qcursor.cpp

Go to the documentation of this file.

// Copyright (C) 2021 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
 
#include "qcursor.h"
 
#include <qcoreapplication.h>
#include <qbitmap.h>
#include <qimage.h>
#include <qdatastream.h>
#include <qvariant.h>
#include <private/qcursor_p.h>
#include <qdebug.h>
 
#include <qpa/qplatformcursor.h>
#include <private/qguiapplication_p.h>
#include <private/qhighdpiscaling_p.h>
 
QT_BEGIN_NAMESPACE
 
QPoint QCursor::pos(const QScreen *screen)
{
    if (screen) {
        if (const QPlatformCursor *cursor = screen->handle()->cursor()) {
            const QPlatformScreen *ps = screen->handle();
            QPoint nativePos = cursor->pos();
            ps = ps->screenForPosition(nativePos);
            return QHighDpi::fromNativePixels(nativePos, ps->screen());
        }
    }
    return QGuiApplicationPrivate::lastCursorPosition.toPoint();
}
 
QPoint QCursor::pos()
{
    return QCursor::pos(QGuiApplication::primaryScreen());
}
 
void QCursor::setPos(QScreen *screen, int x, int y)
{
    if (screen) {
        if (QPlatformCursor *cursor = screen->handle()->cursor()) {
            const QPoint pos(x, y);
            const QPoint devicePos = QHighDpi::toNativePixels(pos, screen->virtualSiblingAt(pos));
            // Need to check, since some X servers generate null mouse move
            // events, causing looping in applications which call setPos() on
            // every mouse move event.
            if (devicePos != cursor->pos())
                cursor->setPos(devicePos);
        }
    }
}
 
void QCursor::setPos(int x, int y)
{
    QCursor::setPos(QGuiApplication::primaryScreen(), x, y);
}
 
#ifndef QT_NO_CURSOR
 
/*****************************************************************************
  QCursor stream functions
 *****************************************************************************/
 
#ifndef QT_NO_DATASTREAM
 
 
QDataStream &operator<<(QDataStream &s, const QCursor &c)
{
    s << (qint16)c.shape();                        // write shape id to stream
    if (c.shape() == Qt::BitmapCursor) {                // bitmap cursor
        bool isPixmap = false;
        if (s.version() >= 7) {
            isPixmap = !c.pixmap().isNull();
            s << isPixmap;
        }
        if (isPixmap)
            s << c.pixmap();
        else
            s << c.bitmap() << c.mask();
        s << c.hotSpot();
    }
    return s;
}
 
QDataStream &operator>>(QDataStream &s, QCursor &c)
{
    qint16 shape;
    s >> shape;                                        // read shape id from stream
    if (shape == Qt::BitmapCursor) {                // read bitmap cursor
        bool isPixmap = false;
        if (s.version() >= 7)
            s >> isPixmap;
        if (isPixmap) {
            QPixmap pm;
            QPoint hot;
            s >> pm >> hot;
            c = QCursor(pm, hot.x(), hot.y());
        } else {
            QBitmap bm, bmm;
            QPoint hot;
            s >> bm >> bmm >> hot;
            c = QCursor(bm, bmm, hot.x(), hot.y());
        }
    } else {
        c.setShape((Qt::CursorShape)shape);                // create cursor with shape
    }
    return s;
}
#endif // QT_NO_DATASTREAM
 
 
QCursor::QCursor(const QPixmap &pixmap, int hotX, int hotY)
    : d(nullptr)
{
    QImage img = pixmap.toImage().convertToFormat(QImage::Format_Indexed8, Qt::ThresholdDither|Qt::AvoidDither);
    QBitmap bm = QBitmap::fromImage(img, Qt::ThresholdDither|Qt::AvoidDither);
    QBitmap bmm = pixmap.mask();
    if (!bmm.isNull()) {
        QBitmap nullBm;
        bm.setMask(nullBm);
    }
    else if (!pixmap.mask().isNull()) {
        QImage mimg = pixmap.mask().toImage().convertToFormat(QImage::Format_Indexed8, Qt::ThresholdDither|Qt::AvoidDither);
        bmm = QBitmap::fromImage(mimg, Qt::ThresholdDither|Qt::AvoidDither);
    }
    else {
        bmm = QBitmap(bm.size());
        bmm.fill(Qt::color1);
    }
 
    d = QCursorData::setBitmap(bm, bmm, hotX, hotY, pixmap.devicePixelRatio());
    d->pixmap = pixmap;
}
 
 
 
QCursor::QCursor(const QBitmap &bitmap, const QBitmap &mask, int hotX, int hotY)
    : d(nullptr)
{
    d = QCursorData::setBitmap(bitmap, mask, hotX, hotY, 1.0);
}
 
QCursor::QCursor()
{
    if (!QCursorData::initialized) {
        if (QCoreApplication::startingUp()) {
            d = nullptr;
            return;
        }
        QCursorData::initialize();
    }
    QCursorData *c = qt_cursorTable[0];
    c->ref.ref();
    d = c;
}
 
QCursor::QCursor(Qt::CursorShape shape)
    : d(nullptr)
{
    if (!QCursorData::initialized)
        QCursorData::initialize();
    setShape(shape);
}
 
bool operator==(const QCursor &lhs, const QCursor &rhs) noexcept
{
    if (lhs.d == rhs.d)
        return true; // Copy or same shape
 
    // Check pixmaps or bitmaps cache keys. Notice that having BitmapCursor
    // shape implies either non-null pixmap or non-null bitmap and mask
    if (lhs.shape() == Qt::BitmapCursor && rhs.shape() == Qt::BitmapCursor
            && lhs.hotSpot() == rhs.hotSpot()) {
        if (!lhs.d->pixmap.isNull())
            return lhs.d->pixmap.cacheKey() == rhs.d->pixmap.cacheKey();
 
        if (!rhs.d->pixmap.isNull())
            return false;
 
        return lhs.d->bm->cacheKey() == rhs.d->bm->cacheKey()
                && lhs.d->bmm->cacheKey() == rhs.d->bmm->cacheKey();
    }
 
    return false;
}
 
Qt::CursorShape QCursor::shape() const
{
    if (!QCursorData::initialized)
        QCursorData::initialize();
    return d->cshape;
}
 
void QCursor::setShape(Qt::CursorShape shape)
{
    if (!QCursorData::initialized)
        QCursorData::initialize();
    QCursorData *c = uint(shape) <= Qt::LastCursor ? qt_cursorTable[shape] : nullptr;
    if (!c)
        c = qt_cursorTable[0];
    c->ref.ref();
    if (!d) {
        d = c;
    } else {
        if (!d->ref.deref())
            delete d;
        d = c;
    }
}
 
QBitmap QCursor::bitmap() const
{
    if (!QCursorData::initialized)
        QCursorData::initialize();
    if (d->bm)
        return *(d->bm);
    return QBitmap();
}
 
QBitmap QCursor::mask() const
{
    if (!QCursorData::initialized)
        QCursorData::initialize();
    if (d->bmm)
        return *(d->bmm);
    return QBitmap();
}
 
QPixmap QCursor::pixmap() const
{
    if (!QCursorData::initialized)
        QCursorData::initialize();
    return d->pixmap;
}
 
QPoint QCursor::hotSpot() const
{
    if (!QCursorData::initialized)
        QCursorData::initialize();
    return QPoint(d->hx, d->hy);
}
 
QCursor::QCursor(const QCursor &c)
{
    if (!QCursorData::initialized)
        QCursorData::initialize();
    d = c.d;
    d->ref.ref();
}
 
QCursor::~QCursor()
{
    if (d && !d->ref.deref())
        delete d;
}
 
 
QCursor &QCursor::operator=(const QCursor &c)
{
    if (!QCursorData::initialized)
        QCursorData::initialize();
    if (c.d)
        c.d->ref.ref();
    if (d && !d->ref.deref())
        delete d;
    d = c.d;
    return *this;
}
 
QCursor::operator QVariant() const
{
    return QVariant::fromValue(*this);
}
 
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug dbg, const QCursor &c)
{
    QDebugStateSaver saver(dbg);
    dbg.nospace() << "QCursor(Qt::CursorShape(" << c.shape() << "))";
    return dbg;
}
#endif
 
/*****************************************************************************
  Internal QCursorData class
 *****************************************************************************/
 
QCursorData *qt_cursorTable[Qt::LastCursor + 1];
bool QCursorData::initialized = false;
 
QCursorData::QCursorData(Qt::CursorShape s)
    : ref(1), cshape(s), bm(nullptr), bmm(nullptr), hx(0), hy(0)
{
}
 
QCursorData::~QCursorData()
{
    delete bm;
    delete bmm;
}
 
void QCursorData::cleanup()
{
    if (!QCursorData::initialized)
        return;
 
    for (int shape = 0; shape <= Qt::LastCursor; ++shape) {
        // In case someone has a static QCursor defined with this shape
        if (!qt_cursorTable[shape]->ref.deref())
            delete qt_cursorTable[shape];
        qt_cursorTable[shape] = nullptr;
    }
    QCursorData::initialized = false;
}
 
void QCursorData::initialize()
{
    if (QCursorData::initialized)
        return;
    for (int shape = 0; shape <= Qt::LastCursor; ++shape)
        qt_cursorTable[shape] = new QCursorData((Qt::CursorShape)shape);
    QCursorData::initialized = true;
}
 
QCursorData *QCursorData::setBitmap(const QBitmap &bitmap, const QBitmap &mask, int hotX, int hotY, qreal devicePixelRatio)
{
    if (!QCursorData::initialized)
        QCursorData::initialize();
    if (bitmap.depth() != 1 || mask.depth() != 1 || bitmap.size() != mask.size()) {
        qWarning("QCursor: Cannot create bitmap cursor; invalid bitmap(s)");
        QCursorData *c = qt_cursorTable[0];
        c->ref.ref();
        return c;
    }
    QCursorData *d = new QCursorData;
    d->bm  = new QBitmap(bitmap);
    d->bmm = new QBitmap(mask);
    d->cshape = Qt::BitmapCursor;
    d->hx = hotX >= 0 ? hotX : bitmap.width() / 2 / devicePixelRatio;
    d->hy = hotY >= 0 ? hotY : bitmap.height() / 2 / devicePixelRatio;
 
    return d;
}
 
void QCursorData::update()
{
}
 
QT_END_NAMESPACE
#endif // QT_NO_CURSOR