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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;
52class QPaintDevicePrivate;
53
54class Q_GUI_EXPORT QPaintDevice // device for QPainter
55{
56public:
57 enum PaintDeviceMetric {
58 PdmWidth = 1,
59 PdmHeight,
60 PdmWidthMM,
61 PdmHeightMM,
62 PdmNumColors,
63 PdmDepth,
64 PdmDpiX,
65 PdmDpiY,
66 PdmPhysicalDpiX,
67 PdmPhysicalDpiY,
68 PdmDevicePixelRatio,
69 PdmDevicePixelRatioScaled
70 };
71
72 virtual ~QPaintDevice();
73
74 virtual int devType() const;
75 bool paintingActive() const;
76 virtual QPaintEngine *paintEngine() const = 0;
77
78 int width() const { return metric(PdmWidth); }
79 int height() const { return metric(PdmHeight); }
80 int widthMM() const { return metric(PdmWidthMM); }
81 int heightMM() const { return metric(PdmHeightMM); }
82 int logicalDpiX() const { return metric(PdmDpiX); }
83 int logicalDpiY() const { return metric(PdmDpiY); }
84 int physicalDpiX() const { return metric(PdmPhysicalDpiX); }
85 int physicalDpiY() const { return metric(PdmPhysicalDpiY); }
86 int devicePixelRatio() const { return metric(PdmDevicePixelRatio); }
87 qreal devicePixelRatioF() const { return metric(PdmDevicePixelRatioScaled) / devicePixelRatioFScale(); }
88 int colorCount() const { return metric(PdmNumColors); }
89 int depth() const { return metric(PdmDepth); }
90
91 static inline qreal devicePixelRatioFScale() { return 0x10000; }
92protected:
93 QPaintDevice() Q_DECL_NOEXCEPT;
94 virtual int metric(PaintDeviceMetric metric) const;
95 virtual void initPainter(QPainter *painter) const;
96 virtual QPaintDevice *redirected(QPoint *offset) const;
97 virtual QPainter *sharedPainter() const;
98
99 ushort painters; // refcount
100private:
101 Q_DISABLE_COPY(QPaintDevice)
102
103 QPaintDevicePrivate *reserved;
104
105 friend class QPainter;
106 friend class QPainterPrivate;
107 friend class QFontEngineMac;
108 friend class QX11PaintEngine;
109 friend Q_GUI_EXPORT int qt_paint_device_metric(const QPaintDevice *device, PaintDeviceMetric metric);
110};
111
112/*****************************************************************************
113 Inline functions
114 *****************************************************************************/
115
116inline int QPaintDevice::devType() const
117{ return QInternal::UnknownDevice; }
118
119inline bool QPaintDevice::paintingActive() const
120{ return painters != 0; }
121
122QT_END_NAMESPACE
123
124#endif // QPAINTDEVICE_H
125