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Round advances if subpixel position not supported

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Due to kerning and other OpenType features, it's possible
that the advances from the shaping process are fractional, but
this gives uneven glyph positioning for font engines that don't
support subpixel positioning (since the glyph will not match the
expected position, some gaps will look too large and some
too small). To match how e.g. GDI renders this, we round the
advances before setting the glyph positions for engines that
do not support subpixel positions.

[ChangeLog][Windows] Fixed uneven kerning for some fonts.

Task-number: QTBUG-48546
Change-Id: Ic00dc402abf7149aab6bf9b05b42827b805c1a15
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
This commit is contained in:
Eskil Abrahamsen Blomfeldt 2015-11-19 18:10:20 +01:00
parent a2ef3479b8
commit bf0af8b5a2
1 changed files with 5 additions and 5 deletions
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10
src/gui/text/qtextengine.cpp
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@ -1277,14 +1277,14 @@ int QTextEngine::shapeTextWithHarfbuzzNG(const QScriptItem &si, const ushort *st
for (uint i = 0; i < num_glyphs; ++i)
g.advances[i] *= stretch;
}
if (actualFontEngine->fontDef.styleStrategy & QFont::ForceIntegerMetrics) {
for (uint i = 0; i < num_glyphs; ++i)
g.advances[i] = g.advances[i].round();
}
}
#endif
if (!actualFontEngine->supportsSubPixelPositions() || (actualFontEngine->fontDef.styleStrategy & QFont::ForceIntegerMetrics)) {
for (uint i = 0; i < num_glyphs; ++i)
g.advances[i] = g.advances[i].round();
}
glyphs_shaped += num_glyphs;
}