Replace a headless browser for rendering

using System.Text;
using OneRender;
using OneRender.Image;
using OneRender.Interaction;
using OneRender.Pdf;
 
// What a headless browser would load from the network, the host supplies.
var files = new Dictionary<string, byte[]>
{
    ["https://app.example/css/report.css"] = Encoding.UTF8.GetBytes("""
        body { font: 15px/1.5 sans-serif; margin: 24px; color: #222 }
        .card { border: 1px solid #ddd; border-radius: 8px; padding: 12px 16px; margin: 0 0 12px }
        @media print { .no-print { display: none } }
        @page { size: A4; margin: 20mm; @bottom-center { content: "Page " counter(page) " of " counter(pages); font: 9pt sans-serif } }
        """),
};
byte[]? Resources(string url) => files.GetValueOrDefault(url);
 
var body = new StringBuilder();
for (int i = 1; i <= 12; i++)
    body.Append($"<div class=card><h2>Week {i}</h2><p>{i * 37} orders shipped.</p></div>");
string html = $"""
    <!DOCTYPE html>
    <html lang="en"><head><title>Shipping report</title><link rel="stylesheet" href="/css/report.css"></head>
    <body><button class="no-print">Download</button>{body}</body></html>
    """;
const string baseUrl = "https://app.example/reports/weekly";
 
// page.pdf({ format: 'A4', printBackground: true, displayHeaderFooter: true, ... })
HtmlPdfResult pdf = HtmlPdf.ToPdf(html, File.Create("report.pdf"), new HtmlPdfOptions { BaseUrl = baseUrl, Resources = Resources });
Console.WriteLine($"report.pdf: {pdf.PageCount} pages");
 
// page.setViewport({ width: 800, height: 600, deviceScaleFactor: 2 }); page.screenshot()
RgbaImage shot = HtmlRender.ToImage(html, new HtmlRenderOptions { Width = 800, Height = 600, DevicePixelRatio = 2, BaseUrl = baseUrl, Resources = Resources });
File.WriteAllBytes("viewport.png", shot.ToPng());
Console.WriteLine($"viewport.png: {shot.Width}x{shot.Height}");
 
// page.screenshot({ fullPage: true }): measure the document, then render that tall.
var measure = InteractivePage.Create(html, new HtmlPageOptions(FontProviders.CreateDefault())
    { ViewportWidth = 800, ViewportHeight = 600, BaseUrl = baseUrl, StylesheetBytes = Resources });
int height = measure.Layout.ScrollHeight(measure.Page.Document.DocumentElement);
RgbaImage full = HtmlRender.ToImage(html, new HtmlRenderOptions { Width = 800, Height = height, BaseUrl = baseUrl, Resources = Resources });
File.WriteAllBytes("full.png", full.ToPng());
Console.WriteLine($"full.png: {full.Width}x{full.Height}");

report.pdf: 2 pages
viewport.png: 1600x1200
full.png: 800x1818