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Fix high-DPI scaling of window decorations for shared memory buffers

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Change-Id: I6833ab86ffdb4e37dad5108baddb7a54cfb5e9fa
Reviewed-by: Giulio Camuffo <giulio.camuffo@kdab.com>
This commit is contained in:
Johan Klokkhammer Helsing 2016-07-08 14:46:34 +02:00 committed by Johan Helsing
parent d4d47f2a04
commit f4c3ad57b7
1 changed files with 18 additions and 10 deletions
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28
src/plugins/platforms/wayland/qwaylandshmbackingstore.cpp
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@ -301,29 +301,37 @@ void QWaylandShmBackingStore::updateDecorations()
QPainter decorationPainter(entireSurface());
decorationPainter.setCompositionMode(QPainter::CompositionMode_Source);
QImage sourceImage = windowDecoration()->contentImage();
QRect target;
qreal dp = sourceImage.devicePixelRatio();
int dpWidth = int(sourceImage.width() / dp);
int dpHeight = int(sourceImage.height() / dp);
QMatrix sourceMatrix;
sourceMatrix.scale(dp, dp);
QRect target; // needs to be in device independent pixels
//Top
target.setX(0);
target.setY(0);
target.setWidth(sourceImage.width());
target.setWidth(dpWidth);
target.setHeight(windowDecorationMargins().top());
decorationPainter.drawImage(target, sourceImage, target);
decorationPainter.drawImage(target, sourceImage, sourceMatrix.mapRect(target));
//Left
target.setWidth(windowDecorationMargins().left());
target.setHeight(sourceImage.height());
decorationPainter.drawImage(target, sourceImage, target);
target.setHeight(dpHeight);
decorationPainter.drawImage(target, sourceImage, sourceMatrix.mapRect(target));
//Right
target.setX(sourceImage.width() - windowDecorationMargins().right());
decorationPainter.drawImage(target, sourceImage, target);
target.setX(dpWidth - windowDecorationMargins().right());
target.setWidth(windowDecorationMargins().right());
decorationPainter.drawImage(target, sourceImage, sourceMatrix.mapRect(target));
//Bottom
target.setX(0);
target.setY(sourceImage.height() - windowDecorationMargins().bottom());
target.setWidth(sourceImage.width());
target.setY(dpHeight - windowDecorationMargins().bottom());
target.setWidth(dpWidth);
target.setHeight(windowDecorationMargins().bottom());
decorationPainter.drawImage(target, sourceImage, target);
decorationPainter.drawImage(target, sourceImage, sourceMatrix.mapRect(target));
}
QWaylandAbstractDecoration *QWaylandShmBackingStore::windowDecoration() const