Added solarize to MagickImage (#100)

src/magick-image.ts

@@ -247,6 +247,9 @@ export interface IMagickImage extends IDisposable {
     sigmoidalContrast(contrast: number, midpoint: number): void;
     sigmoidalContrast(contrast: number, midpoint: number, channels: Channels): void;
     splice(geometry: MagickGeometry): void;
+    solarize(): void;
+    solarize(factor: number): void;
+    solarize(factor: Percentage): void;
     statistics(): IStatistics;
     statistics(channels: Channels): IStatistics;
     strip(): void;
@@ -1328,6 +1331,14 @@ export class MagickImage extends NativeInstance implements IMagickImage {
         this._sigmoidalContrast(true, contrast, midpointOrPercentage, channelsOrUndefined)
     }
 
+    solarize(): void
+    solarize(numberOrPercentage: Percentage | number = new Percentage(50)): void {
+        Exception.use(exception => {
+            const factor = typeof numberOrPercentage === "number" ? new Percentage(numberOrPercentage) : numberOrPercentage;
+            ImageMagick._api._MagickImage_Solarize(this._instance, factor.toQuantum(), exception.ptr);
+        });
+    }
+
     splice(geometry: MagickGeometry): void {
         MagickRectangle.use(this, geometry, geometryPtr => {
             Exception.use(exception => {

tests/magick-image/solarize.spec.ts

@@ -0,0 +1,17 @@
+// Copyright Dirk Lemstra https://github.com/dlemstra/magick-wasm.
+// Licensed under the Apache License, Version 2.0.
+
+import { MagickColor } from '../../src/magick-color';
+import { MagickColors } from '../../src/magick-colors';
+import { TestImages } from '../test-images';
+
+describe('MagickImage#solarize', () => {
+    it('should solarize the image', () => {
+        TestImages.Builtin.logo.use(image => {
+            image.solarize();
+            expect(image).toHavePixelWithColor(125, 125, MagickColors.Black);
+            expect(image).toHavePixelWithColor(122, 143, new MagickColor('#007f7f'));
+            expect(image).toHavePixelWithColor(435, 240, new MagickColor('#2e6935'));
+        });
+    });
+});