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
4#ifndef QPLATFORMSCREEN_H
5#define QPLATFORMSCREEN_H
6
7//
8// W A R N I N G
9// -------------
10//
11// This file is part of the QPA API and is not meant to be used
12// in applications. Usage of this API may make your code
13// source and binary incompatible with future versions of Qt.
14//
15
16#include <QtGui/qtguiglobal.h>
17#include <QtCore/qmetatype.h>
18#include <QtCore/qnamespace.h>
19#include <QtCore/qcoreevent.h>
20#include <QtCore/qvariant.h>
21#include <QtCore/qrect.h>
22#include <QtCore/qobject.h>
23
24#include <QtGui/qcolorspace.h>
25#include <QtGui/qcursor.h>
26#include <QtGui/qimage.h>
27#include <QtGui/qwindowdefs.h>
28#include <qpa/qplatformpixmap.h>
29
30QT_BEGIN_NAMESPACE
31
32
33class QPlatformBackingStore;
34class QPlatformScreenPrivate;
35class QPlatformWindow;
36class QPlatformCursor;
37class QScreen;
38class QSurfaceFormat;
39
40typedef QPair<qreal, qreal> QDpi;
41
42
43class Q_GUI_EXPORT QPlatformScreen
44{
45 Q_GADGET
46 Q_DECLARE_PRIVATE(QPlatformScreen)
47
48public:
49 Q_DISABLE_COPY_MOVE(QPlatformScreen)
50
51 enum SubpixelAntialiasingType { // copied from qfontengine_p.h since we can't include private headers
52 Subpixel_None,
53 Subpixel_RGB,
54 Subpixel_BGR,
55 Subpixel_VRGB,
56 Subpixel_VBGR
57 };
58
59 enum PowerState {
60 PowerStateOn,
61 PowerStateStandby,
62 PowerStateSuspend,
63 PowerStateOff
64 };
65
66 struct Mode {
67 QSize size;
68 qreal refreshRate;
69 };
70
71 QPlatformScreen();
72 virtual ~QPlatformScreen();
73
74 virtual bool isPlaceholder() const { return false; }
75
76 virtual QPixmap grabWindow(WId window, int x, int y, int width, int height) const;
77
78 virtual QRect geometry() const = 0;
79 virtual QRect availableGeometry() const {return geometry();}
80
81 virtual int depth() const = 0;
82 virtual QImage::Format format() const = 0;
83 virtual QColorSpace colorSpace() const { return QColorSpace::SRgb; }
84
85 virtual QSizeF physicalSize() const;
86 virtual QDpi logicalDpi() const;
87 virtual QDpi logicalBaseDpi() const;
88 virtual qreal devicePixelRatio() const;
89
90 virtual qreal refreshRate() const;
91
92 virtual Qt::ScreenOrientation nativeOrientation() const;
93 virtual Qt::ScreenOrientation orientation() const;
94
95 virtual QWindow *topLevelAt(const QPoint &point) const;
96 QWindowList windows() const;
97
98 virtual QList<QPlatformScreen *> virtualSiblings() const;
99 const QPlatformScreen *screenForPosition(const QPoint &point) const;
100
101 QScreen *screen() const;
102
103 //jl: should this function be in QPlatformIntegration
104 //jl: maybe screenForWindow is a better name?
105 static QPlatformScreen *platformScreenForWindow(const QWindow *window);
106
107 virtual QString name() const { return QString(); }
108
109 virtual QString manufacturer() const;
110 virtual QString model() const;
111 virtual QString serialNumber() const;
112
113 virtual QPlatformCursor *cursor() const;
114 virtual SubpixelAntialiasingType subpixelAntialiasingTypeHint() const;
115
116 virtual PowerState powerState() const;
117 virtual void setPowerState(PowerState state);
118
119 virtual QList<Mode> modes() const;
120
121 virtual int currentMode() const;
122 virtual int preferredMode() const;
123
124 static int angleBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b);
125 static QTransform transformBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b, const QRect &target);
126 static QRect mapBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b, const QRect &rect);
127
128 static QDpi overrideDpi(const QDpi &in);
129
130protected:
131 void resizeMaximizedWindows();
132
133 QScopedPointer<QPlatformScreenPrivate> d_ptr;
134
135private:
136 friend class QScreen;
137};
138
139// Qt doesn't currently support running with no platform screen
140// QPA plugins can use this class to create a fake screen
141class Q_GUI_EXPORT QPlatformPlaceholderScreen : public QPlatformScreen {
142public:
143 // virtualSibling can be passed in to make the placeholder a sibling with other screens during
144 // the transitioning phase when the real screen is about to be removed, or the first real screen
145 // is about to be added. This is useful because Qt will currently recreate (but now show!)
146 // windows when they are moved from one virtual desktop to another, so if the last monitor is
147 // unplugged, then plugged in again, windows will be hidden unless the placeholder belongs to
148 // the same virtual desktop as the other screens.
149 QPlatformPlaceholderScreen(bool virtualSibling = true) : m_virtualSibling(virtualSibling) {}
150 bool isPlaceholder() const override { return true; }
151 QRect geometry() const override { return QRect(); }
152 QRect availableGeometry() const override { return QRect(); }
153 int depth() const override { return 32; }
154 QImage::Format format() const override { return QImage::Format::Format_RGB32; }
155 QList<QPlatformScreen *> virtualSiblings() const override;
156private:
157 bool m_virtualSibling = true;
158};
159
160QT_END_NAMESPACE
161
162#endif // QPLATFORMSCREEN_H
163

source code of qtbase/src/gui/kernel/qplatformscreen.h