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#include "qsvgfont_p.h"
5
6#include "qpainter.h"
7#include "qpen.h"
8#include "qdebug.h"
9#include "qpicture.h"
10
11QT_BEGIN_NAMESPACE
12
13QSvgGlyph::QSvgGlyph(QChar unicode, const QPainterPath &path, qreal horizAdvX)
14 : m_unicode(unicode), m_path(path), m_horizAdvX(horizAdvX)
15{
16
17}
18
19
20QSvgFont::QSvgFont(qreal horizAdvX)
21 : m_horizAdvX(horizAdvX)
22{
23}
24
25
26QString QSvgFont::familyName() const
27{
28 return m_familyName;
29}
30
31
32void QSvgFont::addGlyph(QChar unicode, const QPainterPath &path, qreal horizAdvX )
33{
34 m_glyphs.insert(key: unicode, value: QSvgGlyph(unicode, path,
35 (horizAdvX==-1)?m_horizAdvX:horizAdvX));
36}
37
38
39void QSvgFont::draw(QPainter *p, const QPointF &point, const QString &str,
40 qreal pixelSize, Qt::Alignment alignment) const
41{
42 draw_helper(p, point, str, pixelSize, alignment, boundingRect: nullptr);
43}
44
45QRectF QSvgFont::boundingRect(QPainter *p, const QPointF &point, const QString &str,
46 qreal pixelSize, Qt::Alignment alignment) const
47{
48 QRectF bounds;
49 draw_helper(p, point, str, pixelSize, alignment, boundingRect: &bounds);
50 return bounds;
51}
52
53void QSvgFont::draw_helper(QPainter *p, const QPointF &point, const QString &str, qreal pixelSize,
54 Qt::Alignment alignment, QRectF *boundingRect) const
55{
56 const bool isPainting = (boundingRect == nullptr);
57
58 p->save();
59 p->translate(offset: point);
60 p->scale(sx: pixelSize / m_unitsPerEm, sy: -pixelSize / m_unitsPerEm);
61
62 // Calculate the text width to be used for alignment
63 int textWidth = 0;
64 QString::const_iterator itr = str.constBegin();
65 for ( ; itr != str.constEnd(); ++itr) {
66 QChar unicode = *itr;
67 if (!m_glyphs.contains(key: *itr)) {
68 unicode = u'\0';
69 if (!m_glyphs.contains(key: unicode))
70 continue;
71 }
72 textWidth += static_cast<int>(m_glyphs[unicode].m_horizAdvX);
73 }
74
75 QPoint alignmentOffset(0, 0);
76 if (alignment == Qt::AlignHCenter) {
77 alignmentOffset.setX(-textWidth / 2);
78 } else if (alignment == Qt::AlignRight) {
79 alignmentOffset.setX(-textWidth);
80 }
81
82 p->translate(offset: alignmentOffset);
83
84 // since in SVG the embedded font ain't really a path
85 // the outline has got to stay untransformed...
86 qreal penWidth = p->pen().widthF();
87 penWidth /= (pixelSize/m_unitsPerEm);
88 QPen pen = p->pen();
89 pen.setWidthF(penWidth);
90 p->setPen(pen);
91
92 itr = str.constBegin();
93 for ( ; itr != str.constEnd(); ++itr) {
94 QChar unicode = *itr;
95 if (!m_glyphs.contains(key: *itr)) {
96 unicode = u'\0';
97 if (!m_glyphs.contains(key: unicode))
98 continue;
99 }
100
101 if (isPainting)
102 p->drawPath(path: m_glyphs[unicode].m_path);
103
104 if (boundingRect) {
105 QPainterPathStroker stroker;
106 stroker.setWidth(penWidth);
107 stroker.setJoinStyle(p->pen().joinStyle());
108 stroker.setMiterLimit(p->pen().miterLimit());
109 QPainterPath stroke = stroker.createStroke(path: m_glyphs[unicode].m_path);
110 *boundingRect |= p->transform().map(p: stroke).boundingRect();
111 }
112
113 p->translate(dx: m_glyphs[unicode].m_horizAdvX, dy: 0);
114 }
115
116 p->restore();
117}
118
119void QSvgFont::setFamilyName(const QString &name)
120{
121 m_familyName = name;
122}
123
124void QSvgFont::setUnitsPerEm(qreal upem)
125{
126 m_unitsPerEm = upem;
127}
128
129QT_END_NAMESPACE
130

source code of qtsvg/src/svg/qsvgfont.cpp