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ImageViewer: No interpolation when zooming in

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The imageViewer currently always renders the images smooth/interpolated.
When loading an image in an IDE and zooming in, I usually do that in
order to examine the details on pixel level. Therefore, I believe that
smoothing/interpolation should be turned off with a scalefactor >= 1.

This patch does that for images and movies. Svg files remain always
smooth.

Change-Id: I327583b1f46132d179a1e0425f146106d962377b
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
This commit is contained in:
Alessandro Portale
2014-07-24 16:29:40 +02:00
parent 49707ff3f0
commit 3efa2cf964
1 changed files with 5 additions and 1 deletions
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6
src/plugins/imageviewer/imageview.cpp
View File

@@ -69,7 +69,8 @@ public:
void paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) void paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
{ {
painter->setRenderHint(QPainter::SmoothPixmapTransform, true); const bool smoothTransform = painter->worldTransform().m11() < 1;
painter->setRenderHint(QPainter::SmoothPixmapTransform, smoothTransform);
painter->drawPixmap(offset(), m_movie->currentPixmap()); painter->drawPixmap(offset(), m_movie->currentPixmap());
} }
@@ -257,6 +258,9 @@ void ImageView::doScale(qreal factor)
scale(actualFactor, actualFactor); scale(actualFactor, actualFactor);
emitScaleFactor(); emitScaleFactor();
if (QGraphicsPixmapItem *pixmapItem = dynamic_cast<QGraphicsPixmapItem *>(d->imageItem))
pixmapItem->setTransformationMode(
transform().m11() < 1 ? Qt::SmoothTransformation : Qt::FastTransformation);
} }
void ImageView::updatePixmap(const QRect &rect) void ImageView::updatePixmap(const QRect &rect)