qwindowsiconengine.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 QWINDOWSICONENGINE_H
#define QWINDOWSICONENGINE_H
 
#include <QtCore/qt_windows.h>
 
#include <QtGui/qfont.h>
#include <QtGui/qiconengine.h>
 
QT_BEGIN_NAMESPACE
 
class QWindowsIconEngine : public QIconEngine
{
public:
    QWindowsIconEngine(const QString &iconName);
    ~QWindowsIconEngine();
    QIconEngine *clone() const override;
    QString key() const override;
    QString iconName() override;
    bool isNull() 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;
 
private:
    static constexpr quint64 calculateCacheKey(QIcon::Mode mode, QIcon::State state)
    {
        return (quint64(mode) << 32) | state;
    }
 
    QString glyphs() const;
 
    const QString m_iconName;
    const QFont m_iconFont;
    const QString m_glyphs;
    mutable QPixmap m_pixmap;
    mutable quint64 m_cacheKey = {};
};
 
QT_END_NAMESPACE
 
#endif // QWINDOWSICONENGINE_H