Implement high-dpi "@2x" image handling.

Make QQuickBaseImage::load() load "@2x" image files
on high-dpi displays. Reload images on screen change
in order to load the correct version depending on
screen dpi. Modify QQuickImageBase::updatePaintNode()
to work with @2x images.

QQuickBaseImage::load() now looks at the target
window's devicePixelRatio and checks for the presence
of a "@2x" file on disk. If found the @2x version
will be used.

Unlike QPixmap, QQuickPixmap has no special knowledge
of "@2x" files. They pixmap system will be asked to
load "@2x" files and will cache them and report the
(device) pixel size, like any other pixmap.

Add auto-test and manual test.

Task-number: QTBUG-32862, QTBUG-33069
Change-Id: I1f57a10075e499f6eee61df5421e1986521c6ab0
Reviewed-by: Andy Nichols <andy.nichols@digia.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/quick/items/qquickimagebase_p.h b/src/quick/items/qquickimagebase_p.h
index 72258b4971..67f1e81cae 100644
--- a/src/quick/items/qquickimagebase_p.h
+++ b/src/quick/items/qquickimagebase_p.h
@@ -86,6 +86,8 @@ public:
     virtual void setMirror(bool mirror);
     bool mirror() const;
 
+    void resolve2xLocalFile(const QUrl &url, qreal targetDevicePixelRatio, QUrl *sourceUrl, qreal *sourceDevicePixelRatio);
+
 Q_SIGNALS:
     void sourceChanged(const QUrl &);
     void sourceSizeChanged();
@@ -104,6 +106,8 @@ protected:
 private Q_SLOTS:
     virtual void requestFinished();
     void requestProgress(qint64,qint64);
+    void handleWindowChanged(QQuickWindow *window);
+    void handleScreenChanged(QScreen *);
 
 private:
     Q_DISABLE_COPY(QQuickImageBase)