153 lines
5.7 KiB
C++
153 lines
5.7 KiB
C++
// Copyright (C) 2023 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
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#include "svgpathloader.h"
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#include <QFile>
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#include <QPainterPath>
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#include <QXmlStreamReader>
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#include <QXmlStreamAttributes>
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#include <QStack>
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#include <QLocale>
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#include <QMatrix4x4>
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SvgPathLoader::SvgPathLoader()
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{
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connect(this, &SvgPathLoader::sourceChanged, this, &SvgPathLoader::loadPaths);
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loadPaths();
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}
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struct SvgState
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{
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QString fillColor = {};
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QString strokeColor = {};
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QString strokeWidth = {};
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QMatrix4x4 transform;
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};
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void SvgPathLoader::loadPaths()
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{
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m_paths.clear();
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m_fillColors.clear();
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m_strokeColors.clear();
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m_strokeWidths.clear();
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m_transforms.clear();
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if (m_source.isEmpty())
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return;
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QStack<SvgState> states;
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states.push({});
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QString fileName;
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if (m_source.isLocalFile())
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fileName = m_source.toLocalFile();
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else if (m_source.scheme() == QStringLiteral("qrc"))
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fileName = QStringLiteral(":/") + m_source.fileName();
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QFile f(fileName);
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if (f.open(QIODevice::ReadOnly)) {
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QXmlStreamReader reader(&f);
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SvgState currentState = {};
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while (!reader.atEnd()) {
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reader.readNext();
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QXmlStreamAttributes attrs = reader.attributes();
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if (reader.isStartElement())
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states.push(currentState);
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if (attrs.hasAttribute(QStringLiteral("transform"))) {
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QString t = attrs.value(QStringLiteral("transform")).toString();
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const bool isTranslate = t.startsWith(QStringLiteral("translate"));
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const bool isScale = t.startsWith(QStringLiteral("scale"));
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const bool isMatrix = t.startsWith(QStringLiteral("matrix"));
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if (isTranslate || isScale || isMatrix) {
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int pStart = t.indexOf(QLatin1Char('('));
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int pEnd = t.indexOf(QLatin1Char(')'));
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if (pStart >= 0 && pEnd > pStart + 1) {
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t = t.mid(pStart + 1, pEnd - pStart - 1);
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QStringList coords = t.split(QLatin1Char(','));
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if (isMatrix && coords.size() == 6) {
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QMatrix3x3 m;
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m(0, 0) = coords.at(0).toDouble();
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m(1, 0) = coords.at(1).toDouble();
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m(2, 0) = 0.0f;
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m(0, 1) = coords.at(2).toDouble();
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m(1, 1) = coords.at(3).toDouble();
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m(2, 1) = 0.0f;
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m(0, 2) = coords.at(4).toDouble();
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m(1, 2) = coords.at(5).toDouble();
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m(2, 2) = 1.0f;
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currentState.transform *= QMatrix4x4(m);
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} else if (coords.size() == 2) {
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qreal c1 = coords.first().toDouble();
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qreal c2 = coords.last().toDouble();
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if (isTranslate)
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currentState.transform.translate(c1, c2);
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else if (isScale)
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currentState.transform.scale(c1, c2);
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}
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}
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}
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}
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if (attrs.hasAttribute(QStringLiteral("fill"))) {
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currentState.fillColor = attrs.value(QStringLiteral("fill")).toString();
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if (!currentState.fillColor.startsWith("#"))
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currentState.fillColor = "";
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} else if (attrs.hasAttribute(QStringLiteral("style"))) {
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QString s = attrs.value(QStringLiteral("style")).toString();
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int idx = s.indexOf(QStringLiteral("fill:"));
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if (idx >= 0) {
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idx = s.indexOf(QLatin1Char('#'), idx);
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if (idx >= 0)
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currentState.fillColor = s.mid(idx, 7);
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}
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}
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if (currentState.fillColor == QStringLiteral("none"))
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currentState.fillColor = {};
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if (attrs.hasAttribute(QStringLiteral("stroke"))) {
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currentState.strokeColor = attrs.value(QStringLiteral("stroke")).toString();
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if (currentState.strokeColor == QStringLiteral("none"))
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currentState.strokeColor = {};
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}
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if (attrs.hasAttribute(QStringLiteral("stroke-width")))
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currentState.strokeWidth = attrs.value(QStringLiteral("stroke-width")).toString();
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if (reader.isStartElement() && reader.name() == QStringLiteral("path")) {
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m_fillColors.append(currentState.fillColor);
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m_strokeColors.append(currentState.strokeColor);
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m_strokeWidths.append(currentState.strokeWidth);
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QString t;
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for (int i = 0; i < 4; ++i) {
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if (i > 0)
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t += QLatin1Char(',');
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QVector4D row = currentState.transform.row(i);
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QLocale c(QLocale::C);
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t += QStringLiteral("%1, %2, %3, %4")
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.arg(c.toString(row.x()))
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.arg(c.toString(row.y()))
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.arg(c.toString(row.z()))
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.arg(c.toString(row.w()));
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}
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m_transforms.append(t);
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if (attrs.hasAttribute(QStringLiteral("d"))) {
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m_paths.append(attrs.value(QStringLiteral("d")).toString());
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}
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}
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if (reader.isEndElement()) {
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currentState = states.pop();
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}
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}
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} else {
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qWarning() << "Can't open file" << fileName;
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}
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emit pathsChanged();
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}
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