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/* -*- 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/. */
#ifndef mozilla_dom_AnimationFrameProvider_h
#define mozilla_dom_AnimationFrameProvider_h
#include "mozilla/dom/AnimationFrameProviderBinding.h"
#include "mozilla/HashTable.h"
#include "mozilla/RefPtr.h"
#include "nsTArray.h"
namespace mozilla::dom {
struct FrameRequest {
FrameRequest(FrameRequestCallback& aCallback, int32_t aHandle);
~FrameRequest();
// Comparator operators to allow RemoveElementSorted with an
// integer argument on arrays of FrameRequest
bool operator==(int32_t aHandle) const { return mHandle == aHandle; }
bool operator<(int32_t aHandle) const { return mHandle < aHandle; }
RefPtr<FrameRequestCallback> mCallback;
int32_t mHandle;
};
class FrameRequestManager {
public:
FrameRequestManager() = default;
~FrameRequestManager() = default;
nsresult Schedule(FrameRequestCallback& aCallback, int32_t* aHandle);
bool Cancel(int32_t aHandle);
bool IsEmpty() const { return mCallbacks.IsEmpty(); }
bool IsCanceled(int32_t aHandle) const {
return !mCanceledCallbacks.empty() && mCanceledCallbacks.has(aHandle);
}
void Take(nsTArray<FrameRequest>& aCallbacks) {
aCallbacks = std::move(mCallbacks);
mCanceledCallbacks.clear();
}
void Unlink();
void Traverse(nsCycleCollectionTraversalCallback& aCB);
private:
nsTArray<FrameRequest> mCallbacks;
// The set of frame request callbacks that were canceled but which we failed
// to find in mFrameRequestCallbacks.
HashSet<int32_t> mCanceledCallbacks;
/**
* The current frame request callback handle
*/
int32_t mCallbackCounter = 0;
};
inline void ImplCycleCollectionUnlink(FrameRequestManager& aField) {
aField.Unlink();
}
inline void ImplCycleCollectionTraverse(
nsCycleCollectionTraversalCallback& aCallback, FrameRequestManager& aField,
const char* aName, uint32_t aFlags) {
aField.Traverse(aCallback);
}
} // namespace mozilla::dom
#endif
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