qt-everywhere-src-5.14.1/qtbase/src/platformsupport/input/shared/qtouchoutputmapping.cpp

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#include "qtouchoutputmapping_p.h"
#include <QFile>
#include <QVariantMap>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonArray>

QT_BEGIN_NAMESPACE

bool QTouchOutputMapping::load()
{
    static QByteArray configFile = qgetenv("QT_QPA_EGLFS_KMS_CONFIG");
    if (configFile.isEmpty())
        return false;

    QFile file(QString::fromUtf8(configFile));
    if (!file.open(QFile::ReadOnly)) {
        qWarning("touch input support: Failed to open %s", configFile.constData());
        return false;
    }

    const QJsonDocument doc = QJsonDocument::fromJson(file.readAll());
    if (!doc.isObject()) {
        qWarning("touch input support: Failed to parse %s", configFile.constData());
        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(QLatin1String("outputs")).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;
        }
        const QString &deviceNode = output.value(QStringLiteral("touchDevice")).toString();
        const QString &screenName = output.value(QStringLiteral("name")).toString();
        m_screenTable.insert(deviceNode, screenName);
    }

    return true;
}

QString QTouchOutputMapping::screenNameForDeviceNode(const QString &deviceNode)
{
    return m_screenTable.value(deviceNode);
}

QT_END_NAMESPACE