@thi.ng/imago/layers/image.js

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

import { illegalArgs } from "@thi.ng/errors";
import sharp from "sharp";
import { computeSize, ensureSize, positionOrGravity } from "../utils.js";
const imageLayerImpl = async (layer, _, ctx) => {
  const {
    type: __,
    buffer,
    gravity,
    path,
    pos,
    ref,
    size,
    unit,
    ...opts
  } = layer;
  if (!(path || buffer)) illegalArgs("missing image source");
  const input = sharp(path || buffer);
  const meta = await input.metadata();
  let imgSize = [meta.width, meta.height];
  if (size) imgSize = computeSize(size, imgSize, ref, unit);
  const $pos = positionOrGravity(imgSize, ctx.size, layer);
  if (!size) return { input: path, ...$pos, ...opts };
  ensureSize(meta);
  const { data, info } = await input.resize(imgSize[0], imgSize[1], { fit: "fill" }).raw().toBuffer({ resolveWithObject: true });
  return {
    input: data,
    raw: {
      width: info.width,
      height: info.height,
      channels: info.channels
    },
    ...$pos,
    ...opts
  };
};
export {
  imageLayerImpl
};