1 | // Copyright (C) 2023 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 "qsgcurveglyphatlas_p.h" |
5 | #include "qsgcurvefillnode_p.h" |
6 | #include "qsgcurvestrokenode_p.h" |
7 | #include "qsgcurveprocessor_p.h" |
8 | #include "util/qquadpath_p.h" |
9 | |
10 | #include <QtGui/qrawfont.h> |
11 | #include <QtGui/qpainterpath.h> |
12 | |
13 | QT_BEGIN_NAMESPACE |
14 | |
15 | QSGCurveGlyphAtlas::QSGCurveGlyphAtlas(const QRawFont &font) |
16 | : m_font(font) |
17 | { |
18 | // The font size used for the curve atlas currently affects the outlines, since we don't |
19 | // really support cosmetic outlines. Therefore we need to pick one which gives large enough |
20 | // triangles relative to glyph size that we can reuse the same triangles for any font size. |
21 | // 64 is used as a "base font size" by the distance field renderer and other places in Qt |
22 | // because this also has the benefit it's big enough that hinting will be disabled. |
23 | static int curveGlyphAtlasFontSize = qEnvironmentVariableIntValue(varName: "QSGCURVEGLYPHATLAS_FONT_SIZE" ); |
24 | m_font.setPixelSize(curveGlyphAtlasFontSize > 0 ? qreal(curveGlyphAtlasFontSize) : 64.0); |
25 | } |
26 | |
27 | QSGCurveGlyphAtlas::~QSGCurveGlyphAtlas() |
28 | { |
29 | } |
30 | |
31 | void QSGCurveGlyphAtlas::populate(const QList<glyph_t> &glyphs) |
32 | { |
33 | for (glyph_t glyphIndex : glyphs) { |
34 | if (!m_glyphs.contains(key: glyphIndex)) { |
35 | QPainterPath path = m_font.pathForGlyph(glyphIndex); |
36 | QQuadPath quadPath = QQuadPath::fromPainterPath(path); |
37 | quadPath.setFillRule(Qt::WindingFill); |
38 | |
39 | Glyph glyph; |
40 | |
41 | QSGCurveProcessor::processStroke(strokePath: quadPath, miterLimit: 2, penWidth: 2, joinStyle: Qt::MiterJoin, capStyle: Qt::FlatCap, |
42 | addTriangle: [&glyph](const std::array<QVector2D, 3> &s, |
43 | const std::array<QVector2D, 3> &p, |
44 | const std::array<QVector2D, 3> &n, |
45 | bool isLine) { |
46 | glyph.strokeVertices.append(t: s.at(n: 0)); |
47 | glyph.strokeVertices.append(t: s.at(n: 1)); |
48 | glyph.strokeVertices.append(t: s.at(n: 2)); |
49 | |
50 | glyph.strokeUvs.append(t: p.at(n: 0)); |
51 | glyph.strokeUvs.append(t: p.at(n: 1)); |
52 | glyph.strokeUvs.append(t: p.at(n: 2)); |
53 | |
54 | glyph.strokeNormals.append(t: n.at(n: 0)); |
55 | glyph.strokeNormals.append(t: n.at(n: 1)); |
56 | glyph.strokeNormals.append(t: n.at(n: 2)); |
57 | |
58 | glyph.strokeElementIsLine.append(t: isLine); |
59 | }); |
60 | |
61 | quadPath = quadPath.subPathsClosed(); |
62 | quadPath.addCurvatureData(); // ### Since the inside of glyphs is defined by order of |
63 | // vertices, this step could be simplified |
64 | QSGCurveProcessor::solveOverlaps(path&: quadPath); |
65 | |
66 | QSGCurveProcessor::processFill(path: quadPath, |
67 | fillRule: Qt::WindingFill, |
68 | addTriangle: [&glyph](const std::array<QVector2D, 3> &v, |
69 | const std::array<QVector2D, 3> &n, |
70 | QSGCurveProcessor::uvForPointCallback uvForPoint) |
71 | { |
72 | glyph.vertices.append(t: v.at(n: 0)); |
73 | glyph.vertices.append(t: v.at(n: 1)); |
74 | glyph.vertices.append(t: v.at(n: 2)); |
75 | |
76 | QVector3D uv1 = uvForPoint(v.at(n: 0)); |
77 | glyph.uvs.append(t: uv1); |
78 | glyph.uvs.append(t: uvForPoint(v.at(n: 1))); |
79 | glyph.uvs.append(t: uvForPoint(v.at(n: 2))); |
80 | |
81 | glyph.normals.append(t: n.at(n: 0)); |
82 | glyph.normals.append(t: n.at(n: 1)); |
83 | glyph.normals.append(t: n.at(n: 2)); |
84 | |
85 | glyph.duvdx.append(t: QVector2D(uvForPoint(v.at(n: 0) + QVector2D(1, 0))) - QVector2D(uv1)); |
86 | glyph.duvdy.append(t: QVector2D(uvForPoint(v.at(n: 0) + QVector2D(0, 1))) - QVector2D(uv1)); |
87 | }); |
88 | |
89 | m_glyphs.insert(key: glyphIndex, value: glyph); |
90 | } |
91 | } |
92 | } |
93 | |
94 | void QSGCurveGlyphAtlas::addStroke(QSGCurveStrokeNode *node, |
95 | glyph_t glyphIndex, |
96 | const QPointF &position) const |
97 | { |
98 | const Glyph &glyph = m_glyphs[glyphIndex]; |
99 | |
100 | const QVector2D v(position); |
101 | for (qsizetype i = glyph.strokeElementIsLine.size() - 1; i >= 0; --i) { |
102 | QVector2D v1 = glyph.strokeVertices.at(i: i * 3 + 0) + v; |
103 | QVector2D v2 = glyph.strokeVertices.at(i: i * 3 + 1) + v; |
104 | QVector2D v3 = glyph.strokeVertices.at(i: i * 3 + 2) + v; |
105 | if (glyph.strokeElementIsLine.at(i)) { |
106 | node->appendTriangle(v: { v1, v2, v3 }, |
107 | p: std::array<QVector2D, 2>({ glyph.strokeUvs.at(i: i * 3 + 0) + v, glyph.strokeUvs.at(i: i * 3 + 2) + v }), |
108 | n: { glyph.strokeNormals.at(i: i * 3 + 0), glyph.strokeNormals.at(i: i * 3 + 1), glyph.strokeNormals.at(i: i * 3 + 2) }); |
109 | } else { |
110 | node->appendTriangle(v: { v1, v2, v3 }, |
111 | p: { glyph.strokeUvs.at(i: i * 3 + 0) + v, glyph.strokeUvs.at(i: i * 3 + 1) + v, glyph.strokeUvs.at(i: i * 3 + 2) + v }, |
112 | n: { glyph.strokeNormals.at(i: i * 3 + 0), glyph.strokeNormals.at(i: i * 3 + 1), glyph.strokeNormals.at(i: i * 3 + 2) }); |
113 | |
114 | } |
115 | } |
116 | } |
117 | |
118 | void QSGCurveGlyphAtlas::addGlyph(QSGCurveFillNode *node, |
119 | glyph_t glyphIndex, |
120 | const QPointF &position, |
121 | qreal pixelSize) const |
122 | { |
123 | const Glyph &glyph = m_glyphs[glyphIndex]; |
124 | |
125 | const float scaleFactor = pixelSize / m_font.pixelSize(); |
126 | const QVector2D v(position); |
127 | for (qsizetype i = 0; i < glyph.vertices.size() / 3; ++i) { |
128 | node->appendTriangle(v1: scaleFactor * glyph.vertices.at(i: i * 3 + 0) + v, |
129 | v2: scaleFactor * glyph.vertices.at(i: i * 3 + 1) + v, |
130 | v3: scaleFactor * glyph.vertices.at(i: i * 3 + 2) + v, |
131 | uv1: glyph.uvs.at(i: i * 3 + 0), |
132 | uv2: glyph.uvs.at(i: i * 3 + 1), |
133 | uv3: glyph.uvs.at(i: i * 3 + 2), |
134 | n1: glyph.normals.at(i: i * 3 + 0), |
135 | n2: glyph.normals.at(i: i * 3 + 1), |
136 | n3: glyph.normals.at(i: i * 3 + 2), |
137 | duvdx: glyph.duvdx.at(i) / scaleFactor, |
138 | duvdy: glyph.duvdy.at(i) / scaleFactor); |
139 | } |
140 | } |
141 | |
142 | QT_END_NAMESPACE |
143 | |