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

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

import { isNumber } from "@thi.ng/checks";
import { resizeProc } from "./resize.js";
const maxsizeProc = async (spec, input, ctx) => {
  const { maxSize } = spec;
  const [width, height] = ctx.size;
  const result = [input, false];
  if (isNumber(maxSize)) {
    if (width > maxSize || height > maxSize)
      return resizeProc(
        { ...spec, size: maxSize, unit: "px" },
        input,
        ctx
      );
  } else {
    const [maxW, maxH] = maxSize;
    const resizeWidth = maxW > 0 && width > maxW;
    const resizeHeight = maxH > 0 && height > maxH;
    const specW = { ...spec, size: [maxW, -1], unit: "px" };
    const specH = { ...specW, size: [-1, maxH] };
    if (width >= height) {
      return resizeWidth ? resizeProc(specW, input, ctx) : resizeHeight ? resizeProc(specH, input, ctx) : result;
    } else {
      return resizeHeight ? resizeProc(specH, input, ctx) : resizeWidth ? resizeProc(specW, input, ctx) : result;
    }
  }
  return result;
};
export {
  maxsizeProc
};