qoutputmapping.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qoutputmapping_p.h"
#include <QFile>
#include <QFileInfo>
#include <QVariantMap>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
static QOutputMapping *s_outputMapping = nullptr;
 
QOutputMapping *QOutputMapping::get()
{
    if (!s_outputMapping)
        s_outputMapping = new QDefaultOutputMapping;
 
    return s_outputMapping;
}
 
bool QOutputMapping::load()
{
   return false;
}
 
QString QOutputMapping::screenNameForDeviceNode(const QString &deviceNode)
{
    Q_UNUSED(deviceNode);
    return QString();
}
 
#ifdef Q_OS_WEBOS
QWindow *QOutputMapping::windowForDeviceNode(const QString &deviceNode)
{
    Q_UNUSED(deviceNode);
    return nullptr;
}
 
void QOutputMapping::set(QOutputMapping *mapping)
{
    if (s_outputMapping)
        delete s_outputMapping;
 
    s_outputMapping = mapping;
}
#endif // Q_OS_WEBOS
 
bool QDefaultOutputMapping::load()
{
    static QString configFile = qEnvironmentVariable("QT_QPA_EGLFS_KMS_CONFIG");
    if (configFile.isEmpty())
        return false;
 
    QFile file(configFile);
    if (!file.open(QFile::ReadOnly)) {
        qWarning("touch input support: Failed to open %ls", qUtf16Printable(configFile));
        return false;
    }
 
    const QJsonDocument doc = QJsonDocument::fromJson(file.readAll());
    if (!doc.isObject()) {
        qWarning("touch input support: Failed to parse %ls", qUtf16Printable(configFile));
        return false;
    }
 
    // What we are interested is the virtualIndex and touchDevice properties for
    // each element in the outputs array.
    const QJsonArray outputs = doc.object().value("outputs"_L1).toArray();
    for (int i = 0; i < outputs.size(); ++i) {
        const QVariantMap output = outputs.at(i).toObject().toVariantMap();
        if (!output.contains(QStringLiteral("touchDevice")))
            continue;
        if (!output.contains(QStringLiteral("name"))) {
            qWarning("evdevtouch: Output %d specifies touchDevice but not name, this is wrong", i);
            continue;
        }
        QFileInfo deviceNode(output.value(QStringLiteral("touchDevice")).toString());
        const QString &screenName = output.value(QStringLiteral("name")).toString();
        // Key on the canonical path so that a symlinked node, e.g. one under
        // /dev/input/by-id, matches the node the input handler was given.
        QString key = deviceNode.canonicalFilePath();
        if (key.isEmpty()) {
            qWarning("touch input support: Cannot resolve touchDevice %ls of output %ls",
                     qUtf16Printable(deviceNode.filePath()), qUtf16Printable(screenName));
            key = deviceNode.filePath();
        }
        m_screenTable.insert(key, screenName);
    }
 
    return true;
}
 
QString QDefaultOutputMapping::screenNameForDeviceNode(const QString &deviceNode)
{
    const QString canonical = QFileInfo(deviceNode).canonicalFilePath();
    if (!canonical.isEmpty()) {
        auto it = m_screenTable.constFind(canonical);
        if (it != m_screenTable.constEnd())
            return *it;
    }
    return m_screenTable.value(deviceNode);
}
 
QT_END_NAMESPACE