Initial commit

node_modules/@jimp/plugin-dither/src/index.ts

@@ -0,0 +1,37 @@
+import { JimpClass } from "@jimp/types";
+
+export const methods = {
+  /**
+   * Apply a ordered dithering effect.
+   * @example
+   * ```ts
+   * import { Jimp } from "jimp";
+   *
+   * const image = await Jimp.read("test/image.png");
+   *
+   * image.dither();
+   * ```
+   */
+  dither<I extends JimpClass>(image: I) {
+    const rgb565Matrix = [
+      1, 9, 3, 11, 13, 5, 15, 7, 4, 12, 2, 10, 16, 8, 14, 6,
+    ];
+
+    image.scan((x, y, idx) => {
+      const thresholdId = ((y & 3) << 2) + (x % 4);
+      const dither = rgb565Matrix[thresholdId]!;
+
+      image.bitmap.data[idx] = Math.min(image.bitmap.data[idx]! + dither, 0xff);
+      image.bitmap.data[idx + 1] = Math.min(
+        image.bitmap.data[idx + 1]! + dither,
+        0xff,
+      );
+      image.bitmap.data[idx + 2] = Math.min(
+        image.bitmap.data[idx + 2]! + dither,
+        0xff,
+      );
+    });
+
+    return image;
+  },
+};