Divides the viewport's effective resolution by this value while preserving its scale. This can be used to speed up rendering.
For example, a 1280×720 viewport with [member stretch_shrink] set to [code]2[/code] will be rendered at 640×360 while occupying the same size in the container.
[b]Note:[/b] [member stretch] must be [code]true[/code] for this property to work.