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src/nodes/ToBlob.js

@@ -0,0 +1,36 @@
+import Node from './Node';
+import {createCanvas} from './canvas';
+
+export default class ToBlob extends Node {
+
+    constructor(options) {
+        super({
+            image: 'Image',
+        }, {
+            image: 'Image',
+        });
+        this.options = Object.assign({
+            quality: 100,
+            mimetype: 'image/jpeg',
+        }, options);
+    }
+
+    get mimetype() {
+        return this.options.mimetype;
+    }
+
+    get quality() {
+        return this.options.quality;
+    }
+
+    __update() {
+        const {width, height} = this.__in.image.value;
+        const canvas = createCanvas(width, height);
+        const ctx = canvas.getContext('2d');
+        ctx.putImageData(this.__in.image.value, 0, 0);
+        canvas.toBlob((blob) => {
+            this.__out.image.value = blob;
+        }, this.mimetype, this.quality);
+    }
+
+}