magnifier.h

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/*
    KWin - the KDE window manager
    This file is part of the KDE project.
 
    SPDX-FileCopyrightText: 2007 Lubos Lunak <l.lunak@kde.org>
    SPDX-FileCopyrightText: 2011 Martin Gräßlin <mgraesslin@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#pragma once
 
#include "effect/effect.h"
 
namespace KWin
{
 
class GLFramebuffer;
class GLTexture;
 
class MagnifierEffect : public Effect
{
    Q_OBJECT
    Q_PROPERTY(QSize magnifierSize READ magnifierSize)
    Q_PROPERTY(qreal targetZoom READ targetZoom)
public:
    MagnifierEffect();
    ~MagnifierEffect() override;
    void reconfigure(ReconfigureFlags) override;
    void prePaintScreen(ScreenPrePaintData &data, std::chrono::milliseconds presentTime) override;
    void paintScreen(const RenderTarget &renderTarget, const RenderViewport &viewport, int mask, const QRegion &region, Output *screen) override;
    void postPaintScreen() override;
    bool isActive() const override;
    static bool supported();
 
    // for properties
    QSize magnifierSize() const;
    qreal targetZoom() const;
private Q_SLOTS:
    void zoomIn();
    void zoomOut();
    void toggle();
    void slotMouseChanged(const QPointF &pos, const QPointF &old,
                          Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
                          Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers);
    void slotWindowAdded(EffectWindow *w);
    void slotWindowDamaged();
 
private:
    QRect magnifierArea(QPointF pos = cursorPos()) const;
    double m_zoom;
    double m_targetZoom;
    bool m_polling; // Mouse polling
    std::chrono::milliseconds m_lastPresentTime;
    QSize m_magnifierSize;
    std::unique_ptr<GLTexture> m_texture;
    std::unique_ptr<GLFramebuffer> m_fbo;
};
 
} // namespace