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CoreText: Fix fonts with synthetic stretch

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If a font is synthetically condensed / expanded, we need to scale
the advances as well as the bounding boxes for the glyph cache.
The logic is adapted from DirectWrite font engine, where the same
scaling is already in place.

[ChangeLog][macOS] Fixed a bug where synthetically stretched fonts
would get the wrong advances and sometimes glyphs would be clipped.

Fixes: QTBUG-103838
Change-Id: I09fc87b245d1f2de980c10ad9253b9a83571f714
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
(cherry picked from commit 992a318d391db397d6fec78532ce9e60af098e58)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Eskil Abrahamsen Blomfeldt 2022-06-13 12:35:37 +02:00 committed by Qt Cherry-pick Bot
parent 97d7042c45
commit 763fb35d9d
1 changed files with 7 additions and 2 deletions
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9
src/gui/text/coretext/qfontengine_coretext.mm
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@ -503,7 +503,11 @@ glyph_metrics_t QCoreTextFontEngine::alphaMapBoundingBox(glyph_t glyph, const QF
return QFontEngine::alphaMapBoundingBox(glyph, subPixelPosition, matrix, format);
glyph_metrics_t br = boundingBox(glyph);
qcoretextfontengine_scaleMetrics(br, matrix);
QTransform xform = matrix;
if (fontDef.stretch != 100 && fontDef.stretch != QFont::AnyStretch)
xform.scale(fontDef.stretch / 100.0, 1.0);
qcoretextfontengine_scaleMetrics(br, xform);
// Normalize width and height
if (br.width < 0)
@ -848,8 +852,9 @@ void QCoreTextFontEngine::loadAdvancesForGlyphs(QVarLengthArray<CGGlyph> &cgGlyp
QVarLengthArray<CGSize> advances(numGlyphs);
CTFontGetAdvancesForGlyphs(ctfont, kCTFontOrientationHorizontal, cgGlyphs.data(), advances.data(), numGlyphs);
qreal stretch = fontDef.stretch != QFont::AnyStretch ? fontDef.stretch / 100.0 : 1.0;
for (int i = 0; i < numGlyphs; ++i)
glyphs->advances[i] = QFixed::fromReal(advances[i].width);
glyphs->advances[i] = QFixed::fromReal(advances[i].width * stretch);
}
QFontEngine::FaceId QCoreTextFontEngine::faceId() const