> Using ShaderEffectSource or "Item.layer: true" does mean going through an
> FBO. Using ShaderEffect alone or with a plain Image element can be almost
> the same as using a plain Image element. I say "can" as the content of the
> shader greatly impacts the resulting performance.
>
> If you do:
>
> Image {
> id: theIcon
> source: "myIcon.png"
> visible: false
> }
>
> ShaderEffect {
> propery variant source: theIcon
> width: theIcon.width
> height: theIcon.height
>
> fragmentShader: "...."
> }
>
> There is no FBO involved and the performance will be close to that of
> rendering a normal Image. Image elements can be used directly as texture
> sources, you see. In fact any, QQuickItem that implements the
> QSGTextureProvider interface can be used directly as a texture in a shader
> effect. It is also possible to use ShaderEffect without textures, for
> instance to render a gradient.
>
This is great to hear... I took a look through QQuickImage and didn't
think it was exactly trivial to subclass -- there's quite a bit of code and
functionality for it. Thanks to both for the feedback!
Preet
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