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Filename : index.js
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"use strict";

var _interopRequireWildcard = require("@babel/runtime/helpers/interopRequireWildcard");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = composite;

var _utils = require("@jimp/utils");

var constants = _interopRequireWildcard(require("../constants"));

var compositeModes = _interopRequireWildcard(require("./composite-modes"));

/**
 * Composites a source image over to this image respecting alpha channels
 * @param {Jimp} src the source Jimp instance
 * @param {number} x the x position to blit the image
 * @param {number} y the y position to blit the image
 * @param {object} options determine what mode to use
 * @param {function(Error, Jimp)} cb (optional) a callback for when complete
 * @returns {Jimp} this for chaining of methods
 */
function composite(src, x, y) {
  var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
  var cb = arguments.length > 4 ? arguments[4] : undefined;

  if (typeof options === "function") {
    cb = options;
    options = {};
  }

  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);
  }

  var _options = options,
      mode = _options.mode,
      opacitySource = _options.opacitySource,
      opacityDest = _options.opacityDest;

  if (!mode) {
    mode = constants.BLEND_SOURCE_OVER;
  }

  if (typeof opacitySource !== "number" || opacitySource < 0 || opacitySource > 1) {
    opacitySource = 1.0;
  }

  if (typeof opacityDest !== "number" || opacityDest < 0 || opacityDest > 1) {
    opacityDest = 1.0;
  } // eslint-disable-next-line import/namespace


  var blendmode = compositeModes[mode]; // round input

  x = Math.round(x);
  y = Math.round(y);
  var baseImage = this;

  if (opacityDest !== 1.0) {
    baseImage.opacity(opacityDest);
  }

  src.scanQuiet(0, 0, src.bitmap.width, src.bitmap.height, function (sx, sy, idx) {
    var dstIdx = baseImage.getPixelIndex(x + sx, y + sy, constants.EDGE_CROP);
    var blended = blendmode({
      r: this.bitmap.data[idx + 0] / 255,
      g: this.bitmap.data[idx + 1] / 255,
      b: this.bitmap.data[idx + 2] / 255,
      a: this.bitmap.data[idx + 3] / 255
    }, {
      r: baseImage.bitmap.data[dstIdx + 0] / 255,
      g: baseImage.bitmap.data[dstIdx + 1] / 255,
      b: baseImage.bitmap.data[dstIdx + 2] / 255,
      a: baseImage.bitmap.data[dstIdx + 3] / 255
    }, opacitySource);
    baseImage.bitmap.data[dstIdx + 0] = this.constructor.limit255(blended.r * 255);
    baseImage.bitmap.data[dstIdx + 1] = this.constructor.limit255(blended.g * 255);
    baseImage.bitmap.data[dstIdx + 2] = this.constructor.limit255(blended.b * 255);
    baseImage.bitmap.data[dstIdx + 3] = this.constructor.limit255(blended.a * 255);
  });

  if ((0, _utils.isNodePattern)(cb)) {
    cb.call(this, null, this);
  }

  return this;
}

module.exports = exports.default;
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