Fix pixel bleed in BorderImage

Keeping all patches of the border image in the same texture
with different sample points can cause parts of the border
to bleed over to the center patch. To rectify this, we
create a separate texture for each of the nine patches we
need, and separate image nodes.

To avoid applying antialiasing on the interior edges of the
border image, we introduce new antialiasing flags which can
be used to specify precisely which edges of the image should
be antialiased.

[ChangeLog][BorderImage] Fixed possible pixel bleed between
border patches and center patch in BorderImage.

Change-Id: Icc292b3969217320eecca99e79675316c42eab08
Task-number: QTBUG-35838
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/quick/scenegraph/qsgdefaultimagenode_p.h b/src/quick/scenegraph/qsgdefaultimagenode_p.h
index 26b087284b..558e4d8ba4 100644
--- a/src/quick/scenegraph/qsgdefaultimagenode_p.h
+++ b/src/quick/scenegraph/qsgdefaultimagenode_p.h
@@ -62,6 +62,7 @@ public:
     virtual void setSubSourceRect(const QRectF &rect);
     virtual void setTexture(QSGTexture *t);
     virtual void setAntialiasing(bool antialiasing);
+    virtual void setAntialiasing(AntialiasingFlags antialiasing);
     virtual void setMirror(bool mirror);
     virtual void update();
 
@@ -84,11 +85,11 @@ private:
     QSGTextureMaterial m_materialO;
     QSGSmoothTextureMaterial m_smoothMaterial;
 
-    uint m_antialiasing : 1;
     uint m_mirror : 1;
     uint m_dirtyGeometry : 1;
 
     QSGGeometry m_geometry;
+    AntialiasingFlags m_antialiasing;
 };
 
 QT_END_NAMESPACE