Function extract_mbr 

pub fn extract_mbr(blob: &[u8]) -> Result<Option<Rect<f64>>>

Compute the planar minimum bounding rectangle of an EWKB blob without allocating a Geometry enum.

Walks the EWKB byte payload, reads only the X/Y coordinates, and tracks running min/max. For the “many points vs one window” filter shape this is roughly 10-100x cheaper per call than parse_ewkb(...).bounding_rect() because it skips the heap-allocating decode entirely.

Returns Ok(None) when the geometry is empty (empty Point with NaN coordinates, empty LineString, empty Polygon, or any container whose elements are all empty). Returns Err only for malformed blobs.

Example

use sqlitegis::core::ewkb::extract_mbr;
use sqlitegis::core::functions::io::geom_from_text;

let blob = geom_from_text("POLYGON((0 0, 10 0, 10 5, 0 5, 0 0))", None).unwrap();
let mbr = extract_mbr(&blob).unwrap().unwrap();
assert_eq!(mbr.min().x, 0.0);
assert_eq!(mbr.min().y, 0.0);
assert_eq!(mbr.max().x, 10.0);
assert_eq!(mbr.max().y, 5.0);

let empty = geom_from_text("POINT EMPTY", None).unwrap();
assert!(extract_mbr(&empty).unwrap().is_none());