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39
40#ifndef QPAINTENGINE_ALPHA_P_H
41#define QPAINTENGINE_ALPHA_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 <QtPrintSupport/private/qtprintsupportglobal_p.h>
55
56#ifndef QT_NO_PRINTER
57#include "private/qpaintengine_p.h"
58#include <QtPrintSupport/qtprintsupportglobal.h>
59
60QT_BEGIN_NAMESPACE
61
62class QAlphaPaintEnginePrivate;
63
64class Q_PRINTSUPPORT_EXPORT QAlphaPaintEngine : public QPaintEngine
65{
66 Q_DECLARE_PRIVATE(QAlphaPaintEngine)
67public:
68 ~QAlphaPaintEngine();
69
70 bool begin(QPaintDevice *pdev) override;
71 bool end() override;
72
73 void updateState(const QPaintEngineState &state) override;
74
75 void drawPath(const QPainterPath &path) override;
76
77 void drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode) override;
78
79 void drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr) override;
80 void drawTextItem(const QPointF &p, const QTextItem &textItem) override;
81 void drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &s) override;
82
83protected:
84 QAlphaPaintEngine(QAlphaPaintEnginePrivate &data, PaintEngineFeatures devcaps = { });
85 QRegion alphaClipping() const;
86 bool continueCall() const;
87 void flushAndInit(bool init = true);
88 void cleanUp();
89};
90
91class QAlphaPaintEnginePrivate : public QPaintEnginePrivate
92{
93 Q_DECLARE_PUBLIC(QAlphaPaintEngine)
94public:
95 QAlphaPaintEnginePrivate();
96 ~QAlphaPaintEnginePrivate();
97
98 int m_pass;
99 QPicture *m_pic;
100 QPaintEngine *m_picengine;
101 QPainter *m_picpainter;
102
103 QPaintEngine::PaintEngineFeatures m_savedcaps;
104 QPaintDevice *m_pdev;
105
106 QRegion m_alphargn;
107 QRegion m_cliprgn;
108 mutable QRegion m_cachedDirtyRgn;
109 mutable int m_numberOfCachedRects;
110 QVector<QRect> m_dirtyRects;
111
112 bool m_hasalpha;
113 bool m_alphaPen;
114 bool m_alphaBrush;
115 bool m_alphaOpacity;
116 bool m_advancedPen;
117 bool m_advancedBrush;
118 bool m_complexTransform;
119 bool m_emulateProjectiveTransforms;
120 bool m_continueCall;
121
122 QTransform m_transform;
123 QPen m_pen;
124
125 void addAlphaRect(const QRectF &rect);
126 void addDirtyRect(const QRectF &rect) { m_dirtyRects.append(t: rect.toAlignedRect()); }
127 bool canSeeTroughBackground(bool somethingInRectHasAlpha, const QRectF &rect) const;
128
129 QRectF addPenWidth(const QPainterPath &path);
130 void drawAlphaImage(const QRectF &rect);
131 QRect toRect(const QRectF &rect) const;
132 bool fullyContained(const QRectF &rect) const;
133
134 void resetState(QPainter *p);
135};
136
137QT_END_NAMESPACE
138
139#endif // QT_NO_PRINTER
140
141#endif // QPAINTENGINE_ALPHA_P_H
142

source code of qtbase/src/printsupport/kernel/qpaintengine_alpha_p.h