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| ****************************************************************************/ |
| |
| #ifndef QPAINTDEVICE_H |
| #define QPAINTDEVICE_H |
| |
| #include <QtGui/qtguiglobal.h> |
| #include <QtGui/qwindowdefs.h> |
| #include <QtCore/qrect.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| |
| |
| class QPaintEngine; |
| class QPaintDevicePrivate; |
| |
| class Q_GUI_EXPORT QPaintDevice // device for QPainter |
| { |
| public: |
| enum PaintDeviceMetric { |
| PdmWidth = 1, |
| PdmHeight, |
| PdmWidthMM, |
| PdmHeightMM, |
| PdmNumColors, |
| PdmDepth, |
| PdmDpiX, |
| PdmDpiY, |
| PdmPhysicalDpiX, |
| PdmPhysicalDpiY, |
| PdmDevicePixelRatio, |
| PdmDevicePixelRatioScaled |
| }; |
| |
| 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); } |
| int devicePixelRatio() const { return metric(PdmDevicePixelRatio); } |
| qreal devicePixelRatioF() const { return metric(PdmDevicePixelRatioScaled) / devicePixelRatioFScale(); } |
| int colorCount() const { return metric(PdmNumColors); } |
| int depth() const { return metric(PdmDepth); } |
| |
| static inline qreal devicePixelRatioFScale() { return 0x10000; } |
| 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; |
| |
| ushort painters; // refcount |
| private: |
| Q_DISABLE_COPY(QPaintDevice) |
| |
| QPaintDevicePrivate *reserved; |
| |
| 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; } |
| |
| QT_END_NAMESPACE |
| |
| #endif // QPAINTDEVICE_H |