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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
#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
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