141 lines
4 KiB
C++
141 lines
4 KiB
C++
/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Usually, display controllers do not use intermediate buffer for composition
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* results. Instead, they scan-out directly from the input buffers, composing
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* the planes on the fly every VSYNC.
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*
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* Flattening is a technique that reduces memory bandwidth and power consumption
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* by converting non-updating multi-plane composition into a single-plane.
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* Additionally, flattening also makes more shared planes available for use by
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* other CRTCs.
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*
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* If the client is not updating layers for 1 second, FlatCon triggers a
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* callback to refresh the screen. The compositor should mark all layers to be
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* composed by the client into a single framebuffer using GPU.
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*/
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#define LOG_TAG "drmhwc"
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#include "FlatteningController.h"
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#include <chrono>
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#include <mutex>
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#include <thread>
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#include <android-base/thread_annotations.h>
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#include "compositor/FlatteningEventAtomReporter.h"
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#include "hwc/HwcDisplay.h"
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#include "utils/log.h"
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namespace android::drm_hwcomposer {
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FlatteningController::FlatteningController(DisplayHandle handle,
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FlatConCallbacks callbacks,
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std::chrono::milliseconds timeout)
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: handle_(handle),
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reporter_(FlatteningEventAtomReporter::Create()),
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cbks_(std::move(callbacks)),
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timeout_(timeout) {
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thread_ = std::thread(&FlatteningController::ThreadFn, this);
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}
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FlatteningController::~FlatteningController() {
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StopThread();
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thread_.join();
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}
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void FlatteningController::DisableFlattening() {
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auto lock = std::lock_guard<std::mutex>(mutex_);
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SetState(State::kDisabled);
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}
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void FlatteningController::NewFrame() {
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auto lock = std::lock_guard<std::mutex>(mutex_);
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if (state_ == State::kTriggeredCallback) {
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SetState(State::kFlattened);
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return;
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}
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sleep_until_ = std::chrono::system_clock::now() + timeout_;
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bool was_active = (state_ == State::kActive);
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SetState(State::kActive);
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if (!was_active) {
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cv_.notify_all();
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}
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}
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bool FlatteningController::ShouldFlatten() const {
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auto lock = std::lock_guard<std::mutex>(mutex_);
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return state_ == State::kTriggeredCallback || state_ == State::kFlattened;
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}
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void FlatteningController::StopThread() {
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auto lock = std::lock_guard<std::mutex>(mutex_);
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SetState(State::kExitThread);
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cv_.notify_all();
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}
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void FlatteningController::ThreadFn() {
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for (;;) {
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std::unique_lock<std::mutex> lock(mutex_);
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base::ScopedLockAssertion lock_assertion(mutex_);
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if (state_ == State::kExitThread) {
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break;
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}
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if (sleep_until_ <= std::chrono::system_clock::now() &&
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(state_ == State::kActive)) {
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SetState(State::kTriggeredCallback);
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ALOGV("Timeout. Sending an event to compositor");
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cbks_.trigger();
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}
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if (state_ != State::kActive) {
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ALOGV("Wait");
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cv_.wait(lock);
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} else {
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ALOGV("Wait_until");
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cv_.wait_until(lock, sleep_until_);
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}
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}
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}
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void FlatteningController::SetState(State state) {
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if (state_ != state) {
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state_ = state;
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if (reporter_) {
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switch (state_) {
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case State::kDisabled:
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case State::kActive:
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case State::kFlattened:
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reporter_->PushAtom(handle_, state_);
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break;
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case State::kTriggeredCallback:
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case State::kExitThread:
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// Internal states, no need to report.
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break;
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}
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}
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}
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}
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} // namespace android::drm_hwcomposer
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