[Webkit-unassigned] [Bug 66564] New: WebKit uses the main screen's backing scale factor when it has no window, which isn't really relevant

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=66564

           Summary: WebKit uses the main screen's backing scale factor
                    when it has no window, which isn't really relevant
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.7
            Status: NEW
          Keywords: PlatformOnly
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com
                CC: hyatt at apple.com, sullivan at apple.com, darin at apple.com,
                    simon.fraser at apple.com,
                    webkit-bug-importer at group.apple.com


WebKit currently falls back to using the main screen's backing scale factor when it has no associated window. But since multiple screens and windows can have different backing scale factor, the main screen's backing scale factor isn't really relevant.

The main options I can think of when we have no window are:
1) Use a backing scale factor of 1
2) Use the highest backing scale factor of any screen
3) Use the lowest backing scale factor of any screen
4) Use the backing scale factor of the main screen if all screens have the same backing scale factor

(1) seems the simplest, so I think I'll go with that for now.

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