Fix tst_qquicktext::hAlignImplicitWidth() on high DPI displays

The test assumed that the grabbed image of the window was the same
size as what was specified in QML, but QQuickWindow::grabWindow()
returns an image that is scaled by the screen's devicePixelRatio.

Change-Id: I5b361edb28bec562c7f528d06892277dcbe5769f
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 4 insertions, 2 deletions

diff --git a/tests/auto/quick/qquicktext/tst_qquicktext.cpp b/tests/auto/quick/qquicktext/tst_qquicktext.cpp
index 2df70d89ff..46ec099501 100644
--- a/tests/auto/quick/qquicktext/tst_qquicktext.cpp
+++ b/tests/auto/quick/qquicktext/tst_qquicktext.cpp
@@ -913,8 +913,10 @@ void tst_qquicktext::hAlignImplicitWidth()
 
     // Try to check whether alignment works by checking the number of black
     // pixels in the thirds of the grabbed image.
-    const int windowWidth = 220;
-    const int textWidth = qCeil(text->implicitWidth());
+    // QQuickWindow::grabWindow() scales the returned image by the devicePixelRatio of the screen.
+    const qreal devicePixelRatio = view.screen()->devicePixelRatio();
+    const int windowWidth = 220 * devicePixelRatio;
+    const int textWidth = qCeil(text->implicitWidth()) * devicePixelRatio;
     QVERIFY2(textWidth < windowWidth, "System font too large.");
     const int sectionWidth = textWidth / 3;
     const int centeredSection1 = (windowWidth - textWidth) / 2;