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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_XR_XR_FRAME_REQUEST_CALLBACK_COLLECTION_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_XR_XR_FRAME_REQUEST_CALLBACK_COLLECTION_H_
#include <memory>
#include "base/check_op.h"
#include "base/rand_util.h"
#include "third_party/blink/renderer/platform/bindings/name_client.h"
#include "third_party/blink/renderer/platform/heap/collection_support/heap_hash_map.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class ExecutionContext;
class V8XRFrameRequestCallback;
class XRFrame;
class XRSession;
namespace probe {
class AsyncTaskContext;
}
class XRFrameRequestCallbackCollection final
: public GarbageCollected<XRFrameRequestCallbackCollection>,
public NameClient {
public:
explicit XRFrameRequestCallbackCollection(ExecutionContext*);
~XRFrameRequestCallbackCollection() override = default;
using CallbackId = int;
CallbackId RegisterCallback(V8XRFrameRequestCallback*);
void CancelCallback(CallbackId);
void ExecuteCallbacks(XRSession*, double timestamp, XRFrame*);
bool IsEmpty() const {
DCHECK_EQ(callback_frame_requests_.size(), callback_async_tasks_.size());
return !callback_frame_requests_.size();
}
void Trace(Visitor*) const;
const char* NameInHeapSnapshot() const override {
return "XRFrameRequestCallbackCollection";
}
private:
bool IsValidCallbackId(int id) {
using Traits = HashTraits<CallbackId>;
return !WTF::IsHashTraitsEmptyOrDeletedValue<Traits, CallbackId>(id);
}
using CallbackFrameRequestMap =
HeapHashMap<CallbackId, Member<V8XRFrameRequestCallback>>;
using CallbackAsyncTaskMap =
HashMap<CallbackId, std::unique_ptr<probe::AsyncTaskContext>>;
CallbackFrameRequestMap callback_frame_requests_;
CallbackAsyncTaskMap callback_async_tasks_;
Vector<CallbackId> pending_callbacks_;
// Only non-empty while inside executeCallbacks.
CallbackFrameRequestMap current_callback_frame_requests_;
CallbackAsyncTaskMap current_callback_async_tasks_;
CallbackId next_callback_id_ = 0;
// Trace IDs need to be unique for any outstanding frames. While we can only
// have one immersive session at a time, that is not the case for inline
// sessions. Since this class is created per-session, we cannot simply
// use `next_callback_id_`. Instead we generate a random number over
// a sufficiently large space to provide an offset so that outstanding frames
// should for all pracitcal purposes never overlap.
const uint64_t trace_id_base_ = base::RandUint64();
Member<ExecutionContext> context_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_XR_XR_FRAME_REQUEST_CALLBACK_COLLECTION_H_
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