtocol)
{
  sShmemCreationCounter++;
  if (sShmemCreationCounter > 256) {
    aProtocol->SendSyncWithCompositor();
    ResetShmemCounter();
    MOZ_PERFORMANCE_WARNING("gfx", "The number of shmem allocations is too damn high!");
  }
}

static StaticRefPtr<CompositorBridgeChild> sCompositorBridge;

Atomic<int32_t> KnowsCompositor::sSerialCounter(0);

CompositorBridgeChild::CompositorBridgeChild(LayerManager *aLayerManager)
  : mLayerManager(aLayerManager)
  , mCanSend(false)
  , mFwdTransactionId(0)
  , mMessageLoop(MessageLoop::current())
  , mSectionAllocator(nullptr)
{
  MOZ_ASSERT(NS_IsMainThread());
}

CompositorBridgeChild::~CompositorBridgeChild()
{
  if (mCanSend) {
    gfxCriticalError() << "CompositorBridgeChild was not deinitialized";
  }
}

bool
CompositorBridgeChild::IsSameProcess() const
{
  return OtherPid() == base::GetCurrentProcId();
}

static void DeferredDestroyCompositor(RefPtr<CompositorBridgeParent> aCompositorBridgeParent,
                                      RefPtr<CompositorBridgeChild> aCompositorBridgeChild)
{
  aCompositorBridgeChild->Close();

  if (sCompositorBridge == aCompositorBridgeChild) {
    sCompositorBridge = nullptr;
  }
}

void
CompositorBridgeChild::Destroy()
{
  // This must not be called from the destructor!
  mTexturesWaitingRecycled.Clear();

  if (!mCanSend) {
    return;
  }

  for (size_t i = 0; i < mTexturePools.Length(); i++) {
    mTexturePools[i]->Destroy();
  }

  if (mSectionAllocator) {
    delete mSectionAllocator;
    mSectionAllocator = nullptr;
  }

  // Destroying the layer manager may cause all sorts of things to happen, so
  // let's make sure there is still a reference to keep this alive whatever
  // happens.
  RefPtr<CompositorBridgeChild> selfRef = this;

  if (mLayerManager) {
    mLayerManager->Destroy();
    mLayerManager = nullptr;
  }

  AutoTArray<PLayerTransactionChild*, 16> transactions;
  ManagedPLayerTransactionChild(transactions);
  for (int i = transactions.Length() - 1; i >= 0; --i) {
    RefPtr<LayerTransactionChild> layers =
      static_cast<LayerTransactionChild*>(transactions[i]);
    layers->Destroy();
  }

  const ManagedContainer<PTextureChild>& textures = ManagedPTextureChild();
  for (auto iter = textures.ConstIter(); !iter.Done(); iter.Next()) {
    RefPtr<TextureClient> texture = TextureClient::AsTextureClient(iter.Get()->GetKey());

    if (texture) {
      texture->Destroy();
    }
  }

  SendWillClose();
  mCanSend = false;

  // We no longer care about unexpected shutdowns, in the remote process case.
  mProcessToken = 0;

  // The call just made to SendWillClose can result in IPC from the
  // CompositorBridgeParent to the CompositorBridgeChild (e.g. caused by the destruction
  // of shared memory). We need to ensure this gets processed by the
  // CompositorBridgeChild before it gets destroyed. It suffices to ensure that
  // events already in the MessageLoop get processed before the
  // CompositorBridgeChild is destroyed, so we add a task to the MessageLoop to
  // handle compositor desctruction.

  // From now on we can't send any message message.
  MessageLoop::current()->PostTask(
             NewRunnableFunction(DeferredDestroyCompositor, mCompositorBridgeParent, selfRef));
}

// static
void
CompositorBridgeChild::ShutDown()
{
  if (sCompositorBridge) {
    sCompositorBridge->Destroy();
    do {
      NS_ProcessNextEvent(nullptr, true);
    } while (sCompositorBridge);
  }
}

bool
CompositorBridgeChild::LookupCompositorFrameMetrics(const FrameMetrics::ViewID aId,
                                                    FrameMetrics& aFrame)
{
  SharedFrameMetricsData* data = mFrameMetricsTable.Get(aId);
  if (data) {
    data->CopyFrameMetrics(&aFrame);
    return true;
  }
  return false;
}

/* static */ bool
CompositorBridgeChild::InitForContent(Endpoint<PCompositorBridgeChild>&& aEndpoint)
{
  // There's only one compositor per child process.
  MOZ_ASSERT(!sCompositorBridge);

  RefPtr<CompositorBridgeChild> child(new CompositorBridgeChild(nullptr));
  if (!aEndpoint.Bind(child)) {
    NS_RUNTIMEABORT("Couldn't Open() Compositor channel.");
    return false;
  }
  child->InitIPDL();

  // We release this ref in DeferredDestroyCompositor.
  sCompositorBridge = child;
  return true;
}

/* static */ bool
CompositorBridgeChild::ReinitForContent(Endpoint<PCompositorBridgeChild>&& aEndpoint)
{
  MOZ_ASSERT(NS_IsMainThread());

  if (RefPtr<CompositorBridgeChild> old = sCompositorBridge.forget()) {
    // Note that at this point, ActorDestroy may not have been called yet,
    // meaning mCanSend is still true. In this case we will try to send a
    // synchronous WillClose message to the parent, and will certainly get
    // a false result and a MsgDropped processing error. This is okay.
    old->Destroy();
  }

  return InitForContent(Move(aEndpoint));
}

CompositorBridgeParent*
CompositorBridgeChild::InitSameProcess(widget::CompositorWidget* aWidget,
                                       const uint64_t& aLayerTreeId,
                                       CSSToLayoutDeviceScale aScale,
                                       bool aUseAPZ,
                                       bool aUseExternalSurface,
                                       const gfx::IntSize& aSurfaceSize)
{
  TimeDuration vsyncRate =
    gfxPlatform::GetPlatform()->GetHardwareVsync()->GetGlobalDisplay().GetVsyncRate();

  mCompositorBridgeParent =
    new CompositorBridgeParent(aScale, vsyncRate, aUseExternalSurface, aSurfaceSize);

  bool ok = Open(mCompositorBridgeParent->GetIPCChannel(),
                 CompositorThreadHolder::Loop(),
                 ipc::ChildSide);
  MOZ_RELEASE_ASSERT(ok);

  InitIPDL();
  mCompositorBridgeParent->InitSameProcess(aWidget, aLayerTreeId, aUseAPZ);
  return mCompositorBridgeParent;
}

/* static */ RefPtr<CompositorBridgeChild>
CompositorBridgeChild::CreateRemote(const uint64_t& aProcessToken,
                                    LayerManager* aLayerManager,
                                    Endpoint<PCompositorBridgeChild>&& aEndpoint)
{
  RefPtr<CompositorBridgeChild> child = new CompositorBridgeChild(aLayerManager);
  if (!aEndpoint.Bind(child)) {
    return nullptr;
  }
  child->InitIPDL();
  child->mProcessToken = aProcessToken;
  return child;
}

void
CompositorBridgeChild::InitIPDL()
{
  mCanSend = true;
  AddRef();
}

void
CompositorBridgeChild::DeallocPCompositorBridgeChild()
{
  Release();
}

/*static*/ CompositorBridgeChild*
CompositorBridgeChild::Get()
{
  // This is only expected to be used in child processes.
  MOZ_ASSERT(!XRE_IsParentProcess());
  return sCompositorBridge;
}

// static
bool
CompositorBridgeChild::ChildProcessHasCompositorBridge()
{
  return sCompositorBridge != nullptr;
}

PLayerTransactionChild*
CompositorBridgeChild::AllocPLayerTransactionChild(const nsTArray<LayersBackend>& aBackendHints,
                                                   const uint64_t& aId,
                                                   TextureFactoryIdentifier*,
                                                   bool*)
{
  LayerTransactionChild* c = new LayerTransactionChild(aId);
  c->AddIPDLReference();
  return c;
}

bool
CompositorBridgeChild::DeallocPLayerTransactionChild(PLayerTransactionChild* actor)
{
  uint64_t childId = static_cast<LayerTransactionChild*>(actor)->GetId();

  for (auto iter = mFrameMetricsTable.Iter(); !iter.Done(); iter.Next()) {
    nsAutoPtr<SharedFrameMetricsData>& data = iter.Data();
    if (data->GetLayersId() == childId) {
      iter.Remove();
    }
  }
  static_cast<LayerTransactionChild*>(actor)->ReleaseIPDLReference();
  return true;
}

bool
CompositorBridgeChild::RecvInvalidateLayers(const uint64_t& aLayersId)
{
  if (mLayerManager) {
    MOZ_ASSERT(aLayersId == 0);
    FrameLayerBuilder::InvalidateAllLayers(mLayerManager);
  } else if (aLayersId != 0) {
    if (dom::TabChild* child = dom::TabChild::GetFrom(aLayersId)) {
      child->InvalidateLayers();
    }
  }
  return true;
}

bool
CompositorBridgeChild::RecvCompositorUpdated(const uint64_t& aLayersId,
                                             const TextureFactoryIdentifier& aNewIdentifier)
{
  if (mLayerManager) {
    // This case is handled directly by nsBaseWidget.
    MOZ_ASSERT(aLayersId == 0);
  } else if (aLayersId != 0) {
    if (dom::TabChild* child = dom::TabChild::GetFrom(aLayersId)) {
      child->CompositorUpdated(aNewIdentifier);

      // If we still get device reset here, something must wrong when creating
      // d3d11 devices.
      if (gfxPlatform::GetPlatform()->DidRenderingDeviceReset()) {
        gfxCriticalError() << "Unexpected reset device processing when \
                               updating compositor.";
      }
    }
    if (!mCanSend) {
      return true;
    }
    SendAcknowledgeCompositorUpdate(aLayersId);
  }
  return true;
}

#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
static void CalculatePluginClip(const LayoutDeviceIntRect& aBounds,
                                const nsTArray<LayoutDeviceIntRect>& aPluginClipRects,
                                const LayoutDeviceIntPoint& aContentOffset,
                                const LayoutDeviceIntRegion& aParentLayerVisibleRegion,
                                nsTArray<LayoutDeviceIntRect>& aResult,
                                LayoutDeviceIntRect& aVisibleBounds,
                                bool& aPluginIsVisible)
{
  aPluginIsVisible = true;
  LayoutDeviceIntRegion contentVisibleRegion;
  // aPluginClipRects (plugin widget origin) - contains *visible* rects
  for (uint32_t idx = 0; idx < aPluginClipRects.Length(); idx++) {
    LayoutDeviceIntRect rect = aPluginClipRects[idx];
    // shift to content origin
    rect.MoveBy(aBounds.x, aBounds.y);
    // accumulate visible rects
    contentVisibleRegion.OrWith(rect);
  }
  // apply layers clip (window origin)
  LayoutDeviceIntRegion region = aParentLayerVisibleRegion;
  region.MoveBy(-aContentOffset.x, -aContentOffset.y);
  contentVisibleRegion.AndWith(region);
  if (contentVisibleRegion.IsEmpty()) {
    aPluginIsVisible = false;
    return;
  }
  // shift to plugin widget origin
  contentVisibleRegion.MoveBy(-aBounds.x, -aBounds.y);
  for (auto iter = contentVisibleRegion.RectIter(); !iter.Done(); iter.Next()) {
    const LayoutDeviceIntRect& rect = iter.Get();
    aResult.AppendElement(rect);
    aVisibleBounds.UnionRect(aVisibleBounds, rect);
  }
}
#endif

bool
CompositorBridgeChild::RecvUpdatePluginConfigurations(const LayoutDeviceIntPoint& aContentOffset,
                                                      const LayoutDeviceIntRegion& aParentLayerVisibleRegion,
                                                      nsTArray<PluginWindowData>&& aPlugins)
{
#if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
  NS_NOTREACHED("CompositorBridgeChild::RecvUpdatePluginConfigurations calls "
                "unexpected on this platform.");
  return false;
#else
  // Now that we are on the main thread, update plugin widget config.
  // This should happen a little before we paint to the screen assuming
  // the main thread is running freely.
  DebugOnly<nsresult> rv;
  MOZ_ASSERT(NS_IsMainThread());

  // Tracks visible plugins we update, so we can hide any plugins we don't.
  nsTArray<uintptr_t> visiblePluginIds;
  nsIWidget* parent = nullptr;
  for (uint32_t pluginsIdx = 0; pluginsIdx < aPlugins.Length(); pluginsIdx++) {
    nsIWidget* widget =
      nsIWidget::LookupRegisteredPluginWindow(aPlugins[pluginsIdx].windowId());
    if (!widget) {
      NS_WARNING("Unexpected, plugin id not found!");
      continue;
    }
    if (!parent) {
      parent = widget->GetParent();
    }
    bool isVisible = aPlugins[pluginsIdx].visible();
    if (widget && !widget->Destroyed()) {
      LayoutDeviceIntRect bounds;
      LayoutDeviceIntRect visibleBounds;
      // If the plugin is visible update it's geometry.
      if (isVisible) {
        // Set bounds (content origin)
        bounds = aPlugins[pluginsIdx].bounds();
        nsTArray<LayoutDeviceIntRect> rectsOut;
        // This call may change the value of isVisible
        CalculatePluginClip(bounds, aPlugins[pluginsIdx].clip(),
                            aContentOffset,
                            aParentLayerVisibleRegion,
                            rectsOut, visibleBounds, isVisible);
        // content clipping region (widget origin)
        rv = widget->SetWindowClipRegion(rectsOut, false);
        NS_ASSERTION(NS_SUCCEEDED(rv), "widget call failure");
        // This will trigger a browser window paint event for areas uncovered
        // by a child window move, and will call invalidate on the plugin
        // parent window which the browser owns. The latter gets picked up in
        // our OnPaint handler and forwarded over to the plugin process async.
        rv = widget->Resize(aContentOffset.x + bounds.x,
                            aContentOffset.y + bounds.y,
                            bounds.width, bounds.height, true);
        NS_ASSERTION(NS_SUCCEEDED(rv), "widget call failure");
      }

      rv = widget->Enable(isVisible);
      NS_ASSERTION(NS_SUCCEEDED(rv), "widget call failure");

      // visible state - updated after clipping, prior to invalidating
      rv = widget->Show(isVisible);
      NS_ASSERTION(NS_SUCCEEDED(rv), "widget call failure");

      // Handle invalidation, this can be costly, avoid if it is not needed.
      if (isVisible) {
        // invalidate region (widget origin)
#if defined(XP_WIN)
        // Work around for flash's crummy sandbox. See bug 762948. This call
        // digs down into the window hirearchy, invalidating regions on
        // windows owned by other processes.
        mozilla::widget::WinUtils::InvalidatePluginAsWorkaround(
          widget, visibleBounds);
#else
        rv = widget->Invalidate(visibleBounds);
        NS_ASSERTION(NS_SUCCEEDED(rv), "widget call failure");
#endif
        visiblePluginIds.AppendElement(aPlugins[pluginsIdx].windowId());
      }
    }
  }
  // Any plugins we didn't update need to be hidden, as they are
  // not associated with visible content.
  nsIWidget::UpdateRegisteredPluginWindowVisibility((uintptr_t)parent, visiblePluginIds);
  if (!mCanSend) {
    return true;
  }
  SendRemotePluginsReady();
  return true;
#endif // !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
}

#if defined(XP_WIN)
static void
ScheduleSendAllPluginsCaptured(CompositorBridgeChild* aThis, MessageLoop* aLoop)
{
  aLoop->PostTask(NewNonOwningRunnableMethod(
    aThis, &CompositorBridgeChild::SendAllPluginsCaptured));
}
#endif

bool
CompositorBridgeChild::RecvCaptureAllPlugins(const uintptr_t& aParentWidget)
{
#if defined(XP_WIN)
  MOZ_ASSERT(NS_IsMainThread());
  nsIWidget::CaptureRegisteredPlugins(aParentWidget);

  // Bounce the call to SendAllPluginsCaptured off the ImageBridgeChild loop,
  // to make sure that the image updates on that thread have been processed.
  ImageBridgeChild::GetSingleton()->GetMessageLoop()->PostTask(
    NewRunnableFunction(&ScheduleSendAllPluginsCaptured, this,
                        MessageLoop::current()));
  return true;
#else
  MOZ_ASSERT_UNREACHABLE(
    "CompositorBridgeChild::RecvCaptureAllPlugins calls unexpected.");
  return false;
#endif
}

bool
CompositorBridgeChild::RecvHideAllPlugins(const uintptr_t& aParentWidget)
{
#if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
  NS_NOTREACHED("CompositorBridgeChild::RecvHideAllPlugins calls "
                "unexpected on this platform.");
  return false;
#else
  MOZ_ASSERT(NS_IsMainThread());
  nsTArray<uintptr_t> list;
  nsIWidget::UpdateRegisteredPluginWindowVisibility(aParentWidget, list);
  if (!mCanSend) {
    return true;
  }
  SendRemotePluginsReady();
  return true;
#endif // !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
}

bool
CompositorBridgeChild::RecvDidComposite(const uint64_t& aId, const uint64_t& aTransactionId,
                                        const TimeStamp& aCompositeStart,
                                        const TimeStamp& aCompositeEnd)
{
  // Hold a reference to keep texture pools alive.  See bug 1387799
  AutoTArray<RefPtr<TextureClientPool>,2> texturePools = mTexturePools;

  if (mLayerManager) {
    MOZ_ASSERT(aId == 0);
    RefPtr<ClientLayerManager> m = mLayerManager->AsClientLayerManager();
    MOZ_ASSERT(m);
    m->DidComposite(aTransactionId, aCompositeStart, aCompositeEnd);
  } else if (aId != 0) {
    RefPtr<dom::TabChild> child = dom::TabChild::GetFrom(aId);
    if (child) {
      child->DidComposite(aTransactionId, aCompositeStart, aCompositeEnd);
    }
  }

  for (size_t i = 0; i < texturePools.Length(); i++) {
    texturePools[i]->ReturnDeferredClients();
  }

  return true;
}

bool
CompositorBridgeChild::RecvOverfill(const uint32_t &aOverfill)
{
  for (size_t i = 0; i < mOverfillObservers.Length(); i++) {
    mOverfillObservers[i]->RunOverfillCallback(aOverfill);
  }
  mOverfillObservers.Clear();
  return true;
}

void
CompositorBridgeChild::AddOverfillObserver(ClientLayerManager* aLayerManager)
{
  MOZ_ASSERT(aLayerManager);
  mOverfillObservers.AppendElement(aLayerManager);
}

bool
CompositorBridgeChild::RecvClearCachedResources(const uint64_t& aId)
{
  dom::TabChild* child = dom::TabChild::GetFrom(aId);
  if (child) {
    child->ClearCachedResources();
  }
  return true;
}

void
CompositorBridgeChild::ActorDestroy(ActorDestroyReason aWhy)
{
  if (aWhy == AbnormalShutdown) {
    // If the parent side runs into a problem then the actor will be destroyed.
    // There is nothing we can do in the child side, here sets mCanSend as false.
    gfxCriticalNote << "Receive IPC close with reason=AbnormalShutdown";
  }

  mCanSend = false;

  if (mProcessToken && XRE_IsParentProcess()) {
    GPUProcessManager::Get()->NotifyRemoteActorDestroyed(mProcessToken);
  }
}

bool
CompositorBridgeChild::RecvSharedCompositorFrameMetrics(
    const mozilla::ipc::SharedMemoryBasic::Handle& metrics,
    const CrossProcessMutexHandle& handle,
    const uint64_t& aLayersId,
    const uint32_t& aAPZCId)
{
  SharedFrameMetricsData* data = new SharedFrameMetricsData(
    metrics, handle, aLayersId, aAPZCId);
  mFrameMetricsTable.Put(data->GetViewID(), data);
  return true;
}

bool
CompositorBridgeChild::RecvReleaseSharedCompositorFrameMetrics(
    const ViewID& aId,
    const uint32_t& aAPZCId)
{
  SharedFrameMetricsData* data = mFrameMetricsTable.Get(aId);
  // The SharedFrameMetricsData may have been removed previously if
  // a SharedFrameMetricsData with the same ViewID but later APZCId had
  // been store and over wrote it.
  if (data && (data->GetAPZCId() == aAPZCId)) {
    mFrameMetricsTable.Remove(aId);
  }
  return true;
}

CompositorBridgeChild::SharedFrameMetricsData::SharedFrameMetricsData(
    const ipc::SharedMemoryBasic::Handle& metrics,
    const CrossProcessMutexHandle& handle,
    const uint64_t& aLayersId,
    const uint32_t& aAPZCId)
  : mMutex(nullptr)
  , mLayersId(aLayersId)
  , mAPZCId(aAPZCId)
{
  mBuffer = new ipc::SharedMemoryBasic;
  mBuffer->SetHandle(metrics);
  mBuffer->Map(sizeof(FrameMetrics));
  mMutex = new CrossProcessMutex(handle);
  MOZ_COUNT_CTOR(SharedFrameMetricsData);
}

CompositorBridgeChild::SharedFrameMetricsData::~SharedFrameMetricsData()
{
  // When the hash table deletes the class, delete
  // the shared memory and mutex.
  delete mMutex;
  mBuffer = nullptr;
  MOZ_COUNT_DTOR(SharedFrameMetricsData);
}

void
CompositorBridgeChild::SharedFrameMetricsData::CopyFrameMetrics(FrameMetrics* aFrame)
{
  FrameMetrics* frame = static_cast<FrameMetrics*>(mBuffer->memory());
  MOZ_ASSERT(frame);
  mMutex->Lock();
  *aFrame = *frame;
  mMutex->Unlock();
}

FrameMetrics::ViewID
CompositorBridgeChild::SharedFrameMetricsData::GetViewID()
{
  FrameMetrics* frame = static_cast<FrameMetrics*>(mBuffer->memory());
  MOZ_ASSERT(frame);
  // Not locking to read of mScrollId since it should not change after being
  // initially set.
  return frame->GetScrollId();
}

uint64_t
CompositorBridgeChild::SharedFrameMetricsData::GetLayersId() const
{
  return mLayersId;
}

uint32_t
CompositorBridgeChild::SharedFrameMetricsData::GetAPZCId()
{
  return mAPZCId;
}


bool
CompositorBridgeChild::RecvRemotePaintIsReady()
{
  // Used on the content thread, this bounces the message to the
  // TabParent (via the TabChild) if the notification was previously requested.
  // XPCOM gives a soup of compiler errors when trying to do_QueryReference
  // so I'm using static_cast<>
  MOZ_LAYERS_LOG(("[RemoteGfx] CompositorBridgeChild received RemotePaintIsReady"));
  RefPtr<nsISupports> iTabChildBase(do_QueryReferent(mWeakTabChild));
  if (!iTabChildBase) {
    MOZ_LAYERS_LOG(("[RemoteGfx] Note: TabChild was released before RemotePaintIsReady. "
        "MozAfterRemotePaint will not be sent to listener."));
    return true;
  }
  TabChildBase* tabChildBase = static_cast<TabChildBase*>(iTabChildBase.get());
  TabChild* tabChild = static_cast<TabChild*>(tabChildBase);
  MOZ_ASSERT(tabChild);
  Unused << tabChild->SendRemotePaintIsReady();
  mWeakTabChild = nullptr;
  return true;
}


void
CompositorBridgeChild::RequestNotifyAfterRemotePaint(TabChild* aTabChild)
{
  MOZ_ASSERT(aTabChild, "NULL TabChild not allowed in CompositorBridgeChild::RequestNotifyAfterRemotePaint");
  mWeakTabChild = do_GetWeakReference( static_cast<dom::TabChildBase*>(aTabChild) );
  if (!mCanSend) {
    return;
  }
  Unused << SendRequestNotifyAfterRemotePaint();
}

void
CompositorBridgeChild::CancelNotifyAfterRemotePaint(TabChild* aTabChild)
{
  RefPtr<nsISupports> iTabChildBase(do_QueryReferent(mWeakTabChild));
  if (!iTabChildBase) {
    return;
  }
  TabChildBase* tabChildBase = static_cast<TabChildBase*>(iTabChildBase.get());
  TabChild* tabChild = static_cast<TabChild*>(tabChildBase);
  if (tabChild == aTabChild) {
    mWeakTabChild = nullptr;
  }
}

bool
CompositorBridgeChild::SendWillClose()
{
  MOZ_RELEASE_ASSERT(mCanSend);
  return PCompositorBridgeChild::SendWillClose();
}

bool
CompositorBridgeChild::SendPause()
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendPause();
}

bool
CompositorBridgeChild::SendResume()
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendResume();
}

bool
CompositorBridgeChild::SendNotifyChildCreated(const uint64_t& id)
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendNotifyChildCreated(id);
}

bool
CompositorBridgeChild::SendAdoptChild(const uint64_t& id)
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendAdoptChild(id);
}

bool
CompositorBridgeChild::SendMakeSnapshot(const SurfaceDescriptor& inSnapshot, const gfx::IntRect& dirtyRect)
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendMakeSnapshot(inSnapshot, dirtyRect);
}

bool
CompositorBridgeChild::SendFlushRendering()
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendFlushRendering();
}

bool
CompositorBridgeChild::SendStartFrameTimeRecording(const int32_t& bufferSize, uint32_t* startIndex)
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendStartFrameTimeRecording(bufferSize, startIndex);
}

bool
CompositorBridgeChild::SendStopFrameTimeRecording(const uint32_t& startIndex, nsTArray<float>* intervals)
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendStopFrameTimeRecording(startIndex, intervals);
}

bool
CompositorBridgeChild::SendNotifyRegionInvalidated(const nsIntRegion& region)
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendNotifyRegionInvalidated(region);
}

bool
CompositorBridgeChild::SendRequestNotifyAfterRemotePaint()
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendRequestNotifyAfterRemotePaint();
}

bool
CompositorBridgeChild::SendClearApproximatelyVisibleRegions(uint64_t aLayersId,
                                                            uint32_t aPresShellId)
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendClearApproximatelyVisibleRegions(aLayersId,
                                                                aPresShellId);
}

bool
CompositorBridgeChild::SendNotifyApproximatelyVisibleRegion(const ScrollableLayerGuid& aGuid,
                                                            const CSSIntRegion& aRegion)
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendNotifyApproximatelyVisibleRegion(aGuid, aRegion);
}

bool
CompositorBridgeChild::SendAllPluginsCaptured()
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::SendAllPluginsCaptured();
}

PTextureChild*
CompositorBridgeChild::AllocPTextureChild(const SurfaceDescriptor&,
                                          const LayersBackend&,
                                          const TextureFlags&,
                                          const uint64_t&,
                                          const uint64_t& aSerial)
{
  return TextureClient::CreateIPDLActor();
}

bool
CompositorBridgeChild::DeallocPTextureChild(PTextureChild* actor)
{
  return TextureClient::DestroyIPDLActor(actor);
}

bool
CompositorBridgeChild::RecvParentAsyncMessages(InfallibleTArray<AsyncParentMessageData>&& aMessages)
{
  for (AsyncParentMessageArray::index_type i = 0; i < aMessages.Length(); ++i) {
    const AsyncParentMessageData& message = aMessages[i];

    switch (message.type()) {
      case AsyncParentMessageData::TOpNotifyNotUsed: {
        const OpNotifyNotUsed& op = message.get_OpNotifyNotUsed();
        NotifyNotUsed(op.TextureId(), op.fwdTransactionId());
        break;
      }
      default:
        NS_ERROR("unknown AsyncParentMessageData type");
        return false;
    }
  }
  return true;
}

bool
CompositorBridgeChild::RecvObserveLayerUpdate(const uint64_t& aLayersId,
                                              const uint64_t& aEpoch,
                                              const bool& aActive)
{
  // This message is sent via the window compositor, not the tab compositor -
  // however it still has a layers id.
  MOZ_ASSERT(aLayersId);
  MOZ_ASSERT(XRE_IsParentProcess());

  if (RefPtr<dom::TabParent> tab = dom::TabParent::GetTabParentFromLayersId(aLayersId)) {
    tab->LayerTreeUpdate(aEpoch, aActive);
  }
  return true;
}

void
CompositorBridgeChild::HoldUntilCompositableRefReleasedIfNecessary(TextureClient* aClient)
{
  if (!aClient) {
    return;
  }

  if (!(aClient->GetFlags() & TextureFlags::RECYCLE)) {
    return;
  }

  aClient->SetLastFwdTransactionId(GetFwdTransactionId());
  mTexturesWaitingRecycled.Put(aClient->GetSerial(), aClient);
}

void
CompositorBridgeChild::NotifyNotUsed(uint64_t aTextureId, uint64_t aFwdTransactionId)
{
  RefPtr<TextureClient> client = mTexturesWaitingRecycled.Get(aTextureId);
  if (!client) {
    return;
  }
  if (aFwdTransactionId < client->GetLastFwdTransactionId()) {
    // Released on host side, but client already requested newer use texture.
    return;
  }
  mTexturesWaitingRecycled.Remove(aTextureId);
}

void
CompositorBridgeChild::CancelWaitForRecycle(uint64_t aTextureId)
{
  RefPtr<TextureClient> client = mTexturesWaitingRecycled.Get(aTextureId);
  if (!client) {
    return;
  }
  mTexturesWaitingRecycled.Remove(aTextureId);
}

TextureClientPool*
CompositorBridgeChild::GetTexturePool(KnowsCompositor* aAllocator,
                                      SurfaceFormat aFormat,
                                      TextureFlags aFlags)
{
  for (size_t i = 0; i < mTexturePools.Length(); i++) {
    if (mTexturePools[i]->GetBackend() == aAllocator->GetCompositorBackendType() &&
        mTexturePools[i]->GetMaxTextureSize() == aAllocator->GetMaxTextureSize() &&
        mTexturePools[i]->GetFormat() == aFormat &&
        mTexturePools[i]->GetFlags() == aFlags) {
      return mTexturePools[i];
    }
  }

  mTexturePools.AppendElement(
      new TextureClientPool(aAllocator->GetCompositorBackendType(),
                            aAllocator->GetMaxTextureSize(),
                            aFormat,
                            gfx::gfxVars::TileSize(),
                            aFlags,
                            gfxPrefs::LayersTilePoolShrinkTimeout(),
                            gfxPrefs::LayersTilePoolClearTimeout(),
                            gfxPrefs::LayersTileInitialPoolSize(),
                            gfxPrefs::LayersTilePoolUnusedSize(),
                            this));

  return mTexturePools.LastElement();
}

void
CompositorBridgeChild::HandleMemoryPressure()
{
  for (size_t i = 0; i < mTexturePools.Length(); i++) {
    mTexturePools[i]->Clear();
  }
}

void
CompositorBridgeChild::ClearTexturePool()
{
  for (size_t i = 0; i < mTexturePools.Length(); i++) {
    mTexturePools[i]->Clear();
  }
}

FixedSizeSmallShmemSectionAllocator*
CompositorBridgeChild::GetTileLockAllocator()
{
  MOZ_ASSERT(IPCOpen());
  if (!IPCOpen()) {
    return nullptr;
  }

  if (!mSectionAllocator) {
    mSectionAllocator = new FixedSizeSmallShmemSectionAllocator(this);
  }
  return mSectionAllocator;
}


PTextureChild*
CompositorBridgeChild::CreateTexture(const SurfaceDescriptor& aSharedData,
                                     LayersBackend aLayersBackend,
                                     TextureFlags aFlags,
                                     uint64_t aSerial)
{
  return PCompositorBridgeChild::SendPTextureConstructor(aSharedData, aLayersBackend, aFlags, 0 /* FIXME? */, aSerial);
}

bool
CompositorBridgeChild::AllocUnsafeShmem(size_t aSize,
                                   ipc::SharedMemory::SharedMemoryType aType,
                                   ipc::Shmem* aShmem)
{
  ShmemAllocated(this);
  return PCompositorBridgeChild::AllocUnsafeShmem(aSize, aType, aShmem);
}

bool
CompositorBridgeChild::AllocShmem(size_t aSize,
                             ipc::SharedMemory::SharedMemoryType aType,
                             ipc::Shmem* aShmem)
{
  ShmemAllocated(this);
  return PCompositorBridgeChild::AllocShmem(aSize, aType, aShmem);
}

bool
CompositorBridgeChild::DeallocShmem(ipc::Shmem& aShmem)
{
  if (!mCanSend) {
    return false;
  }
  return PCompositorBridgeChild::DeallocShmem(aShmem);
}

widget::PCompositorWidgetChild*
CompositorBridgeChild::AllocPCompositorWidgetChild(const CompositorWidgetInitData& aInitData)
{
  // We send the constructor manually.
  MOZ_CRASH("Should not be called");
  return nullptr;
}

bool
CompositorBridgeChild::DeallocPCompositorWidgetChild(PCompositorWidgetChild* aActor)
{
#ifdef MOZ_WIDGET_SUPPORTS_OOP_COMPOSITING
  delete aActor;
  return true;
#else
  return false;
#endif
}

RefPtr<IAPZCTreeManager>
CompositorBridgeChild::GetAPZCTreeManager(uint64_t aLayerTreeId)
{
  bool apzEnabled = false;
  Unused << SendAsyncPanZoomEnabled(aLayerTreeId, &apzEnabled);

  if (!apzEnabled) {
    return nullptr;
  }

  PAPZCTreeManagerChild* child = SendPAPZCTreeManagerConstructor(aLayerTreeId);
  if (!child) {
    return nullptr;
  }
  APZCTreeManagerChild* parent = static_cast<APZCTreeManagerChild*>(child);

  return RefPtr<IAPZCTreeManager>(parent);
}

PAPZCTreeManagerChild*
CompositorBridgeChild::AllocPAPZCTreeManagerChild(const uint64_t& aLayersId)
{
  APZCTreeManagerChild* child = new APZCTreeManagerChild();
  child->AddRef();
  return child;
}

PAPZChild*
CompositorBridgeChild::AllocPAPZChild(const uint64_t& aLayersId)
{
  // We send the constructor manually.
  MOZ_CRASH("Should not be called");
  return nullptr;
}

bool
CompositorBridgeChild::DeallocPAPZChild(PAPZChild* aActor)
{
  delete aActor;
  return true;
}

bool
CompositorBridgeChild::DeallocPAPZCTreeManagerChild(PAPZCTreeManagerChild* aActor)
{
  APZCTreeManagerChild* parent = static_cast<APZCTreeManagerChild*>(aActor);
  parent->Release();
  return true;
}

void
CompositorBridgeChild::ProcessingError(Result aCode, const char* aReason)
{
  if (aCode != MsgDropped) {
    gfxDevCrash(gfx::LogReason::ProcessingError) << "Processing error in CompositorBridgeChild: " << int(aCode);
  }
}

void
CompositorBridgeChild::WillEndTransaction()
{
  ResetShmemCounter();
}

void
CompositorBridgeChild::HandleFatalError(const char* aName, const char* aMsg) const
{
  dom::ContentChild::FatalErrorIfNotUsingGPUProcess(aName, aMsg, OtherPid());
}

} // namespace layers
} // namespace mozilla