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Viewing file:     index.js (1.59 KB)      -rw-r--r--

import BMP from "bmp-js";
import { scan } from "@jimp/utils";

const MIME_TYPE = "image/bmp";
const MIME_TYPE_SECOND = "image/x-ms-bmp";

function toAGBR(image) {
  return scan(
    image,
    0,
    0,
    image.bitmap.width,
    image.bitmap.height,
    function (x, y, index) {
      const red = this.bitmap.data[index + 0];
      const green = this.bitmap.data[index + 1];
      const blue = this.bitmap.data[index + 2];
      const alpha = this.bitmap.data[index + 3];

      this.bitmap.data[index + 0] = alpha;
      this.bitmap.data[index + 1] = blue;
      this.bitmap.data[index + 2] = green;
      this.bitmap.data[index + 3] = red;
    }
  ).bitmap;
}

function fromAGBR(bitmap) {
  return scan(
    { bitmap },
    0,
    0,
    bitmap.width,
    bitmap.height,
    function (x, y, index) {
      const alpha = this.bitmap.data[index + 0];
      const blue = this.bitmap.data[index + 1];
      const green = this.bitmap.data[index + 2];
      const red = this.bitmap.data[index + 3];

      this.bitmap.data[index + 0] = red;
      this.bitmap.data[index + 1] = green;
      this.bitmap.data[index + 2] = blue;
      this.bitmap.data[index + 3] = bitmap.is_with_alpha ? alpha : 0xff;
    }
  ).bitmap;
}

const decode = (data) => fromAGBR(BMP.decode(data));
const encode = (image) => BMP.encode(toAGBR(image)).data;

export default () => ({
  mime: { [MIME_TYPE]: ["bmp"] },

  constants: {
    MIME_BMP: MIME_TYPE,
    MIME_X_MS_BMP: MIME_TYPE_SECOND,
  },

  decoders: {
    [MIME_TYPE]: decode,
    [MIME_TYPE_SECOND]: decode,
  },

  encoders: {
    [MIME_TYPE]: encode,
    [MIME_TYPE_SECOND]: encode,
  },
});