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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
60QT_BEGIN_NAMESPACE
61
62class QPaintDevice;
63
64class Q_GUI_EXPORT QPaintEnginePrivate
65{
66 Q_DECLARE_PUBLIC(QPaintEngine)
67public:
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
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(dx: qRound(d: systemTransform.dx()), dy: qRound(d: systemTransform.dy()));
92 else
93 systemClip = systemTransform.map(r: 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
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
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
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
135 virtual void systemStateChanged() { }
136
137 void drawBoxTextItem(const QPointF &p, const QTextItemInt &ti);
138
139 static QPaintEnginePrivate *get(QPaintEngine *paintEngine) { return paintEngine->d_func(); }
140
141 virtual QPaintEngine *aggregateEngine() { return nullptr; }
142 virtual Qt::HANDLE nativeHandle() { return nullptr; }
143};
144
145QT_END_NAMESPACE
146
147#endif // QPAINTENGINE_P_H
148

source code of qtbase/src/gui/painting/qpaintengine_p.h