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Macide Celik 2019-10-28 22:34:58 +03:00 • committed by GitHub
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src/core/operations/CoverImage.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 { isImage } from "../lib/FileType.mjs";
import { toBase64 } from "../lib/Base64.mjs";
import { isWorkerEnvironment } from "../Utils.mjs";
import jimp from "jimp";
/**
* Cover Image operation
*/
class CoverImage extends Operation {
/**
* CoverImage constructor
*/
constructor() {
super();
this.name = "Cover Image";
this.module = "Image";
this.description = "Scales the image to the given width and height, keeping the aspect ratio. The image may be clipped.";
this.infoURL = "";
this.inputType = "ArrayBuffer";
this.outputType = "ArrayBuffer";
this.presentType = "html";
this.args = [
{
name: "Width",
type: "number",
value: 100,
min: 1
},
{
name: "Height",
type: "number",
value: 100,
min: 1
},
{
name: "Horizontal align",
type: "option",
value: [
"Left",
"Center",
"Right"
],
defaultIndex: 1
},
{
name: "Vertical align",
type: "option",
value: [
"Top",
"Middle",
"Bottom"
],
defaultIndex: 1
},
{
name: "Resizing algorithm",
type: "option",
value: [
"Nearest Neighbour",
"Bilinear",
"Bicubic",
"Hermite",
"Bezier"
],
defaultIndex: 1
}
];
}
/**
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {byteArray}
*/
async run(input, args) {
const [width, height, hAlign, vAlign, alg] = args;
const resizeMap = {
"Nearest Neighbour": jimp.RESIZE_NEAREST_NEIGHBOR,
"Bilinear": jimp.RESIZE_BILINEAR,
"Bicubic": jimp.RESIZE_BICUBIC,
"Hermite": jimp.RESIZE_HERMITE,
"Bezier": jimp.RESIZE_BEZIER
};
const alignMap = {
"Left": jimp.HORIZONTAL_ALIGN_LEFT,
"Center": jimp.HORIZONTAL_ALIGN_CENTER,
"Right": jimp.HORIZONTAL_ALIGN_RIGHT,
"Top": jimp.VERTICAL_ALIGN_TOP,
"Middle": jimp.VERTICAL_ALIGN_MIDDLE,
"Bottom": jimp.VERTICAL_ALIGN_BOTTOM
};
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. (${err})`);
}
try {
if (isWorkerEnvironment())
self.sendStatusMessage("Covering image...");
image.cover(width, height, alignMap[hAlign] | alignMap[vAlign], resizeMap[alg]);
let imageBuffer;
if (image.getMIME() === "image/gif") {
imageBuffer = await image.getBufferAsync(jimp.MIME_PNG);
} else {
imageBuffer = await image.getBufferAsync(jimp.AUTO);
}
return imageBuffer.buffer;
} catch (err) {
throw new OperationError(`Error covering image. (${err})`);
}
}
/**
* Displays the covered 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 CoverImage;