QQmlDataBlob: Take and return qreal for progress

QQmlDataBlob so far took and returned a quint8 for progress – however
the sole consumer of it expected a qreal in the [0;1] range.

progress returning an integer dates back all the way to
22a7d19d68bab2882fd9a6ebefd65152bbc1eaf5; the reason why this did not
create issues in practice is that the code path is only exercised when
downloading QML files over the network, which turned out to be a rather
uncommon use case.

Change-Id: I0140729955e393a19000adabe55f40fdd2caa04d
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/qml/qml/qqmldatablob_p.h b/src/qml/qml/qqmldatablob_p.h
index 522d02e97a..b54f71c79e 100644
--- a/src/qml/qml/qqmldatablob_p.h
+++ b/src/qml/qml/qqmldatablob_p.h
@@ -181,13 +181,14 @@ private:
             }
         }
 
-        inline quint8 progress() const
+        inline qreal progress() const
         {
-            return quint8((_p.loadRelaxed() & ProgressMask) >> ProgressShift);
+            return quint8((_p.loadRelaxed() & ProgressMask) >> ProgressShift) / float(0xFF);
         }
 
-        inline void setProgress(quint8 v)
+        inline void setProgress(qreal progress)
         {
+            quint8 v = 0xFF * progress;
             while (true) {
                 int d = _p.loadRelaxed();
                 int nd = (d & ~ProgressMask) | ((v << ProgressShift) & ProgressMask);