Add deviceIndependentSize() to QPixmap and QImage

This function returns the size in device independent
pixels, and should be used when calculating user
interface sizes.


Change-Id: I528123f962595a3da42438ca560289a29aca4917
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/auto/gui/image/qimage/tst_qimage.cpp b/tests/auto/gui/image/qimage/tst_qimage.cpp
index 1554ac3602..12345b2a97 100644
--- a/tests/auto/gui/image/qimage/tst_qimage.cpp
+++ b/tests/auto/gui/image/qimage/tst_qimage.cpp
@@ -212,6 +212,7 @@ private slots:
     void cleanupFunctions();
 
     void devicePixelRatio();
+    void deviceIndependentSize();
     void rgb30Unpremul();
     void rgb30Repremul_data();
     void rgb30Repremul();
@@ -3473,6 +3474,15 @@ void tst_QImage::devicePixelRatio()
     QCOMPARE(b.devicePixelRatio(), qreal(1.0));
 }
 
+void tst_QImage::deviceIndependentSize() {
+    QImage a(64, 64, QImage::Format_ARGB32);
+    a.fill(Qt::white);
+    a.setDevicePixelRatio(1.0);
+    QCOMPARE(a.deviceIndependentSize(), QSizeF(64, 64));
+    a.setDevicePixelRatio(2.0);
+    QCOMPARE(a.deviceIndependentSize(), QSizeF(32, 32));
+}
+
 void tst_QImage::rgb30Unpremul()
 {
     QImage a(3, 1, QImage::Format_A2RGB30_Premultiplied);