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/*
* Copyright (C) 2015 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.
*/
#ifndef ANDROID_DRM_ATOMIC_STATE_MANAGER_H_
#define ANDROID_DRM_ATOMIC_STATE_MANAGER_H_
#include <pthread.h>
#include <functional>
#include <memory>
#include <optional>
#include <sstream>
#include <tuple>
#include "compositor/DrmKmsPlan.h"
#include "compositor/LayerData.h"
#include "drm/DrmPlane.h"
#include "drm/ResourceManager.h"
#include "drm/VSyncWorker.h"
namespace android {
struct AtomicCommitArgs {
/* inputs. All fields are optional, but at least one has to be specified */
bool test_only = false;
std::optional<DrmMode> display_mode;
std::optional<bool> active;
std::shared_ptr<DrmKmsPlan> composition;
/* out */
UniqueFd out_fence;
/* helpers */
auto HasInputs() -> bool {
return display_mode || active || composition;
}
};
class PresentTrackerThread {
public:
explicit PresentTrackerThread(DrmAtomicStateManager *st_man);
~PresentTrackerThread();
void Stop() {
/* Exit thread by signalling that object is no longer valid */
st_man_ = nullptr;
Notify();
pt_.detach();
}
void Notify() {
cv_.notify_all();
}
private:
DrmAtomicStateManager *st_man_{};
void PresentTrackerThreadFn();
std::condition_variable cv_;
std::thread pt_;
std::mutex *mutex_;
};
class DrmAtomicStateManager {
friend class PresentTrackerThread;
public:
explicit DrmAtomicStateManager(DrmDisplayPipeline *pipe)
: pipe_(pipe),
ptt_(std::make_unique<PresentTrackerThread>(this).release()){};
DrmAtomicStateManager(const DrmAtomicStateManager &) = delete;
~DrmAtomicStateManager() {
ptt_->Stop();
}
auto ExecuteAtomicCommit(AtomicCommitArgs &args) -> int;
auto ActivateDisplayUsingDPMS() -> int;
private:
auto CommitFrame(AtomicCommitArgs &args) -> int;
struct KmsState {
/* Required to cleanup unused planes */
std::vector<std::shared_ptr<BindingOwner<DrmPlane>>> used_planes;
/* We have to hold a reference to framebuffer while displaying it ,
* otherwise picture will blink */
std::vector<std::shared_ptr<DrmFbIdHandle>> used_framebuffers;
DrmModeUserPropertyBlobUnique mode_blob;
int release_fence_pt_index{};
/* To avoid setting the inactive state twice, which will fail the commit */
bool crtc_active_state{};
} active_frame_state_;
auto NewFrameState() -> KmsState {
auto *prev_frame_state = &active_frame_state_;
return (KmsState){
.used_planes = prev_frame_state->used_planes,
.crtc_active_state = prev_frame_state->crtc_active_state,
};
}
DrmDisplayPipeline *const pipe_;
void CleanupPriorFrameResources();
/* Present (swap) tracking */
PresentTrackerThread *ptt_;
KmsState staged_frame_state_;
UniqueFd last_present_fence_;
int frames_staged_{};
int frames_tracked_{};
};
} // namespace android
#endif // ANDROID_DRM_DISPLAY_COMPOSITOR_H_
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