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/*
* 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.
*/
#include <ftl/small_vector.h>
#include <gui/ISurfaceComposer.h>
#include "SurfaceFlinger.h"
#include "WindowInfosListenerInvoker.h"
namespace android {
using gui::DisplayInfo;
using gui::IWindowInfosListener;
using gui::WindowInfo;
struct WindowInfosListenerInvoker::WindowInfosReportedListener
: gui::BnWindowInfosReportedListener {
explicit WindowInfosReportedListener(WindowInfosListenerInvoker& invoker, size_t callbackCount,
bool shouldSync)
: mInvoker(invoker), mCallbacksPending(callbackCount), mShouldSync(shouldSync) {}
binder::Status onWindowInfosReported() override {
mCallbacksPending--;
if (mCallbacksPending == 0) {
mInvoker.windowInfosReported(mShouldSync);
}
return binder::Status::ok();
}
private:
WindowInfosListenerInvoker& mInvoker;
std::atomic<size_t> mCallbacksPending;
bool mShouldSync;
};
WindowInfosListenerInvoker::WindowInfosListenerInvoker(SurfaceFlinger& flinger)
: mFlinger(flinger) {}
void WindowInfosListenerInvoker::addWindowInfosListener(sp<IWindowInfosListener> listener) {
sp<IBinder> asBinder = IInterface::asBinder(listener);
asBinder->linkToDeath(this);
std::scoped_lock lock(mListenersMutex);
mWindowInfosListeners.try_emplace(asBinder, std::move(listener));
}
void WindowInfosListenerInvoker::removeWindowInfosListener(
const sp<IWindowInfosListener>& listener) {
sp<IBinder> asBinder = IInterface::asBinder(listener);
std::scoped_lock lock(mListenersMutex);
asBinder->unlinkToDeath(this);
mWindowInfosListeners.erase(asBinder);
}
void WindowInfosListenerInvoker::binderDied(const wp<IBinder>& who) {
std::scoped_lock lock(mListenersMutex);
mWindowInfosListeners.erase(who);
}
void WindowInfosListenerInvoker::windowInfosChanged(std::vector<WindowInfo> windowInfos,
std::vector<DisplayInfo> displayInfos,
bool shouldSync, bool forceImmediateCall) {
auto callListeners = [this, windowInfos = std::move(windowInfos),
displayInfos = std::move(displayInfos)](bool shouldSync) mutable {
ftl::SmallVector<const sp<IWindowInfosListener>, kStaticCapacity> windowInfosListeners;
{
std::scoped_lock lock(mListenersMutex);
for (const auto& [_, listener] : mWindowInfosListeners) {
windowInfosListeners.push_back(listener);
}
}
auto reportedListener =
sp<WindowInfosReportedListener>::make(*this, windowInfosListeners.size(),
shouldSync);
for (const auto& listener : windowInfosListeners) {
auto status =
listener->onWindowInfosChanged(windowInfos, displayInfos, reportedListener);
if (!status.isOk()) {
reportedListener->onWindowInfosReported();
}
}
};
{
std::scoped_lock lock(mMessagesMutex);
// If there are unacked messages and this isn't a forced call, then return immediately.
// If a forced window infos change doesn't happen first, the update will be sent after
// the WindowInfosReportedListeners are called. If a forced window infos change happens or
// if there are subsequent delayed messages before this update is sent, then this message
// will be dropped and the listeners will only be called with the latest info. This is done
// to reduce the amount of binder memory used.
if (mActiveMessageCount > 0 && !forceImmediateCall) {
mWindowInfosChangedDelayed = std::move(callListeners);
mShouldSyncDelayed |= shouldSync;
return;
}
mWindowInfosChangedDelayed = nullptr;
shouldSync |= mShouldSyncDelayed;
mShouldSyncDelayed = false;
mActiveMessageCount++;
}
callListeners(shouldSync);
}
void WindowInfosListenerInvoker::windowInfosReported(bool shouldSync) {
if (shouldSync) {
mFlinger.windowInfosReported();
}
std::function<void(bool)> callListeners;
bool shouldSyncDelayed;
{
std::scoped_lock lock{mMessagesMutex};
mActiveMessageCount--;
if (!mWindowInfosChangedDelayed || mActiveMessageCount > 0) {
return;
}
mActiveMessageCount++;
callListeners = std::move(mWindowInfosChangedDelayed);
mWindowInfosChangedDelayed = nullptr;
shouldSyncDelayed = mShouldSyncDelayed;
mShouldSyncDelayed = false;
}
callListeners(shouldSyncDelayed);
}
} // namespace android
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