QString QGeoTileCache::tileSpecToFilename(const QGeoTileSpec &spec, const QString &format, const QString &directory)
{
QString filename = spec.plugin();
filename += QLatin1String("-");
filename += QString::number(spec.mapId());
filename += QLatin1String("-");
filename += QString::number(spec.zoom());
filename += QLatin1String("-");
filename += QString::number(spec.x());
filename += QLatin1String("-");
filename += QString::number(spec.y());
//Append version if real version number to ensure backwards compatibility and eviction of old tiles
if (spec.version() != -1) {
filename += QLatin1String("-");
filename += QString::number(spec.version());
}
filename += QLatin1String(".");
filename += format;
QDir dir = QDir(directory);
return dir.filePath(filename);
}
unsigned int qHash(const QGeoTileSpec &spec)
{
unsigned int result = (qHash(spec.plugin()) * 13) % 31;
result += ((spec.mapId() * 17) % 31) << 5;
result += ((spec.zoom() * 19) % 31) << 10;
result += ((spec.x() * 23) % 31) << 15;
result += ((spec.y() * 29) % 31) << 20;
result += (spec.version() % 3) << 25;
return result;
}
QDebug operator<< (QDebug dbg, const QGeoTileSpec &spec)
{
dbg << spec.plugin() << spec.mapId() << spec.zoom() << spec.x() << spec.y() << spec.version();
return dbg;
}