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Fix partial pixel coverage calculation

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We want right - left, but the numbers we have are (1 - left) and right,
so we need right - (1 - left) = right + left - 1.

Fixes: QTBUG-91957
Fixes: QTBUG-92485
Change-Id: I238cbbe1eebddff1ce56da38127899cdbd21db0e
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
(cherry picked from commit 004189b2d8e751021f26d9eb28948f753ea8208c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Allan Sandfeld Jensen 2021-04-14 12:59:20 +02:00 committed by Qt Cherry-pick Bot
parent 6869d2463a
commit 8eeae7ae07
1 changed files with 1 additions and 1 deletions
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2
src/gui/painting/qrasterizer.cpp
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@ -864,7 +864,7 @@ void QRasterizer::rasterizeLine(const QPointF &a, const QPointF &b, qreal width,
if (leftWidth == QScFixedFactor)
coverage[0] = rightWidth * 255;
else
coverage[0] = (leftWidth + rightWidth) * 255;
coverage[0] = (rightWidth + leftWidth - QScFixedFactor) * 255;
x[0] = iLeft;
len[0] = 1;
} else {