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39
40#ifndef QPAINTDEVICE_H
41#define QPAINTDEVICE_H
42
43#include <QtGui/qtguiglobal.h>
44#include <QtGui/qwindowdefs.h>
45#include <QtCore/qrect.h>
46
47QT_BEGIN_NAMESPACE
48
49
50
51class QPaintEngine;
52
53class Q_GUI_EXPORT QPaintDevice // device for QPainter
54{
55public:
56 enum PaintDeviceMetric {
57 PdmWidth = 1,
58 PdmHeight,
59 PdmWidthMM,
60 PdmHeightMM,
61 PdmNumColors,
62 PdmDepth,
63 PdmDpiX,
64 PdmDpiY,
65 PdmPhysicalDpiX,
66 PdmPhysicalDpiY,
67 PdmDevicePixelRatio,
68 PdmDevicePixelRatioScaled
69 };
70
71 virtual ~QPaintDevice();
72
73 virtual int devType() const;
74 bool paintingActive() const;
75 virtual QPaintEngine *paintEngine() const = 0;
76
77 int width() const { return metric(PdmWidth); }
78 int height() const { return metric(PdmHeight); }
79 int widthMM() const { return metric(PdmWidthMM); }
80 int heightMM() const { return metric(PdmHeightMM); }
81 int logicalDpiX() const { return metric(PdmDpiX); }
82 int logicalDpiY() const { return metric(PdmDpiY); }
83 int physicalDpiX() const { return metric(PdmPhysicalDpiX); }
84 int physicalDpiY() const { return metric(PdmPhysicalDpiY); }
85 qreal devicePixelRatio() const { return metric(PdmDevicePixelRatioScaled) / devicePixelRatioFScale(); }
86 qreal devicePixelRatioF() const { return devicePixelRatio(); }
87 int colorCount() const { return metric(PdmNumColors); }
88 int depth() const { return metric(PdmDepth); }
89
90 static inline qreal devicePixelRatioFScale() { return 0x10000; }
91protected:
92 QPaintDevice() noexcept;
93 virtual int metric(PaintDeviceMetric metric) const;
94 virtual void initPainter(QPainter *painter) const;
95 virtual QPaintDevice *redirected(QPoint *offset) const;
96 virtual QPainter *sharedPainter() const;
97
98 ushort painters; // refcount
99private:
100 Q_DISABLE_COPY(QPaintDevice)
101
102 friend class QPainter;
103 friend class QPainterPrivate;
104 friend class QFontEngineMac;
105 friend class QX11PaintEngine;
106 friend Q_GUI_EXPORT int qt_paint_device_metric(const QPaintDevice *device, PaintDeviceMetric metric);
107};
108
109/*****************************************************************************
110 Inline functions
111 *****************************************************************************/
112
113inline int QPaintDevice::devType() const
114{ return QInternal::UnknownDevice; }
115
116inline bool QPaintDevice::paintingActive() const
117{ return painters != 0; }
118
119QT_END_NAMESPACE
120
121#endif // QPAINTDEVICE_H
122