qxcbcursor.h

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// Copyright (C) 2022 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 QXCBCURSOR_H
#define QXCBCURSOR_H
 
#include <qpa/qplatformcursor.h>
#include "qxcbscreen.h"
#include <xcb/xcb_cursor.h>
 
#include <QtCore/QCache>
 
QT_BEGIN_NAMESPACE
 
#ifndef QT_NO_CURSOR
 
struct QXcbCursorCacheKey
{
    explicit QXcbCursorCacheKey(const QCursor &c);
    explicit QXcbCursorCacheKey(Qt::CursorShape s) : shape(s), bitmapCacheKey(0), maskCacheKey(0) {}
    QXcbCursorCacheKey() : shape(Qt::CustomCursor), bitmapCacheKey(0), maskCacheKey(0) {}
 
    Qt::CursorShape shape;
    qint64 bitmapCacheKey;
    qint64 maskCacheKey;
};
 
inline bool operator==(const QXcbCursorCacheKey &k1, const QXcbCursorCacheKey &k2)
{
    return k1.shape == k2.shape && k1.bitmapCacheKey == k2.bitmapCacheKey && k1.maskCacheKey == k2.maskCacheKey;
}
 
inline size_t qHash(const QXcbCursorCacheKey &k, size_t seed) noexcept
{
    return (size_t(k.shape) + size_t(k.bitmapCacheKey) + size_t(k.maskCacheKey)) ^ seed;
}
 
#endif // !QT_NO_CURSOR
 
class QXcbCursor : public QXcbObject, public QPlatformCursor
{
public:
    QXcbCursor(QXcbConnection *conn, QXcbScreen *screen);
    ~QXcbCursor();
#ifndef QT_NO_CURSOR
    void changeCursor(QCursor *cursor, QWindow *window) override;
#endif
    QPoint pos() const override;
    void setPos(const QPoint &pos) override;
 
    void updateContext();
 
    static void queryPointer(QXcbConnection *c, QXcbVirtualDesktop **virtualDesktop, QPoint *pos, int *keybMask = nullptr);
 
#ifndef QT_NO_CURSOR
    xcb_cursor_t xcbCursor(const QCursor &c) const
        { return m_cursorHash.value(QXcbCursorCacheKey(c), xcb_cursor_t(0)); }
#endif
 
private:
 
#ifndef QT_NO_CURSOR
    typedef QHash<QXcbCursorCacheKey, xcb_cursor_t> CursorHash;
 
    struct CachedCursor
    {
        explicit CachedCursor(xcb_connection_t *conn, xcb_cursor_t c)
            : cursor(c), connection(conn) {}
        ~CachedCursor() { xcb_free_cursor(connection, cursor); }
        xcb_cursor_t cursor;
        xcb_connection_t *connection;
    };
    typedef QCache<QXcbCursorCacheKey, CachedCursor> BitmapCursorCache;
 
    xcb_cursor_t createFontCursor(int cshape);
    xcb_cursor_t createBitmapCursor(QCursor *cursor);
    xcb_cursor_t createNonStandardCursor(int cshape);
#endif
 
    QXcbScreen *m_screen;
    xcb_cursor_context_t *m_cursorContext;
#ifndef QT_NO_CURSOR
    CursorHash m_cursorHash;
    BitmapCursorCache m_bitmapCache;
#endif
    static void cursorThemePropertyChanged(QXcbVirtualDesktop *screen,
                                           const QByteArray &name,
                                           const QVariant &property,
                                           void *handle);
    bool m_callbackForPropertyRegistered;
};
 
QT_END_NAMESPACE
 
#endif