// Copyright (C) 2023 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QFONTICONENGINE_H

#define QFONTICONENGINE_H

#include <QtGui/qiconengine.h>

#ifndef QT_NO_ICON

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <QtGui/qfont.h>

QT_BEGIN_NAMESPACE

using glyph_t = quint32;

class Q_GUI_EXPORT QFontIconEngine : public QIconEngine

{

public:

    QFontIconEngine(const QString &iconName, const QFont &font);

    ~QFontIconEngine();

    QString iconName() override;

    bool isNull() override;

    QString key() const override;

    QIconEngine *clone() const override;

    QList<QSize> availableSizes(QIcon::Mode, QIcon::State) override;

    QSize actualSize(const QSize &size, QIcon::Mode mode, QIcon::State state) override;

    QPixmap pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state) override;

    QPixmap scaledPixmap(const QSize &size, QIcon::Mode mode, QIcon::State state, qreal scale) override;

    void paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state) override;

protected:

    virtual QString string() const;

    virtual glyph_t glyph() const;

private:

    static constexpr quint64 calculateCacheKey(QIcon::Mode mode, QIcon::State state)

    {

        return (quint64(mode) << 32) | state;

    }

    const QString m_iconName;

    const QFont m_iconFont;

    mutable QPixmap m_pixmap;

    mutable quint64 m_pixmapCacheKey = {};

    static constexpr glyph_t uninitializedGlyph = std::numeric_limits<glyph_t>::max();

    mutable glyph_t m_glyph = uninitializedGlyph;

};

QT_END_NAMESPACE

#endif // QT_NO_ICON

#endif // QFONTICONENGINE_H