improve ImageView quality

qad/application/aboutwindow.ui

@@ -28,6 +28,9 @@
        </color>
       </brush>
      </property>
+     <property name="renderHints">
+      <set>QPainter::SmoothPixmapTransform|QPainter::TextAntialiasing</set>
+     </property>
     </widget>
    </item>
    <item>

qad/widgets/image_view.cpp

@@ -14,6 +14,8 @@ ImageView::ImageView(QWidget * parent): QGraphicsView(parent) {
 	setDragMode(QGraphicsView::NoDrag);
 	setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
 	setScene(new QGraphicsScene());
+	setRenderHint(QPainter::Antialiasing, true);
+	setRenderHint(QPainter::SmoothPixmapTransform, true);
 	item.setTransformationMode(Qt::SmoothTransformation);
 	item.setFlags(0);
 	scene()->addItem(&item);
@@ -28,12 +30,12 @@ ImageView::~ImageView() {
 
 
 QPixmap ImageView::pixmap() const {
-	return item.pixmap();
+	return map;
 }
 
 
 void ImageView::setPixmap(QPixmap pixmap) {
-	item.setPixmap(pixmap);
+	map = pixmap;
 	adjustView();
 }
 
@@ -42,12 +44,13 @@ void ImageView::setImage(const QImage & i) {
 	im_data.clear();
 	if (i.isNull()) {
 		item.setPixmap(QPixmap());
+		map = QPixmap();
 		return;
 	}
 	QBuffer b(&im_data); b.open(QIODevice::ReadWrite);
 	i.save(&b, "png");
 	b.close();
-	item.setPixmap(QPixmap::fromImage(i));
+	map = QPixmap::fromImage(i);
 	adjustView();
 }
 
@@ -56,17 +59,18 @@ void ImageView::setImage(const QByteArray & i) {
 	im_data = i;
 	if (i.isEmpty()) {
 		item.setPixmap(QPixmap());
+		map = QPixmap();
 		return;
 	}
-	item.setPixmap(QPixmap::fromImage(QImage::fromData(i)));
+	map = QPixmap::fromImage(QImage::fromData(i));
 	adjustView();
-
 }
 
 
 void ImageView::clear() {
 	im_data.clear();
 	item.setPixmap(QPixmap());
+	map = QPixmap();
 }
 
 
@@ -121,10 +125,17 @@ bool ImageView::eventFilter(QObject * o, QEvent * e) {
 
 
 void ImageView::adjustView() {
+	qreal mp = map.width() / map.size().boundedTo(size()).width();
+	if (mp > 2) {
+		item.setPixmap(map.scaled(map.size()/mp, Qt::KeepAspectRatio, Qt::SmoothTransformation));
+	} else {
+		item.setPixmap(map);
+	}
 	if (!autofit_) return;
 	setSceneRect(item.boundingRect());
 	fitInView(&item, Qt::KeepAspectRatio);
 	centerOn(&item);
+
 }
 
 

qad/widgets/image_view.h

@@ -52,6 +52,7 @@ private:
 	QByteArray im_data;
 	QPoint prev_pos;
 	bool autofit_;
+	QPixmap map;
 
 
 public slots: