OpenVG: Support rendering paths with non-affine transforms

The current approach to rendering paths (used by Rectangles and Glyph
nodes) does not support rendering with non-affine transformations.  That
is because OpenVG does not support passing a non-affine transformation
matrix when rendering paths.  So instead when using a non-affine
transform we will fallback to rendering to an offscreen VGImage, then
rendering that as an image which can have a perspective transform.

Change-Id: I01508bcb67b339323cb6400c7ff6d885b62c5e02
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 1 insertions, 13 deletions

diff --git a/src/plugins/scenegraph/openvg/qsgopenvgnodevisitor.h b/src/plugins/scenegraph/openvg/qsgopenvgnodevisitor.h
index 3105f2076d..4805d63024 100644
--- a/src/plugins/scenegraph/openvg/qsgopenvgnodevisitor.h
+++ b/src/plugins/scenegraph/openvg/qsgopenvgnodevisitor.h
@@ -79,24 +79,12 @@ public:
     void endVisit(QSGRenderNode *) override;
 
 private:
-    struct ClipState {
-        ClipState(VGPath p, QOpenVGMatrix t)
-        {
-            path = p;
-            transform = t;
-        }
-
-        VGPath path;
-        QOpenVGMatrix transform;
-    };
-
     VGPath generateClipPath(const QRectF &rect) const;
     void renderRenderableNode(QSGOpenVGRenderable *node);
 
-
     QStack<QOpenVGMatrix> m_transformStack;
     QStack<float> m_opacityState;
-    QStack<ClipState*> m_clipStack;
+    QStack<VGPath> m_clipStack;
 };
 
 QT_END_NAMESPACE