Add qHash implementation for QPoint

[ChangeLog][QtCore][QPoint] Added qHash() implementation.

Change-Id: I65332e7aafab53af40a6e11457b9b457196d584c
Fixes: QTBUG-86457
Reviewed-by: Thorbjørn Lindeijer <bjorn@lindeijer.nl>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

examples/embedded/lightmaps/slippymap.cpp

@@ -53,19 +53,6 @@
 #include "slippymap.h"
 #include "qmath.h"
 
-#ifdef QT_NAMESPACE
-QT_BEGIN_NAMESPACE
-size_t qHash(const QT_NAMESPACE::QPoint& p)
-#else
-size_t qHash(const QPoint& p)
-#endif
-{
-    return p.x() * 17 ^ p.y();
-}
-#ifdef QT_NAMESPACE
-QT_END_NAMESPACE
-#endif
-
 // tile size in pixels
 const int tdim = 256;
 

src/corelib/tools/qpoint.cpp

@@ -41,6 +41,7 @@
 #include "qdatastream.h"
 
 #include <private/qdebug_p.h>
+#include <QtCore/qhashfunctions.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -483,6 +484,19 @@ QDebug operator<<(QDebug dbg, const QPointF &p)
 }
 #endif
 
+/*!
+    \fn size_t qHash(QPoint key, size_t seed = 0)
+    \relates QHash
+    \since 6.0
+
+    Returns the hash value for the \a key, using \a seed to seed the
+    calculation.
+*/
+size_t qHash(QPoint key, size_t seed) noexcept
+{
+    return qHashMulti(seed, key.x(), key.y());
+}
+
 /*!
     \class QPointF
     \inmodule QtCore

src/corelib/tools/qpoint.h

@@ -214,6 +214,7 @@ constexpr inline const QPoint operator/(const QPoint &p, qreal c)
 Q_CORE_EXPORT QDebug operator<<(QDebug, const QPoint &);
 #endif
 
+Q_CORE_EXPORT size_t qHash(QPoint key, size_t seed = 0) noexcept;
 
 
 

tests/auto/corelib/tools/qpoint/tst_qpoint.cpp

@@ -346,6 +346,9 @@ void tst_QPoint::operator_eq()
     QCOMPARE(equal, expectEqual);
     bool notEqual = point1 != point2;
     QCOMPARE(notEqual, !expectEqual);
+
+    if (equal)
+        QCOMPARE(qHash(point1), qHash(point2));
 }
 
 #ifndef QT_NO_DATASTREAM

tests/auto/gui/painting/qpainter/tst_qpainter.cpp

@@ -3256,11 +3256,6 @@ void tst_QPainter::imageScaling_task206785()
 #define FOR_EACH_NEIGHBOR_8 for (int dx = -1; dx <= 1; ++dx) for (int dy = -1; dy <= 1; ++dy) if (dx != 0 || dy != 0)
 #define FOR_EACH_NEIGHBOR_4 for (int dx = -1; dx <= 1; ++dx) for (int dy = -1; dy <= 1; ++dy) if ((dx == 0) != (dy == 0))
 
-size_t qHash(const QPoint &point)
-{
-    return qHash(qMakePair(point.x(), point.y()));
-}
-
 bool verifyOutlineFillConsistency(const QImage &img, QRgb outside, QRgb inside, QRgb outline)
 {
     if (img.pixel(img.width() / 2, img.height() / 2) != inside)