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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=4 ts=8 et 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_layers_LayerTreeOwnerTracker_h
#define mozilla_layers_LayerTreeOwnerTracker_h
#include "base/process.h" // for base::ProcessId
#include "mozilla/Mutex.h" // for mozilla::Mutex
#include "mozilla/Function.h"
#include <map>
namespace mozilla {
namespace dom {
class ContentParent;
}
namespace layers {
/**
* A utility class for tracking which content processes should be allowed
* to access which layer trees.
*
* ProcessId's are used to track which content process can access the layer
* tree, and in the case of nested browser's we use the top level content
* processes' ProcessId.
*
* This class is only available in the main process and gpu process. Mappings
* are synced from main process to the gpu process. The actual syncing happens
* in GPUProcessManager, and so this class should not be used directly.
*/
class LayerTreeOwnerTracker final
{
public:
static void Initialize();
static void Shutdown();
static LayerTreeOwnerTracker* Get();
/**
* Map aLayersId and aProcessId together so that that process
* can access that layer tree.
*/
void Map(uint64_t aLayersId, base::ProcessId aProcessId);
/**
* Remove an existing mapping.
*/
void Unmap(uint64_t aLayersId, base::ProcessId aProcessId);
/**
* Checks whether it is okay for aProcessId to access aLayersId.
*/
bool IsMapped(uint64_t aLayersId, base::ProcessId aProcessId);
void Iterate(function<void(uint64_t aLayersId, base::ProcessId aProcessId)> aCallback);
private:
LayerTreeOwnerTracker();
mozilla::Mutex mLayerIdsLock;
std::map<uint64_t, base::ProcessId> mLayerIds;
};
} // namespace layers
} // namespace mozilla
#endif // mozilla_layers_LayerTreeOwnerTracker_h
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