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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /gfx/layers/ipc/LayerTreeOwnerTracker.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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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