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Viewing file:     index.js (2.44 KB)      -rw-r--r--

import { throwError, isNodePattern } from "@jimp/utils";

import Resize from "./modules/resize";
import Resize2 from "./modules/resize2";

export default () => ({
  constants: {
    RESIZE_NEAREST_NEIGHBOR: "nearestNeighbor",
    RESIZE_BILINEAR: "bilinearInterpolation",
    RESIZE_BICUBIC: "bicubicInterpolation",
    RESIZE_HERMITE: "hermiteInterpolation",
    RESIZE_BEZIER: "bezierInterpolation",
  },

  class: {
    /**
     * Resizes the image to a set width and height using a 2-pass bilinear algorithm
     * @param {number} w the width to resize the image to (or Jimp.AUTO)
     * @param {number} h the height to resize the image to (or Jimp.AUTO)
     * @param {string} mode (optional) a scaling method (e.g. Jimp.RESIZE_BEZIER)
     * @param {function(Error, Jimp)} cb (optional) a callback for when complete
     * @returns {Jimp} this for chaining of methods
     */
    resize(w, h, mode, cb) {
      if (typeof w !== "number" || typeof h !== "number") {
        return throwError.call(this, "w and h must be numbers", cb);
      }

      if (typeof mode === "function" && typeof cb === "undefined") {
        cb = mode;
        mode = null;
      }

      if (w === this.constructor.AUTO && h === this.constructor.AUTO) {
        return throwError.call(this, "w and h cannot both be set to auto", cb);
      }

      if (w === this.constructor.AUTO) {
        w = this.bitmap.width * (h / this.bitmap.height);
      }

      if (h === this.constructor.AUTO) {
        h = this.bitmap.height * (w / this.bitmap.width);
      }

      if (w < 0 || h < 0) {
        return throwError.call(this, "w and h must be positive numbers", cb);
      }

      // round inputs
      w = Math.round(w) || 1;
      h = Math.round(h) || 1;

      if (typeof Resize2[mode] === "function") {
        const dst = {
          data: Buffer.alloc(w * h * 4),
          width: w,
          height: h,
        };
        Resize2[mode](this.bitmap, dst);
        this.bitmap = dst;
      } else {
        const image = this;
        const resize = new Resize(
          this.bitmap.width,
          this.bitmap.height,
          w,
          h,
          true,
          true,
          (buffer) => {
            image.bitmap.data = Buffer.from(buffer);
            image.bitmap.width = w;
            image.bitmap.height = h;
          }
        );
        resize.resize(this.bitmap.data);
      }

      if (isNodePattern(cb)) {
        cb.call(this, null, this);
      }

      return this;
    },
  },
});