kwin/effects/touchpoints/touchpoints.h

/*
    KWin - the KDE window manager
    This file is part of the KDE project.

    SPDX-FileCopyrightText: 2012 Filip Wieladek <wattos@gmail.com>
    SPDX-FileCopyrightText: 2016 Martin Gräßlin <mgraesslin@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#ifndef KWIN_TOUCHPOINTS_H
#define KWIN_TOUCHPOINTS_H

#include <kwineffects.h>

namespace KWin
{

class TouchPointsEffect
    : public Effect
{
    Q_OBJECT
    Q_PROPERTY(qreal lineWidth READ lineWidth)
    Q_PROPERTY(int ringLife READ ringLife)
    Q_PROPERTY(int ringSize READ ringSize)
    Q_PROPERTY(int ringCount READ ringCount)
public:
    TouchPointsEffect();
    ~TouchPointsEffect() override;
    void prePaintScreen(ScreenPrePaintData& data, std::chrono::milliseconds presentTime) override;
    void paintScreen(int mask, const QRegion &region, ScreenPaintData& data) override;
    void postPaintScreen() override;
    bool isActive() const override;
    bool touchDown(qint32 id, const QPointF &pos, quint32 time) override;
    bool touchMotion(qint32 id, const QPointF &pos, quint32 time) override;
    bool touchUp(qint32 id, quint32 time) override;

    // for properties
    qreal lineWidth() const {
        return m_lineWidth;
    }
    int ringLife() const {
        return m_ringLife;
    }
    int ringSize() const {
        return m_ringMaxSize;
    }
    int ringCount() const {
        return m_ringCount;
    }

private:
    inline void drawCircle(const QColor& color, float cx, float cy, float r);
    inline void paintScreenSetup(int mask, QRegion region, ScreenPaintData& data);
    inline void paintScreenFinish(int mask, QRegion region, ScreenPaintData& data);

    void repaint();

    float computeAlpha(int time, int ring);
    float computeRadius(int time, bool press, int ring);
    void drawCircleGl(const QColor& color, float cx, float cy, float r);
    void drawCircleXr(const QColor& color, float cx, float cy, float r);
    void drawCircleQPainter(const QColor& color, float cx, float cy, float r);
    void paintScreenSetupGl(int mask, QRegion region, ScreenPaintData& data);
    void paintScreenFinishGl(int mask, QRegion region, ScreenPaintData& data);

    Qt::GlobalColor colorForId(quint32 id);

    int m_ringCount = 2;
    float m_lineWidth = 1.0;
    int m_ringLife = 300;
    float m_ringMaxSize = 20.0;

    struct TouchPoint {
        QPointF pos;
        int time = 0;
        bool press;
        QColor color;
    };
    QVector<TouchPoint> m_points;
    QHash<quint32, QPointF> m_latestPositions;
    QHash<quint32, Qt::GlobalColor> m_colors;
    std::chrono::milliseconds m_lastPresentTime = std::chrono::milliseconds::zero();

};

} // namespace

#endif