summaryrefslogtreecommitdiffstats
path: root/gfx/layers/ipc/CanvasChild.cpp
blob: a25d5e6799d5783c481d8e4f559ff6af9dced27b (plain)
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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 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 "CanvasChild.h"

#include "MainThreadUtils.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRef.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "mozilla/gfx/CanvasManagerChild.h"
#include "mozilla/gfx/DrawTargetRecording.h"
#include "mozilla/gfx/Tools.h"
#include "mozilla/gfx/Rect.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/ipc/Endpoint.h"
#include "mozilla/ipc/ProcessChild.h"
#include "mozilla/layers/CanvasDrawEventRecorder.h"
#include "mozilla/layers/ImageDataSerializer.h"
#include "mozilla/layers/SourceSurfaceSharedData.h"
#include "mozilla/Maybe.h"
#include "mozilla/Mutex.h"
#include "nsIObserverService.h"
#include "RecordedCanvasEventImpl.h"

namespace mozilla {
namespace layers {

class RecorderHelpers final : public CanvasDrawEventRecorder::Helpers {
 public:
  NS_DECL_OWNINGTHREAD

  explicit RecorderHelpers(const RefPtr<CanvasChild>& aCanvasChild)
      : mCanvasChild(aCanvasChild) {}

  ~RecorderHelpers() override = default;

  bool InitTranslator(TextureType aTextureType, TextureType aWebglTextureType,
                      gfx::BackendType aBackendType, Handle&& aReadHandle,
                      nsTArray<Handle>&& aBufferHandles, uint64_t aBufferSize,
                      CrossProcessSemaphoreHandle&& aReaderSem,
                      CrossProcessSemaphoreHandle&& aWriterSem) override {
    NS_ASSERT_OWNINGTHREAD(RecorderHelpers);
    if (NS_WARN_IF(!mCanvasChild)) {
      return false;
    }
    return mCanvasChild->SendInitTranslator(
        aTextureType, aWebglTextureType, aBackendType, std::move(aReadHandle),
        std::move(aBufferHandles), aBufferSize, std::move(aReaderSem),
        std::move(aWriterSem));
  }

  bool AddBuffer(Handle&& aBufferHandle, uint64_t aBufferSize) override {
    NS_ASSERT_OWNINGTHREAD(RecorderHelpers);
    if (!mCanvasChild) {
      return false;
    }
    return mCanvasChild->SendAddBuffer(std::move(aBufferHandle), aBufferSize);
  }

  bool ReaderClosed() override {
    NS_ASSERT_OWNINGTHREAD(RecorderHelpers);
    if (!mCanvasChild) {
      return false;
    }
    return !mCanvasChild->CanSend() || ipc::ProcessChild::ExpectingShutdown();
  }

  bool RestartReader() override {
    NS_ASSERT_OWNINGTHREAD(RecorderHelpers);
    if (!mCanvasChild) {
      return false;
    }
    return mCanvasChild->SendRestartTranslation();
  }

 private:
  const WeakPtr<CanvasChild> mCanvasChild;
};

class SourceSurfaceCanvasRecording final : public gfx::SourceSurface {
 public:
  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(SourceSurfaceCanvasRecording, final)

  SourceSurfaceCanvasRecording(
      int64_t aTextureId, const RefPtr<gfx::SourceSurface>& aRecordedSuface,
      CanvasChild* aCanvasChild,
      const RefPtr<CanvasDrawEventRecorder>& aRecorder)
      : mTextureId(aTextureId),
        mRecordedSurface(aRecordedSuface),
        mCanvasChild(aCanvasChild),
        mRecorder(aRecorder) {
    // It's important that AddStoredObject is called first because that will
    // run any pending processing required by recorded objects that have been
    // deleted off the main thread.
    mRecorder->AddStoredObject(this);
    mRecorder->RecordEvent(RecordedAddSurfaceAlias(this, aRecordedSuface));
  }

  ~SourceSurfaceCanvasRecording() {
    ReferencePtr surfaceAlias = this;
    if (NS_IsMainThread()) {
      ReleaseOnMainThread(std::move(mRecorder), surfaceAlias,
                          std::move(mRecordedSurface), std::move(mCanvasChild));
      return;
    }

    mRecorder->AddPendingDeletion(
        [recorder = std::move(mRecorder), surfaceAlias,
         aliasedSurface = std::move(mRecordedSurface),
         canvasChild = std::move(mCanvasChild)]() mutable -> void {
          ReleaseOnMainThread(std::move(recorder), surfaceAlias,
                              std::move(aliasedSurface),
                              std::move(canvasChild));
        });
  }

  gfx::SurfaceType GetType() const final { return mRecordedSurface->GetType(); }

  gfx::IntSize GetSize() const final { return mRecordedSurface->GetSize(); }

  gfx::SurfaceFormat GetFormat() const final {
    return mRecordedSurface->GetFormat();
  }

  already_AddRefed<gfx::DataSourceSurface> GetDataSurface() final {
    EnsureDataSurfaceOnMainThread();
    return do_AddRef(mDataSourceSurface);
  }

  void AttachSurface() { mDetached = false; }
  void DetachSurface() { mDetached = true; }

  void InvalidateDataSurface() {
    if (mDataSourceSurface && mMayInvalidate) {
      // This must be the only reference to the data left.
      MOZ_ASSERT(mDataSourceSurface->hasOneRef());
      mDataSourceSurface =
          gfx::Factory::CopyDataSourceSurface(mDataSourceSurface);
      mMayInvalidate = false;
    }
  }

  already_AddRefed<gfx::SourceSurface> ExtractSubrect(
      const gfx::IntRect& aRect) final {
    return mRecordedSurface->ExtractSubrect(aRect);
  }

 private:
  void EnsureDataSurfaceOnMainThread() {
    // The data can only be retrieved on the main thread.
    if (!mDataSourceSurface && NS_IsMainThread()) {
      mDataSourceSurface = mCanvasChild->GetDataSurface(
          mTextureId, mRecordedSurface, mDetached, mMayInvalidate);
    }
  }

  // Used to ensure that clean-up that requires it is done on the main thread.
  static void ReleaseOnMainThread(RefPtr<CanvasDrawEventRecorder> aRecorder,
                                  ReferencePtr aSurfaceAlias,
                                  RefPtr<gfx::SourceSurface> aAliasedSurface,
                                  RefPtr<CanvasChild> aCanvasChild) {
    MOZ_ASSERT(NS_IsMainThread());

    aRecorder->RemoveStoredObject(aSurfaceAlias);
    aRecorder->RecordEvent(RecordedRemoveSurfaceAlias(aSurfaceAlias));
    aAliasedSurface = nullptr;
    aCanvasChild = nullptr;
    aRecorder = nullptr;
  }

  int64_t mTextureId;
  RefPtr<gfx::SourceSurface> mRecordedSurface;
  RefPtr<CanvasChild> mCanvasChild;
  RefPtr<CanvasDrawEventRecorder> mRecorder;
  RefPtr<gfx::DataSourceSurface> mDataSourceSurface;
  bool mDetached = false;
  bool mMayInvalidate = false;
};

class CanvasDataShmemHolder {
 public:
  CanvasDataShmemHolder(ipc::SharedMemoryBasic* aShmem,
                        CanvasChild* aCanvasChild)
      : mMutex("CanvasChild::DataShmemHolder::mMutex"),
        mShmem(aShmem),
        mCanvasChild(aCanvasChild) {}

  bool Init(dom::ThreadSafeWorkerRef* aWorkerRef) {
    if (!aWorkerRef) {
      return true;
    }

    RefPtr<dom::StrongWorkerRef> workerRef = dom::StrongWorkerRef::Create(
        aWorkerRef->Private(), "CanvasChild::DataShmemHolder",
        [this]() { DestroyWorker(); });
    if (NS_WARN_IF(!workerRef)) {
      return false;
    }

    MutexAutoLock lock(mMutex);
    mWorkerRef = new dom::ThreadSafeWorkerRef(workerRef);
    return true;
  }

  void Destroy() {
    class DestroyRunnable final : public dom::WorkerRunnable {
     public:
      DestroyRunnable(dom::WorkerPrivate* aWorkerPrivate,
                      CanvasDataShmemHolder* aShmemHolder)
          : dom::WorkerRunnable(aWorkerPrivate,
                                "CanvasDataShmemHolder::Destroy",
                                dom::WorkerRunnable::WorkerThread),
            mShmemHolder(aShmemHolder) {}

      bool WorkerRun(JSContext* aCx,
                     dom::WorkerPrivate* aWorkerPrivate) override {
        mShmemHolder->Destroy();
        return true;
      }

      void PostRun(JSContext* aCx, dom::WorkerPrivate* aWorkerPrivate,
                   bool aRunResult) override {}

      bool PreDispatch(dom::WorkerPrivate* aWorkerPrivate) override {
        return true;
      }

      void PostDispatch(dom::WorkerPrivate* aWorkerPrivate,
                        bool aDispatchResult) override {}

     private:
      CanvasDataShmemHolder* mShmemHolder;
    };

    mMutex.Lock();

    if (mCanvasChild) {
      if (mWorkerRef) {
        if (!mWorkerRef->Private()->IsOnCurrentThread()) {
          auto task = MakeRefPtr<DestroyRunnable>(mWorkerRef->Private(), this);
          mMutex.Unlock();
          task->Dispatch();
          return;
        }
      } else if (!NS_IsMainThread()) {
        mMutex.Unlock();
        NS_DispatchToMainThread(NS_NewRunnableFunction(
            "CanvasDataShmemHolder::Destroy", [this]() { Destroy(); }));
        return;
      }

      mCanvasChild->ReturnDataSurfaceShmem(mShmem.forget());
      mCanvasChild = nullptr;
      mWorkerRef = nullptr;
    }

    mMutex.Unlock();
    delete this;
  }

  void DestroyWorker() {
    MutexAutoLock lock(mMutex);
    mCanvasChild = nullptr;
    mWorkerRef = nullptr;
  }

 private:
  Mutex mMutex;
  RefPtr<ipc::SharedMemoryBasic> mShmem;
  RefPtr<CanvasChild> mCanvasChild MOZ_GUARDED_BY(mMutex);
  RefPtr<dom::ThreadSafeWorkerRef> mWorkerRef MOZ_GUARDED_BY(mMutex);
};

CanvasChild::CanvasChild(dom::ThreadSafeWorkerRef* aWorkerRef)
    : mWorkerRef(aWorkerRef) {}

CanvasChild::~CanvasChild() { MOZ_ASSERT(!mWorkerRef); }

static void NotifyCanvasDeviceReset() {
  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
  if (obs) {
    obs->NotifyObservers(nullptr, "canvas-device-reset", nullptr);
  }
}

ipc::IPCResult CanvasChild::RecvNotifyDeviceChanged() {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  NotifyCanvasDeviceReset();
  mRecorder->RecordEvent(RecordedDeviceChangeAcknowledged());
  return IPC_OK();
}

/* static */ bool CanvasChild::mDeactivated = false;

ipc::IPCResult CanvasChild::RecvDeactivate() {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  RefPtr<CanvasChild> self(this);
  mDeactivated = true;
  if (auto* cm = gfx::CanvasManagerChild::Get()) {
    cm->DeactivateCanvas();
  }
  NotifyCanvasDeviceReset();
  return IPC_OK();
}

ipc::IPCResult CanvasChild::RecvBlockCanvas() {
  mBlocked = true;
  if (auto* cm = gfx::CanvasManagerChild::Get()) {
    cm->BlockCanvas();
  }
  return IPC_OK();
}

void CanvasChild::EnsureRecorder(gfx::IntSize aSize, gfx::SurfaceFormat aFormat,
                                 TextureType aTextureType,
                                 TextureType aWebglTextureType) {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  if (!mRecorder) {
    gfx::BackendType backendType =
        gfxPlatform::GetPlatform()->GetPreferredCanvasBackend();
    auto recorder = MakeRefPtr<CanvasDrawEventRecorder>(mWorkerRef);
    if (!recorder->Init(aTextureType, aWebglTextureType, backendType,
                        MakeUnique<RecorderHelpers>(this))) {
      return;
    }

    mRecorder = recorder.forget();
  }

  MOZ_RELEASE_ASSERT(mRecorder->GetTextureType() == aTextureType,
                     "We only support one remote TextureType currently.");

  EnsureDataSurfaceShmem(aSize, aFormat);
}

void CanvasChild::ActorDestroy(ActorDestroyReason aWhy) {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  if (mRecorder) {
    mRecorder->DetachResources();
  }
}

void CanvasChild::Destroy() {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  if (CanSend()) {
    Send__delete__(this);
  }

  mWorkerRef = nullptr;
}

bool CanvasChild::EnsureBeginTransaction() {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  if (!mIsInTransaction) {
    RecordEvent(RecordedCanvasBeginTransaction());
    mIsInTransaction = true;
  }

  return true;
}

void CanvasChild::EndTransaction() {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  if (mIsInTransaction) {
    RecordEvent(RecordedCanvasEndTransaction());
    mIsInTransaction = false;
    mDormant = false;
  } else if (mRecorder) {
    // Schedule to drop free buffers if we have no non-empty transactions.
    if (!mDormant) {
      mDormant = true;
      NS_DelayedDispatchToCurrentThread(
          NewRunnableMethod("CanvasChild::DropFreeBuffersWhenDormant", this,
                            &CanvasChild::DropFreeBuffersWhenDormant),
          StaticPrefs::gfx_canvas_remote_drop_buffer_milliseconds());
    }
  }

  ++mTransactionsSinceGetDataSurface;
}

void CanvasChild::DropFreeBuffersWhenDormant() {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);
  // Drop any free buffers if we have not had any non-empty transactions.
  if (mDormant && mRecorder) {
    mRecorder->DropFreeBuffers();
  }
}

void CanvasChild::ClearCachedResources() {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);
  if (mRecorder) {
    mRecorder->DropFreeBuffers();
    // Notify CanvasTranslator it is about to be minimized.
    SendClearCachedResources();
  }
}

bool CanvasChild::ShouldBeCleanedUp() const {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  // Always return true if we've been deactivated.
  if (Deactivated()) {
    return true;
  }

  // We can only be cleaned up if nothing else references our recorder.
  return !mRecorder || mRecorder->hasOneRef();
}

already_AddRefed<gfx::DrawTargetRecording> CanvasChild::CreateDrawTarget(
    int64_t aTextureId, const RemoteTextureOwnerId& aTextureOwnerId,
    gfx::IntSize aSize, gfx::SurfaceFormat aFormat) {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  if (!mRecorder) {
    return nullptr;
  }

  RefPtr<gfx::DrawTarget> dummyDt = gfx::Factory::CreateDrawTarget(
      gfx::BackendType::SKIA, gfx::IntSize(1, 1), aFormat);
  RefPtr<gfx::DrawTargetRecording> dt = MakeAndAddRef<gfx::DrawTargetRecording>(
      mRecorder, aTextureId, aTextureOwnerId, dummyDt, aSize);
  dt->SetOptimizeTransform(true);

  mTextureInfo.insert({aTextureId, {}});

  return dt.forget();
}

bool CanvasChild::EnsureDataSurfaceShmem(gfx::IntSize aSize,
                                         gfx::SurfaceFormat aFormat) {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  if (!mRecorder) {
    return false;
  }

  size_t sizeRequired =
      ImageDataSerializer::ComputeRGBBufferSize(aSize, aFormat);
  if (!sizeRequired) {
    return false;
  }
  sizeRequired = ipc::SharedMemory::PageAlignedSize(sizeRequired);

  if (!mDataSurfaceShmemAvailable || mDataSurfaceShmem->Size() < sizeRequired) {
    RecordEvent(RecordedPauseTranslation());
    auto dataSurfaceShmem = MakeRefPtr<ipc::SharedMemoryBasic>();
    if (!dataSurfaceShmem->Create(sizeRequired) ||
        !dataSurfaceShmem->Map(sizeRequired)) {
      return false;
    }

    auto shmemHandle = dataSurfaceShmem->TakeHandle();
    if (!shmemHandle) {
      return false;
    }

    if (!SendSetDataSurfaceBuffer(std::move(shmemHandle), sizeRequired)) {
      return false;
    }

    mDataSurfaceShmem = dataSurfaceShmem.forget();
    mDataSurfaceShmemAvailable = true;
  }

  MOZ_ASSERT(mDataSurfaceShmemAvailable);
  return true;
}

void CanvasChild::RecordEvent(const gfx::RecordedEvent& aEvent) {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  // We drop mRecorder in ActorDestroy to break the reference cycle.
  if (!mRecorder) {
    return;
  }

  mRecorder->RecordEvent(aEvent);
}

int64_t CanvasChild::CreateCheckpoint() {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);
  return mRecorder->CreateCheckpoint();
}

already_AddRefed<gfx::DataSourceSurface> CanvasChild::GetDataSurface(
    int64_t aTextureId, const gfx::SourceSurface* aSurface, bool aDetached,
    bool& aMayInvalidate) {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);
  MOZ_ASSERT(aSurface);

  // mTransactionsSinceGetDataSurface is used to determine if we want to prepare
  // a DataSourceSurface in the GPU process up front at the end of the
  // transaction, but that only makes sense if the canvas JS is requesting data
  // in between transactions.
  if (!mIsInTransaction) {
    mTransactionsSinceGetDataSurface = 0;
  }

  if (!EnsureBeginTransaction()) {
    return nullptr;
  }

  gfx::IntSize ssSize = aSurface->GetSize();
  gfx::SurfaceFormat ssFormat = aSurface->GetFormat();
  auto stride = ImageDataSerializer::ComputeRGBStride(ssFormat, ssSize.width);

  // Shmem is only valid if the surface is the latest snapshot (not detached).
  if (!aDetached) {
    // If there is a shmem associated with this snapshot id, then we want to try
    // use that directly without having to allocate a new shmem for retrieval.
    auto it = mTextureInfo.find(aTextureId);
    if (it != mTextureInfo.end() && it->second.mSnapshotShmem) {
      const auto shmemPtr =
          reinterpret_cast<uint8_t*>(it->second.mSnapshotShmem->memory());
      MOZ_ASSERT(shmemPtr);
      mRecorder->RecordEvent(RecordedPrepareShmem(aTextureId));
      auto checkpoint = CreateCheckpoint();
      if (NS_WARN_IF(!mRecorder->WaitForCheckpoint(checkpoint))) {
        return nullptr;
      }
      auto* closure =
          new CanvasDataShmemHolder(it->second.mSnapshotShmem, this);
      if (NS_WARN_IF(!closure->Init(mWorkerRef))) {
        delete closure;
        return nullptr;
      }
      RefPtr<gfx::DataSourceSurface> dataSurface =
          gfx::Factory::CreateWrappingDataSourceSurface(
              shmemPtr, stride, ssSize, ssFormat, ReleaseDataShmemHolder,
              closure);
      aMayInvalidate = true;
      return dataSurface.forget();
    }
  }

  RecordEvent(RecordedPrepareDataForSurface(aSurface));

  if (!EnsureDataSurfaceShmem(ssSize, ssFormat)) {
    return nullptr;
  }

  RecordEvent(RecordedGetDataForSurface(aSurface));
  auto checkpoint = CreateCheckpoint();
  if (NS_WARN_IF(!mRecorder->WaitForCheckpoint(checkpoint))) {
    return nullptr;
  }

  auto* closure = new CanvasDataShmemHolder(mDataSurfaceShmem, this);
  if (NS_WARN_IF(!closure->Init(mWorkerRef))) {
    delete closure;
    return nullptr;
  }

  mDataSurfaceShmemAvailable = false;

  auto* data = static_cast<uint8_t*>(mDataSurfaceShmem->memory());

  RefPtr<gfx::DataSourceSurface> dataSurface =
      gfx::Factory::CreateWrappingDataSourceSurface(
          data, stride, ssSize, ssFormat, ReleaseDataShmemHolder, closure);
  aMayInvalidate = false;
  return dataSurface.forget();
}

/* static */ void CanvasChild::ReleaseDataShmemHolder(void* aClosure) {
  auto* shmemHolder = static_cast<CanvasDataShmemHolder*>(aClosure);
  shmemHolder->Destroy();
}

already_AddRefed<gfx::SourceSurface> CanvasChild::WrapSurface(
    const RefPtr<gfx::SourceSurface>& aSurface, int64_t aTextureId) {
  NS_ASSERT_OWNINGTHREAD(CanvasChild);

  if (!aSurface) {
    return nullptr;
  }

  return MakeAndAddRef<SourceSurfaceCanvasRecording>(aTextureId, aSurface, this,
                                                     mRecorder);
}

void CanvasChild::ReturnDataSurfaceShmem(
    already_AddRefed<ipc::SharedMemoryBasic> aDataSurfaceShmem) {
  RefPtr<ipc::SharedMemoryBasic> data = aDataSurfaceShmem;
  // We can only reuse the latest data surface shmem.
  if (data == mDataSurfaceShmem) {
    MOZ_ASSERT(!mDataSurfaceShmemAvailable);
    mDataSurfaceShmemAvailable = true;
  }
}

void CanvasChild::AttachSurface(const RefPtr<gfx::SourceSurface>& aSurface) {
  if (auto* surface =
          static_cast<SourceSurfaceCanvasRecording*>(aSurface.get())) {
    surface->AttachSurface();
  }
}

void CanvasChild::DetachSurface(const RefPtr<gfx::SourceSurface>& aSurface,
                                bool aInvalidate) {
  if (auto* surface =
          static_cast<SourceSurfaceCanvasRecording*>(aSurface.get())) {
    surface->DetachSurface();
    if (aInvalidate) {
      surface->InvalidateDataSurface();
    }
  }
}

ipc::IPCResult CanvasChild::RecvNotifyRequiresRefresh(int64_t aTextureId) {
  auto it = mTextureInfo.find(aTextureId);
  if (it != mTextureInfo.end()) {
    it->second.mRequiresRefresh = true;
  }
  return IPC_OK();
}

bool CanvasChild::RequiresRefresh(int64_t aTextureId) const {
  if (mBlocked) {
    return true;
  }
  auto it = mTextureInfo.find(aTextureId);
  if (it != mTextureInfo.end()) {
    return it->second.mRequiresRefresh;
  }
  return false;
}

ipc::IPCResult CanvasChild::RecvSnapshotShmem(
    int64_t aTextureId, Handle&& aShmemHandle, uint32_t aShmemSize,
    SnapshotShmemResolver&& aResolve) {
  auto it = mTextureInfo.find(aTextureId);
  if (it != mTextureInfo.end()) {
    auto shmem = MakeRefPtr<ipc::SharedMemoryBasic>();
    if (NS_WARN_IF(!shmem->SetHandle(std::move(aShmemHandle),
                                     ipc::SharedMemory::RightsReadOnly)) ||
        NS_WARN_IF(!shmem->Map(aShmemSize))) {
      shmem = nullptr;
    } else {
      it->second.mSnapshotShmem = std::move(shmem);
    }
    aResolve(true);
  } else {
    aResolve(false);
  }
  return IPC_OK();
}

void CanvasChild::CleanupTexture(int64_t aTextureId) {
  mTextureInfo.erase(aTextureId);
}

}  // namespace layers
}  // namespace mozilla