index.js•1.29 kB
import { isNodePattern, throwError } from "@jimp/utils";
/**
* Displaces the image based on the provided displacement map
* @param {object} map the source Jimp instance
* @param {number} offset the maximum displacement value
* @param {function(Error, Jimp)} cb (optional) a callback for when complete
* @returns {Jimp} this for chaining of methods
*/
export default (() => ({
displace(map, offset, cb) {
if (typeof map !== "object" || map.constructor !== this.constructor) {
return throwError.call(this, "The source must be a Jimp image", cb);
}
if (typeof offset !== "number") {
return throwError.call(this, "factor must be a number", cb);
}
const source = this.cloneQuiet();
this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, function (x, y, idx) {
let displacement = map.bitmap.data[idx] / 256 * offset;
displacement = Math.round(displacement);
const ids = this.getPixelIndex(x + displacement, y);
this.bitmap.data[ids] = source.bitmap.data[idx];
this.bitmap.data[ids + 1] = source.bitmap.data[idx + 1];
this.bitmap.data[ids + 2] = source.bitmap.data[idx + 2];
});
if (isNodePattern(cb)) {
cb.call(this, null, this);
}
return this;
}
}));
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