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Raster tiles are always retained when raster-fade-duration is set to 0 #12241

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stepankuzmin opened this issue Sep 16, 2022 · 0 comments · May be fixed by #12684
Open

Raster tiles are always retained when raster-fade-duration is set to 0 #12241

stepankuzmin opened this issue Sep 16, 2022 · 0 comments · May be fixed by #12684
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@stepankuzmin
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stepankuzmin commented Sep 16, 2022 •
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GL JS always retains raster tiles if raster-fade-duration is set to 0.

Screen Shot 2022-09-16 at 13 30 47

It's most likely related to how we handle fading tiles in SourceCache.

mapbox-gl-js/src/source/source_cache.js

Lines 559 to 568 in bf9964e

if (!tile || (tile.fadeEndTime && tile.fadeEndTime <= browser.now())) continue;
// if the tile is loaded but still fading in, find parents to cross-fade with it
const parentTile = this.findLoadedParent(tileID, Math.max(tileID.overscaledZ - SourceCache.maxOverzooming, this._source.minzoom));
if (parentTile) {
this._addTile(parentTile.tileID);
parentsForFading[parentTile.tileID.key] = parentTile.tileID;
}
fadingTiles[id] = tileID;

Also related to #4034

Steps to Trigger Behavior

  1. Add raster source
  2. Set raster-fade-duration to 0
  3. Zoom out and see that children tiles are still retained

Link to Demonstration

https://codepen.io/stepankuzmin/pen/zYjNQWM

Expected Behavior

Parent tiles should replace children tiles

Actual Behavior

Children tiles are retained, parent tiles aren't drawn
@stepankuzmin stepankuzmin mentioned this issue Sep 16, 2022
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Don't retain children raster tiles when raster-fade-duration is set to 0 mapbox/mapbox-gl-js
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@stepankuzmin