image-js/lib/image/internal/checks.js

Image processing and manipulation in JavaScript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.checkChannel = checkChannel;
exports.checkColumn = checkColumn;
exports.checkInterpolation = checkInterpolation;
exports.checkRow = checkRow;
exports.validInterpolations = void 0;
function checkRow(image, row) {
  if (row < 0 || row >= image.height) {
    throw new RangeError(`row must be included between 0 and ${image.height - 1}. Current value: ${row}`);
  }
}
function checkColumn(image, column) {
  if (column < 0 || column >= image.width) {
    throw new RangeError(`column must be included between 0 and ${image.width - 1}. Current value: ${column}`);
  }
}
function checkChannel(image, channel) {
  if (channel < 0 || channel >= image.channels) {
    throw new RangeError(`channel must be included between 0 and ${image.channels - 1}. Current value: ${channel}`);
  }
}

/**
 * @typedef {('nearestNeighbor'|'bilinear')} InterpolationAlgorithm
 */
const validInterpolations = exports.validInterpolations = {
  nearestneighbor: 'nearestNeighbor',
  nearestneighbour: 'nearestNeighbor',
  bilinear: 'bilinear'
};
function checkInterpolation(interpolation) {
  if (typeof interpolation !== 'string') {
    throw new TypeError('interpolation must be a string');
  }
  interpolation = interpolation.toLowerCase();
  if (!validInterpolations[interpolation]) {
    throw new RangeError(`invalid interpolation algorithm: ${interpolation}`);
  }
  return validInterpolations[interpolation];
}