d2ccec310e
- Move member function implementations to the .cpp file. - Rename Disable -> DisableFlattening - Update comments for functions Change-Id: I71eec96597a0d41f652b897c1862a34138b5be85
108 lines
3.1 KiB
C++
108 lines
3.1 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 "utils/log.h"
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namespace android::drm_hwcomposer {
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FlatteningController::FlatteningController(FlatConCallbacks callbacks,
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std::chrono::milliseconds timeout)
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: cbks_(std::move(callbacks)), 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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state_ = 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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state_ = 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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state_ = 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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cbks_ = {};
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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 (!cbks_.trigger)
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break;
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if (sleep_until_ <= std::chrono::system_clock::now() &&
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(state_ == State::kActive)) {
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state_ = 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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} // namespace android::drm_hwcomposer
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