41 lines
1.7 KiB
JavaScript
41 lines
1.7 KiB
JavaScript
function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
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import { isNodePattern, throwError } from '@jimp/utils';
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/**
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* Displaces the image based on the provided displacement map
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* @param {object} map the source Jimp instance
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* @param {number} offset the maximum displacement value
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* @param {function(Error, Jimp)} cb (optional) a callback for when complete
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* @returns {Jimp} this for chaining of methods
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*/
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export default (function () {
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return {
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displace: function displace(map, offset, cb) {
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if (_typeof(map) !== 'object' || map.constructor !== this.constructor) {
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return throwError.call(this, 'The source must be a Jimp image', cb);
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}
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if (typeof offset !== 'number') {
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return throwError.call(this, 'factor must be a number', cb);
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}
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var source = this.cloneQuiet();
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this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function (x, y, idx) {
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var displacement = map.bitmap.data[idx] / 256 * offset;
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displacement = Math.round(displacement);
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var ids = this.getPixelIndex(x + displacement, y);
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this.bitmap.data[ids] = source.bitmap.data[idx];
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this.bitmap.data[ids + 1] = source.bitmap.data[idx + 1];
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this.bitmap.data[ids + 2] = source.bitmap.data[idx + 2];
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});
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if (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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//# sourceMappingURL=index.js.map
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