зеркало из https://github.com/mozilla/gecko-dev.git
72 строки
2.0 KiB
C++
72 строки
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set sw=4 ts=8 et tw=80 : */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_layers_LayerTreeOwnerTracker_h
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#define mozilla_layers_LayerTreeOwnerTracker_h
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#include "base/process.h" // for base::ProcessId
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#include "mozilla/Mutex.h" // for mozilla::Mutex
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#include <functional>
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#include <map>
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namespace mozilla {
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namespace dom {
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class ContentParent;
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}
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namespace layers {
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/**
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* A utility class for tracking which content processes should be allowed
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* to access which layer trees.
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*
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* ProcessId's are used to track which content process can access the layer
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* tree, and in the case of nested browser's we use the top level content
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* processes' ProcessId.
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*
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* This class is only available in the main process and gpu process. Mappings
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* are synced from main process to the gpu process. The actual syncing happens
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* in GPUProcessManager, and so this class should not be used directly.
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*/
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class LayerTreeOwnerTracker final
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{
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public:
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static void Initialize();
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static void Shutdown();
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static LayerTreeOwnerTracker* Get();
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/**
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* Map aLayersId and aProcessId together so that that process
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* can access that layer tree.
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*/
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void Map(uint64_t aLayersId, base::ProcessId aProcessId);
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/**
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* Remove an existing mapping.
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*/
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void Unmap(uint64_t aLayersId, base::ProcessId aProcessId);
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/**
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* Checks whether it is okay for aProcessId to access aLayersId.
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*/
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bool IsMapped(uint64_t aLayersId, base::ProcessId aProcessId);
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void Iterate(const std::function<void(uint64_t aLayersId, base::ProcessId aProcessId)>& aCallback);
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private:
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LayerTreeOwnerTracker();
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mozilla::Mutex mLayerIdsLock;
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std::map<uint64_t, base::ProcessId> mLayerIds;
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};
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} // namespace layers
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} // namespace mozilla
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#endif // mozilla_layers_LayerTreeOwnerTracker_h
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