You may not need to do quite so much work with IDWriteTextAnalysisSink / AnalyzeScript.
HRESULT hr = S_OK;
ComPtr<IDWriteTextFormat> textFormat;
ComPtr<IDWriteTextLayout> textLayout;
// Error checking omitted for brevity
hr = textFactory->CreateTextFormat(L"Arial", nullptr, DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STYLE_NORMAL, DWRITE_FONT_STRETCH_NORMAL, 30.0f, L"", textFormat.GetAddressOf());
hr = textFormat->SetReadingDirection(DWRITE_READING_DIRECTION_RIGHT_TO_LEFT);
hr = textFactory->CreateTextLayout(L"[HEBREW TEXT HERE]", textsize, textFormat.Get(), 0.0f, 0.0f, textLayout.GetAddressOf());
Render Code:
renderTarget->Clear(BG_COLOR);
auto size = renderTarget->GetSize();
auto margin = 50.0f;
size.width -= margin * 2.0f;
size.height -= margin * 2.0f;
if (S_OK == textLayout->SetMaxWidth(size.width) &&
S_OK == textLayout->SetMaxHeight(size.height))
{
renderTarget->DrawTextLayout(Point2F(margin, margin), textLayout.Get(), brush.Get(), D2D1_DRAW_TEXT_OPTIONS_NONE);
}
Screenshot from reading hebrew file:
(Note: My solution is based on a sample from Kenny Kerr) I realize you are mixing LTR and RTL, however I am not sure that warrants the added complexity of IDWriteTextAnalysisSink / AnalyzeScript.