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39
40#include "qpaintdevice.h"
41
42QT_BEGIN_NAMESPACE
43
44QPaintDevice::QPaintDevice() noexcept
45{
46 painters = 0;
47}
48
49QPaintDevice::~QPaintDevice()
50{
51 if (paintingActive())
52 qWarning("QPaintDevice: Cannot destroy paint device that is being "
53 "painted");
54}
55
56
57/*!
58 \internal
59*/
60void QPaintDevice::initPainter(QPainter *) const
61{
62}
63
64/*!
65 \internal
66*/
67QPaintDevice *QPaintDevice::redirected(QPoint *) const
68{
69 return nullptr;
70}
71
72/*!
73 \internal
74*/
75QPainter *QPaintDevice::sharedPainter() const
76{
77 return nullptr;
78}
79
80Q_GUI_EXPORT int qt_paint_device_metric(const QPaintDevice *device, QPaintDevice::PaintDeviceMetric metric)
81{
82 return device->metric(metric);
83}
84
85int QPaintDevice::metric(PaintDeviceMetric m) const
86{
87 // Fallback: A subclass has not implemented PdmDevicePixelRatioScaled but might
88 // have implemented PdmDevicePixelRatio.
89 if (m == PdmDevicePixelRatioScaled)
90 return this->metric(PdmDevicePixelRatio) * devicePixelRatioFScale();
91
92 qWarning("QPaintDevice::metrics: Device has no metric information");
93
94 if (m == PdmDpiX) {
95 return 72;
96 } else if (m == PdmDpiY) {
97 return 72;
98 } else if (m == PdmNumColors) {
99 // FIXME: does this need to be a real value?
100 return 256;
101 } else if (m == PdmDevicePixelRatio) {
102 return 1;
103 } else {
104 qDebug("Unrecognised metric %d!",m);
105 return 0;
106 }
107}
108
109QT_END_NAMESPACE
110