Include what you use: qquaternion.h

qmatrix4x4.h will lose its qquaternion.h include, so include
qquaternion.h explicitly in all files that mention 'QQuaternion',
unless, for a foo.cpp, the own foo.h has already included it.

Also add forward declarations, where needed.

Amends the start of this module's history.

Pick-to: 6.9 6.8
Change-Id: I605bf742be5bb92a676704f12d738d241bd9b0da
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
(cherry picked from commit 6a44c5fe57)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

examples/graphs/3d/widgetgraphgallery/surfacegraphmodifier.cpp

@@ -8,7 +8,9 @@
 #include <QtCore/qmath.h>
 #include <QtGraphs/qgraphstheme.h>
 #include <QtGraphs/qvalue3daxis.h>
+
 #include <QtGui/qimage.h>
+#include <QtGui/qquaternion.h>
 
 using namespace Qt::StringLiterals;
 

src/graphs3d/data/qbar3dseries.cpp

@@ -9,6 +9,8 @@
 #include "qvalue3daxis_p.h"
 #include "qgraphs3dlogging_p.h"
 
+#include <QtGui/qquaternion.h>
+
 QT_BEGIN_NAMESPACE
 
 /*!

src/graphs3d/data/qbar3dseries.h

@@ -11,6 +11,7 @@
 QT_BEGIN_NAMESPACE
 
 class QBar3DSeriesPrivate;
+class QQuaternion;
 
 class Q_GRAPHS_EXPORT QBar3DSeries : public QAbstract3DSeries
 {

src/graphs3d/data/qcustom3dvolume.cpp

@@ -5,6 +5,8 @@
 #include "qcustom3dvolume_p.h"
 #include "qgraphs3dlogging_p.h"
 
+#include <QtGui/qquaternion.h>
+
 QT_BEGIN_NAMESPACE
 
 /*!

src/graphs3d/data/qcustom3dvolume.h

@@ -12,6 +12,7 @@
 QT_BEGIN_NAMESPACE
 
 class QCustom3DVolumePrivate;
+class QQuaternion;
 
 class Q_GRAPHS_EXPORT QCustom3DVolume : public QCustom3DItem
 {

src/graphs3d/data/qcustom3dvolume_p.h

@@ -19,6 +19,8 @@
 
 QT_BEGIN_NAMESPACE
 
+class QQuaternion;
+
 struct QCustomVolumeDirtyBitField
 {
     bool textureDimensionsDirty : 1;

src/graphs3d/data/scatteritemmodelhandler.cpp

@@ -4,6 +4,8 @@
 #include "qscatter3dseries_p.h"
 #include "scatteritemmodelhandler_p.h"
 
+#include <QtGui/qquaternion.h>
+
 QT_BEGIN_NAMESPACE
 
 ScatterItemModelHandler::ScatterItemModelHandler(QItemModelScatterDataProxy *proxy, QObject *parent)

src/graphs3d/engine/barinstancing_p.h

@@ -16,6 +16,8 @@
 #include <QtGraphs/qgraphsglobal.h>
 #include <private/qquick3dinstancing_p.h>
 
+#include <QtGui/qquaternion.h>
+
 struct BarItemHolder
 {
     QVector3D position = {.0f, .0f, .0f};

src/graphs3d/engine/scatterinstancing_p.h

@@ -17,6 +17,8 @@
 #include <QtGraphs/qgraphsglobal.h>
 #include <private/qquick3dinstancing_p.h>
 
+#include <QtGui/qquaternion.h>
+
 struct DataItemHolder
 {
     QVector3D position;

src/graphs3d/qml/qquickgraphsbars.cpp

@@ -19,6 +19,8 @@
 #include <QtQuick3D/private/qquick3drepeater_p.h>
 #include <QtQuick/qquickitemgrabresult.h>
 
+#include <QtGui/qquaternion.h>
+
 /*!
  * \qmltype Bars3D
  * \inherits GraphsItem3D

src/graphs3d/qml/qquickgraphsitem.cpp

@@ -31,6 +31,8 @@
 #include <QtQuick3D/private/qquick3dprincipledmaterial_p.h>
 #include <QtQuick3D/private/qquick3drepeater_p.h>
 
+#include <QtGui/qquaternion.h>
+
 #if defined(Q_OS_IOS)
 #include <QtCore/QTimer>
 #endif

src/graphs3d/qml/qquickgraphsitem_p.h

@@ -33,6 +33,7 @@ class QCustom3DVolume;
 class QCustom3DLabel;
 class QGraphsInputHandler;
 class QGraphsTheme;
+class QQuaternion;
 class QQuick3DCustomMaterial;
 class QQuick3DDirectionalLight;
 class QQuick3DPrincipledMaterial;

src/graphs3d/qml/qquickgraphsscatter.cpp

@@ -20,6 +20,8 @@
 #include <QtQuick3D/private/qquick3dprincipledmaterial_p.h>
 #include <QtQuick3D/private/qquick3drepeater_p.h>
 
+#include <QtGui/qquaternion.h>
+
 QT_BEGIN_NAMESPACE
 
 static const int insertRemoveRecordReserveSize = 31;

tests/auto/cpptest/qgbars-series/tst_series.cpp

@@ -5,6 +5,8 @@
 
 #include <QtGraphs/QBar3DSeries>
 
+#include <QtGui/qquaternion.h>
+
 class tst_series: public QObject
 {
     Q_OBJECT

tests/auto/cpptest/qgcustom-label/tst_custom.cpp

@@ -7,6 +7,8 @@
 
 #include "cpptestutil.h"
 
+#include <QtGui/qquaternion.h>
+
 class tst_custom: public QObject
 {
     Q_OBJECT

tests/auto/cpptest/qgcustom/tst_custom.cpp

@@ -5,6 +5,8 @@
 
 #include <QtGraphs/QCustom3DItem>
 
+#include <QtGui/qquaternion.h>
+
 class tst_custom: public QObject
 {
     Q_OBJECT

tests/auto/cpptest/qgscatter-series/tst_series.cpp

@@ -5,6 +5,8 @@
 
 #include <QtGraphs/QScatter3DSeries>
 
+#include <QtGui/qquaternion.h>
+
 class tst_series: public QObject
 {
     Q_OBJECT

tests/auto/cpptest/qgspline-series/tst_series.cpp

@@ -5,6 +5,8 @@
 
 #include <QtGraphs/QSpline3DSeries>
 
+#include <QtGui/qquaternion.h>
+
 class tst_series : public QObject
 {
     Q_OBJECT

tests/manual/barstest/chart.cpp

@@ -9,6 +9,9 @@
 #include <QtGraphs/q3dscene.h>
 #include <QtGraphs/qgraphstheme.h>
 #include <QtGraphs/qcustom3ditem.h>
+
+#include <QtGui/qquaternion.h>
+
 #include <QtCore/QRandomGenerator>
 #include <QtCore/QElapsedTimer>
 #include <QtCore/qmath.h>

tests/manual/directional/scatterdatamodifier.cpp

@@ -9,6 +9,8 @@
 #include <qmath.h>
 #include <QComboBox>
 
+#include <QtGui/qquaternion.h>
+
 const int numberOfCols = 8;
 const int numberOfRows = 8;
 const float limit = 8.0f;

tests/manual/rotations/scatterdatamodifier.cpp

@@ -7,6 +7,9 @@
 #include <QtGraphs/q3dscene.h>
 #include <QtGraphs/qscatter3dseries.h>
 #include <QtGraphs/QCustom3DItem>
+
+#include <QtGui/qquaternion.h>
+
 #include <QtCore/qmath.h>
 
 static const float verticalRange = 8.0f;

tests/manual/volumetrictest/volumetrictest.cpp

@@ -11,6 +11,9 @@
 #include <QtGui/QRgb>
 #include <QtGui/QImage>
 #include <QtWidgets/QLabel>
+
+#include <QtGui/qquaternion.h>
+
 #include <QtCore/QDebug>
 
 const int imageCount = 512;