latkit 0.2.0

Columnar data drawn as vertices, edges, lines, and areas on the GPU.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

//! Geography: GeoJSON and vector tiles as data, and what shapes become to draw: an
//! area's triangles, and lines bent along the globe.

#[cfg(feature = "gpu")]
mod earcut;
mod geojson;
#[cfg(feature = "gpu")]
pub(crate) mod mvt;
#[cfg(feature = "gpu")]
pub(crate) mod pmtiles;
#[cfg(feature = "gpu")]
pub(crate) mod shapes;
#[cfg(feature = "gpu")]
pub(crate) mod tiles;

use std::borrow::Cow;
use std::io::Read;

pub(crate) use geojson::geojson;

use crate::{Error, Result};

/// `bytes` inflated where they are gzip-compressed, else as they are.
pub(crate) fn gunzipped(bytes: &[u8]) -> Result<Cow<'_, [u8]>> {
    if !bytes.starts_with(&[0x1f, 0x8b]) {
        return Ok(Cow::Borrowed(bytes));
    }
    let mut out = Vec::with_capacity(bytes.len() * 4);
    flate2::read::MultiGzDecoder::new(bytes)
        .read_to_end(&mut out)
        .map_err(|e| Error::invalid(format!("the gzip-compressed bytes are corrupt: {e}")))?;
    Ok(Cow::Owned(out))
}