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German KhokhlovandClaude Fable 5.1
e214129e45
- No pointer cursor over coverage lines (no other layer has one); a click test replaces the hover tests. - No legend: one source, one colour. - The on-globe credit lives in index.js; credits.js is gone. - Billboard glyphs are SVG data URLs with the same geometry, so tests need no canvas stub. - The tile cache keeps the 120 most recently used tiles, same 24 h TTL, instead of a byte budget; listTileLayers was test-only. - providers/mapillary/ is flattened into the layer and its policy merged into one policy.js; the source's method list is a literal in the catalog. - One fakeCesiumViewer for the layer tests. - The fixture gate keeps the steps the unit tests do not cover: coverage and credit, a rejected key, line -> cone -> photo, close, a keyless page. Co-Authored-By: Claude Fable 5.1 <[email protected]>
44 lines
1.4 KiB
JavaScript
44 lines
1.4 KiB
JavaScript
import { PbfReader, PbfWriter } from 'pbf';
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/** Field number of `layers` in a Mapbox Vector Tile, and of `name` in a layer. */
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const TILE_LAYER_FIELD = 3;
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const LAYER_NAME_FIELD = 1;
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/** Read a layer's name without touching its features. */
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function layerName(layerBytes) {
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const pbf = new PbfReader(layerBytes);
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let name = '';
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pbf.readFields((tag, _result, reader) => {
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if (tag !== LAYER_NAME_FIELD) return;
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name = reader.readString();
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reader.pos = reader.length; // the name is all we need
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}, null);
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return name;
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}
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/**
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* Drop whole layers from a vector tile without decoding kept layers, so a
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* 12 MB tile trims in milliseconds. Returns the input when nothing was dropped.
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* @param {Buffer|Uint8Array} bytes
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* @param {Iterable<string>} dropNames
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*/
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export function stripTileLayers(bytes, dropNames) {
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const drop = new Set(dropNames || []);
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if (!bytes?.length || !drop.size) return bytes;
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const reader = new PbfReader(bytes);
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const writer = new PbfWriter();
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let dropped = false;
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reader.readFields((tag, _result, pbf) => {
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if (tag !== TILE_LAYER_FIELD) return;
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const end = pbf.readVarint() + pbf.pos;
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const layerBytes = bytes.subarray(pbf.pos, end);
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pbf.pos = end;
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if (drop.has(layerName(layerBytes))) {
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dropped = true;
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return;
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}
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writer.writeBytesField(TILE_LAYER_FIELD, layerBytes);
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}, null);
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return dropped ? Buffer.from(writer.finish()) : bytes;
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}
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