AuroraMiddleware/qt5base-lts
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Account for hinting preference in alpha map bounding box

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We would ignore the vertical hinting when calculating the
bounding box, giving an off-by-one error in the base line of
some characters when rendering with PreferVerticalHinting,
which is the default when doing High-DPI on Windows.

Task-number: QTBUG-50940
Change-Id: I2846765ec044eaf317026ee8c7bb9588257bf05c
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>
This commit is contained in:
Eskil Abrahamsen Blomfeldt 2016-02-09 15:51:28 +01:00 committed by Jani Heikkinen
parent f5b9cdbb08
commit 8c2b426600
1 changed files with 6 additions and 1 deletions
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7
src/plugins/platforms/windows/qwindowsfontenginedirectwrite.cpp
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@ -759,12 +759,17 @@ glyph_metrics_t QWindowsFontEngineDirectWrite::alphaMapBoundingBox(glyph_t glyph
transform.m21 = matrix.m21();
transform.m22 = matrix.m22();
DWRITE_RENDERING_MODE renderMode =
fontDef.hintingPreference == QFont::PreferNoHinting
? DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC
: DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL;
IDWriteGlyphRunAnalysis *glyphAnalysis = NULL;
HRESULT hr = m_fontEngineData->directWriteFactory->CreateGlyphRunAnalysis(
&glyphRun,
1.0f,
&transform,
DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC,
renderMode,
DWRITE_MEASURING_MODE_NATURAL,
0.0, 0.0,
&glyphAnalysis