qfonticonengine_p.h

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// 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