pdf-visual-diff/lib/imageUtils/mergeImages.js

Visual Regression Testing for PDFs in JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.mergeImages = mergeImages;
const jimp_1 = require("jimp");
/**
 * Merges an array of Jimp images into a single image.
 *
 * @param images - An array of Jimp images to be merged.
 * @returns A Jimp image that is the result of merging all input images.
 */
function mergeImages(images) {
    let imgHeight = 0;
    const imgData = images.map((img) => {
        const res = { img, y: imgHeight };
        imgHeight += img.height;
        return res;
    });
    const imgWidth = Math.max(...imgData.map(({ img }) => img.width));
    const baseImage = new jimp_1.Jimp({ width: imgWidth, height: imgHeight, color: 0x00000000 });
    imgData.forEach(({ img, y }) => baseImage.composite(img, 0, y));
    return baseImage;
}
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