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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 
60 QT_BEGIN_NAMESPACE
61 
62 class QAlphaPaintEnginePrivate;
63 
64 class Q_PRINTSUPPORT_EXPORT QAlphaPaintEngine : public QPaintEngine
65 {
66     Q_DECLARE_PRIVATE(QAlphaPaintEngine)
67 public:
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 
83 protected:
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 
91 class QAlphaPaintEnginePrivate : public QPaintEnginePrivate
92 {
93     Q_DECLARE_PUBLIC(QAlphaPaintEngine)
94 public:
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);
addDirtyRect(const QRectF & rect)126     void addDirtyRect(const QRectF &rect) { m_dirtyRects.append(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 
137 QT_END_NAMESPACE
138 
139 #endif // QT_NO_PRINTER
140 
141 #endif // QPAINTENGINE_ALPHA_P_H
142