Introduction

Almost no application is complete without uploading files, especially images, this section is all about images.

Setup

Warlock is shipped with Sharp which is a high performance Node.js image processing library.

Upload an image

When Uploading images and with the compress mode activated, Warlock uses Sharp to compress the images.

Manual image processing

Warlock provides a simple way to process images using Sharp by wrapping the Sharp class by Warlock Image class.

Basic Usage

To use the Image class, import it from @warlock.js/core:

src/app/main.ts

import { storagePath, Image } from "@warlock.js/core";

async function main() {
  const imagePath = storagePath("images/image.jpg");

  const image = new Image(imagePath);
}

main();

Now let's resize the image:

src/app/main.ts

import { storagePath, Image } from "@warlock.js/core";

async function main() {
  const imagePath = storagePath("images/image.jpg");

  const image = new Image(imagePath);

  image.resize(200, 200);

  await image.save(storagePath("images/resized-image.jpg"));
}

Here we resized the image to 200x200, and saved it to storage/images/resized-image.jpg.

Watermark

Another good and important feature is to add watermarks in the images, luckily, Warlock provides a simple way to do that.

src/app/main.ts

import { storagePath, Image } from "@warlock.js/core";

async function main() {
  const imagePath = storagePath("images/image.jpg");

  const image = new Image(imagePath);

  await image.watermark(storagePath("images/watermark.png"), {
    gravity: "northwest",
  });

  await image.save(storagePath("images/watermarked-image.jpg"));
}

The watermark method accepts the watermark image path or an instance of Image class.

Multiple Watermarks

In some situations, you may need to add multiple watermarks to the image, for example, you may need to add a watermark to the top left corner, and another one to the bottom right corner.

To do that, you can use the watermarks method:

src/app/main.ts

import { storagePath, Image } from "@warlock.js/core";
import watermarkImage1 from "./../images/watermark-1.png";
import watermarkImage2 from "./../images/watermark-2.png";
import image from "./../images/image.jpg";

async function main() {
  const imagePath = storagePath("images/image.jpg");

  const image = new Image(imagePath);

  await image.watermarks([
    {
      image: watermarkImage1,
      gravity: "northwest",
    },
    {
      image: watermarkImage2,
      gravity: "southeast",
    },
  ]);

  await image.save(storagePath("images/watermarked-image.jpg"));
}