IFACEMETHODIMP CustomTextRenderer::DrawGlyphRun(
_In_opt_ void* clientDrawingContext,
FLOAT baselineOriginX,
FLOAT baselineOriginY,
DWRITE_MEASURING_MODE measuringMode,
_In_ DWRITE_GLYPH_RUN const* glyphRun,
_In_ DWRITE_GLYPH_RUN_DESCRIPTION const* glyphRunDescription,
IUnknown* clientDrawingEffect
)
{
HRESULT hr = S_OK;
HRESULT hrColor = DWRITE_E_NOCOLOR;
DWRITE_MATRIX* worldToDeviceTransform = nullptr;
Microsoft::WRL::ComPtr<IDWriteColorGlyphRunEnumerator> colorLayers;
hrColor = m_dwriteFactory2->TranslateColorGlyphRun(
baselineOriginX,
baselineOriginY,
glyphRun,
nullptr,
measuringMode,
worldToDeviceTransform,
0,
&colorLayers
);
if (hrColor != DWRITE_E_NOCOLOR)
{
Microsoft::WRL::ComPtr<ID2D1SolidColorBrush> solidBrush;
for (;;){
BOOL haveRun;
DX::ThrowIfFailed(colorLayers->MoveNext(&haveRun));
if (!haveRun)
break;
DWRITE_COLOR_GLYPH_RUN const* colorRun;
DX::ThrowIfFailed(colorLayers->GetCurrentRun(&colorRun));
ID2D1Brush* layerBrush;
if (colorRun->paletteIndex == 0xFFFF)
{
layerBrush = m_outlineBrush.Get();
}
else
{
if (solidBrush == nullptr)
{
DX::ThrowIfFailed(m_d2dDeviceContext->CreateSolidColorBrush(&colorRun->runColor, nullptr, &solidBrush));
}
else
{
solidBrush->SetColor(colorRun->runColor);
}
layerBrush = solidBrush.Get();
}
m_d2dDeviceContext->DrawGlyphRun(
D2D1::Point2(colorRun->baselineOriginX,colorRun->baselineOriginY),
&colorRun->glyphRun,
colorRun->glyphRunDescription,
layerBrush,
measuringMode
);
}
}
if (hrColor == DWRITE_E_NOCOLOR)
{
// Usual case: the run does not have any colored glyphs.
m_d2dDeviceContext->DrawGlyphRun(
D2D1::Point2(baselineOriginX,baselineOriginY),
glyphRun,
m_outlineBrush.Get(),
measuringMode
);
}
return hr;
}
