based on the answer from @Michal Kalous I created an etension class.
This also takes into account the font size currently set in widows and the real viewport size and removes the vertical scrollbar by setting body.style.overflowY to hidden.
Usage
RemoteWebDriver driver = new EdgeDriver();
driver.SetViewportSize(1200, 1200);
driver.Navigate().GoToUrl("https://www.bikereview.info/en/ktm-1290-super-duke-rr-innerhalb-von-48-minuten-ausverkauft.html");
Image tempImage = driver.TakeFullPageScreenshot();
tempImage.Save(@"c:\full.png", ImageFormat.Png);
driver.Close();
driver.Quit();
Extension-Class
using System;
using System.Drawing;
using System.IO;
using OpenQA.Selenium.Remote;
using System.Collections.ObjectModel;
using System.Runtime.InteropServices;
using OpenQA.Selenium;
namespace TestRenderHtmlToPng
{
public static class RemoteWebDriverExtensions
{
public static Image TakeFullPageScreenshot(this RemoteWebDriver driver, int maxHeight = 10000)
{
//Screenshots depend on fontscaleing-property in windows
double DpiScalingFactor = GetDpiScalingFactor();
Bitmap fullPageScreenshot = null;
using (var fullMs = new MemoryStream((driver.GetScreenshotOverflowHidden()).AsByteArray))
{
fullPageScreenshot = Image.FromStream(fullMs) as Bitmap;
}
var originalPageOffset = driver.GetPageOffset();
var prevPageOffset = 0;
var currentPageOffset = 0;
var scrollLength = driver.GetWindowInnerHeight();
while (fullPageScreenshot.Height < maxHeight)
{
prevPageOffset = driver.GetPageOffset().Y;
driver.ScrollPageBy(0, scrollLength);
System.Threading.Thread.Sleep(100);
currentPageOffset = driver.GetPageOffset().Y;
if (prevPageOffset == currentPageOffset)
{
break;
}
var pageMovedBy = currentPageOffset - prevPageOffset;
pageMovedBy = (int)(pageMovedBy * DpiScalingFactor);
using (var ms = new MemoryStream(driver.GetScreenshotOverflowHidden().AsByteArray))
{
Bitmap fullPageScreenshot1 = Image.FromStream(ms) as Bitmap;
using (var viewPortScreenshot = Image.FromStream(ms) as Bitmap)
{
var s = driver.Manage().Window.Size;
var croppedScreenshot = CropBitmapAtRect(viewPortScreenshot, new Rectangle(0, viewPortScreenshot.Height - pageMovedBy, viewPortScreenshot.Width, pageMovedBy));
var newFullPage = AppendBitmap(fullPageScreenshot, croppedScreenshot);
fullPageScreenshot.Dispose();
fullPageScreenshot = newFullPage;
}
}
}
driver.ScrollPageTo(originalPageOffset.X, originalPageOffset.Y);
return fullPageScreenshot;
}
private static Bitmap CropBitmapAtRect(Bitmap b, Rectangle r)
{
Bitmap nb = new Bitmap(r.Width, r.Height);
using (Graphics g = Graphics.FromImage(nb))
{
g.DrawImage(b, -r.X, -r.Y);
return nb;
}
}
private static Bitmap AppendBitmap(Bitmap source, Bitmap target, int spacing = 0)
{
int w = Math.Max(source.Width, target.Width);
int h = source.Height + target.Height + spacing;
Bitmap bmp = new Bitmap(w, h);
using (Graphics g = Graphics.FromImage(bmp))
{
g.DrawImage(source, 0, 0);
g.DrawImage(target, 0, source.Height + spacing);
}
return bmp;
}
private static Screenshot GetScreenshotOverflowHidden(this RemoteWebDriver driver)
{
driver.ExecuteScript(@" document.body.style.overflowY = ""hidden"";");
var s = driver.GetScreenshot();
driver.ExecuteScript(@" document.body.style.overflowY = """";");
return s;
}
private static void ScrollPageBy(this RemoteWebDriver driver, int x = 0, int y = 0)
{
driver.ExecuteScript(@"window.scroll(window.pageXOffset + arguments[0], window.pageYOffset + arguments[1]);", x, y);
}
private static void ScrollPageTo(this RemoteWebDriver driver, int x = 0, int y = 0)
{
driver.ExecuteScript(@"window.scroll(arguments[0], arguments[1]);", x, y);
}
public static void SetViewportSize(this RemoteWebDriver driver, int width, int height)
{
var jsGetPadding = @"return [ window.outerWidth - window.innerWidth,window.outerHeight - window.innerHeight ];";
var paddingArray = driver.ExecuteScript(jsGetPadding) as ReadOnlyCollection<object>;
driver.Manage().Window.Size = new Size(width + int.Parse(paddingArray[0].ToString()), height + int.Parse(paddingArray[1].ToString()));
}
private static Point GetPageOffset(this RemoteWebDriver driver)
{
var offsetArray = driver.ExecuteScript(@"return [window.pageXOffset, window.pageYOffset];") as ReadOnlyCollection<object>;
var x = int.Parse(offsetArray[0].ToString());
var y = int.Parse(offsetArray[1].ToString().Split(',')[0]);
return new Point((int)x, (int)y);
}
private static int GetWindowInnerHeight(this RemoteWebDriver driver)
{
var Value = driver.ExecuteScript(@"return [window.innerHeight];") as ReadOnlyCollection<object>;
return int.Parse(Value[0].ToString());
}
[DllImport("gdi32.dll")]
private static extern int GetDeviceCaps(IntPtr hdc, int nIndex);
public enum DeviceCap
{
VERTRES = 10,
DESKTOPVERTRES = 117,
// http://pinvoke.net/default.aspx/gdi32/GetDeviceCaps.html
// https://mcmap.net/q/237469/-how-to-get-windows-display-settings#answer-21450169
}
private static float GetDpiScalingFactor()
{
Graphics g = Graphics.FromHwnd(IntPtr.Zero);
IntPtr desktop = g.GetHdc();
int LogicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.VERTRES);
int PhysicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.DESKTOPVERTRES);
float ScreenScalingFactor = (float)PhysicalScreenHeight / (float)LogicalScreenHeight;
return ScreenScalingFactor; // 1.25 = 125%
}
}
}
