From b2d7d776405c19aef5c0fe930c56f13fdf8fe415 Mon Sep 17 00:00:00 2001
From: Uwe Rathmann <Uwe.Rathmann@tigertal.de>
Date: Fri, 23 Sep 2022 17:49:49 +0200
Subject: [PATCH] QskStrokeNode introduced ( untested so far )

---
 src/nodes/QskStrokeNode.cpp | 88 +++++++++++++++++++++++++++++++++++++
 src/nodes/QskStrokeNode.h   | 28 ++++++++++++
 src/src.pro                 |  2 +
 3 files changed, 118 insertions(+)
 create mode 100644 src/nodes/QskStrokeNode.cpp
 create mode 100644 src/nodes/QskStrokeNode.h

diff --git a/src/nodes/QskStrokeNode.cpp b/src/nodes/QskStrokeNode.cpp
new file mode 100644
index 00000000..671c3c71
--- /dev/null
+++ b/src/nodes/QskStrokeNode.cpp
@@ -0,0 +1,88 @@
+/******************************************************************************
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
+ *****************************************************************************/
+
+#include "QskStrokeNode.h"
+#include <qsgflatcolormaterial.h>
+
+QSK_QT_PRIVATE_BEGIN
+#include <private/qsgnode_p.h>
+#include <private/qtriangulatingstroker_p.h>
+QSK_QT_PRIVATE_END
+
+class QskStrokeNodePrivate final : public QSGGeometryNodePrivate
+{
+  public:
+    QskStrokeNodePrivate()
+        : geometry( QSGGeometry::defaultAttributes_Point2D(), 0 )
+    {
+        geometry.setDrawingMode( QSGGeometry::DrawTriangleStrip );
+    }
+
+    QSGGeometry geometry;
+    QSGFlatColorMaterial material;
+};
+
+QskStrokeNode::QskStrokeNode()
+    : QSGGeometryNode( *new QskStrokeNodePrivate )
+{
+    Q_D( QskStrokeNode );
+
+    setGeometry( &d->geometry );
+    setMaterial( &d->material );
+}
+
+void QskStrokeNode::updateNode( const QPainterPath& path, const QPen& pen )
+{
+    Q_D( QskStrokeNode );
+
+    if ( path.isEmpty() || ( pen.style() == Qt::NoPen ) || ( pen.color().alpha() == 0 ) )
+    {
+        if ( d->geometry.vertexCount() > 0 )
+        {
+            d->geometry.allocate( 0 );
+            markDirty( QSGNode::DirtyGeometry );
+        }
+
+        return;
+    }
+
+    if ( true ) // For the moment we always update the geometry. TODO ...
+    {
+        const QVectorPath& vectorPath = qtVectorPathForPath(path);
+
+        QTriangulatingStroker stroker;
+
+        if ( pen.style() == Qt::SolidLine )
+        {
+            // clipRect, renderHint are ignored in QTriangulatingStroker::process
+            stroker.process( vectorPath, pen, {}, {} );
+        }
+        else
+        {
+            QDashedStrokeProcessor dashStroker;
+            dashStroker.process( vectorPath, pen, QRectF(), {} ); // empty rect: no clipping
+
+            const QVectorPath dashedVectorPath( dashStroker.points(),
+                dashStroker.elementCount(), dashStroker.elementTypes(), 0 );
+
+            stroker.process( dashedVectorPath, pen, {}, {} );
+        }
+
+        d->geometry.allocate( stroker.vertexCount() );
+
+        memcpy( d->geometry.vertexData(), stroker.vertices(),
+            stroker.vertexCount() * sizeof( float ) );
+
+        markDirty( QSGNode::DirtyGeometry );
+    }
+
+    const auto color = pen.color().toRgb();
+
+    if ( d->material.color() != color )
+    {
+        d->material.setColor( color );
+        markDirty( QSGNode::DirtyMaterial );
+    }
+}
diff --git a/src/nodes/QskStrokeNode.h b/src/nodes/QskStrokeNode.h
new file mode 100644
index 00000000..86984473
--- /dev/null
+++ b/src/nodes/QskStrokeNode.h
@@ -0,0 +1,28 @@
+/******************************************************************************
+ * QSkinny - Copyright (C) 2016 Uwe Rathmann
+ * This file may be used under the terms of the QSkinny License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QSK_STROKE_NODE_H
+#define QSK_STROKE_NODE_H
+
+#include "QskGlobal.h"
+#include <qsgnode.h>
+
+class QPen;
+class QPainterPath;
+
+class QskStrokeNodePrivate;
+
+class QSK_EXPORT QskStrokeNode : public QSGGeometryNode
+{
+  public:
+    QskStrokeNode();
+
+    void updateNode( const QPainterPath&, const QPen& );
+
+  private:
+    Q_DECLARE_PRIVATE( QskStrokeNode )
+};
+
+#endif
diff --git a/src/src.pro b/src/src.pro
index 959b2c36..d468fe27 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -111,6 +111,7 @@ HEADERS += \
     nodes/QskScaleRenderer.h \
     nodes/QskSGNode.h \
     nodes/QskShadedBoxNode.h \
+    nodes/QskStrokeNode.h \
     nodes/QskTextNode.h \
     nodes/QskTextRenderer.h \
     nodes/QskTextureRenderer.h \
@@ -133,6 +134,7 @@ SOURCES += \
     nodes/QskScaleRenderer.cpp \
     nodes/QskSGNode.cpp \
     nodes/QskShadedBoxNode.cpp \
+    nodes/QskStrokeNode.cpp \
     nodes/QskTextNode.cpp \
     nodes/QskTextRenderer.cpp \
     nodes/QskTextureRenderer.cpp \