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Painting fix when devicePixelRatio > 1

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Qt draws lines on half-pixel boundaries. Because of
rounding, this is not visible with non-scaled aliased
painting. However, on a high-DPI screen with scaling
enabled, the line under the menu bar is drawn at a one
pixel offset, which causes it to overlap the menubar items.

This change draws the line at the mathematically correct position.

Task-number: QTBUG-38858
Change-Id: I0a2260507d346b52a36258d479cde87064d991ef
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>
This commit is contained in:
Paul Olav Tvete
2014-08-22 15:13:28 +02:00
parent 9f2d54c959
commit ea82bfb532
1 changed files with 2 additions and 1 deletions
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3
src/plugins/coreplugin/manhattanstyle.cpp
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@@ -778,7 +778,8 @@ void ManhattanStyle::drawControl(ControlElement element, const QStyleOption *opt
Utils::StyleHelper::menuGradient(painter, option->rect, option->rect); Utils::StyleHelper::menuGradient(painter, option->rect, option->rect);
painter->save(); painter->save();
painter->setPen(Utils::StyleHelper::borderColor()); painter->setPen(Utils::StyleHelper::borderColor());
painter->drawLine(option->rect.bottomLeft(), option->rect.bottomRight()); painter->drawLine(option->rect.bottomLeft() + QPointF(0.5, 0.5),
option->rect.bottomRight() + QPointF(0.5, 0.5));
painter->restore(); painter->restore();
} }
break; break;