Converting from double to qreal in gui

There were a number of places in QtGui where doubles were used in
expressions due to the use of floating point constants in the
code. Many of these constants are now constructed as qreal, removing
the use of double operations where unneeded.

These changes have been limited to constants that have exactly the same
value whether double or float, to ensure that precision errors are not
introduced.

This should not affect any of the desktop platforms where qreal is
double. On Symbian, where qreal is float, appropriate autotests have
been run.

Task-number: QTBUG-4894
Reviewed-by: Sami Merila

21 files changed, 66 insertions, 66 deletions

diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index 9092593918..cb7349ca97 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -8868,7 +8868,7 @@ QPainterPath QGraphicsEllipseItem::shape() const
         return path;
     if (d->spanAngle != 360 * 16) {
         path.moveTo(d->rect.center());
-        path.arcTo(d->rect, d->startAngle / 16.0, d->spanAngle / 16.0);
+        path.arcTo(d->rect, d->startAngle / qreal(16.0), d->spanAngle / qreal(16.0));
     } else {
         path.addEllipse(d->rect);
     }
diff --git a/src/gui/graphicsview/qgraphicsscene.cpp b/src/gui/graphicsview/qgraphicsscene.cpp
index 867880c621..d652f25e49 100644
--- a/src/gui/graphicsview/qgraphicsscene.cpp
+++ b/src/gui/graphicsview/qgraphicsscene.cpp
@@ -4304,7 +4304,7 @@ static void _q_paintItem(QGraphicsItem *item, QPainter *painter,
     QGraphicsWidget *widgetItem = static_cast<QGraphicsWidget *>(item);
     QGraphicsProxyWidget *proxy = qobject_cast<QGraphicsProxyWidget *>(widgetItem);
     const qreal windowOpacity = (proxy && proxy->widget() && useWindowOpacity)
-                                ? proxy->widget()->windowOpacity() : 1.0;
+                                ? proxy->widget()->windowOpacity() : qreal(1.0);
     const qreal oldPainterOpacity = painter->opacity();
 
     if (qFuzzyIsNull(windowOpacity))
diff --git a/src/gui/graphicsview/qgraphicsview.cpp b/src/gui/graphicsview/qgraphicsview.cpp
index 548f79fa17..d2e21fba89 100644
--- a/src/gui/graphicsview/qgraphicsview.cpp
+++ b/src/gui/graphicsview/qgraphicsview.cpp
@@ -298,7 +298,7 @@ inline int q_round_bound(qreal d) //### (int)(qreal) INT_MAX != INT_MAX for sing
         return INT_MIN;
     else if (d >= (qreal) INT_MAX)
         return INT_MAX;
-    return d >= 0.0 ? int(d + 0.5) : int(d - int(d-1) + 0.5) + int(d-1);
+    return d >= 0.0 ? int(d + qreal(0.5)) : int(d - int(d-1) + qreal(0.5)) + int(d-1);
 }
 
 void QGraphicsViewPrivate::translateTouchEvent(QGraphicsViewPrivate *d, QTouchEvent *touchEvent)
@@ -1830,14 +1830,14 @@ void QGraphicsView::centerOn(const QPointF &pos)
             qint64 horizontal = 0;
             horizontal += horizontalScrollBar()->minimum();
             horizontal += horizontalScrollBar()->maximum();
-            horizontal -= int(viewPoint.x() - width / 2.0);
+            horizontal -= int(viewPoint.x() - width / qreal(2.0));
             horizontalScrollBar()->setValue(horizontal);
         } else {
-            horizontalScrollBar()->setValue(int(viewPoint.x() - width / 2.0));
+            horizontalScrollBar()->setValue(int(viewPoint.x() - width / qreal(2.0)));
         }
     }
     if (!d->topIndent)
-        verticalScrollBar()->setValue(int(viewPoint.y() - height / 2.0));
+        verticalScrollBar()->setValue(int(viewPoint.y() - height / qreal(2.0)));
     d->lastCenterPoint = oldCenterPoint;
 }
 
@@ -1886,22 +1886,22 @@ void QGraphicsView::ensureVisible(const QRectF &rect, int xmargin, int ymargin)
     if (viewRect.left() <= left + xmargin) {
         // need to scroll from the left
         if (!d->leftIndent)
-            horizontalScrollBar()->setValue(int(viewRect.left() - xmargin - 0.5));
+            horizontalScrollBar()->setValue(int(viewRect.left() - xmargin - qreal(0.5)));
     }
     if (viewRect.right() >= right - xmargin) {
         // need to scroll from the right
         if (!d->leftIndent)
-            horizontalScrollBar()->setValue(int(viewRect.right() - width + xmargin + 0.5));
+            horizontalScrollBar()->setValue(int(viewRect.right() - width + xmargin + qreal(0.5)));
     }
     if (viewRect.top() <= top + ymargin) {
         // need to scroll from the top
         if (!d->topIndent)
-            verticalScrollBar()->setValue(int(viewRect.top() - ymargin - 0.5));
+            verticalScrollBar()->setValue(int(viewRect.top() - ymargin - qreal(0.5)));
     }
     if (viewRect.bottom() >= bottom - ymargin) {
         // need to scroll from the bottom
         if (!d->topIndent)
-            verticalScrollBar()->setValue(int(viewRect.bottom() - height + ymargin + 0.5));
+            verticalScrollBar()->setValue(int(viewRect.bottom() - height + ymargin + qreal(0.5)));
     }
 }
 
diff --git a/src/gui/graphicsview/qgraphicswidget_p.cpp b/src/gui/graphicsview/qgraphicswidget_p.cpp
index ca6713bf24..ec79a2fd30 100644
--- a/src/gui/graphicsview/qgraphicswidget_p.cpp
+++ b/src/gui/graphicsview/qgraphicswidget_p.cpp
@@ -482,8 +482,8 @@ static QSizeF closestAcceptableSize(const QSizeF &proposed,
             minw = maxw;
             minh = maxh;
         }
-        middlew = minw + (maxw - minw)/2.0;
-        middleh = minh + (maxh - minh)/2.0;
+        middlew = minw + (maxw - minw)/qreal(2.0);
+        middleh = minh + (maxh - minh)/qreal(2.0);
 
         min_hfw = minimumHeightForWidth(middlew, minh, maxh, widget);
 
diff --git a/src/gui/graphicsview/qgridlayoutengine.cpp b/src/gui/graphicsview/qgridlayoutengine.cpp
index 66b4a5b6b4..5c614357d8 100644
--- a/src/gui/graphicsview/qgridlayoutengine.cpp
+++ b/src/gui/graphicsview/qgridlayoutengine.cpp
@@ -84,7 +84,7 @@ static qreal fixedDescent(qreal descent, qreal ascent, qreal targetSize)
     Q_ASSERT(targetSize >= ascent + descent);
 
     qreal extra = targetSize - (ascent + descent);
-    return descent + (extra / 2.0);
+    return descent + (extra / qreal(2.0));
 }
 
 static qreal compare(const QGridLayoutBox &box1, const QGridLayoutBox &box2, int which)
@@ -292,9 +292,9 @@ void QGridLayoutRowData::calculateGeometries(int start, int end, qreal targetSiz
                     int stretch = stretches[start + i];
                     if (sumStretches == 0) {
                         if (hasIgnoreFlag) {
-                            factors[i] = (stretch < 0) ? 1.0 : 0.0;
+                            factors[i] = (stretch < 0) ? qreal(1.0) : qreal(0.0);
                         } else {
-                            factors[i] = (stretch < 0) ? sizes[i] : 0.0;
+                            factors[i] = (stretch < 0) ? sizes[i] : qreal(0.0);
                         }
                     } else if (stretch == sumStretches) {
                         factors[i] = 1.0;
@@ -373,7 +373,7 @@ void QGridLayoutRowData::calculateGeometries(int start, int end, qreal targetSiz
 
             for (int i = 0; i < n; ++i) {
                 if (newSizes[i] < 0.0) {
-                    qreal delta = (sumFactors == 0.0) ? 0.0
+                    qreal delta = (sumFactors == 0.0) ? qreal(0.0)
                                                       : sumCurrentAvailable * factors[i] / sumFactors;
                     newSizes[i] = sizes[i] + delta;
                 }
diff --git a/src/gui/graphicsview/qsimplex_p.cpp b/src/gui/graphicsview/qsimplex_p.cpp
index eb8bcb8c1f..1b45d9d9f5 100644
--- a/src/gui/graphicsview/qsimplex_p.cpp
+++ b/src/gui/graphicsview/qsimplex_p.cpp
@@ -486,7 +486,7 @@ bool QSimplex::iterate()
     // Normalize Pivot Row
     qreal pivot = valueAt(pivotRow, pivotColumn);
     if (pivot != 1.0)
-        combineRows(pivotRow, pivotRow, (1.0 - pivot) / pivot);
+        combineRows(pivotRow, pivotRow, (qreal(1.0) - pivot) / pivot);
 
     // Update other rows
     for (int row=0; row < rows; ++row) {
diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp
index a3378de443..f527bcf5cb 100644
--- a/src/gui/image/qimage.cpp
+++ b/src/gui/image/qimage.cpp
@@ -5908,12 +5908,12 @@ bool qt_xForm_helper(const QTransform &trueMat, int xoffset, int type, int depth
                      uchar *dptr, int dbpl, int p_inc, int dHeight,
                      const uchar *sptr, int sbpl, int sWidth, int sHeight)
 {
-    int m11 = int(trueMat.m11()*4096.0);
-    int m12 = int(trueMat.m12()*4096.0);
-    int m21 = int(trueMat.m21()*4096.0);
-    int m22 = int(trueMat.m22()*4096.0);
-    int dx  = qRound(trueMat.dx()*4096.0);
-    int dy  = qRound(trueMat.dy()*4096.0);
+    int m11 = int(trueMat.m11()*qreal(4096.0));
+    int m12 = int(trueMat.m12()*qreal(4096.0));
+    int m21 = int(trueMat.m21()*qreal(4096.0));
+    int m22 = int(trueMat.m22()*qreal(4096.0));
+    int dx  = qRound(trueMat.dx()*qreal(4096.0));
+    int dy  = qRound(trueMat.dy()*qreal(4096.0));
 
     int m21ydx = dx + (xoffset<<16) + (m11 + m21) / 2;
     int m22ydy = dy + (m12 + m22) / 2;
diff --git a/src/gui/kernel/qtooltip.cpp b/src/gui/kernel/qtooltip.cpp
index f880243a7e..178e7b1a46 100644
--- a/src/gui/kernel/qtooltip.cpp
+++ b/src/gui/kernel/qtooltip.cpp
@@ -184,7 +184,7 @@ QTipLabel::QTipLabel(const QString &text, QWidget *w)
     setAlignment(Qt::AlignLeft);
     setIndent(1);
     qApp->installEventFilter(this);
-    setWindowOpacity(style()->styleHint(QStyle::SH_ToolTipLabel_Opacity, 0, this) / 255.0);
+    setWindowOpacity(style()->styleHint(QStyle::SH_ToolTipLabel_Opacity, 0, this) / qreal(255.0));
     setMouseTracking(true);
     fadingOut = false;
     reuseTip(text);
diff --git a/src/gui/kernel/qwidget.cpp b/src/gui/kernel/qwidget.cpp
index 0aa1dfa283..e015f5f67f 100644
--- a/src/gui/kernel/qwidget.cpp
+++ b/src/gui/kernel/qwidget.cpp
@@ -11049,7 +11049,7 @@ bool QWidget::testAttribute_helper(Qt::WidgetAttribute attribute) const
 qreal QWidget::windowOpacity() const
 {
     Q_D(const QWidget);
-    return (isWindow() && d->maybeTopData()) ? d->maybeTopData()->opacity / 255. : 1.0;
+    return (isWindow() && d->maybeTopData()) ? d->maybeTopData()->opacity / qreal(255.) : qreal(1.0);
 }
 
 void QWidget::setWindowOpacity(qreal opacity)
diff --git a/src/gui/painting/qcolor.cpp b/src/gui/painting/qcolor.cpp
index 3d895b7753..2fe68a8e58 100644
--- a/src/gui/painting/qcolor.cpp
+++ b/src/gui/painting/qcolor.cpp
@@ -1578,7 +1578,7 @@ QColor QColor::toRgb() const
             }
 
             // chromatic case
-            const qreal h = ct.ahsv.hue == 36000 ? 0 : ct.ahsv.hue / 6000.;
+            const qreal h = ct.ahsv.hue == 36000 ? 0 : ct.ahsv.hue / qreal(6000.);
             const qreal s = ct.ahsv.saturation / qreal(USHRT_MAX);
             const qreal v = ct.ahsv.value / qreal(USHRT_MAX);
             const int i = int(h);
@@ -1638,7 +1638,7 @@ QColor QColor::toRgb() const
                 color.ct.argb.red = color.ct.argb.green = color.ct.argb.blue = 0;
             } else {
                 // chromatic case
-                const qreal h = ct.ahsl.hue == 36000 ? 0 : ct.ahsl.hue / 36000.;
+                const qreal h = ct.ahsl.hue == 36000 ? 0 : ct.ahsl.hue / qreal(36000.);
                 const qreal s = ct.ahsl.saturation / qreal(USHRT_MAX);
                 const qreal l = ct.ahsl.lightness / qreal(USHRT_MAX);
 
diff --git a/src/gui/painting/qpaintengine_raster.cpp b/src/gui/painting/qpaintengine_raster.cpp
index bcc5f9d9b7..0fea2daf08 100644
--- a/src/gui/painting/qpaintengine_raster.cpp
+++ b/src/gui/painting/qpaintengine_raster.cpp
@@ -1649,8 +1649,8 @@ void QRasterPaintEngine::stroke(const QVectorPath &path, const QPen &pen)
             if (lines[i].p1() == lines[i].p2()) {
                 if (s->lastPen.capStyle() != Qt::FlatCap) {
                     QPointF p = lines[i].p1();
-                    QLineF line = s->matrix.map(QLineF(QPointF(p.x() - width*0.5, p.y()),
-                                                       QPointF(p.x() + width*0.5, p.y())));
+                    QLineF line = s->matrix.map(QLineF(QPointF(p.x() - width*qreal(0.5), p.y()),
+                                                       QPointF(p.x() + width*qreal(0.5), p.y())));
                     d->rasterizer->rasterizeLine(line.p1(), line.p2(), 1);
                 }
                 continue;
@@ -5117,7 +5117,7 @@ static void drawEllipse_midpoint_i(const QRect &rect, const QRect &clip,
 {
     const qreal a = qreal(rect.width()) / 2;
     const qreal b = qreal(rect.height()) / 2;
-    qreal d = b*b - (a*a*b) + 0.25*a*a;
+    qreal d = b*b - (a*a*b) + qreal(0.25)*a*a;
 
     int x = 0;
     int y = (rect.height() + 1) / 2;
@@ -5140,7 +5140,7 @@ static void drawEllipse_midpoint_i(const QRect &rect, const QRect &clip,
                       pen_func, brush_func, pen_data, brush_data);
 
     // region 2
-    d = b*b*(x + 0.5)*(x + 0.5) + a*a*((y - 1)*(y - 1) - b*b);
+    d = b*b*(x + qreal(0.5))*(x + qreal(0.5)) + a*a*((y - 1)*(y - 1) - b*b);
     const int miny = rect.height() & 0x1;
     while (y > miny) {
         if (d < 0) { // select SE
diff --git a/src/gui/painting/qpaintengineex.cpp b/src/gui/painting/qpaintengineex.cpp
index 6df410b27d..eaedc4c8b4 100644
--- a/src/gui/painting/qpaintengineex.cpp
+++ b/src/gui/painting/qpaintengineex.cpp
@@ -748,8 +748,8 @@ void QPaintEngineEx::drawRoundedRect(const QRectF &rect, qreal xRadius, qreal yR
     qreal y2 = rect.bottom();
 
     if (mode == Qt::RelativeSize) {
-        xRadius = xRadius * rect.width() / 200.;
-        yRadius = yRadius * rect.height() / 200.;
+        xRadius = xRadius * rect.width() / qreal(200.);
+        yRadius = yRadius * rect.height() / qreal(200.);
     }
 
     xRadius = qMin(xRadius, rect.width() / 2);
@@ -863,7 +863,7 @@ void QPaintEngineEx::drawPoints(const QPointF *points, int pointCount)
             for (int i=0; i<count; ++i) {
                 pts[++oset] = points[i].x();
                 pts[++oset] = points[i].y();
-                pts[++oset] = points[i].x() + 1/63.;
+                pts[++oset] = points[i].x() + 1/qreal(63.);
                 pts[++oset] = points[i].y();
             }
             QVectorPath path(pts, count * 2, qpaintengineex_line_types_16, QVectorPath::LinesHint);
@@ -873,7 +873,7 @@ void QPaintEngineEx::drawPoints(const QPointF *points, int pointCount)
         }
     } else {
         for (int i=0; i<pointCount; ++i) {
-            qreal pts[] = { points[i].x(), points[i].y(), points[i].x() + 1/63., points[i].y() };
+            qreal pts[] = { points[i].x(), points[i].y(), points[i].x() + 1/qreal(63.), points[i].y() };
             QVectorPath path(pts, 2, 0);
             stroke(path, pen);
         }
@@ -894,7 +894,7 @@ void QPaintEngineEx::drawPoints(const QPoint *points, int pointCount)
             for (int i=0; i<count; ++i) {
                 pts[++oset] = points[i].x();
                 pts[++oset] = points[i].y();
-                pts[++oset] = points[i].x() + 1/63.;
+                pts[++oset] = points[i].x() + 1/qreal(63.);
                 pts[++oset] = points[i].y();
             }
             QVectorPath path(pts, count * 2, qpaintengineex_line_types_16, QVectorPath::LinesHint);
@@ -905,7 +905,7 @@ void QPaintEngineEx::drawPoints(const QPoint *points, int pointCount)
     } else {
         for (int i=0; i<pointCount; ++i) {
             qreal pts[] = { qreal(points[i].x()), qreal(points[i].y()),
-                            qreal(points[i].x() +1/63.), qreal(points[i].y()) };
+                            qreal(points[i].x() +1/qreal(63.)), qreal(points[i].y()) };
             QVectorPath path(pts, 2, 0);
             stroke(path, pen);
         }
diff --git a/src/gui/painting/qpainter.cpp b/src/gui/painting/qpainter.cpp
index efb016e9e2..fb5ce96ec7 100644
--- a/src/gui/painting/qpainter.cpp
+++ b/src/gui/painting/qpainter.cpp
@@ -403,8 +403,8 @@ void QPainterPrivate::draw_helper(const QPainterPath &originalPath, DrawOperatio
                 QPainterPath stroke = stroker.createStroke(originalPath);
                 strokeBounds = (stroke * state->matrix).boundingRect();
             } else {
-                strokeOffsetX = qAbs(penWidth * state->matrix.m11() / 2.0);
-                strokeOffsetY = qAbs(penWidth * state->matrix.m22() / 2.0);
+                strokeOffsetX = qAbs(penWidth * state->matrix.m11() / qreal(2.0));
+                strokeOffsetY = qAbs(penWidth * state->matrix.m22() / qreal(2.0));
             }
         }
     }
@@ -4460,8 +4460,8 @@ void QPainter::drawArc(const QRectF &r, int a, int alen)
     QRectF rect = r.normalized();
 
     QPainterPath path;
-    path.arcMoveTo(rect, a/16.0);
-    path.arcTo(rect, a/16.0, alen/16.0);
+    path.arcMoveTo(rect, a/qreal(16.0));
+    path.arcTo(rect, a/qreal(16.0), alen/qreal(16.0));
     strokePath(path, d->state->pen);
 }
 
@@ -4531,7 +4531,7 @@ void QPainter::drawPie(const QRectF &r, int a, int alen)
 
     QPainterPath path;
     path.moveTo(rect.center());
-    path.arcTo(rect.x(), rect.y(), rect.width(), rect.height(), a/16.0, alen/16.0);
+    path.arcTo(rect.x(), rect.y(), rect.width(), rect.height(), a/qreal(16.0), alen/qreal(16.0));
     path.closeSubpath();
     drawPath(path);
 
@@ -4592,8 +4592,8 @@ void QPainter::drawChord(const QRectF &r, int a, int alen)
     QRectF rect = r.normalized();
 
     QPainterPath path;
-    path.arcMoveTo(rect, a/16.0);
-    path.arcTo(rect, a/16.0, alen/16.0);
+    path.arcMoveTo(rect, a/qreal(16.0));
+    path.arcTo(rect, a/qreal(16.0), alen/qreal(16.0));
     path.closeSubpath();
     drawPath(path);
 }
@@ -9242,7 +9242,7 @@ void QPainter::drawPixmapFragments(const PixmapFragment *fragments, int fragment
             qreal h = fragments[i].scaleY * fragments[i].height;
             QRectF sourceRect(fragments[i].sourceLeft, fragments[i].sourceTop,
                               fragments[i].width, fragments[i].height);
-            drawPixmap(QRectF(-0.5 * w + xOffset, -0.5 * h + yOffset, w, h), pixmap, sourceRect);
+            drawPixmap(QRectF(qreal(-0.5) * w + xOffset, qreal(-0.5) * h + yOffset, w, h), pixmap, sourceRect);
         }
 
         setOpacity(oldOpacity);
diff --git a/src/gui/painting/qrasterizer.cpp b/src/gui/painting/qrasterizer.cpp
index 1d3f581b88..ca10e6aa68 100644
--- a/src/gui/painting/qrasterizer.cpp
+++ b/src/gui/painting/qrasterizer.cpp
@@ -51,8 +51,8 @@
 QT_BEGIN_NAMESPACE
 
 typedef int Q16Dot16;
-#define Q16Dot16ToFloat(i) ((i)/65536.)
-#define FloatToQ16Dot16(i) (int)((i) * 65536.)
+#define Q16Dot16ToFloat(i) ((i)/qreal(65536.))
+#define FloatToQ16Dot16(i) (int)((i) * qreal(65536.))
 #define IntToQ16Dot16(i) ((i) << 16)
 #define Q16Dot16ToInt(i) ((i) >> 16)
 #define Q16Dot16Factor 65536
@@ -701,7 +701,7 @@ static Q16Dot16 intersectPixelFP(int x, Q16Dot16 top, Q16Dot16 bottom, Q16Dot16
 
 static inline bool q26Dot6Compare(qreal p1, qreal p2)
 {
-    return int((p2  - p1) * 64.) == 0;
+    return int((p2  - p1) * qreal(64.)) == 0;
 }
 
 static inline qreal qFloorF(qreal v)
@@ -1210,8 +1210,8 @@ void QRasterizer::rasterize(const QPainterPath &path, Qt::FillRule fillRule)
 
     QRectF bounds = path.controlPointRect();
 
-    int iTopBound = qMax(d->clipRect.top(), int(bounds.top() + 0.5 + (COORD_OFFSET - COORD_ROUNDING)/64.));
-    int iBottomBound = qMin(d->clipRect.bottom(), int(bounds.bottom() - 0.5 + (COORD_OFFSET - COORD_ROUNDING)/64.));
+    int iTopBound = qMax(d->clipRect.top(), int(bounds.top() + qreal(0.5) + (COORD_OFFSET - COORD_ROUNDING)/qreal(64.)));
+    int iBottomBound = qMin(d->clipRect.bottom(), int(bounds.bottom() - qreal(0.5) + (COORD_OFFSET - COORD_ROUNDING)/qreal(64.)));
 
     if (iTopBound > iBottomBound)
         return;
diff --git a/src/gui/painting/qtessellator.cpp b/src/gui/painting/qtessellator.cpp
index 94a5128d90..15e4f65469 100644
--- a/src/gui/painting/qtessellator.cpp
+++ b/src/gui/painting/qtessellator.cpp
@@ -1400,7 +1400,7 @@ void QTessellator::tessellateRect(const QPointF &a_, const QPointF &b_, qreal wi
     if (delta.x == 0 && delta.y == 0)
         return;
 
-    qreal hw = 0.5 * width;
+    qreal hw = qreal(0.5) * width;
 
     if (delta.x == 0) {
         Q27Dot5 halfWidth = FloatToQ27Dot5(hw);
diff --git a/src/gui/styles/qs60style.cpp b/src/gui/styles/qs60style.cpp
index eec2d15ca7..59bd0dd657 100644
--- a/src/gui/styles/qs60style.cpp
+++ b/src/gui/styles/qs60style.cpp
@@ -1679,7 +1679,7 @@ void QS60Style::drawControl(ControlElement element, const QStyleOption *option,
                 QS60StylePrivate::drawSkinPart(QS60StyleEnums::SP_QgnGrafBarWaitAnim,
                         painter, progressRect, flags | orientationFlag | QS60StylePrivate::SF_Animation );
             } else {
-                const qreal progressFactor = (optionProgressBar->minimum == optionProgressBar->maximum) ? 1.0
+                const qreal progressFactor = (optionProgressBar->minimum == optionProgressBar->maximum) ? qreal(1.0)
                     : (qreal)optionProgressBar->progress / optionProgressBar->maximum;
                 const int frameWidth = pixelMetric(PM_DefaultFrameWidth, option, widget);
                 if (optionProgressBar->orientation == Qt::Horizontal) {
@@ -2010,7 +2010,7 @@ void QS60Style::drawControl(ControlElement element, const QStyleOption *option,
                 if (focusFrame->widget() && focusFrame->widget()->hasEditFocus())
                     editFocus = true;
             }
-            const qreal opacity = editFocus ? 1 : 0.75; // Trial and error factors. Feel free to improve.
+            const qreal opacity = editFocus ? 1 : qreal(0.75); // Trial and error factors. Feel free to improve.
 #else
             const qreal opacity = 0.85;
 #endif
@@ -2148,8 +2148,8 @@ void QS60Style::drawPrimitive(PrimitiveElement element, const QStyleOption *opti
     case PE_IndicatorRadioButton: {
             QRect buttonRect = option->rect;
             //there is empty (a. 33%) space in svg graphics for radiobutton
-            const qreal reduceWidth = (qreal)buttonRect.width() / 3.0;
-            const qreal rectWidth = (qreal)option->rect.width() != 0 ? option->rect.width() : 1.0;
+            const qreal reduceWidth = (qreal)buttonRect.width() / qreal(3.0);
+            const qreal rectWidth = (qreal)option->rect.width() != 0 ? option->rect.width() : qreal(1.0);
             // Try to occupy the full area
             const qreal scaler = 1 + (reduceWidth/rectWidth);
             buttonRect.setWidth((int)((buttonRect.width()-reduceWidth) * scaler));
diff --git a/src/gui/styles/qstylesheetstyle.cpp b/src/gui/styles/qstylesheetstyle.cpp
index 7d2ed2af8c..c066631c3d 100644
--- a/src/gui/styles/qstylesheetstyle.cpp
+++ b/src/gui/styles/qstylesheetstyle.cpp
@@ -1247,20 +1247,20 @@ QPainterPath QRenderRule::borderClip(QRect r)
     const QRectF rect(r);
     const int *borders = border()->borders;
     QPainterPath path;
-    qreal curY = rect.y() + borders[TopEdge]/2.0;
+    qreal curY = rect.y() + borders[TopEdge]/qreal(2.0);
     path.moveTo(rect.x() + tlr.width(), curY);
     path.lineTo(rect.right() - trr.width(), curY);
-    qreal curX = rect.right() - borders[RightEdge]/2.0;
+    qreal curX = rect.right() - borders[RightEdge]/qreal(2.0);
     path.arcTo(curX - 2*trr.width() + borders[RightEdge], curY,
                trr.width()*2 - borders[RightEdge], trr.height()*2 - borders[TopEdge], 90, -90);
 
     path.lineTo(curX, rect.bottom() - brr.height());
-    curY = rect.bottom() - borders[BottomEdge]/2.0;
+    curY = rect.bottom() - borders[BottomEdge]/qreal(2.0);
     path.arcTo(curX - 2*brr.width() + borders[RightEdge], curY - 2*brr.height() + borders[BottomEdge],
                brr.width()*2 - borders[RightEdge], brr.height()*2 - borders[BottomEdge], 0, -90);
 
     path.lineTo(rect.x() + blr.width(), curY);
-    curX = rect.left() + borders[LeftEdge]/2.0;
+    curX = rect.left() + borders[LeftEdge]/qreal(2.0);
     path.arcTo(curX, rect.bottom() - 2*blr.height() + borders[BottomEdge]/2,
                blr.width()*2 - borders[LeftEdge], blr.height()*2 - borders[BottomEdge], 270, -90);
 
@@ -3810,7 +3810,7 @@ void QStyleSheetStyle::drawControl(ControlElement ce, const QStyleOption *opt, Q
                 if (inverted)
                     reverse = !reverse;
                 const bool indeterminate = pb->minimum == pb->maximum;
-                qreal fillRatio = indeterminate ? 0.50 : qreal(progress - minimum)/(maximum - minimum);
+                qreal fillRatio = indeterminate ? qreal(0.50) : qreal(progress - minimum)/(maximum - minimum);
                 int fillWidth = int(rect.width() * fillRatio);
                 int chunkWidth = fillWidth;
                 if (subRule.hasContentsSize()) {
diff --git a/src/gui/text/qfontdatabase.cpp b/src/gui/text/qfontdatabase.cpp
index 1d463c47b2..796c455d37 100644
--- a/src/gui/text/qfontdatabase.cpp
+++ b/src/gui/text/qfontdatabase.cpp
@@ -1994,7 +1994,7 @@ QList<int> QFontDatabase::pointSizes(const QString &family,
                 const QtFontSize *size = style->pixelSizes + l;
 
                 if (size->pixelSize != 0 && size->pixelSize != USHRT_MAX) {
-                    const uint pointSize = qRound(size->pixelSize * 72.0 / dpi);
+                    const uint pointSize = qRound(size->pixelSize * qreal(72.0) / dpi);
                     if (! sizes.contains(pointSize))
                         sizes.append(pointSize);
                 }
@@ -2105,7 +2105,7 @@ QList<int> QFontDatabase::smoothSizes(const QString &family,
                 const QtFontSize *size = style->pixelSizes + l;
 
                 if (size->pixelSize != 0 && size->pixelSize != USHRT_MAX) {
-                    const uint pointSize = qRound(size->pixelSize * 72.0 / dpi);
+                    const uint pointSize = qRound(size->pixelSize * qreal(72.0) / dpi);
                     if (! sizes.contains(pointSize))
                         sizes.append(pointSize);
                 }
diff --git a/src/gui/text/qfontengine.cpp b/src/gui/text/qfontengine.cpp
index c9b672bb89..8f46a805cc 100644
--- a/src/gui/text/qfontengine.cpp
+++ b/src/gui/text/qfontengine.cpp
@@ -381,9 +381,9 @@ void QFontEngine::getGlyphBearings(glyph_t glyph, qreal *leftBearing, qreal *rig
     glyph_metrics_t gi = boundingBox(glyph);
     bool isValid = gi.isValid();
     if (leftBearing != 0)
-        *leftBearing = isValid ? gi.x.toReal() : 0.0;
+        *leftBearing = isValid ? gi.x.toReal() : qreal(0.0);
     if (rightBearing != 0)
-        *rightBearing = isValid ? (gi.xoff - gi.x - gi.width).toReal() : 0.0;
+        *rightBearing = isValid ? (gi.xoff - gi.x - gi.width).toReal() : qreal(0.0);
 }
 
 glyph_metrics_t QFontEngine::tightBoundingBox(const QGlyphLayout &glyphs)
diff --git a/src/gui/text/qtextdocument.cpp b/src/gui/text/qtextdocument.cpp
index 143dc1ab8c..de2e27ad2e 100644
--- a/src/gui/text/qtextdocument.cpp
+++ b/src/gui/text/qtextdocument.cpp
@@ -159,7 +159,7 @@ bool Qt::mightBeRichText(const QString& text)
 QString Qt::escape(const QString& plain)
 {
     QString rich;
-    rich.reserve(int(plain.length() * 1.1));
+    rich.reserve(int(plain.length() * qreal(1.1)));
     for (int i = 0; i < plain.length(); ++i) {
         if (plain.at(i) == QLatin1Char('<'))
             rich += QLatin1String("&lt;");
diff --git a/src/gui/widgets/qprogressbar.cpp b/src/gui/widgets/qprogressbar.cpp
index dd92bda993..1b0a1a118c 100644
--- a/src/gui/widgets/qprogressbar.cpp
+++ b/src/gui/widgets/qprogressbar.cpp
@@ -462,7 +462,7 @@ QString QProgressBar::text() const
         return result;
     }
 
-    int progress = (qreal(d->value) - d->minimum) * 100.0 / totalSteps;
+    int progress = (qreal(d->value) - d->minimum) * qreal(100.0) / totalSteps;
     result.replace(QLatin1String("%p"), QString::number(progress));
     return result;
 }