pdf-visual-diff/lib/compare-images.js

Visual Regression Testing for PDFs in JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.compareImages = exports.mkDiffPath = void 0;
const jimp_1 = require("jimp");
const imageUtils_1 = require("./imageUtils");
const diffToken = '.diff';
const mkDiffPath = (path) => {
    const dotIndex = path.lastIndexOf('.');
    return dotIndex === -1
        ? path + diffToken
        : path.substring(0, dotIndex) + diffToken + path.substring(dotIndex);
};
exports.mkDiffPath = mkDiffPath;
const defaultOpts = {
    tolerance: 0,
};
const compareImages = async (expectedImagePath, images, options) => {
    const { tolerance } = {
        ...defaultOpts,
        ...options,
    };
    // @ts-expect-error it is a Jimp
    const expectedImg = await jimp_1.Jimp.read(expectedImagePath);
    // Multi image comparison not implemented!
    const img = (0, imageUtils_1.mergeImages)(images);
    const diff = (0, jimp_1.diff)(expectedImg, img, tolerance);
    if (diff.percent > 0) {
        return {
            equal: false,
            diffs: [{ page: 1, diff: diff.image }],
        };
    }
    return { equal: true };
};
exports.compareImages = compareImages;
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