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Viewing file:     index.js (1.97 KB)      -rw-r--r--

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _utils = require("@jimp/utils");
/**
 * Masks a source image on to this image using average pixel colour. A completely black pixel on the mask will turn a pixel in the image completely transparent.
 * @param {Jimp} src the source Jimp instance
 * @param {number} x the horizontal position to blit the image
 * @param {number} y the vertical position to blit the image
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */
var _default = () => ({
  mask(src) {
    let x = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
    let y = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;
    let cb = arguments.length > 3 ? arguments[3] : undefined;
    if (!(src instanceof this.constructor)) {
      return _utils.throwError.call(this, "The source must be a Jimp image", cb);
    }
    if (typeof x !== "number" || typeof y !== "number") {
      return _utils.throwError.call(this, "x and y must be numbers", cb);
    }

    // round input
    x = Math.round(x);
    y = Math.round(y);
    const w = this.bitmap.width;
    const h = this.bitmap.height;
    const baseImage = this;
    src.scanQuiet(0, 0, src.bitmap.width, src.bitmap.height, function (sx, sy, idx) {
      const destX = x + sx;
      const destY = y + sy;
      if (destX >= 0 && destY >= 0 && destX < w && destY < h) {
        const dstIdx = baseImage.getPixelIndex(destX, destY);
        const {
          data
        } = this.bitmap;
        const avg = (data[idx + 0] + data[idx + 1] + data[idx + 2]) / 3;
        baseImage.bitmap.data[dstIdx + 3] *= avg / 255;
      }
    });
    if ((0, _utils.isNodePattern)(cb)) {
      cb.call(this, null, this);
    }
    return this;
  }
});
exports.default = _default;
module.exports = exports.default;
module.exports.default = exports.default;
//# sourceMappingURL=index.js.map