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Enhance getVisibleCoordinates performance #7956

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Enhance getVisibleCoordinates performance #7956

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9 changes: 7 additions & 2 deletions src/source/source_cache.js
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Original file line number Diff line number Diff line change
Expand Up @@ -797,10 +797,15 @@ class SourceCache extends Evented {
}

getVisibleCoordinates(symbolLayer?: boolean): Array<OverscaledTileID> {
const coords = this.getRenderableIds(symbolLayer).map((id) => this._tiles[id].tileID);
for (const coord of coords) {
const renderableIds = this.getRenderableIds(symbolLayer);
const coords = new Array(renderableIds.length);

for (let i = 0; i < renderableIds.length; i++) {
const id = renderableIds[i];
const coord = coords[i] = this._tiles[id].tileID;
coord.posMatrix = this.transform.calculatePosMatrix(coord.toUnwrapped());
}

return coords;
}

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