compute_concrete_size

Description:

public void compute_concrete_size (double specified_width, double specified_height, double default_width, double default_height, out double concrete_width, out double concrete_height)

Compute a concrete size for the `GdkPaintable`.

Applies the sizing algorithm outlined in the [CSS Image spec](https://drafts.csswg.org/css-images-3/default-sizing) to the given this. See that link for more details.

It is not necessary to call this function when both specified_width and specified_height are known, but it is useful to call this function in GtkWidget:measure implementations to compute the other dimension when only one dimension is given.

Parameters:

this	a `GdkPaintable`
specified_width	the width this could be drawn into or 0.0 if unknown
specified_height	the height this could be drawn into or 0.0 if unknown
default_width	the width this would be drawn into if no other constraints were given
default_height	the height this would be drawn into if no other constraints were given
concrete_width	will be set to the concrete width computed
concrete_height	will be set to the concrete height computed