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

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

import { isNumber } from "@thi.ng/checks";
import { GRAVITY_POSITION } from "../api.js";
import { coerceColor, computeSize } from "../utils.js";
const resizeProc = async (spec, input, ctx) => {
  const { bg, filter, fit, gravity, ref, size, unit } = spec;
  const aspect = ctx.size[0] / ctx.size[1];
  let $size = size;
  let width, height;
  if (isNumber($size) && unit !== "%") {
    $size = aspect > 1 ? [$size, $size / aspect] : [$size * aspect, $size];
  }
  [width, height] = computeSize($size, ctx.size, ref, unit);
  return [
    input.resize({
      width,
      height,
      fit,
      kernel: filter,
      position: gravity ? GRAVITY_POSITION[gravity] : void 0,
      background: bg ? coerceColor(bg) : void 0
    }),
    true
  ];
};
export {
  resizeProc
};