Add SF side tunnel mode listener
This CL adds a TunnelModeStateReporter, which monitors if there are
any layers with a sideband stream in SurfaceFlinger. If any of the
layers have a sideband stream, it informs all the registered listeners
that tunnel mode is enabled. When no layers have a sideband stream, it
notifies the listeners that tunnel mode is disabled.
Bug: 171457637
Test: atest TunnelModeStateListenerTest
Test: atest TunnelModeStateReporterTest
Change-Id: Ie54b34dbd9b6253d7142e9b0f690c8469374604d
diff --git a/services/surfaceflinger/TunnelModeEnabledReporter.cpp b/services/surfaceflinger/TunnelModeEnabledReporter.cpp
new file mode 100644
index 0000000..1b3ddf7
--- /dev/null
+++ b/services/surfaceflinger/TunnelModeEnabledReporter.cpp
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#undef LOG_TAG
+#define LOG_TAG "TunnelModeEnabledReporter"
+#define ATRACE_TAG ATRACE_TAG_GRAPHICS
+
+#include <algorithm>
+
+#include "Layer.h"
+#include "SurfaceFlinger.h"
+#include "TunnelModeEnabledReporter.h"
+
+namespace android {
+
+TunnelModeEnabledReporter::TunnelModeEnabledReporter(SurfaceFlinger& flinger) : mFlinger(flinger) {}
+
+void TunnelModeEnabledReporter::updateTunnelModeStatus() {
+ bool tunnelModeEnabled = false;
+ mFlinger.mCurrentState.traverse([&](Layer* layer) {
+ auto& currentState = layer->getCurrentState();
+ if (currentState.sidebandStream != nullptr) {
+ tunnelModeEnabled = true;
+ return;
+ }
+ });
+ dispatchTunnelModeEnabled(tunnelModeEnabled);
+}
+
+void TunnelModeEnabledReporter::dispatchTunnelModeEnabled(bool tunnelModeEnabled) {
+ std::vector<sp<gui::ITunnelModeEnabledListener>> localListeners;
+ {
+ std::scoped_lock lock(mMutex);
+ if (mTunnelModeEnabled == tunnelModeEnabled) {
+ return;
+ }
+ mTunnelModeEnabled = tunnelModeEnabled;
+
+ std::transform(mListeners.begin(), mListeners.end(), std::back_inserter(localListeners),
+ [](const std::pair<wp<IBinder>, sp<gui::ITunnelModeEnabledListener>>&
+ entry) { return entry.second; });
+ }
+
+ for (sp<gui::ITunnelModeEnabledListener>& listener : localListeners) {
+ listener->onTunnelModeEnabledChanged(tunnelModeEnabled);
+ }
+}
+
+void TunnelModeEnabledReporter::binderDied(const wp<IBinder>& who) {
+ std::scoped_lock lock(mMutex);
+ mListeners.erase(who);
+}
+
+void TunnelModeEnabledReporter::addListener(const sp<gui::ITunnelModeEnabledListener>& listener) {
+ sp<IBinder> asBinder = IInterface::asBinder(listener);
+ asBinder->linkToDeath(this);
+ bool tunnelModeEnabled = false;
+ {
+ std::scoped_lock lock(mMutex);
+ mListeners.emplace(wp<IBinder>(asBinder), listener);
+ tunnelModeEnabled = mTunnelModeEnabled;
+ }
+ listener->onTunnelModeEnabledChanged(tunnelModeEnabled);
+}
+
+void TunnelModeEnabledReporter::removeListener(
+ const sp<gui::ITunnelModeEnabledListener>& listener) {
+ std::lock_guard lock(mMutex);
+ mListeners.erase(wp<IBinder>(IInterface::asBinder(listener)));
+}
+
+} // namespace android