blendchanges.h

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/*
    KWin - the KDE window manager
    This file is part of the KDE project.
 
    SPDX-FileCopyrightText: 2022 David Edmundson <davidedmundson@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
#pragma once
#include "effect/offscreeneffect.h"
#include "effect/timeline.h"
#include <chrono>
 
namespace KWin
{
 
class BlendChanges : public CrossFadeEffect
{
    Q_OBJECT
 
public:
    BlendChanges();
    ~BlendChanges() override;
 
    static bool supported();
 
    // Effect interface
    void prePaintScreen(ScreenPrePaintData &data, std::chrono::milliseconds presentTime) override;
    void postPaintScreen() override;
    void paintWindow(const RenderTarget &renderTarget, const RenderViewport &viewport, EffectWindow *w, int mask, QRegion region, WindowPaintData &data) override;
 
    bool isActive() const override;
 
    int requestedEffectChainPosition() const override
    {
        return 80;
    }
 
public Q_SLOTS:
    void start(int delay = 300);
 
private:
    TimeLine m_timeline;
    enum State {
        Off,
        ShowingCache,
        Blending
    };
    State m_state = Off;
};
 
} // namespace KWin