[Webkit-unassigned] [Bug 275420] New: [Win][MiniBrowser] Render based on fractional device scale factor by using zoom factor

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275420

            Bug ID: 275420
           Summary: [Win][MiniBrowser] Render based on fractional device
                    scale factor by using zoom factor
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Windows 10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kohei.asano at sony.com
                CC: kkinnunen at apple.com

Non-integral device scale factor is possible on Windows, although it
isn't on other platform e.g. Mac or GTK.
Using fractional device scale factor isn't supported by current WebKit,
rendering noises remain when repainting display.

So far, we set custom device scale factor value 1 and used zoom factor
instead of device scale factor to avoid these noises. 
But using zoom factor doesn't scale scroll bar width, it seems weird 
especially on high DPI. It's better to round device scale factor,
scale the contents based on integral device scale factor
and let MiniBrowser adjust by page zoom factor.

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