QPrinter&QPainter. Size scaling

[Jetstream]

I want render information from QTableWidget to pdf file using QPrinter + QPainter, but i have a problem with size scaling when trying do that, they little more than in qtablewidget (~10%). How i can solve this problem? I guess that problem in scale coefficients for QPainter. Thanks for answers.

TableWidget

TableWidget and Pdf comparison

Source code for converting:

QPrinter printer(QPrinter::HighResolution);
printer.setOutputFileName("");
printer.setPageSize(QPrinter::A4);
printer.setFullPage(true);

QPainter painter(&printer);

const auto logicalDeviceDpiX = printer.logicalDpiX();
const auto logicalDeviceDpiY = printer.logicalDpiY();

auto screen = QApplication::screens().at(0);
const auto logicalScreenDpiX = screen->logicalDotsPerInchX();
const auto logicalScreenDpiY = screen->logicalDotsPerInchY();

const auto scaleWidth = logicalDeviceDpiX / logicalScreenDpiX;
const auto scaleHeight = logicalDeviceDpiY / logicalScreenDpiY;

painter.scale(scaleWidth, scaleHeight);


qDebug() << "Logical: ";
qDebug() << "Printer dpix: " << printer.logicalDpiX();
qDebug() << "Printer dpiy: " << printer.logicalDpiY();

qDebug() << "Physical";
qDebug() << "Printer dpix: " << printer.physicalDpiX();
qDebug() << "Printer dpiy: " << printer.physicalDpiY();

qDebug() << "Logical: ";
qDebug() << "Table widget dpix: " << tableWidget->logicalDpiX();
qDebug() << "Table widget dpiy: " << tableWidget->logicalDpiY();

qDebug() << "Physical";
qDebug() << "Table widget dpix: " << tableWidget->physicalDpiX();
qDebug() << "Table widget dpiy: " << tableWidget->physicalDpiY();

auto rowOffset = 0.0f;
auto columnOffset = 0.0f;

QPen pen(Qt::black);
pen.setWidth(0);
painter.setPen(pen);


for (auto rowIndex = 0; rowIndex < rowCount; ++rowIndex) {

    auto rowHeight = tableWidget->rowHeight(rowIndex);
    columnOffset = 0.0f;

    for (auto columnIndex = 0; columnIndex < columnCount; ++columnIndex) {
        auto columnWidth = tableWidget->columnWidth(columnIndex);

        QRectF cellRect(columnOffset, rowOffset, columnWidth, rowHeight);
        painter.drawRect(cellRect);

        QFont font("Times", 12);
        QFontMetrics metrics(font);
        font.setPixelSize(metrics.height());
        painter.setFont(font);

        painter.drawText(cellRect, tableWidget->item(rowIndex, columnIndex)->text(), Qt::AlignHCenter | Qt::AlignVCenter);
        columnOffset += columnWidth;
    }
    rowOffset += rowHeight;
}