MVT encoding (or decoding) issue

[grim7reaper]

Seems like in some cases geozero cannot read the MVT it generated.

Simple example:

#[test]
fn render_rect() {
    let shape = Rect::new(Coord { x: 0., y: 0. }, Coord { x: 1., y: 1. });
    let feature = Geometry::Rect(shape).to_mvt_unscaled().expect("mvt");
    let mut writer = GeoWriter::new();
    geozero::mvt::process_geom(&feature, &mut writer).expect("read MVT");
}

Dunno if the issue is in the encoder or the decoder.

Or maybe I'm doing something wrong?

[pka]

Code looks legit at a first glance. What's the error message?

[grim7reaper]

Error I get is:

MvtError(GeometryFormat)

I tried to debug it a bit and it's coming from here.

My guess is that we somehow detect an interior ring (negative area) but since there is no outer ring to which it could belong we get the error.

So maybe a problem at write time?