@thi.ng/imago/ops/composite.js

JSON & API-based declarative and extensible image processing trees/pipelines

import { defmulti } from "@thi.ng/defmulti";
import { colorLayerImpl } from "../layers/color.js";
import { imageLayerImpl } from "../layers/image.js";
import { rawLayerImpl } from "../layers/raw.js";
import { svgLayerImpl } from "../layers/svg.js";
import { textLayerImpl } from "../layers/text.js";
const compositeProc = async (spec, input, ctx) => {
  const { layers } = spec;
  const layerSpecs = await Promise.all(
    layers.map((l) => defLayer(l, input, ctx))
  );
  ctx.logger.debug("layer specs", layerSpecs);
  return [input.composite(layerSpecs), true];
};
const defLayer = defmulti(
  (x) => x.type,
  {},
  {
    color: colorLayerImpl,
    img: imageLayerImpl,
    raw: rawLayerImpl,
    svg: svgLayerImpl,
    text: textLayerImpl
  }
);
export {
  compositeProc,
  defLayer
};