From a35cc9936a1b8f19be617daa1e4f778a05aaaa65 Mon Sep 17 00:00:00 2001
From: Uwe Rathmann <Uwe.Rathmann@tigertal.de>
Date: Wed, 1 Jun 2022 18:27:05 +0200
Subject: [PATCH] mirroring added

---
 src/nodes/QskPaintedNode.cpp | 45 ++++++++++++++++++++++++++++++++----
 src/nodes/QskPaintedNode.h   |  4 ++++
 2 files changed, 45 insertions(+), 4 deletions(-)

diff --git a/src/nodes/QskPaintedNode.cpp b/src/nodes/QskPaintedNode.cpp
index e153b2bb..8f505caf 100644
--- a/src/nodes/QskPaintedNode.cpp
+++ b/src/nodes/QskPaintedNode.cpp
@@ -64,6 +64,20 @@ static GLuint qskTakeTexture( QOpenGLFramebufferObject& fbo )
     return textureId;
 }
 
+static inline QSGImageNode::TextureCoordinatesTransformMode
+    qskEffectiveTransformMode( const Qt::Orientations mirrored )
+{
+    QSGImageNode::TextureCoordinatesTransformMode mode;
+
+    if ( mirrored & Qt::Vertical )
+        mode |= QSGImageNode::MirrorVertically;
+
+    if ( mirrored & Qt::Horizontal )
+        mode |= QSGImageNode::MirrorHorizontally;
+
+    return mode;
+}
+
 namespace
 {
     const quint8 imageRole = 250; // reserved for internal use
@@ -104,6 +118,25 @@ QskPaintedNode::RenderHint QskPaintedNode::renderHint() const
     return m_renderHint;
 }
 
+void QskPaintedNode::setMirrored( Qt::Orientations orientations )
+{
+    if ( orientations != m_mirrored )
+    {
+        m_mirrored == orientations;
+
+        if ( auto imageNode = findImageNode( this ) )
+        {
+            imageNode->setTextureCoordinatesTransform(
+                qskEffectiveTransformMode( orientations ) );
+        }
+    }
+}
+
+Qt::Orientations QskPaintedNode::mirrored() const
+{
+    return m_mirrored;
+}
+
 QRectF QskPaintedNode::rect() const
 {
     const auto imageNode = findImageNode( this );
@@ -145,6 +178,14 @@ void QskPaintedNode::update( QQuickWindow* window,
         else
             updateImageNode( window, rect, nodeData );
     }
+
+    imageNode = findImageNode( this );
+    if ( imageNode )
+    {
+        imageNode->setRect( rect );
+        imageNode->setTextureCoordinatesTransform(
+            qskEffectiveTransformMode( m_mirrored ) );
+    }
 }
 
 void QskPaintedNode::updateImageNode(
@@ -183,8 +224,6 @@ void QskPaintedNode::updateImageNode(
         texture->setImage( image );
     else
         imageNode->setTexture( window->createTextureFromImage( image ) );
-
-    imageNode->setRect( rect );
 }
 
 void QskPaintedNode::updateImageNodeGL(
@@ -240,8 +279,6 @@ void QskPaintedNode::updateImageNodeGL(
         texture->setTextureSize( size );
     }
 #endif
-
-    imageNode->setRect( rect );
 }
 
 uint32_t QskPaintedNode::createTexture(
diff --git a/src/nodes/QskPaintedNode.h b/src/nodes/QskPaintedNode.h
index 5ae43ec3..755b8dac 100644
--- a/src/nodes/QskPaintedNode.h
+++ b/src/nodes/QskPaintedNode.h
@@ -38,6 +38,9 @@ class QSK_EXPORT QskPaintedNode : public QSGNode
     void setRenderHint( RenderHint );
     RenderHint renderHint() const;
 
+    void setMirrored( Qt::Orientations );
+    Qt::Orientations mirrored() const;
+
     QRectF rect() const;
 
   protected:
@@ -55,6 +58,7 @@ class QSK_EXPORT QskPaintedNode : public QSGNode
     uint32_t createTexture( QQuickWindow*, const QSize&, const void* nodeData );
 
     RenderHint m_renderHint = OpenGL;
+    Qt::Orientations m_mirrored;
     QskHashValue m_hash = 0;
 };