/src/qtbase/src/gui/painting/qpaintdevice.cpp

Source
// 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
// Qt-Security score:significant reason:default

#include "qpaintdevice.h"

QT_BEGIN_NAMESPACE

QPaintDevice::QPaintDevice() noexcept
{
    painters = 0;
}

QPaintDevice::~QPaintDevice()
{
    if (paintingActive())
        qWarning("QPaintDevice: Cannot destroy paint device that is being "
                  "painted");
}

/*!
    \internal
*/
// ### Qt 7: Replace this workaround mechanism: virtual devicePixelRatio() and virtual metricF()
double QPaintDevice::getDecodedMetricF(PaintDeviceMetric metricA, PaintDeviceMetric metricB) const
{
    qint32 buf[2];
    // The Encoded metric enum values come in pairs of one odd and one even value.
    // We map those to the 0 and 1 indexes of buf by taking just the least significant bit.
    // Same mapping here as in the encodeMetricF() function, to ensure correct order.
    buf[metricA & 1] = metric(metricA);
    buf[metricB & 1] = metric(metricB);
    double res;
    memcpy(&res, buf, sizeof(res));
    return res;
}

qreal QPaintDevice::devicePixelRatio() const
{
    Q_STATIC_ASSERT((PdmDevicePixelRatioF_EncodedA & 1) != (PdmDevicePixelRatioF_EncodedB & 1));
    double res;
    int scaledDpr = metric(PdmDevicePixelRatioScaled);
    if (scaledDpr == int(devicePixelRatioFScale())) {
        res = 1; // Shortcut for common case
    } else if (scaledDpr == 2 * int(devicePixelRatioFScale())) {
        res = 2; // Shortcut for common case
    } else {
        res = getDecodedMetricF(PdmDevicePixelRatioF_EncodedA, PdmDevicePixelRatioF_EncodedB);
        if (res <= 0) // These metrics not implemented, fall back to PdmDevicePixelRatioScaled
            res = scaledDpr / devicePixelRatioFScale();
    }
    return res;
}

/*!
    \internal
*/
void QPaintDevice::initPainter(QPainter *) const
{
}

/*!
    \internal
*/
QPaintDevice *QPaintDevice::redirected(QPoint *) const
{
    return nullptr;
}

/*!
    \internal
*/
QPainter *QPaintDevice::sharedPainter() const
{
    return nullptr;
}

Q_GUI_EXPORT int qt_paint_device_metric(const QPaintDevice *device, QPaintDevice::PaintDeviceMetric metric)
{
    return device->metric(metric);
}

int QPaintDevice::metric(PaintDeviceMetric m) const
{
    // Fallback: A subclass has not implemented PdmDevicePixelRatioScaled but might
    // have implemented PdmDevicePixelRatio.
    if (m == PdmDevicePixelRatioScaled)
        return this->metric(PdmDevicePixelRatio) * devicePixelRatioFScale();
    if (m == PdmNumColors)
        return 0;
    if (m == PdmDevicePixelRatio)
        return 1;

    qWarning("QPaintDevice::metrics: Device has no metric information");

    switch (m) {
    case PdmDevicePixelRatioScaled:
    case PdmDevicePixelRatio:
    case PdmNumColors:
        Q_UNREACHABLE();
        break;
    case PdmDpiX:
    case PdmDpiY:
        return 72;
    case PdmDevicePixelRatioF_EncodedA:
    case PdmDevicePixelRatioF_EncodedB:
        return 0;
    case PdmWidth:
    case PdmHeight:
    case PdmWidthMM:
    case PdmHeightMM:
    case PdmDepth:
    case PdmPhysicalDpiX:
    case PdmPhysicalDpiY:
        return 0;
    }
    qDebug("Unrecognized metric %d!", m);
    return 0;
}

QT_END_NAMESPACE

Line	Count	Source
1		// Copyright (C) 2016 The Qt Company Ltd.
2		// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3		// Qt-Security score:significant reason:default
4
5		#include "qpaintdevice.h"
6
7		QT_BEGIN_NAMESPACE
8
9		QPaintDevice::QPaintDevice() noexcept
10	386M	{
11	386M	painters = 0;
12	386M	}
13
14		QPaintDevice::~QPaintDevice()
15	386M	{
16	386M	if (paintingActive())
17	386M	qWarning("QPaintDevice: Cannot destroy paint device that is being "
18	0	"painted");
19	386M	}
20
21		/*!
22		\internal
23		*/
24		// ### Qt 7: Replace this workaround mechanism: virtual devicePixelRatio() and virtual metricF()
25		double QPaintDevice::getDecodedMetricF(PaintDeviceMetric metricA, PaintDeviceMetric metricB) const
26	0	{
27	0	qint32 buf[2];
28		// The Encoded metric enum values come in pairs of one odd and one even value.
29		// We map those to the 0 and 1 indexes of buf by taking just the least significant bit.
30		// Same mapping here as in the encodeMetricF() function, to ensure correct order.
31	0	buf[metricA & 1] = metric(metricA);
32	0	buf[metricB & 1] = metric(metricB);
33	0	double res;
34	0	memcpy(&res, buf, sizeof(res));
35	0	return res;
36	0	}
37
38		qreal QPaintDevice::devicePixelRatio() const
39	132k	{
40	132k	Q_STATIC_ASSERT((PdmDevicePixelRatioF_EncodedA & 1) != (PdmDevicePixelRatioF_EncodedB & 1));
41	132k	double res;
42	132k	int scaledDpr = metric(PdmDevicePixelRatioScaled);
43	132k	if (scaledDpr == int(devicePixelRatioFScale())) {
44	132k	res = 1; // Shortcut for common case
45	132k	} else if (scaledDpr == 2 * int(devicePixelRatioFScale())) {
46	0	res = 2; // Shortcut for common case
47	0	} else {
48	0	res = getDecodedMetricF(PdmDevicePixelRatioF_EncodedA, PdmDevicePixelRatioF_EncodedB);
49	0	if (res <= 0) // These metrics not implemented, fall back to PdmDevicePixelRatioScaled
50	0	res = scaledDpr / devicePixelRatioFScale();
51	0	}
52	132k	return res;
53	132k	}
54
55		/*!
56		\internal
57		*/
58		void QPaintDevice::initPainter(QPainter *) const
59	109k	{
60	109k	}
61
62		/*!
63		\internal
64		*/
65		QPaintDevice QPaintDevice::redirected(QPoint ) const
66	109k	{
67	109k	return nullptr;
68	109k	}
69
70		/*!
71		\internal
72		*/
73		QPainter *QPaintDevice::sharedPainter() const
74	219k	{
75	219k	return nullptr;
76	219k	}
77
78		Q_GUI_EXPORT int qt_paint_device_metric(const QPaintDevice *device, QPaintDevice::PaintDeviceMetric metric)
79	0	{
80	0	return device->metric(metric);
81	0	}
82
83		int QPaintDevice::metric(PaintDeviceMetric m) const
84	0	{
85		// Fallback: A subclass has not implemented PdmDevicePixelRatioScaled but might
86		// have implemented PdmDevicePixelRatio.
87	0	if (m == PdmDevicePixelRatioScaled)
88	0	return this->metric(PdmDevicePixelRatio) * devicePixelRatioFScale();
89	0	if (m == PdmNumColors)
90	0	return 0;
91	0	if (m == PdmDevicePixelRatio)
92	0	return 1;
93
94	0	qWarning("QPaintDevice::metrics: Device has no metric information");
95
96	0	switch (m) {
97	0	case PdmDevicePixelRatioScaled:
98	0	case PdmDevicePixelRatio:
99	0	case PdmNumColors:
100	0	Q_UNREACHABLE();
101	0	break;
102	0	case PdmDpiX:
103	0	case PdmDpiY:
104	0	return 72;
105	0	case PdmDevicePixelRatioF_EncodedA:
106	0	case PdmDevicePixelRatioF_EncodedB:
107	0	return 0;
108	0	case PdmWidth:
109	0	case PdmHeight:
110	0	case PdmWidthMM:
111	0	case PdmHeightMM:
112	0	case PdmDepth:
113	0	case PdmPhysicalDpiX:
114	0	case PdmPhysicalDpiY:
115	0	return 0;
116	0	}
117	0	qDebug("Unrecognized metric %d!", m);
118	0	return 0;
119	0	}
120
121		QT_END_NAMESPACE

Coverage Report

Created: 2026-02-26 07:48