1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#ifndef QVECTORPATH_P_H
5#define QVECTORPATH_P_H
6
7//
8// W A R N I N G
9// -------------
10//
11// This file is not part of the Qt API. It exists purely as an
12// implementation detail. This header file may change from version to
13// version without notice, or even be removed.
14//
15// We mean it.
16//
17
18#include <QtGui/private/qtguiglobal_p.h>
19#include <QtGui/qpaintengine.h>
20
21#include <private/qpaintengine_p.h>
22#include <private/qstroker_p.h>
23#include <private/qpainter_p.h>
24
25
26QT_BEGIN_NAMESPACE
27
28
29class QPaintEngineEx;
30
31typedef void (*qvectorpath_cache_cleanup)(QPaintEngineEx *engine, void *data);
32
33struct QRealRect {
34 qreal x1, y1, x2, y2;
35};
36
37class Q_GUI_EXPORT QVectorPath
38{
39public:
40 enum Hint {
41 // Shape hints, in 0x000000ff, access using shape()
42 AreaShapeMask = 0x0001, // shape covers an area
43 NonConvexShapeMask = 0x0002, // shape is not convex
44 CurvedShapeMask = 0x0004, // shape contains curves...
45 LinesShapeMask = 0x0008,
46 RectangleShapeMask = 0x0010,
47 ShapeMask = 0x001f,
48
49 // Shape hints merged into basic shapes..
50 LinesHint = LinesShapeMask,
51 RectangleHint = AreaShapeMask | RectangleShapeMask,
52 EllipseHint = AreaShapeMask | CurvedShapeMask,
53 ConvexPolygonHint = AreaShapeMask,
54 PolygonHint = AreaShapeMask | NonConvexShapeMask,
55 RoundedRectHint = AreaShapeMask | CurvedShapeMask,
56 ArbitraryShapeHint = AreaShapeMask | NonConvexShapeMask | CurvedShapeMask,
57
58 // Other hints
59 IsCachedHint = 0x0100, // Set if the cache hint is set
60 ShouldUseCacheHint = 0x0200, // Set if the path should be cached when possible..
61 ControlPointRect = 0x0400, // Set if the control point rect has been calculated...
62
63 // Shape rendering specifiers...
64 OddEvenFill = 0x1000,
65 WindingFill = 0x2000,
66 ImplicitClose = 0x4000,
67 ExplicitOpen = 0x8000
68 };
69
70 // ### Falcon: introduca a struct XY for points so lars is not so confused...
71 QVectorPath(const qreal *points,
72 int count,
73 const QPainterPath::ElementType *elements = nullptr,
74 uint hints = ArbitraryShapeHint)
75 : m_elements(elements),
76 m_points(points),
77 m_count(count),
78 m_hints(hints)
79 {
80 }
81
82 ~QVectorPath();
83
84 QRectF controlPointRect() const;
85
86 inline Hint shape() const { return (Hint) (m_hints & ShapeMask); }
87 inline bool isConvex() const { return (m_hints & NonConvexShapeMask) == 0; }
88 inline bool isCurved() const { return m_hints & CurvedShapeMask; }
89
90 inline bool isCacheable() const { return m_hints & ShouldUseCacheHint; }
91 inline bool hasImplicitClose() const { return m_hints & ImplicitClose; }
92 inline bool hasExplicitOpen() const { return m_hints & ExplicitOpen; }
93 inline bool hasWindingFill() const { return m_hints & WindingFill; }
94
95 inline void makeCacheable() const { m_hints |= ShouldUseCacheHint; m_cache = nullptr; }
96 inline uint hints() const { return m_hints; }
97
98 inline const QPainterPath::ElementType *elements() const { return m_elements; }
99 inline const qreal *points() const { return m_points; }
100 inline bool isEmpty() const { return m_points == nullptr; }
101
102 inline int elementCount() const { return m_count; }
103 inline const QPainterPath convertToPainterPath() const;
104
105 static inline uint polygonFlags(QPaintEngine::PolygonDrawMode mode)
106 {
107 switch (mode) {
108 case QPaintEngine::ConvexMode: return ConvexPolygonHint | ImplicitClose;
109 case QPaintEngine::OddEvenMode: return PolygonHint | OddEvenFill | ImplicitClose;
110 case QPaintEngine::WindingMode: return PolygonHint | WindingFill | ImplicitClose;
111 case QPaintEngine::PolylineMode: return PolygonHint | ExplicitOpen;
112 default: return 0;
113 }
114 }
115
116 struct CacheEntry {
117 QPaintEngineEx *engine;
118 void *data;
119 qvectorpath_cache_cleanup cleanup;
120 CacheEntry *next;
121 };
122
123 CacheEntry *addCacheData(QPaintEngineEx *engine, void *data, qvectorpath_cache_cleanup cleanup) const;
124 inline CacheEntry *lookupCacheData(QPaintEngineEx *engine) const {
125 Q_ASSERT(m_hints & ShouldUseCacheHint);
126 CacheEntry *e = m_cache;
127 while (e) {
128 if (e->engine == engine)
129 return e;
130 e = e->next;
131 }
132 return nullptr;
133 }
134
135 template <typename T> static inline bool isRect(const T *pts, int elementCount) {
136 return (elementCount == 5 // 5-point polygon, check for closed rect
137 && pts[0] == pts[8] && pts[1] == pts[9] // last point == first point
138 && pts[0] == pts[6] && pts[2] == pts[4] // x values equal
139 && pts[1] == pts[3] && pts[5] == pts[7] // y values equal...
140 && pts[0] < pts[4] && pts[1] < pts[5]
141 ) ||
142 (elementCount == 4 // 4-point polygon, check for unclosed rect
143 && pts[0] == pts[6] && pts[2] == pts[4] // x values equal
144 && pts[1] == pts[3] && pts[5] == pts[7] // y values equal...
145 && pts[0] < pts[4] && pts[1] < pts[5]
146 );
147 }
148
149 inline bool isRect() const
150 {
151 const QPainterPath::ElementType * const types = elements();
152
153 return (shape() == QVectorPath::RectangleHint)
154 || (isRect(pts: points(), elementCount: elementCount())
155 && (!types || (types[0] == QPainterPath::MoveToElement
156 && types[1] == QPainterPath::LineToElement
157 && types[2] == QPainterPath::LineToElement
158 && types[3] == QPainterPath::LineToElement)));
159 }
160
161
162private:
163 Q_DISABLE_COPY_MOVE(QVectorPath)
164
165 const QPainterPath::ElementType *m_elements;
166 const qreal *m_points;
167 const int m_count;
168
169 mutable uint m_hints;
170 mutable QRealRect m_cp_rect;
171
172 mutable CacheEntry *m_cache;
173};
174
175Q_GUI_EXPORT const QVectorPath &qtVectorPathForPath(const QPainterPath &path);
176
177QT_END_NAMESPACE
178
179#endif
180

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