Added chopHorizontal and chopVertical to MagickImage.

Author: dlemstra

src/magick-image.ts

@@ -685,6 +685,20 @@ export interface IMagickImage extends IDisposable {
      */
     chop(geometry: MagickGeometry): void;
 
+    /**
+     * Chop image (remove vertical or horizontal subregion of image).
+     * @param x The X offset from origin.
+     * @param width The width of the part to chop horizontally.
+     */
+    chopHorizontal(x: number, width: number): void;
+
+    /**
+     * Chop image (remove vertical or horizontal subregion of image).
+     * @param y The Y offset from origin.
+     * @param height The height of the part to chop vertically.
+     */
+    chopVertical(y: number, height: number): void;
+
     /**
      * A variant of adaptive histogram equalization in which the contrast amplification is limited,
      * so as to reduce this problem of noise amplification.
@@ -2691,6 +2705,14 @@ export class MagickImage extends NativeInstance implements IMagickImage {
         });
     }
 
+    chopHorizontal(x: number, width: number): void {
+        this.chop(new MagickGeometry(x, 0, width, 0));
+    }
+
+    chopVertical(y: number, height: number): void {
+        this.chop(new MagickGeometry(0, y, 0, height));
+    }
+
     clahe(xTiles: number, yTiles: number, numberBins: number, clipLimit: number): void;
     clahe(xTiles: Percentage, yTiles: Percentage, numberBins: number, clipLimit: number): void;
     clahe(xTiles: number | Percentage, yTiles: number | Percentage, numberBins: number, clipLimit: number): void {

tests/magick-image/chop-horizontal.spec.ts

@@ -0,0 +1,22 @@
+/*
+  Copyright Dirk Lemstra https://github.com/dlemstra/magick-wasm.
+  Licensed under the Apache License, Version 2.0.
+*/
+
+import { TestFiles } from '@test/test-files';
+
+describe('MagickImage#chopHorizontal', () => {
+    it('should remove part of the image', () => {
+        TestFiles.Images.Builtin.logo.use(image => {
+            image.chopHorizontal(100, 50);
+
+            expect(image.width).toBe(590);
+            expect(image.height).toBe(480);
+
+            expect(image).toHavePixelWithColor(99, 94, '#fff');
+            expect(image).toHavePixelWithColor(100, 94, '#f00');
+            expect(image).toHavePixelWithColor(99, 130, '#f5ee36');
+            expect(image).toHavePixelWithColor(100, 130, '#f00');
+        });
+    });
+});

tests/magick-image/chop-vertical.spec.ts

@@ -0,0 +1,22 @@
+/*
+  Copyright Dirk Lemstra https://github.com/dlemstra/magick-wasm.
+  Licensed under the Apache License, Version 2.0.
+*/
+
+import { TestFiles } from '@test/test-files';
+
+describe('MagickImage#chopVertical', () => {
+    it('should remove part of the image', () => {
+        TestFiles.Images.Builtin.logo.use(image => {
+            image.chopVertical(24, 42);
+
+            expect(image.width).toBe(640);
+            expect(image.height).toBe(438);
+
+            expect(image).toHavePixelWithColor(301, 23, '#f5ee36');
+            expect(image).toHavePixelWithColor(301, 24, '#f00');
+            expect(image).toHavePixelWithColor(247, 23, '#fff');
+            expect(image).toHavePixelWithColor(247, 24, '#f00');
+        });
+    });
+});