[PyQt] [Regression] QSGGeometry crash with PyQt 5.5

[Phil Thompson]

On 24/07/2015 4:45 pm, Arjen Hiemstra wrote:
> Hi,
> 
> Using PyQt 5.4 the following code (from a custom QQuickItem) works:
> 
>     def updatePaintNode(self, paint_node, update_data):
>             self._node = QSGGeometryNode()
> 
>             self._geometry =
> QSGGeometry(QSGGeometry.defaultAttributes_Point2D(), 6, 12)
>             self._geometry.setDrawingMode(0x0004)
>             
> self._geometry.vertexDataAsPoint2D()[0].set(self._corner_size, 0)
>             self._geometry.vertexDataAsPoint2D()[1].set(0, 
> self._corner_size)
>             self._geometry.vertexDataAsPoint2D()[2].set(0, 
> self.height())
>             self._geometry.vertexDataAsPoint2D()[3].set(self.width() -
> self._corner_size, self.height())
>             self._geometry.vertexDataAsPoint2D()[4].set(self.width(),
> self.height() - self._corner_size)
>             self._geometry.vertexDataAsPoint2D()[5].set(self.width(), 
> 0)
> 
>             self._geometry.indexDataAsUShort()[0] = 0
>             self._geometry.indexDataAsUShort()[1] = 1
>             self._geometry.indexDataAsUShort()[2] = 2
> 
>             self._geometry.indexDataAsUShort()[3] = 0
>             self._geometry.indexDataAsUShort()[4] = 2
>             self._geometry.indexDataAsUShort()[5] = 3
> 
>             self._geometry.indexDataAsUShort()[6] = 0
>             self._geometry.indexDataAsUShort()[7] = 3
>             self._geometry.indexDataAsUShort()[8] = 4
> 
>             self._geometry.indexDataAsUShort()[9] = 0
>             self._geometry.indexDataAsUShort()[10] = 4
>             self._geometry.indexDataAsUShort()[11] = 5
> 
>             self._node.setGeometry(self._geometry)
> 
>             self._material = QSGFlatColorMaterial()
>             self._material.setColor(self._color)
> 
>             self._node.setMaterial(self._material)
> 
>             return self._node
> 
> Using PyQt5.5 the same code crashes. As far as I can tell, this is a
> regression from PyQt5.4, unless I am doing something terribly wrong.

> 
> With some testing, it seems something is going wrong with
> QSGGeometry.defaultAttributes_Point2D() since removing that call and
> passing None to the QSGGeometry constructor will make things work (but
> no custom geometry shows up of course).
> 
> Please let me know if you need any additional information.

Have you got a short, complete script I can run the reproduce the 
problem?

Phil