Why painter->setPen() doesn't work with QTextDocument?

[jiveaxe]

If I have this code:

...
QPainter *painter = new QPainter(this);
painter->setPen(Qt::white);
QAbstractTextDocumentLayout::PaintContext context;
QTextDocument doc;
doc.setTextWidth(220);
doc.setHtml(text);
doc.documentLayout()->draw(painter, context);

...
QPainter *painter = new QPainter(this);
painter->setPen(Qt::white);
QAbstractTextDocumentLayout::PaintContext context;
QTextDocument doc;
doc.setTextWidth(220);
doc.setHtml(text);
doc.documentLayout()->draw(painter, context);

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the text is drawn in black instead of white? Only if i write:

doc.setHtml("<font color=\"white\">" + text + "</font>");

doc.setHtml("<font color=\"white\">" + text + "</font>");

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it works.

Regards