Render a QML scene into a texture and save it

[stereoMatching]

How could I translate the QML scene(like Rectangle, Image etc) into a texture and save it?
Anyone tried this before?If I can translate the components to texture, then I should be able to save
the image after processing by particle systems or shaderEffects

[stereoMatching]

Example:


Rectangle{
id:root

widht:640
height: 480

ToTexture{ id: toTexture} //a new type created by c++

MouseArea{

anchors.fill: parent

onClicked: {
toTexture.saveAsTexture(root) //this function will transfer the root item to texture and save it into QImage
}
}
}


The problem is, how could I design a new type like “ToTexture”? The example of “ Scene Graph – OpenGL Under QML.” show us how to render a qml scene, but I can’t find an example show us how to transfer the qml scene to a texture.

[stereoMatching]

I found a way to do it

http://www.qtcentre.org/threads/54964-How-to-take-ScreenShot-Qt-QML

We could take the screenshot, then render the QImage to texture