damagejournal.h

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/*
    SPDX-FileCopyrightText: 2022 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#pragma once
 
#include "kwin_export.h"
 
#include <QList>
#include <QRegion>
 
namespace KWin
{
 
class KWIN_EXPORT DamageJournal
{
public:
    int capacity() const
    {
        return m_capacity;
    }
 
    void setCapacity(int capacity)
    {
        m_capacity = capacity;
    }
 
    void add(const QRegion &region)
    {
        while (m_log.size() >= m_capacity) {
            m_log.takeLast();
        }
        m_log.prepend(region);
    }
 
    void clear()
    {
        m_log.clear();
    }
 
    QRegion accumulate(int bufferAge, const QRegion &fallback = QRegion()) const
    {
        QRegion region;
        if (bufferAge > 0 && bufferAge <= m_log.size()) {
            for (int i = 0; i < bufferAge - 1; ++i) {
                region += m_log[i];
            }
        } else {
            region = fallback;
        }
        return region;
    }
 
    QRegion lastDamage() const
    {
        return m_log.first();
    }
 
private:
    QList<QRegion> m_log;
    int m_capacity = 10;
};
 
} // namespace KWin