yeet

node_modules/@jimp/plugin-threshold/src/index.js

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+import { isNodePattern, throwError } from '@jimp/utils';
+
+/**
+ * Applies a minimum color threshold to a greyscale image.  Converts image to greyscale by default
+ * @param {number} options object
+ *  max: A number auto limited between 0 - 255
+ *  replace: (optional) A number auto limited between 0 - 255 (default 255)
+ *  autoGreyscale: (optional) A boolean whether to apply greyscale beforehand (default true)
+ * @param {number} cb (optional) a callback for when complete
+ * @return {this} this for chaining of methods
+ */
+export default () => ({
+  threshold({ max, replace = 255, autoGreyscale = true }, cb) {
+    if (typeof max !== 'number') {
+      return throwError.call(this, 'max must be a number', cb);
+    }
+
+    if (typeof replace !== 'number') {
+      return throwError.call(this, 'replace must be a number', cb);
+    }
+
+    if (typeof autoGreyscale !== 'boolean') {
+      return throwError.call(this, 'autoGreyscale must be a boolean', cb);
+    }
+
+    max = this.constructor.limit255(max);
+    replace = this.constructor.limit255(replace);
+
+    if (autoGreyscale) {
+      this.greyscale();
+    }
+
+    this.scanQuiet(0, 0, this.bitmap.width, this.bitmap.height, (x, y, idx) => {
+      const grey =
+        this.bitmap.data[idx] < max ? this.bitmap.data[idx] : replace;
+
+      this.bitmap.data[idx] = grey;
+      this.bitmap.data[idx + 1] = grey;
+      this.bitmap.data[idx + 2] = grey;
+    });
+
+    if (isNodePattern(cb)) {
+      cb.call(this, null, this);
+    }
+
+    return this;
+  }
+});