[Webkit-unassigned] [Bug 161450] New: No reliable way to get a snapshot of WKWebView (macOS)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161450

            Bug ID: 161450
           Summary: No reliable way to get a snapshot of WKWebView (macOS)
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit API
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dasau at microsoft.com

The cocoa API -[NSView cacheDisplayInRect:(NSRect)rect toBitmapImageRep:(NSBitmapImageRep *)bitmapImageRep] does not work for WKWebView, it only returns an empty image. We need a way to get the visible contents of the web page on macOS. The UI is rendered in a separate process, there should be an API to grab the visible bitmap from the UI process and expose it as a method on WKWebView that the embedding application can consume. We need to be able to grab the web page contents regardless if the WKWebView is hidden or overlapped by other views, CGWindowListCreateImage will not work for that scenario.

For iOS, you can use the -[UIView drawViewHierarchyInRect:(CGRect)rect afterScreenUpdates:(BOOL)afterUpdates] API to get the web page contents.

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