diff options
Diffstat (limited to 'dev-qt/qtdeclarative/files/qtdeclarative-5.14.2-fix-subpixel-positioned-text.patch')
| -rw-r--r-- | dev-qt/qtdeclarative/files/qtdeclarative-5.14.2-fix-subpixel-positioned-text.patch | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/dev-qt/qtdeclarative/files/qtdeclarative-5.14.2-fix-subpixel-positioned-text.patch b/dev-qt/qtdeclarative/files/qtdeclarative-5.14.2-fix-subpixel-positioned-text.patch new file mode 100644 index 000000000000..23eaa7d5100d --- /dev/null +++ b/dev-qt/qtdeclarative/files/qtdeclarative-5.14.2-fix-subpixel-positioned-text.patch @@ -0,0 +1,64 @@ +From e807f9d1d80559b8ff91f1c3cfdd755b3da56a6d Mon Sep 17 00:00:00 2001 +From: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io> +Date: Tue, 5 May 2020 11:36:24 +0200 +Subject: [PATCH] Fix subpixel positioned text with Text.NativeRendering + +We would be generating subpixel positioned glyphs based on the +relative positions of the glyphs, ignoring the fractional part +contributed by the origin of the text. So if the text origin was +inside a pixel, the subpixel antialiasing would be wrong and we +would see kerning errors. + +This was especially visible when using AlignHCenter on text +with hinting disabled and resizing the item it was aligning to. + +Pick-to: 5.15 +Task-number: QTBUG-49646 +Change-Id: I0e709ba2b5d2440e34c94c6f819befe0a65a113a +Reviewed-by: Lars Knoll <lars.knoll@qt.io> +Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com> +--- + src/quick/scenegraph/qsgdefaultglyphnode_p.cpp | 9 ++++----- + 1 file changed, 4 insertions(+), 5 deletions(-) + +diff --git a/src/quick/scenegraph/qsgdefaultglyphnode_p.cpp b/src/quick/scenegraph/qsgdefaultglyphnode_p.cpp +index cfa645bfd03..f73b64f537f 100644 +--- a/src/quick/scenegraph/qsgdefaultglyphnode_p.cpp ++++ b/src/quick/scenegraph/qsgdefaultglyphnode_p.cpp +@@ -789,11 +789,12 @@ void QSGTextMaskMaterial::populate(const QPointF &p, + const QMargins &margins) + { + Q_ASSERT(m_font.isValid()); ++ QPointF position(p.x(), p.y() - m_font.ascent()); + QVector<QFixedPoint> fixedPointPositions; + const int glyphPositionsSize = glyphPositions.size(); + fixedPointPositions.reserve(glyphPositionsSize); + for (int i=0; i < glyphPositionsSize; ++i) +- fixedPointPositions.append(QFixedPoint::fromPointF(glyphPositions.at(i))); ++ fixedPointPositions.append(QFixedPoint::fromPointF(position + glyphPositions.at(i))); + + QTextureGlyphCache *cache = glyphCache(); + +@@ -815,18 +816,16 @@ void QSGTextMaskMaterial::populate(const QPointF &p, + Q_ASSERT(geometry->sizeOfVertex() == sizeof(QVector4D)); + ushort *ip = geometry->indexDataAsUShort(); + +- QPointF position(p.x(), p.y() - m_font.ascent()); + bool supportsSubPixelPositions = fontD->fontEngine->supportsSubPixelPositions(); + for (int i=0; i<glyphIndexes.size(); ++i) { ++ QPointF glyphPosition = glyphPositions.at(i) + position; + QFixed subPixelPosition; + if (supportsSubPixelPositions) +- subPixelPosition = fontD->fontEngine->subPixelPositionForX(QFixed::fromReal(glyphPositions.at(i).x())); ++ subPixelPosition = fontD->fontEngine->subPixelPositionForX(QFixed::fromReal(glyphPosition.x())); + + QTextureGlyphCache::GlyphAndSubPixelPosition glyph(glyphIndexes.at(i), subPixelPosition); + const QTextureGlyphCache::Coord &c = cache->coords.value(glyph); + +- QPointF glyphPosition = glyphPositions.at(i) + position; +- + // On a retina screen the glyph positions are not pre-scaled (as opposed to + // eg. the raster paint engine). To ensure that we get the same behavior as + // the raster engine (and CoreText itself) when it comes to rounding of the +-- +2.16.3 |