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QPainter painter(&m_canvasImage);
painter.setRenderHints(QPainter::TextAntialiasing | QPainter::SmoothPixmapTransform);
painter.setCompositionMode(QPainter::CompositionMode_DestinationOver);//图片叠加模式
painter.setBrush(Qt::NoBrush);
painter.setFont(item->font());
painter.setPen(QPen(QColor(Qt::red)));
QRect textRect(rect);
painter.drawText(textRect,"这是测试的文字");
QPainter painter(&m_canvasImage);
painter.setRenderHints(QPainter::TextAntialiasing | QPainter::SmoothPixmapTransform);
painter.setBrush(Qt::NoBrush);
painter.setFont(item->font());
painter.setPen(QPen(QColor(Qt::red)));
QRect textRect(rect);
painter.drawText(textRect,"这是测试的文字");