[vtkusers] Problems Rendering UTF8 strings

[Oliver Kania]

Hello,
 the following test-application should print the greek letter "MU" (micro
sign)
but it does print an "A with a hat" plus a MU.
The same happens with other UTF8 encoded letters.

===================================================================
int main()
{
    VTK_CREATE(vtkRenderer,ren1);
    ren1->SetBackground( 0.2, 0.3, 0.5 );

    VTK_CREATE(vtkRenderWindow,renWin);
    renWin->AddRenderer( ren1 );
    renWin->SetSize( 300, 300 );
    vtkUnicodeString
l_vtkUnicodeStr(vtkUnicodeString::from_utf8("\xc2\xb5"));


    VTK_CREATE(CStringItem,l_item);
    vtkStdString
l_str(l_vtkUnicodeStr.utf8_str(),l_vtkUnicodeStr.byte_count());
    l_item->SetLabel(l_str);
    VTK_CREATE(vtkContextActor,l_actor);
    l_actor->GetScene()->AddItem(l_item);


vtkOpenGLContextDevice2D::SafeDownCast(l_actor->GetContext()->GetDevice())
        ->SetStringRendererToQt();
    ren1->AddActor(l_actor);

    VTK_CREATE(vtkRenderWindowInteractor, interactor);
    interactor->SetRenderWindow(renWin);
    renWin->SetMultiSamples(0);
    renWin->Render();

    interactor->Start();

}

/// code for class CStringItem used above: (Header)

class CStringItem : public vtkContextItem
{
public:
    //TODO : add reset string, set position of label etc.
    virtual bool Paint(vtkContext2D *painter);
    //CStringItem(const vtkStdString& p_vtkStrDefault);
    static CStringItem *New();
    vtkTypeRevisionMacro(CStringItem, vtkContextItem);
    void SetLabel(const vtkStdString& p_vtkStrLabel);

private:

    vtkStdString m_vtkStr;
};

/// CPP file:

bool CStringItem::Paint( vtkContext2D *painter )
{
    painter->GetTextProp()->SetVerticalJustificationToCentered();
    painter->GetTextProp()->SetJustificationToCentered();
    painter->GetTextProp()->SetColor(1.0, 1.0, 1.0);
    painter->GetTextProp()->SetFontSize(13);
    painter->GetTextProp()->SetFontFamilyToCourier();
    painter->DrawString(100, 100, m_vtkStr);

    // TODO return sth meaningfull
    return true;
}

void CStringItem::SetLabel(const vtkStdString& p_vtkStrLabel )
{
    m_vtkStr = p_vtkStrLabel;
}

vtkStandardNewMacro(CStringItem);
vtkCxxRevisionMacro(CStringItem, "$Revision: 1.5 $");

=====================================================================

In the above code, i could simply pass "\xc2\xb5" to the SetLabel method and
the same happens.
Any help would be greatly appreciated.

Best Regards,
Oliver Kania
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