Render a QML scene into a texture and save it

Question

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

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)
     }
  }
}

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.

Without this function, I can't save the graph generated QtQuick

With "the QML scene" do you literally mean an entire QML scene? In QtQuick2 that's trivial with QQuickWindow::setRenderTarget, and I pretty much guess it's the same in QQ1 by QDeclarativeView::render onto a QImage... — peppe, Jun 13 '13 at 07:07
Precisely, I want to do what shaderEffectSource do, render Rectangle, Image and other components to texture and get the pointer of those texture, save the texture by QImage. — StereoMatching, Jun 13 '13 at 09:48
Any example? I found one called OpenGL Under QML，show us how to render the qml scene, but there are no example show us how to translate the qml scene into a texture and save it.In QtQuick2, we can't even simply transfer the Image to QImage and save it like QQ1 did. — StereoMatching, Jun 13 '13 at 09:54
http://stackoverflow.com/questions/16792634/how-to-printwith-the-printer-a-qml-object/16793242#16793242 — dtech, Jun 13 '13 at 16:18
Thanks, ddriver, do you know how to extract the the raw framebuffer data of the visible qml component now?I would like to record the scene as video, but can't find a way to do so, grabWindow() is too slow for video — StereoMatching, Jun 14 '13 at 06:27

score 0 · Answer 1 · edited May 23 '17 at 10:32

0

I found another solution, on this post

take screenshot

We could take the screenshot of the qml scene, then we could do anything to it, include render it to texture

edited May 23 '17 at 10:32

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answered Jun 13 '13 at 15:58

StereoMatching

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Render a QML scene into a texture and save it

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