diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gui/text/windows/qwindowsfontenginedirectwrite.cpp | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/src/gui/text/windows/qwindowsfontenginedirectwrite.cpp b/src/gui/text/windows/qwindowsfontenginedirectwrite.cpp index 55aab15132..5d4139f585 100644 --- a/src/gui/text/windows/qwindowsfontenginedirectwrite.cpp +++ b/src/gui/text/windows/qwindowsfontenginedirectwrite.cpp @@ -194,10 +194,16 @@ static DWRITE_MEASURING_MODE renderModeToMeasureMode(DWRITE_RENDERING_MODE rende } } -static DWRITE_RENDERING_MODE hintingPreferenceToRenderingMode(QFont::HintingPreference hintingPreference) +static DWRITE_RENDERING_MODE hintingPreferenceToRenderingMode(const QFontDef &fontDef) { - if (QHighDpiScaling::isActive() && hintingPreference == QFont::PreferDefaultHinting) - hintingPreference = QFont::PreferVerticalHinting; + QFont::HintingPreference hintingPreference = QFont::HintingPreference(fontDef.hintingPreference); + if (QHighDpiScaling::isActive() && hintingPreference == QFont::PreferDefaultHinting) { + // Microsoft documentation recommends using asymmetric rendering for small fonts + // at pixel size 16 and less, and symmetric for larger fonts. + hintingPreference = fontDef.pixelSize > 16.0 + ? QFont::PreferNoHinting + : QFont::PreferVerticalHinting; + } switch (hintingPreference) { case QFont::PreferNoHinting: @@ -507,7 +513,7 @@ void QWindowsFontEngineDirectWrite::recalcAdvances(QGlyphLayout *glyphs, QFontEn QVarLengthArray<DWRITE_GLYPH_METRICS> glyphMetrics(glyphIndices.size()); HRESULT hr; - DWRITE_RENDERING_MODE renderMode = hintingPreferenceToRenderingMode(QFont::HintingPreference(fontDef.hintingPreference)); + DWRITE_RENDERING_MODE renderMode = hintingPreferenceToRenderingMode(fontDef); if (renderMode == DWRITE_RENDERING_MODE_GDI_CLASSIC || renderMode == DWRITE_RENDERING_MODE_GDI_NATURAL) { hr = m_directWriteFontFace->GetGdiCompatibleGlyphMetrics(float(fontDef.pixelSize), 1.0f, @@ -686,8 +692,7 @@ QImage QWindowsFontEngineDirectWrite::imageForGlyph(glyph_t t, transform.m21 = xform.m21(); transform.m22 = xform.m22(); - DWRITE_RENDERING_MODE renderMode = - hintingPreferenceToRenderingMode(QFont::HintingPreference(fontDef.hintingPreference)); + DWRITE_RENDERING_MODE renderMode = hintingPreferenceToRenderingMode(fontDef); DWRITE_MEASURING_MODE measureMode = renderModeToMeasureMode(renderMode); @@ -993,8 +998,7 @@ glyph_metrics_t QWindowsFontEngineDirectWrite::alphaMapBoundingBox(glyph_t glyph transform.m21 = matrix.m21(); transform.m22 = matrix.m22(); - DWRITE_RENDERING_MODE renderMode = - hintingPreferenceToRenderingMode(QFont::HintingPreference(fontDef.hintingPreference)); + DWRITE_RENDERING_MODE renderMode = hintingPreferenceToRenderingMode(fontDef); DWRITE_MEASURING_MODE measureMode = renderModeToMeasureMode(renderMode); IDWriteGlyphRunAnalysis *glyphAnalysis = NULL; |