image-js/lib/image/compute/sum.js

Image processing and manipulation in JavaScript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = sum;
var _newArray = _interopRequireDefault(require("new-array"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
/**
 * Returns an array with the sum of the values of each channel
 * @memberof Image
 * @instance
 * @return {number[]} Array having has size the number of channels
 */
function sum() {
  this.checkProcessable('sum', {
    bitDepth: [8, 16]
  });
  let result = (0, _newArray.default)(this.channels, 0);
  for (let i = 0; i < this.data.length; i += this.channels) {
    for (let c = 0; c < this.channels; c++) {
      result[c] += this.data[i + c];
    }
  }
  return result;
}