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39 
40 #ifndef QPLATFORMSCREEN_H
41 #define QPLATFORMSCREEN_H
42 
43 //
44 //  W A R N I N G
45 //  -------------
46 //
47 // This file is part of the QPA API and is not meant to be used
48 // in applications. Usage of this API may make your code
49 // source and binary incompatible with future versions of Qt.
50 //
51 
52 #include <QtGui/qtguiglobal.h>
53 #include <QtCore/qmetatype.h>
54 #include <QtCore/qnamespace.h>
55 #include <QtCore/qcoreevent.h>
56 #include <QtCore/qvariant.h>
57 #include <QtCore/qrect.h>
58 #include <QtCore/qobject.h>
59 
60 #include <QtGui/qcursor.h>
61 #include <QtGui/qimage.h>
62 #include <QtGui/qwindowdefs.h>
63 #include <qpa/qplatformpixmap.h>
64 
65 QT_BEGIN_NAMESPACE
66 
67 
68 class QPlatformBackingStore;
69 class QPlatformScreenPrivate;
70 class QPlatformWindow;
71 class QPlatformCursor;
72 class QScreen;
73 class QSurfaceFormat;
74 
75 typedef QPair<qreal, qreal> QDpi;
76 
77 
78 class Q_GUI_EXPORT QPlatformScreen
79 {
80     Q_DECLARE_PRIVATE(QPlatformScreen)
81 
82 public:
83     Q_DISABLE_COPY_MOVE(QPlatformScreen)
84 
85     enum SubpixelAntialiasingType { // copied from qfontengine_p.h since we can't include private headers
86         Subpixel_None,
87         Subpixel_RGB,
88         Subpixel_BGR,
89         Subpixel_VRGB,
90         Subpixel_VBGR
91     };
92 
93     enum PowerState {
94         PowerStateOn,
95         PowerStateStandby,
96         PowerStateSuspend,
97         PowerStateOff
98     };
99 
100     struct Mode {
101         QSize size;
102         qreal refreshRate;
103     };
104 
105     QPlatformScreen();
106     virtual ~QPlatformScreen();
107 
isPlaceholder()108     virtual bool isPlaceholder() const { return false; }
109 
110     virtual QPixmap grabWindow(WId window, int x, int y, int width, int height) const;
111 
112     virtual QRect geometry() const = 0;
availableGeometry()113     virtual QRect availableGeometry() const {return geometry();}
114 
115     virtual int depth() const = 0;
116     virtual QImage::Format format() const = 0;
117 
118     virtual QSizeF physicalSize() const;
119     virtual QDpi logicalDpi() const;
120     virtual QDpi logicalBaseDpi() const;
121     virtual qreal devicePixelRatio() const;
122     virtual qreal pixelDensity()  const;
123 
124     virtual qreal refreshRate() const;
125 
126     virtual Qt::ScreenOrientation nativeOrientation() const;
127     virtual Qt::ScreenOrientation orientation() const;
128     virtual void setOrientationUpdateMask(Qt::ScreenOrientations mask);
129 
130     virtual QWindow *topLevelAt(const QPoint &point) const;
131     QWindowList windows() const;
132 
133     virtual QList<QPlatformScreen *> virtualSiblings() const;
134     const QPlatformScreen *screenForPosition(const QPoint &point) const;
135 
136     QScreen *screen() const;
137 
138     //jl: should this function be in QPlatformIntegration
139     //jl: maybe screenForWindow is a better name?
140     static QPlatformScreen *platformScreenForWindow(const QWindow *window);
141 
name()142     virtual QString name() const { return QString(); }
143 
144     virtual QString manufacturer() const;
145     virtual QString model() const;
146     virtual QString serialNumber() const;
147 
148     virtual QPlatformCursor *cursor() const;
149     virtual SubpixelAntialiasingType subpixelAntialiasingTypeHint() const;
150 
151     virtual PowerState powerState() const;
152     virtual void setPowerState(PowerState state);
153 
154     virtual QVector<Mode> modes() const;
155 
156     virtual int currentMode() const;
157     virtual int preferredMode() const;
158 
159     static int angleBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b);
160     static QTransform transformBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b, const QRect &target);
161     static QRect mapBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b, const QRect &rect);
162 
163     // The platform screen's geometry in device independent coordinates
164     QRect deviceIndependentGeometry() const;
165 
166     static QDpi overrideDpi(const QDpi &in);
167 
168 protected:
169     void resizeMaximizedWindows();
170 
171     QScopedPointer<QPlatformScreenPrivate> d_ptr;
172 
173 private:
174     friend class QScreenPrivate;
175 };
176 
177 // Qt doesn't currently support running with no platform screen
178 // QPA plugins can use this class to create a fake screen
179 class Q_GUI_EXPORT QPlatformPlaceholderScreen : public QPlatformScreen {
180 public:
181     // virtualSibling can be passed in to make the placeholder a sibling with other screens during
182     // the transitioning phase when the real screen is about to be removed, or the first real screen
183     // is about to be added. This is useful because Qt will currently recreate (but now show!)
184     // windows when they are moved from one virtual desktop to another, so if the last monitor is
185     // unplugged, then plugged in again, windows will be hidden unless the placeholder belongs to
186     // the same virtual desktop as the other screens.
m_virtualSibling(virtualSibling)187     QPlatformPlaceholderScreen(bool virtualSibling = true) : m_virtualSibling(virtualSibling) {}
isPlaceholder()188     bool isPlaceholder() const override { return true; }
geometry()189     QRect geometry() const override { return QRect(); }
availableGeometry()190     QRect availableGeometry() const override { return QRect(); }
depth()191     int depth() const override { return 32; }
format()192     QImage::Format format() const override { return QImage::Format::Format_RGB32; }
193     QList<QPlatformScreen *> virtualSiblings() const override;
194 private:
195     bool m_virtualSibling = true;
196 };
197 
198 QT_END_NAMESPACE
199 
200 #endif // QPLATFORMSCREEN_H
201