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test: Replace resemblejs with looks-same #1448

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Merged
manthey merged 1 commit into from
Jan 19, 2026
Merged

test: Replace resemblejs with looks-same #1448

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27 changes: 12 additions & 15 deletions karma-base.js
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Original file line number Diff line number Diff line change
Expand Up @@ -72,33 +72,30 @@ function getScreenImage(name, left, top, width, height) {
}

/* Compare an image to a base image. If it violates a threshold, save the
* image and a diff between it and the base image. Returns the resemble
* results.
* image.
*
* @param {string} name: base name for the image.
* @param {string} image: a base64 encoded png image.
* @param {number} threshold: allowed difference between this image and the
* base image.
* @param {Function} callback: a function to call when complete.
* @param {Function} callback: a function to call when complete with the
* direct comparison results.
*/
function compareImage(name, image, threshold, callback) {
var resemble = require('resemblejs');
var src = path.resolve('dist/data/base-images', name + '.png');
const looksSame = require('looks-same');
let src = path.resolve('dist/data/base-images', name + '.png');
if (!fs.existsSync(src)) {
src = path.resolve(image_path, name + '.png');
}
var refImage = Buffer.from(fs.readFileSync(src)).toString('base64');
refImage = 'data:image/png;base64,' + refImage;
resemble(image)
.compareTo(refImage)
.ignoreAntialiasing()
.onComplete(function (results) {
console.log('Image comparison: ' + name + ', delta: ' +
Number(results.misMatchPercentage) * 0.01);
var passed = (Number(results.misMatchPercentage) <= threshold * 100);
const refImageBuf = Buffer.from(fs.readFileSync(src));
const refImage = 'data:image/png;base64,' + refImageBuf.toString('base64');
const imageBuf = Buffer.from(image.replace(/^data:image\/png;base64,/, ''), 'base64');
looksSame(imageBuf, refImageBuf, {ignoreAntialiasing: true, threshold: threshold})
.then(function (results) {
console.log('Image comparison: ' + name + ', equal: ' + results.equal);
var passed = results.equal;
saveImage(name + '-base', refImage, !passed);
saveImage(name + '-test', image, !passed);
saveImage(name + '-diff', results.getImageDataUrl(), !passed);
results.passed = passed;
if (callback) {
callback(results);
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