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39 
40 #ifndef QPAINTENGINE_P_H
41 #define QPAINTENGINE_P_H
42 
43 //
44 //  W A R N I N G
45 //  -------------
46 //
47 // This file is not part of the Qt API.  It exists for the convenience
48 // of other Qt classes.  This header file may change from version to
49 // version without notice, or even be removed.
50 //
51 // We mean it.
52 //
53 
54 #include <QtGui/private/qtguiglobal_p.h>
55 #include "QtGui/qpainter.h"
56 #include "QtGui/qpaintengine.h"
57 #include "QtGui/qregion.h"
58 #include "private/qobject_p.h"
59 
60 QT_BEGIN_NAMESPACE
61 
62 class QPaintDevice;
63 
64 class Q_GUI_EXPORT QPaintEnginePrivate
65 {
Q_DECLARE_PUBLIC(QPaintEngine)66     Q_DECLARE_PUBLIC(QPaintEngine)
67 public:
68     QPaintEnginePrivate() : pdev(nullptr), q_ptr(nullptr), currentClipDevice(nullptr), hasSystemTransform(0),
69                             hasSystemViewport(0) {}
70     virtual ~QPaintEnginePrivate();
71 
72     QPaintDevice *pdev;
73     QPaintEngine *q_ptr;
74     QRegion baseSystemClip;
75     QRegion systemClip;
76     QRect systemRect;
77     QRegion systemViewport;
78     QTransform systemTransform;
79     QPaintDevice *currentClipDevice;
80     uint hasSystemTransform : 1;
81     uint hasSystemViewport : 1;
82 
updateSystemClip()83     inline void updateSystemClip()
84     {
85         systemClip = baseSystemClip;
86         if (systemClip.isEmpty())
87             return;
88 
89         if (hasSystemTransform) {
90             if (systemTransform.type() <= QTransform::TxTranslate)
91                 systemClip.translate(qRound(systemTransform.dx()), qRound(systemTransform.dy()));
92             else
93                 systemClip = systemTransform.map(systemClip);
94         }
95 
96         // Make sure we're inside the viewport.
97         if (hasSystemViewport) {
98             systemClip &= systemViewport;
99             if (systemClip.isEmpty()) {
100                 // We don't want to paint without system clip, so set it to 1 pixel :)
101                 systemClip = QRect(systemViewport.boundingRect().topLeft(), QSize(1, 1));
102             }
103         }
104     }
105 
setSystemTransform(const QTransform & xform)106     inline void setSystemTransform(const QTransform &xform)
107     {
108         systemTransform = xform;
109         hasSystemTransform = !xform.isIdentity();
110         updateSystemClip();
111         if (q_ptr->state)
112             systemStateChanged();
113     }
114 
setSystemViewport(const QRegion & region)115     inline void setSystemViewport(const QRegion &region)
116     {
117         systemViewport = region;
118         hasSystemViewport = !systemViewport.isEmpty();
119         updateSystemClip();
120         if (q_ptr->state)
121             systemStateChanged();
122     }
123 
setSystemTransformAndViewport(const QTransform & xform,const QRegion & region)124     inline void setSystemTransformAndViewport(const QTransform &xform, const QRegion &region)
125     {
126         systemTransform = xform;
127         hasSystemTransform = !xform.isIdentity();
128         systemViewport = region;
129         hasSystemViewport = !systemViewport.isEmpty();
130         updateSystemClip();
131         if (q_ptr->state)
132             systemStateChanged();
133     }
134 
systemStateChanged()135     virtual void systemStateChanged() { }
136 
137     void drawBoxTextItem(const QPointF &p, const QTextItemInt &ti);
138 
get(QPaintEngine * paintEngine)139     static QPaintEnginePrivate *get(QPaintEngine *paintEngine) { return paintEngine->d_func(); }
140 
aggregateEngine()141     virtual QPaintEngine *aggregateEngine() { return nullptr; }
nativeHandle()142     virtual Qt::HANDLE nativeHandle() { return nullptr; }
143 };
144 
145 QT_END_NAMESPACE
146 
147 #endif // QPAINTENGINE_P_H
148