Add Contain Image, Cover Image and Image Hue / Saturation / Lightness ops

src/core/operations/ImageHueSaturationLightness.mjs

@@ -0,0 +1,126 @@
+/**
+ * @author j433866 [j433866@gmail.com]
+ * @copyright Crown Copyright 2019
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
+import Magic from "../lib/Magic";
+import { toBase64 } from "../lib/Base64.mjs";
+import jimp from "jimp";
+
+/**
+ * Image Hue/Saturation/Lightness operation
+ */
+class ImageHueSaturationLightness extends Operation {
+
+    /**
+     * ImageHueSaturationLightness constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Image Hue/Saturation/Lightness";
+        this.module = "Image";
+        this.description = "Adjusts the hue / saturation / lightness (HSL) values of an image.";
+        this.infoURL = "";
+        this.inputType = "byteArray";
+        this.outputType = "byteArray";
+        this.presentType = "html";
+        this.args = [
+            {
+                name: "Hue",
+                type: "number",
+                value: 0,
+                min: -360,
+                max: 360
+            },
+            {
+                name: "Saturation",
+                type: "number",
+                value: 0,
+                min: -100,
+                max: 100
+            },
+            {
+                name: "Lightness",
+                type: "number",
+                value: 0,
+                min: -100,
+                max: 100
+            }
+        ];
+    }
+
+    /**
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {byteArray}
+     */
+    async run(input, args) {
+        const [hue, saturation, lightness] = args;
+        const type = Magic.magicFileType(input);
+
+        if (!type || type.mime.indexOf("image") !== 0){
+            throw new OperationError("Invalid file type.");
+        }
+
+        const image = await jimp.read(Buffer.from(input));
+
+        if (hue !== 0) {
+            if (ENVIRONMENT_IS_WORKER())
+                self.sendStatusMessage("Changing image hue...");
+            image.colour([
+                {
+                    apply: "hue",
+                    params: [hue]
+                }
+            ]);
+        }
+        if (saturation !== 0) {
+            if (ENVIRONMENT_IS_WORKER())
+                self.sendStatusMessage("Changing image saturation...");
+            image.colour([
+                {
+                    apply: "saturate",
+                    params: [saturation]
+                }
+            ]);
+        }
+        if (lightness !== 0) {
+            if (ENVIRONMENT_IS_WORKER())
+                self.sendStatusMessage("Changing image lightness...");
+            image.colour([
+                {
+                    apply: "lighten",
+                    params: [lightness]
+                }
+            ]);
+        }
+        const imageBuffer = await image.getBufferAsync(jimp.AUTO);
+        return [...imageBuffer];
+    }
+
+    /**
+     * Displays the image using HTML for web apps
+     * @param {byteArray} data
+     * @returns {html}
+     */
+    present(data) {
+        if (!data.length) return "";
+
+        let dataURI = "data:";
+        const type = Magic.magicFileType(data);
+        if (type && type.mime.indexOf("image") === 0){
+            dataURI += type.mime + ";";
+        } else {
+            throw new OperationError("Invalid file type");
+        }
+        dataURI += "base64," + toBase64(data);
+
+        return "<img src='" + dataURI + "'>";
+    }
+}
+
+export default ImageHueSaturationLightness;