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