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import * as fs from 'fs';
import { Page } from 'playwright-core';
import { PNG } from 'pngjs';
import { screenshot, WindowInfo } from 'screenshot-ftw';
// eslint-disable-next-line ban/ban
const waitMS = (ms: number) => new Promise(resolve => setTimeout(resolve, ms));
export function readPng(filename: string) {
const data = fs.readFileSync(filename);
return PNG.sync.read(data);
}
export function writePng(filename: string, width: number, height: number, data: Buffer) {
const png = new PNG({ colorType: 6, width, height });
for (let i = 0; i < data.byteLength; ++i) {
png.data[i] = data[i];
}
const buffer = PNG.sync.write(png);
fs.writeFileSync(filename, buffer);
}
export class ScreenshotManager {
window?: WindowInfo;
async init(page: Page) {
// set the title to some random number so we can find the window by title
const title: string = await page.evaluate(() => {
const title = `t-${Math.random()}`;
document.title = title;
return title;
});
// wait for the window to show up
let window;
for (let i = 0; !window && i < 100; ++i) {
await waitMS(50);
const windows = await screenshot.getWindows();
window = windows.find(window => window.title.includes(title));
}
if (!window) {
throw Error(`could not find window: ${title}`);
}
this.window = window;
}
async takeScreenshot(page: Page, screenshotName: string) {
// await page.screenshot({ path: screenshotName });
// we need to set the url and title since the screenshot will include the chrome
await page.evaluate(async () => {
document.title = 'screenshot';
window.history.replaceState({}, '', '/screenshot');
});
await screenshot.captureWindowById(screenshotName, this.window!.id);
}
}
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