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blur: fix HiDPI awareness (#305)

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When copying from a QPixmap, the rectangle area should be scaled according to `devicePixelRatio`.

This fixes #300.
This commit is contained in:
Peter Cai
2018-08-11 17:44:32 +08:00
committed by Dharkael
parent c980df1589
commit ae9d18ce9e
1 changed files with 3 additions and 1 deletions
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4
src/tools/blur/blurtool.cpp
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@@ -52,13 +52,15 @@ void BlurTool::process(QPainter &painter, const QPixmap &pixmap, bool recordUndo
}
QPoint &p0 = m_points.first;
QPoint &p1 = m_points.second;
auto pixelRatio = pixmap.devicePixelRatio();
QRect selection = QRect(p0, p1).normalized();
QRect selectionScaled = QRect(p0 * pixelRatio, p1 * pixelRatio).normalized();
QGraphicsBlurEffect *blur = new QGraphicsBlurEffect;
blur->setBlurRadius(10);
QGraphicsPixmapItem *item = new QGraphicsPixmapItem (
pixmap.copy(selection));
pixmap.copy(selectionScaled));
item->setGraphicsEffect(blur);
QGraphicsScene scene;