voronoi-diagram: new op in workshop
Given a subset of the input referred to as the "seed", the gegl:voronoi-diagram op paints each non-seed pixel with the color of the nearest seed pixel, using one of several metrics. The non- seeded region is identified either through a special color in the input, or using an AUX input. The resulting output is, essentialy, the Voronoi diagram of the input.
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