From fcbefee383ccff2a6485acc120631123e30b41dd Mon Sep 17 00:00:00 2001
From: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
Date: Fri, 19 Jun 2015 12:19:06 +0200
Subject: Add a property to enable vertical mirroring in
 QQuickFramebufferObject

[ChangeLog] Added a mirrorVertically property to QQuickFramebufferObject.

Task-number: QTBUG-41073
Change-Id: Ib69cbfe7b2f6ae42913d857460431195ff92e53a
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
---
 src/quick/items/qquickframebufferobject.cpp | 31 +++++++++++++++++++++++++++++
 src/quick/items/qquickframebufferobject.h   |  5 +++++
 2 files changed, 36 insertions(+)

diff --git a/src/quick/items/qquickframebufferobject.cpp b/src/quick/items/qquickframebufferobject.cpp
index c3e5b97baf..18e786fea4 100644
--- a/src/quick/items/qquickframebufferobject.cpp
+++ b/src/quick/items/qquickframebufferobject.cpp
@@ -47,11 +47,13 @@ class QQuickFramebufferObjectPrivate : public QQuickItemPrivate
 public:
     QQuickFramebufferObjectPrivate()
         : followsItemSize(true)
+        , mirrorVertically(false)
         , node(0)
     {
     }
 
     bool followsItemSize;
+    bool mirrorVertically;
     mutable QSGFramebufferObjectNode *node;
 };
 
@@ -137,6 +139,34 @@ bool QQuickFramebufferObject::textureFollowsItemSize() const
     return d->followsItemSize;
 }
 
+/*!
+ * \property QQuickFramebufferObject::mirrorVertically
+ *
+ * This property controls if the size of the FBO's contents should be mirrored
+ * vertically when drawing. This allows easy integration of third-party
+ * rendering code that does not follow the standard expectations.
+ *
+ * The default value is \c {false}.
+ *
+ * \since 5.6
+ */
+
+void QQuickFramebufferObject::setMirrorVertically(bool enable)
+{
+    Q_D(QQuickFramebufferObject);
+    if (d->mirrorVertically == enable)
+        return;
+    d->mirrorVertically = enable;
+    emit mirrorVerticallyChanged(d->mirrorVertically);
+    update();
+}
+
+bool QQuickFramebufferObject::mirrorVertically() const
+{
+    Q_D(const QQuickFramebufferObject);
+    return d->mirrorVertically;
+}
+
 /*!
  * \internal
  */
@@ -290,6 +320,7 @@ QSGNode *QQuickFramebufferObject::updatePaintNode(QSGNode *node, UpdatePaintNode
                                                     QQuickWindow::TextureHasAlphaChannel));
     }
 
+    n->setTextureCoordinatesTransform(d->mirrorVertically ? QSGSimpleTextureNode::MirrorVertically : QSGSimpleTextureNode::NoTransform);
     n->setFiltering(d->smooth ? QSGTexture::Linear : QSGTexture::Nearest);
     n->setRect(0, 0, width(), height());
 
diff --git a/src/quick/items/qquickframebufferobject.h b/src/quick/items/qquickframebufferobject.h
index 4a0248c082..7fb7262222 100644
--- a/src/quick/items/qquickframebufferobject.h
+++ b/src/quick/items/qquickframebufferobject.h
@@ -49,6 +49,7 @@ class Q_QUICK_EXPORT QQuickFramebufferObject : public QQuickItem
     Q_DECLARE_PRIVATE(QQuickFramebufferObject)
 
     Q_PROPERTY(bool textureFollowsItemSize READ textureFollowsItemSize WRITE setTextureFollowsItemSize NOTIFY textureFollowsItemSizeChanged)
+    Q_PROPERTY(bool mirrorVertically READ mirrorVertically WRITE setMirrorVertically NOTIFY mirrorVerticallyChanged)
 
 public:
 
@@ -73,6 +74,9 @@ public:
     bool textureFollowsItemSize() const;
     void setTextureFollowsItemSize(bool follows);
 
+    bool mirrorVertically() const;
+    void setMirrorVertically(bool enable);
+
     virtual Renderer *createRenderer() const = 0;
 
     bool isTextureProvider() const Q_DECL_OVERRIDE;
@@ -87,6 +91,7 @@ protected:
 
 Q_SIGNALS:
     void textureFollowsItemSizeChanged(bool);
+    void mirrorVerticallyChanged(bool);
 
 private Q_SLOTS:
     void invalidateSceneGraph();
-- 
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