[vtkusers] vtkTextActor render utf8 characters not working

[Frank Sea]

Hi All,

I built the test code at the following location: 
https://gitlab.kitware.com/vtk/vtk/blob/master/Rendering/FreeType/Testing/Cxx/TestMathTextFreeTypeTextRenderer.cxx#L184

which tests displaying utf8 chars like following:
    // UTF-8 freetype handling:
    vtkNew<vtkTextActor> actor15;
    actor15->GetTextProperty()->SetFontFamily(VTK_FONT_FILE);
    actor15->GetTextProperty()->SetFontFile(uncodeFontFile.c_str());
    actor15->GetTextProperty()->SetJustificationToCentered();
    actor15->GetTextProperty()->SetVerticalJustificationToCentered();
    actor15->GetTextProperty()->SetFontSize(18);
    actor15->GetTextProperty()->SetColor(0.0, 1.0, 0.7);
    actor15->SetInput("UTF-8 FreeType:
\xce\xa8\xd2\x94\xd2\x96\xd1\x84\xd2\xbe");
    actor15->SetPosition(10, 110);

I provided font file from
https://github.com/aosp-mirror/platform_frameworks_base/blob/master/data/fonts/DroidSansFallbackFull.ttf

But the text is not rendered. It's blank for that one. Anyone know the
reason? I am on Windows 10.



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