67 lines
2.0 KiB
JavaScript
67 lines
2.0 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports["default"] = void 0;
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var _utils = require("@jimp/utils");
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/**
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* Applies a minimum color threshold to a greyscale image. Converts image to greyscale by default
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* @param {number} options object
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* max: A number auto limited between 0 - 255
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* replace: (optional) A number auto limited between 0 - 255 (default 255)
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* autoGreyscale: (optional) A boolean whether to apply greyscale beforehand (default true)
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* @param {number} cb (optional) a callback for when complete
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* @return {this} this for chaining of methods
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*/
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var _default = function _default() {
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return {
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threshold: function threshold(_ref, cb) {
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var _this = this;
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var max = _ref.max,
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_ref$replace = _ref.replace,
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replace = _ref$replace === void 0 ? 255 : _ref$replace,
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_ref$autoGreyscale = _ref.autoGreyscale,
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autoGreyscale = _ref$autoGreyscale === void 0 ? true : _ref$autoGreyscale;
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if (typeof max !== 'number') {
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return _utils.throwError.call(this, 'max must be a number', cb);
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}
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if (typeof replace !== 'number') {
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return _utils.throwError.call(this, 'replace must be a number', cb);
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}
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if (typeof autoGreyscale !== 'boolean') {
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return _utils.throwError.call(this, 'autoGreyscale must be a boolean', cb);
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}
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max = this.constructor.limit255(max);
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replace = this.constructor.limit255(replace);
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if (autoGreyscale) {
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this.greyscale();
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}
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this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function (x, y, idx) {
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var grey = _this.bitmap.data[idx] < max ? _this.bitmap.data[idx] : replace;
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_this.bitmap.data[idx] = grey;
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_this.bitmap.data[idx + 1] = grey;
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_this.bitmap.data[idx + 2] = grey;
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});
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if ((0, _utils.isNodePattern)(cb)) {
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cb.call(this, null, this);
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}
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return this;
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}
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};
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};
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exports["default"] = _default;
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module.exports = exports.default;
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//# sourceMappingURL=index.js.map
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