feat: port OutlinedPathLayer from ubilabs/outlined-path-layer

[Copilot]

Ports @ubilabs/outlined-path-layer into @deck.gl-community/layers.

Screen.Recording.2026-02-15.at.11.44.11.PM.mov

Changes

• modules/layers/src/outlined-path-layer/ — new layer directory with:
  • outlined-path-layer.ts — extends PathLayer, adds instanced outline color/width attributes
  • outlined-path-layer-vertex.glsl.ts — computes inner vs outline geometry via width ratio
  • outlined-path-layer-fragment.glsl.ts — branchless inner/outline coloring
  • outlined-path-uniforms.ts — uniform block for outline width units/min/max
• modules/layers/src/index.ts — exports OutlinedPathLayer and OutlinedPathLayerProps

Usage

import {OutlinedPathLayer} from '@deck.gl-community/layers';

new OutlinedPathLayer({
  id: 'paths',
  data,
  getPath: d => d.path,
  getColor: [255, 0, 0],
  getWidth: 5,
  getOutlineColor: [0, 0, 0, 255],
  getOutlineWidth: 2,
  outlineWidthUnits: 'pixels',
});

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[ibgreen]

From the repo

we are not planning further development. Our goal is to support the integration of outline functionality directly into deck.gl.

Moving this to deck.gl-community would be a good first step towards this goal.

[pappkartoni]

Thank you very much for porting this!
Looks good to me.

I agree this serves as a good first step to hopefully integrate this into base deck.gl at some point.

If I decide to make changes / add features I plan on doing so in the original repo so there might arise the need to update this here as well, just wanted to mention this.

Cheers

[charlieforward9]

Inline with the discussion in #495

openjs-foundation/open-visualization#43 supercedes this