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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 "OffscreenCanvasRenderingContext2D.h"
#include "mozilla/CycleCollectedJSRuntime.h"
#include "mozilla/dom/OffscreenCanvasRenderingContext2DBinding.h"
#include "mozilla/dom/OffscreenCanvas.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/dom/WorkerRef.h"
using namespace mozilla;
namespace mozilla::dom {
class OffscreenCanvasShutdownObserver final {
NS_INLINE_DECL_REFCOUNTING(OffscreenCanvasShutdownObserver)
public:
explicit OffscreenCanvasShutdownObserver(
OffscreenCanvasRenderingContext2D* aOwner)
: mOwner(aOwner) {}
void OnShutdown() {
if (mOwner) {
mOwner->OnShutdown();
mOwner = nullptr;
}
}
void ClearOwner() { mOwner = nullptr; }
private:
~OffscreenCanvasShutdownObserver() = default;
OffscreenCanvasRenderingContext2D* mOwner;
};
NS_IMPL_CYCLE_COLLECTION_INHERITED(OffscreenCanvasRenderingContext2D,
CanvasRenderingContext2D)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(OffscreenCanvasRenderingContext2D)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_END_INHERITING(CanvasRenderingContext2D)
// Need to use NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_INHERITED
// and dummy trace since we're missing some _SKIPPABLE_ macros without
// SCRIPT_HOLDER.
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(
OffscreenCanvasRenderingContext2D, CanvasRenderingContext2D)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(OffscreenCanvasRenderingContext2D)
return tmp->HasKnownLiveWrapper();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(OffscreenCanvasRenderingContext2D)
return tmp->HasKnownLiveWrapper();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(OffscreenCanvasRenderingContext2D)
return tmp->HasKnownLiveWrapper();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
NS_IMPL_ADDREF_INHERITED(OffscreenCanvasRenderingContext2D,
CanvasRenderingContext2D)
NS_IMPL_RELEASE_INHERITED(OffscreenCanvasRenderingContext2D,
CanvasRenderingContext2D)
OffscreenCanvasRenderingContext2D::OffscreenCanvasRenderingContext2D(
layers::LayersBackend aCompositorBackend)
: CanvasRenderingContext2D(aCompositorBackend) {}
OffscreenCanvasRenderingContext2D::~OffscreenCanvasRenderingContext2D() =
default;
JSObject* OffscreenCanvasRenderingContext2D::WrapObject(
JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
return OffscreenCanvasRenderingContext2D_Binding::Wrap(aCx, this,
aGivenProto);
}
nsIGlobalObject* OffscreenCanvasRenderingContext2D::GetParentObject() const {
return mOffscreenCanvas->GetOwnerGlobal();
}
NS_IMETHODIMP OffscreenCanvasRenderingContext2D::InitializeWithDrawTarget(
nsIDocShell* aShell, NotNull<gfx::DrawTarget*> aTarget) {
return NS_ERROR_NOT_IMPLEMENTED;
}
void OffscreenCanvasRenderingContext2D::AddShutdownObserver() {
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
if (!workerPrivate) {
// We may be using OffscreenCanvas on the main thread.
CanvasRenderingContext2D::AddShutdownObserver();
return;
}
mOffscreenShutdownObserver =
MakeAndAddRef<OffscreenCanvasShutdownObserver>(this);
mWorkerRef = WeakWorkerRef::Create(
workerPrivate,
[observer = mOffscreenShutdownObserver] { observer->OnShutdown(); });
}
void OffscreenCanvasRenderingContext2D::RemoveShutdownObserver() {
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
if (!workerPrivate) {
// We may be using OffscreenCanvas on the main thread.
CanvasRenderingContext2D::RemoveShutdownObserver();
return;
}
if (mOffscreenShutdownObserver) {
mOffscreenShutdownObserver->ClearOwner();
}
mOffscreenShutdownObserver = nullptr;
mWorkerRef = nullptr;
}
void OffscreenCanvasRenderingContext2D::OnShutdown() {
if (mOffscreenShutdownObserver) {
mOffscreenShutdownObserver->ClearOwner();
mOffscreenShutdownObserver = nullptr;
}
CanvasRenderingContext2D::OnShutdown();
}
void OffscreenCanvasRenderingContext2D::Commit(ErrorResult& aRv) {
if (!mOffscreenCanvas->IsTransferredFromElement()) {
return;
}
mOffscreenCanvas->CommitFrameToCompositor();
}
void OffscreenCanvasRenderingContext2D::AddZoneWaitingForGC() {
JSObject* wrapper = GetWrapperPreserveColor();
if (wrapper) {
CycleCollectedJSRuntime::Get()->AddZoneWaitingForGC(
JS::GetObjectZone(wrapper));
}
}
void OffscreenCanvasRenderingContext2D::AddAssociatedMemory() {
JSObject* wrapper = GetWrapperMaybeDead();
if (wrapper) {
JS::AddAssociatedMemory(wrapper, BindingJSObjectMallocBytes(this),
JS::MemoryUse::DOMBinding);
}
}
void OffscreenCanvasRenderingContext2D::RemoveAssociatedMemory() {
JSObject* wrapper = GetWrapperMaybeDead();
if (wrapper) {
JS::RemoveAssociatedMemory(wrapper, BindingJSObjectMallocBytes(this),
JS::MemoryUse::DOMBinding);
}
}
size_t BindingJSObjectMallocBytes(OffscreenCanvasRenderingContext2D* aContext) {
gfx::IntSize size = aContext->GetSize();
// TODO: Bug 1552137: No memory will be allocated if either dimension is
// greater than gfxPrefs::gfx_canvas_max_size(). We should check this here
// too.
CheckedInt<uint32_t> bytes =
CheckedInt<uint32_t>(size.width) * size.height * 4;
if (!bytes.isValid()) {
return 0;
}
return bytes.value();
}
} // namespace mozilla::dom
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