ArabicText in OpenGl (without QTranslator)

StefanK

Hello,
I have a question regarding using QRawFont to create a texture representing a defined arabic string. In my tests I define a utf8 string, create a QRawFont object and try to get the correct glyphs. Actually I get some arabic glyphs but they are not the expected one. Has anybody an idea with this sample code is not working correctly!?!?

QString StdWStringToQString(const std::wstring &str)
{
#ifdef _MSC_VER
    return QString::fromUtf16((const ushort *)str.c_str());
#else
    return QString::fromStdWString(str);
#endif
}

int main(int argc, char *argv[])
 {
 QApplication a(argc, argv);
 // set encoding for the project
 //QTextCodec::setCodecForCStrings(QTextCodec::codecForName("utf-8"));
 //QTextCodec::setCodecForTr(QTextCodec::codecForName("utf-8"));
 //QTextCodec::setCodecForLocale(QTextCodec::codecForName("utf-8"));
 
 QGlyphRun glyphs;
 QVector<quint32> glyphIndexes;
 QVector<QPointF> positions;
 
 //  this string I want to have as glyphs
 const std::wstring sample = L"رأس المستشعر لا يدعم ";
 QString arabic = StdWStringToQString(sample);
 
 QRawFont rawFont;
 rawFont.loadFromFile("c:\\Windows\\Fonts\\ARIAL.ttf", 72, QFont::PreferFullHinting);
 
 glyphIndexes = rawFont.glyphIndexesForString(arabic);

 for (int i = 0; i < glyphIndexes.count(); i++)
  positions.append(QPointF(10+i*30, 10));

 glyphs.setRawFont(rawFont);
 glyphs.setGlyphIndexes(glyphIndexes);
 glyphs.setPositions(positions);

 QImage drawGlyphs(400, 200, QImage::Format_ARGB32);
 drawGlyphs.fill(Qt::white);

 QPainter p(&drawGlyphs);
 p.setPen(Qt::black);
 p.drawGlyphRun(QPointF(10, 10), glyphs);

 QGraphicsScene *pScene = new QGraphicsScene(0, 0, 400, 200);
 QGraphicsView *pView = new QGraphicsView(pScene);

 pScene->addPixmap(QPixmap::fromImage(drawGlyphs));
 pView->show();

 return a.exec();
 }

For testing I put the arabic string as the QtWindow title and it was shown correctly - so I guess I have everything on my system to display these signs. Actually I have no idea whats wrong - my understanding of the arabic language is not very good. Maybe its an encoding problem, maybe its a layout problem, maybe its a problem with my system settings or maybe its a bug in my qt version!? Anybody an idea!?

Environment: Window7, VS2010, SystemLanguage = En, Sources encoded in utf-8, QTVersion 4.8.3

StefanK

Can anybody PLEASE compile and start these code on another computer - actually that would be helpfull too.