Added thumbnail to MagickImage (#183)

src/magick-image.ts

@@ -1692,6 +1692,19 @@ export interface IMagickImage extends IDisposable {
      */
     threshold(percentage: Percentage, channels: Channels): void;
 
+    /**
+     * Resize image to thumbnail size and remove all the image profiles except the icc/icm profile.
+     * @param width The new width.
+     * @param height The new height.
+     */
+    thumbnail(width: number, height: number): void;
+
+    /**
+     * Resize image to thumbnail size and remove all the image profiles except the icc/icm profile.
+     * @param geometry The geometry to use.
+     */
+    thumbnail(geometry: IMagickGeometry): void;
+
     /**
      * Returns a string that represents the current image.
      */
@@ -3209,6 +3222,18 @@ export class MagickImage extends NativeInstance implements IMagickImage {
         });
     }
 
+    thumbnail(width: number, height: number): void;
+    thumbnail(geometry: IMagickGeometry): void;
+    thumbnail(widthOrGeometry: number | IMagickGeometry, heightOrUndefined?: number): void {
+        const geometry = typeof widthOrGeometry === 'number' ? new MagickGeometry(widthOrGeometry, heightOrUndefined as number) : widthOrGeometry;
+        this.useException(exception => {
+            _withString(geometry.toString(), geometryPtr => {
+                const instance = ImageMagick._api._MagickImage_Thumbnail(this._instance, geometryPtr, exception.ptr);
+                this._setInstance(instance, exception);
+            });
+        });
+    }
+
     toString = (): string => `${this.format} ${this.width}x${this.height} ${this.depth}-bit ${ColorSpace[this.colorSpace]}`
 
     transparent(color: IMagickColor): void {

tests/magick-image/thumbnail.spec.ts

@@ -0,0 +1,56 @@
+/*
+  Copyright Dirk Lemstra https://github.com/dlemstra/magick-wasm.
+  Licensed under the Apache License, Version 2.0.
+*/
+
+import { MagickGeometry } from '@src/types/magick-geometry';
+import { TestImages } from '@test/test-images';
+
+describe('MagickImage#thumbnail', () => {
+    it('should resize the image to within the given dimensions', () => {
+        TestImages.Builtin.logo.use(image => {
+            image.thumbnail(100, 100);
+
+            expect(image.width).toBe(100);
+            expect(image.height).toBe(75);
+        });
+    });
+
+    it('should resize the image based on the given width', () => {
+        TestImages.Builtin.logo.use(image => {
+            image.thumbnail(150, 0);
+
+            expect(image.width).toBe(150);
+            expect(image.height).toBe(113);
+        });
+    });
+
+    it('should resize the image based on the given height', () => {
+        TestImages.Builtin.logo.use(image => {
+            image.thumbnail(0, 100);
+
+            expect(image.width).toBe(133);
+            expect(image.height).toBe(100);
+        });
+    });
+
+    it('should resize based on the given geometry', () => {
+        TestImages.Builtin.logo.use(image => {
+            image.thumbnail(new MagickGeometry(200, 200));
+
+            expect(image.width).toBe(200);
+            expect(image.height).toBe(150);
+        });
+    });
+
+    it('should remove all image profiles except the icc/icm profile', () => {
+        TestImages.fujiFilmFinePixS1ProJpg.use(image => {
+            expect(image.profileNames.length).toBe(5);
+
+            image.thumbnail(100, 100);
+
+            expect(image.profileNames.length).toBe(1);
+            expect(image.profileNames[0]).toBe('icc');
+        });
+    });
+});