darwin: Add Foundation conversion functions for QSize/QSizeF

The fromCGPoint function was left out for QSize, as the foundation type is
using CGFloats internally. Clients should use an explicit QSizeF::toSize()
when potentially throwing away precision.

Change-Id: I12d43ae0881f09ad8d79f2caaa000c3983f4ef30
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>
Reviewed-by: Jake Petroules <jake.petroules@qt.io>

src/corelib/kernel/qcore_foundation.mm

@@ -496,5 +496,42 @@ QPointF QPointF::fromCGPoint(CGPoint point) Q_DECL_NOTHROW
     return QPointF(point.x, point.y);
 }
 
+// ----------------------------------------------------------------------------
+
+/*!
+    \since 5.8
+
+    Creates a CGSize from a QSize.
+
+    \sa fromCGSize()
+*/
+CGSize QSize::toCGSize() const Q_DECL_NOTHROW
+{
+    return CGSizeMake(width(), height());
+}
+
+/*!
+    \since 5.8
+
+    Creates a CGSize from a QSizeF.
+
+    \sa fromCGSize()
+*/
+CGSize QSizeF::toCGSize() const Q_DECL_NOTHROW
+{
+    return CGSizeMake(width(), height());
+}
+
+/*!
+    \since 5.8
+
+    Creates a QRectF from a CGSize.
+
+    \sa toCGSize()
+*/
+QSizeF QSizeF::fromCGSize(CGSize size) Q_DECL_NOTHROW
+{
+    return QSizeF(size.width, size.height);
+}
 
 QT_END_NAMESPACE

src/corelib/tools/qsize.h

@@ -42,6 +42,10 @@
 
 #include <QtCore/qnamespace.h>
 
+#if defined(Q_OS_DARWIN)
+struct CGSize;
+#endif
+
 QT_BEGIN_NAMESPACE
 
 
@@ -86,6 +90,10 @@ public:
     friend inline Q_DECL_CONSTEXPR const QSize operator*(qreal, const QSize &) Q_DECL_NOTHROW;
     friend inline const QSize operator/(const QSize &, qreal);
 
+#if defined(Q_OS_DARWIN) || defined(Q_QDOC)
+    CGSize toCGSize() const Q_DECL_NOTHROW Q_REQUIRED_RESULT;
+#endif
+
 private:
     int wd;
     int ht;
@@ -248,6 +256,11 @@ public:
 
     Q_DECL_CONSTEXPR inline QSize toSize() const Q_DECL_NOTHROW;
 
+#if defined(Q_OS_DARWIN) || defined(Q_QDOC)
+    static QSizeF fromCGSize(CGSize size) Q_DECL_NOTHROW Q_REQUIRED_RESULT;
+    CGSize toCGSize() const Q_DECL_NOTHROW Q_REQUIRED_RESULT;
+#endif
+
 private:
     qreal wd;
     qreal ht;

src/plugins/platforms/cocoa/qcocoadrag.mm

@@ -128,7 +128,7 @@ Qt::DropAction QCocoaDrag::drag(QDrag *o)
     QPixmap pm = dragPixmap(m_drag, hotSpot);
     QSize pmDeviceIndependentSize = pm.size() / pm.devicePixelRatio();
     NSImage *nsimage = qt_mac_create_nsimage(pm);
-    [nsimage setSize : qt_mac_toNSSize(pmDeviceIndependentSize)];
+    [nsimage setSize:pmDeviceIndependentSize.toCGSize()];
 
     QMacPasteboard dragBoard((CFStringRef) NSDragPboard, QMacInternalPasteboardMime::MIME_DND);
     m_drag->mimeData()->setData(QLatin1String("application/x-qt-mime-type-name"), QByteArray("dummy"));

src/plugins/platforms/cocoa/qcocoahelpers.h

@@ -77,8 +77,6 @@ CGImageRef qt_mac_toCGImageMask(const QImage &qImage);
 QImage qt_mac_toQImage(CGImageRef image);
 QPixmap qt_mac_toQPixmap(const NSImage *image, const QSizeF &size);
 
-NSSize qt_mac_toNSSize(const QSize &qtSize);
-
 QColor qt_mac_toQColor(const NSColor *color);
 QColor qt_mac_toQColor(CGColorRef color);
 

src/plugins/platforms/cocoa/qcocoahelpers.mm

@@ -209,11 +209,6 @@ HIMutableShapeRef qt_mac_QRegionToHIMutableShape(const QRegion &region)
     return shape;
 }
 
-NSSize qt_mac_toNSSize(const QSize &qtSize)
-{
-    return NSMakeSize(qtSize.width(), qtSize.height());
-}
-
 QColor qt_mac_toQColor(const NSColor *color)
 {
     QColor qtColor;

src/plugins/platforms/cocoa/qcocoawindow.mm

@@ -1107,11 +1107,10 @@ void QCocoaWindow::propagateSizeHints()
 
     // sizeIncrement is observed to take values of (-1, -1) and (0, 0) for windows that should be
     // resizable and that have no specific size increment set. Cocoa expects (1.0, 1.0) in this case.
-    const QSize sizeIncrement = windowSizeIncrement();
+    QSize sizeIncrement = windowSizeIncrement();
-    if (!sizeIncrement.isEmpty())
+    if (sizeIncrement.isEmpty())
-        [m_nsWindow setResizeIncrements : qt_mac_toNSSize(sizeIncrement)];
+        sizeIncrement = QSize(1, 1);
-    else
+    [m_nsWindow setResizeIncrements:sizeIncrement.toCGSize()];
-        [m_nsWindow setResizeIncrements : NSMakeSize(1.0, 1.0)];
 
     QRect rect = geometry();
     QSize baseSize = windowBaseSize();