qpaintdevice.h - mozsearch

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// Copyright (C) 2016 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

// Qt-Security score:significant reason:default

#ifndef QPAINTDEVICE_H

#define QPAINTDEVICE_H

#include <QtGui/qtguiglobal.h>

#include <QtGui/qwindowdefs.h>

#include <QtCore/qrect.h>

QT_BEGIN_NAMESPACE

class QPaintEngine;

class Q_GUI_EXPORT QPaintDevice                                // device for QPainter

public:

    enum PaintDeviceMetric {

        PdmWidth = 1,

        PdmHeight,

        PdmWidthMM,

        PdmHeightMM,

        PdmNumColors,

        PdmDepth,

        PdmDpiX,

        PdmDpiY,

        PdmPhysicalDpiX,

        PdmPhysicalDpiY,

        PdmDevicePixelRatio,

        PdmDevicePixelRatioScaled,

        PdmDevicePixelRatioF_EncodedA,

        PdmDevicePixelRatioF_EncodedB,

};

    virtual ~QPaintDevice();

    virtual int devType() const;

    bool paintingActive() const;

    virtual QPaintEngine *paintEngine() const = 0;

    int width() const { return metric(PdmWidth); }

    int height() const { return metric(PdmHeight); }

    int widthMM() const { return metric(PdmWidthMM); }

    int heightMM() const { return metric(PdmHeightMM); }

    int logicalDpiX() const { return metric(PdmDpiX); }

    int logicalDpiY() const { return metric(PdmDpiY); }

    int physicalDpiX() const { return metric(PdmPhysicalDpiX); }

    int physicalDpiY() const { return metric(PdmPhysicalDpiY); }

    qreal devicePixelRatio() const;

    qreal devicePixelRatioF()  const { return devicePixelRatio(); }

    int colorCount() const { return metric(PdmNumColors); }

    int depth() const { return metric(PdmDepth); }

    static inline qreal devicePixelRatioFScale() { return 0x10000; }

    static inline int encodeMetricF(PaintDeviceMetric metric, double value);

protected:

    QPaintDevice() noexcept;

    virtual int metric(PaintDeviceMetric metric) const;

    virtual void initPainter(QPainter *painter) const;

    virtual QPaintDevice *redirected(QPoint *offset) const;

    virtual QPainter *sharedPainter() const;

    double getDecodedMetricF(PaintDeviceMetric metricA, PaintDeviceMetric metricB) const;

    ushort        painters;                        // refcount

private:

    Q_DISABLE_COPY(QPaintDevice)

    friend class QPainter;

    friend class QPainterPrivate;

    friend class QFontEngineMac;

    friend class QX11PaintEngine;

    friend Q_GUI_EXPORT int qt_paint_device_metric(const QPaintDevice *device, PaintDeviceMetric metric);

};

/*****************************************************************************

  Inline functions

 *****************************************************************************/

inline int QPaintDevice::devType() const

{ return QInternal::UnknownDevice; }

inline bool QPaintDevice::paintingActive() const

{ return painters != 0; }

inline int QPaintDevice::encodeMetricF(PaintDeviceMetric metric, double value)

    qint32 buf[2];

    Q_STATIC_ASSERT(sizeof(buf) == sizeof(double));

    memcpy(buf, &value, sizeof(buf));

    return buf[metric & 1];

QT_END_NAMESPACE

#endif // QPAINTDEVICE_H