Define QCamera::FrameRateRange as a struct.

Instead of an alias for QPair<qreal, qreal>.

Task-number: QTBUG-46563
Change-Id: I7e1ac68242810f7e5f7e161571a11f5de7850e29
Reviewed-by: Christian Stromme <christian.stromme@theqtcompany.com>

src/imports/multimedia/qdeclarativecamera.cpp

@@ -1094,8 +1094,8 @@ QJSValue QDeclarativeCamera::supportedViewfinderFrameRateRanges(const QSize &res
     int i = 0;
     Q_FOREACH (const QCamera::FrameRateRange &frameRateRange, frameRateRanges) {
         QJSValue range = engine->newObject();
-        range.setProperty(QStringLiteral("minimumFrameRate"), frameRateRange.first);
+        range.setProperty(QStringLiteral("minimumFrameRate"), frameRateRange.minimumFrameRate);
-        range.setProperty(QStringLiteral("maximumFrameRate"), frameRateRange.second);
+        range.setProperty(QStringLiteral("maximumFrameRate"), frameRateRange.maximumFrameRate);
         supportedFrameRateRanges.setProperty(i++, range);
     }
 

src/multimedia/camera/qcamera.cpp

@@ -72,7 +72,7 @@ static bool qt_sizeLessThan(const QSize &s1, const QSize &s2)
 
 static bool qt_frameRateRangeLessThan(const QCamera::FrameRateRange &s1, const QCamera::FrameRateRange &s2)
 {
-    return s1.second < s2.second;
+    return s1.maximumFrameRate < s2.maximumFrameRate;
 }
 
 /*!
@@ -1028,15 +1028,29 @@ void QCamera::unlock()
 
 
 /*!
-    \typedef QCamera::FrameRateRange
+    \class QCamera::FrameRateRange
+    \inmodule QtMultimedia
+    \ingroup multimedia
+    \ingroup multimedia_camera
+    \since 5.5
 
-    This is a typedef for QPair<qreal, qreal>.
+    \brief A FrameRateRange represents a range of frame rates as minimum and maximum rate.
 
-    A frame rate range contains a minimum and a maximum frame rate, respectively the first and
+    If the minimum frame rate is equal to the maximum frame rate, the frame rate is fixed.
-    second element of the pair. If the minimum frame rate is equal to the maximum frame rate, the
+    If not, the actual frame rate fluctuates between the minimum and the maximum.
-    frame rate is fixed. If not, the actual frame rate fluctuates between the minimum and the maximum.
+
+    \sa QCamera::supportedViewfinderFrameRateRanges(), QCameraViewfinderSettings
 */
 
+/*!
+    \variable QCamera::FrameRateRange::minimumFrameRate
+    The minimum frame rate supported by the range, in frames per second.
+*/
+
+/*!
+    \variable QCamera::FrameRateRange::maximumFrameRate
+    The maximum frame rate supported by the range, in frames per second.
+*/
 
 /*!
     \enum QCamera::State

src/multimedia/camera/qcamera.h

@@ -77,7 +77,21 @@ class Q_MULTIMEDIA_EXPORT QCamera : public QMediaObject
     Q_ENUMS(LockType)
     Q_ENUMS(Position)
 public:
-    typedef QPair<qreal, qreal> FrameRateRange;
+    struct FrameRateRange
+    {
+        Q_DECL_CONSTEXPR FrameRateRange() Q_DECL_NOTHROW
+            : minimumFrameRate(0)
+            , maximumFrameRate(0)
+        { }
+
+        Q_DECL_CONSTEXPR FrameRateRange(qreal minimum, qreal maximum) Q_DECL_NOTHROW
+            : minimumFrameRate(minimum)
+            , maximumFrameRate(maximum)
+        { }
+
+        qreal minimumFrameRate;
+        qreal maximumFrameRate;
+    };
 
     enum Status {
         UnavailableStatus,
@@ -237,6 +251,14 @@ private:
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(QCamera::LockTypes)
 
+Q_DECL_CONSTEXPR Q_INLINE_TEMPLATE bool operator==(const QCamera::FrameRateRange &r1, const QCamera::FrameRateRange &r2) Q_DECL_NOTHROW
+{ return r1.minimumFrameRate == r2.minimumFrameRate && r1.maximumFrameRate == r2.maximumFrameRate; }
+
+Q_DECL_CONSTEXPR Q_INLINE_TEMPLATE bool operator!=(const QCamera::FrameRateRange &r1, const QCamera::FrameRateRange &r2) Q_DECL_NOTHROW
+{ return !(r1 == r2); }
+
+Q_DECLARE_TYPEINFO(QCamera::FrameRateRange, Q_PRIMITIVE_TYPE);
+
 QT_END_NAMESPACE
 
 Q_DECLARE_METATYPE(QCamera::State)

src/plugins/directshow/camera/dscamerasession.cpp

@@ -789,7 +789,7 @@ void DSCameraSession::disconnectGraph()
 
 static bool qt_frameRateRangeGreaterThan(const QCamera::FrameRateRange &r1, const QCamera::FrameRateRange &r2)
 {
-    return r1.second > r2.second;
+    return r1.maximumFrameRate > r2.maximumFrameRate;
 }
 
 void DSCameraSession::updateSourceCapabilities()
@@ -896,8 +896,8 @@ void DSCameraSession::updateSourceCapabilities()
                 Q_FOREACH (const QCamera::FrameRateRange &frameRateRange, frameRateRanges) {
                     QCameraViewfinderSettings settings;
                     settings.setResolution(resolution);
-                    settings.setMinimumFrameRate(frameRateRange.first);
+                    settings.setMinimumFrameRate(frameRateRange.minimumFrameRate);
-                    settings.setMaximumFrameRate(frameRateRange.second);
+                    settings.setMaximumFrameRate(frameRateRange.maximumFrameRate);
                     settings.setPixelFormat(pixelFormat);
                     m_supportedViewfinderSettings.append(settings);