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Fix raster-dem glitches for "no content" tiles (status 204) #5392

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Fix raster-dem glitches for "no content" tiles (status 204) #5392

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5 changes: 5 additions & 0 deletions src/source/raster_dem_tile_worker_source.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import {DEMData} from '../data/dem_data';
import {RGBAImage} from '../util/image';
import type {Actor} from '../util/actor';
import {AJAXError} from '../util/ajax';
import type {
WorkerDEMTileParameters,
TileParameters
Expand All @@ -17,6 +18,10 @@

async loadTile(params: WorkerDEMTileParameters): Promise<DEMData | null> {
const {uid, encoding, rawImageData, redFactor, greenFactor, blueFactor, baseShift} = params;
if (rawImageData.width === 1) {
// 1x1 images should not be loaded. They are meant to cache tiles without content (204).
throw new AJAXError(404, 'not found', '', new Blob());
}

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src/source/raster_dem_tile_worker_source.ts#L23-L24 

Added lines #L23 - L24 were not covered by tests
const width = rawImageData.width + 2;
const height = rawImageData.height + 2;
const imagePixels: RGBAImage | ImageData = isImageBitmap(rawImageData) ?
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