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