Fabio/tileserver-gl
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chore: try to explain the zoom=0 special case

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Signed-off-by: Martin d'Allens <martin.dallens@liberty-rider.com>
This commit is contained in:
Martin d'Allens 2023-11-21 22:26:30 +01:00
parent 40ade063f9
commit c638a7c449
1 changed files with 4 additions and 3 deletions
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7
src/serve_rendered.js
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@ -413,9 +413,8 @@ const respondImage = (
pool = item.map.renderersStatic[scale];
}
pool.acquire((err, renderer) => {
const mlglZ = Math.max(0, z - 1);
const params = {
zoom: mlglZ,
zoom: z - 1, // Maplibre-native zoom 0 corresponds to our zoom 1.
center: [lon, lat],
bearing,
pitch,
@ -424,6 +423,8 @@ const respondImage = (
};
if (z === 0) {
// params.zoom equals -1
params.zoom = 0;
params.width *= 2;
params.height *= 2;
}
@ -464,7 +465,7 @@ const respondImage = (
}
if (z === 0) {
// HACK: when serving zoom 0, resize the 0 tile from 512 to 256
// HACK: when serving zoom 0 (unsupported by Maplibre-native), generate at zoom 1 then downsize.
image.resize(width * scale, height * scale);
}