summaryrefslogtreecommitdiffstats
path: root/src/gui/painting/qcosmeticstroker_p.h
blob: b22e2c2cf5ae4dad0dd5bfbc4f7ef46b3f87a1df (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QCOSMETICSTROKER_P_H
#define QCOSMETICSTROKER_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <private/qdrawhelper_p.h>
#include <private/qvectorpath_p.h>
#include <private/qpaintengine_raster_p.h>
#include <qpen.h>

QT_BEGIN_NAMESPACE


class QCosmeticStroker;


typedef bool (*StrokeLine)(QCosmeticStroker *stroker, qreal x1, qreal y1, qreal x2, qreal y2, int caps);

class QCosmeticStroker
{
public:
    struct Point {
        int x;
        int y;
    };
    struct PointF {
        qreal x;
        qreal y;
    };

    enum Caps {
        NoCaps = 0,
        CapBegin = 0x1,
        CapEnd = 0x2
    };

    // used to avoid drop outs or duplicated points
    enum Direction {
        TopToBottom = 0x1,
        BottomToTop = 0x2,
        LeftToRight = 0x4,
        RightToLeft = 0x8,
        VerticalMask = 0x3,
        HorizontalMask = 0xc
    };

    QCosmeticStroker(QRasterPaintEngineState *s, const QRect &dr, const QRect &dr_unclipped)
        : state(s),
          deviceRect(dr_unclipped),
          clip(dr),
          pattern(0),
          reversePattern(0),
          patternSize(0),
          patternLength(0),
          patternOffset(0),
          legacyRounding(false),
          current_span(0),
          lastDir(LeftToRight),
          lastAxisAligned(false)
    { setup(); }

    ~QCosmeticStroker() { free(pattern); free(reversePattern); }

    void setLegacyRoundingEnabled(bool legacyRoundingEnabled) { legacyRounding = legacyRoundingEnabled; }

    void drawLine(const QPointF &p1, const QPointF &p2);
    void drawPath(const QVectorPath &path);
    void drawPoints(const QPoint *points, int num);
    void drawPoints(const QPointF *points, int num);


    QRasterPaintEngineState *state;
    QRect deviceRect;
    QRect clip;
    // clip bounds in real
    qreal xmin, xmax;
    qreal ymin, ymax;

    StrokeLine stroke;
    bool drawCaps;

    int *pattern;
    int *reversePattern;
    int patternSize;
    int patternLength;
    int patternOffset;

    bool legacyRounding;

    enum { NSPANS = 255 };
    QT_FT_Span spans[NSPANS];
    int current_span;
    ProcessSpans blend;

    int opacity;

    uint color;
    uint *pixels;
    int ppl;

    Direction lastDir;
    Point lastPixel;
    bool lastAxisAligned;

private:
    void setup();

    void renderCubic(const QPointF &p1, const QPointF &p2, const QPointF &p3, const QPointF &p4, int caps);
    void renderCubicSubdivision(PointF *points, int level, int caps);
    // used for closed subpaths
    void calculateLastPoint(qreal rx1, qreal ry1, qreal rx2, qreal ry2);

public:
    bool clipLine(qreal &x1, qreal &y1, qreal &x2, qreal &y2);
};

QT_END_NAMESPACE

#endif // QCOSMETICLINE_H