Draw Color Gｌyph with DirectWrite 1.2

colorglyph.cpp

void DrawGlyphRun(ID2D1RenderTarget* target, IDWriteFactory factory, IDWriteFont* fontFace, ID2D1Brush* defaultBrush, DWRITE_GLYPH_RUN* glyphRun)
{
  bool isColor = false;
  IDWriteColorGlyphRunEnumerator* colorLayer;

  IDWriteFont2* fontFace2;
  fontFace->QueryInterface(reinterpret_cast<IDWriteFontFace2**>(&fontFace2));
  if (fontFace2->IsColorFont()) {
    IDWriteFactory2* factory2;
    factory->QueryIntarface(reinterpret_cast<IDWriteFactory2**>(&factory2));
    if (SUCCEEDED(factory2->TranslateColorGlyphRun(0, 0, glyphRun, nullptr, DWRITE_MEASURING_MODE_NATURAL, nullptr, 0, &colorLayer))) {
      isColor = true;
    }
  }
  
  if (isColor) {
    BOOL hasRun;
    const DWRITE_COLOR_GLYPH_RUN* colorRun;

    while (true) {
      if (FAILED(colorLayer->MoveNext(&hasRun)) || !hasRun) {
        break;
      }
      if (FAILED(colorLayer->GetCurrentRun(&colorRun))) {
        break;
      }
      
      ID2DBrush* brush = nullptr;
      if (colorRun->runColor.r == 0.0 && colorRun->runColor.g == 0.0 && colorRun->runColor.b == 0.0 && ColorRun->runColor.a == 0.0) {
        target->CreateSolidColorBrush(colorRun->runColor, &brush);
      }
      
      target->DrawGlyphRun(point, glyphRun, brush ? brush : defaultBrush);
      
      if (brush) {
        brush->Release();
      }
    }
  } else {
    target->DrawGlyphRun(point, glyphRun, defaultBrush);
  }
}