transaction.h

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/*
    SPDX-FileCopyrightText: 2023 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
*/
 
#pragma once
 
#include "core/graphicsbuffer.h"
 
#include <QPointer>
 
#include <functional>
#include <memory>
#include <vector>
 
namespace KWin
{
 
class SurfaceInterface;
struct SurfaceState;
class Transaction;
 
struct TransactionEntry
{
    QPointer<SurfaceInterface> surface;
 
    Transaction *previousTransaction = nullptr;
 
    Transaction *nextTransaction = nullptr;
 
    GraphicsBufferRef buffer;
 
    std::unique_ptr<SurfaceState> state;
};
 
class KWIN_EXPORT Transaction
{
public:
    Transaction();
 
    void lock();
 
    void unlock();
 
    bool isReady() const;
 
    Transaction *next(SurfaceInterface *surface) const;
 
    void add(SurfaceInterface *surface);
 
    void amend(SurfaceInterface *surface, std::function<void(SurfaceState *state)> mutator);
 
    void merge(Transaction *other);
 
    void commit();
 
private:
    void apply();
    bool tryApply();
 
    std::vector<TransactionEntry> m_entries;
    int m_locks = 0;
};
 
} // namespace KWin