CefSharp OffScreen has wrong values for width and height in window.screen where as CefSharp WinForms has correct values

[Girivasan]

Our app is a background application which records screen using navigator.mediaDevices apis. Since it is a background application, we opted for CefSharp OffScreen. On investigation, I found out that recorded screen resolution is reduced one and with lower quality.

My Windows laptop resolution is 1920 x 1080

I compared below values in CefSharp Minimal Example project (OffScreen vs WinForms)

OffScreen: Here resolution is 1366 x 768

WinForms: Here resolution is 1920 x 1080 (resolution width = 1536 * 1.25 = 1920, resolution height = 864 * 1.25 = 1080) . These values align with chrome and firefox values.

What needs to be done to get correct screen resolution in CefSharp OffScreen similar to CefSharp Winforms ? Anyone please help

Or is there a way to run CefSharp Winforms as a background application without showing any UI ?

Additional note :

• I cannot preconfigure browser size because the same application needs to record multiple monitors
• In case of multiple monitors, resolution is reduced in the additional monitor in case of CefSharp Offscreen

[amaitland]

The default size is 1366 x 768

You can specify the size via the Size property

https://github.com/cefsharp/CefSharp/blob/master/CefSharp.OffScreen/ChromiumWebBrowser.cs#L416

You can specify the scale via DeviceScaleFactor property

https://github.com/cefsharp/CefSharp/blob/master/CefSharp.OffScreen/ChromiumWebBrowser.cs#L436

It's up to you to configure the values to suit your requirements.