Add flip image operation

This commit is contained in:
j433866 2019-02-20 13:04:15 +00:00
parent fd160e87e8
commit da838e266e
2 changed files with 92 additions and 1 deletions

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@ -364,7 +364,8 @@
"Resize Image",
"Blur Image",
"Dither Image",
"Invert Image"
"Invert Image",
"Flip Image"
]
},
{

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@ -0,0 +1,90 @@
/**
* @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";
import jimp from "jimp";
/**
* Flip Image operation
*/
class FlipImage extends Operation {
/**
* FlipImage constructor
*/
constructor() {
super();
this.name = "Flip Image";
this.module = "Image";
this.description = "Flips an image along its X or Y axis.";
this.infoURL = "";
this.inputType = "byteArray";
this.outputType = "byteArray";
this.presentType="html";
this.args = [
{
name: "Flip Axis",
type: "option",
value: ["Horizontal", "Vertical"]
}
];
}
/**
* @param {byteArray} input
* @param {Object[]} args
* @returns {byteArray}
*/
async run(input, args) {
const [flipAxis] = args;
const type = Magic.magicFileType(input);
if (!type || type.mime.indexOf("image") !== 0){
throw new OperationError("Invalid input file type.");
}
const image = await jimp.read(Buffer.from(input));
switch (flipAxis){
case "Horizontal":
image.flip(true, false);
break;
case "Vertical":
image.flip(false, true);
break;
}
const imageBuffer = await image.getBufferAsync(jimp.AUTO);
return [...imageBuffer];
}
/**
* Displays the flipped 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 FlipImage;