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, 4 insertions, 0 deletions

diff --git a/src/plugins/scenegraph/openvg/qsgopenvginternalrectanglenode.h b/src/plugins/scenegraph/openvg/qsgopenvginternalrectanglenode.h
index 0d5283773f..e8d25c94f8 100644
--- a/src/plugins/scenegraph/openvg/qsgopenvginternalrectanglenode.h
+++ b/src/plugins/scenegraph/openvg/qsgopenvginternalrectanglenode.h
@@ -42,6 +42,7 @@
 
 #include <private/qsgadaptationlayer_p.h>
 #include "qsgopenvgrenderable.h"
+#include "qopenvgoffscreensurface.h"
 
 #include <VG/openvg.h>
 
@@ -64,6 +65,7 @@ public:
 
     void render() override;
     void setOpacity(float opacity) override;
+    void setTransform(const QOpenVGMatrix &transform) override;
 
 private:
     void createVGResources();
@@ -89,6 +91,8 @@ private:
     VGPath m_borderPath;
     VGPaint m_rectanglePaint;
     VGPaint m_borderPaint;
+
+    QOpenVGOffscreenSurface *m_offscreenSurface = nullptr;
 };
 
 QT_END_NAMESPACE