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Macide Celik 2019-10-28 12:17:28 +03:00 • committed by GitHub
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src/core/operations/BlurImage.mjs
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/**
* @author j433866 [j433866@gmail.com]
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import { isWorkerEnvironment } from "../Utils.mjs";
import { isImage } from "../lib/FileType.mjs";
import { toBase64 } from "../lib/Base64.mjs";
import jimp from "jimp";
import { gaussianBlur } from "../lib/ImageManipulation.mjs";
/**
* Blur Image operation
*/
class BlurImage extends Operation {
/**
* BlurImage constructor
*/
constructor() {
super();
this.name = "Blur Image";
this.module = "Image";
this.description = "Applies a blur effect to the image.<br><br>Gaussian blur is much slower than fast blur, but produces better results.";
this.infoURL = "https://wikipedia.org/wiki/Gaussian_blur";
this.inputType = "ArrayBuffer";
this.outputType = "ArrayBuffer";
this.presentType = "html";
this.args = [
{
name: "Amount",
type: "number",
value: 5,
min: 1
},
{
name: "Type",
type: "option",
value: ["Fast", "Gaussian"]
}
];
}
/**
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {byteArray}
*/
async run(input, args) {
const [blurAmount, blurType] = args;
if (!isImage(input)) {
throw new OperationError("Invalid file type.");
}
let image;
try {
image = await jimp.read(input);
} catch (err) {
throw new OperationError(`Error loading image. (${err})`);
}
try {
switch (blurType) {
case "Fast":
if (isWorkerEnvironment())
self.sendStatusMessage("Fast blurring image...");
image.blur(blurAmount);
break;
case "Gaussian":
if (isWorkerEnvironment())
self.sendStatusMessage("Gaussian blurring image...");
image = gaussianBlur(image, blurAmount);
break;
}
let imageBuffer;
if (image.getMIME() === "image/gif") {
imageBuffer = await image.getBufferAsync(jimp.MIME_PNG);
} else {
imageBuffer = await image.getBufferAsync(jimp.AUTO);
}
return imageBuffer.buffer;
} catch (err) {
throw new OperationError(`Error blurring image. (${err})`);
}
}
/**
* Displays the blurred image using HTML for web apps
*
* @param {ArrayBuffer} data
* @returns {html}
*/
present(data) {
if (!data.byteLength) return "";
const dataArray = new Uint8Array(data);
const type = isImage(dataArray);
if (!type) {
throw new OperationError("Invalid file type.");
}
return `<img src="data:${type};base64,${toBase64(dataArray)}">`;
}
}
export default BlurImage;