[Webkit-unassigned] [Bug 190101] New: [macOS] Update Pasteboard::read to match NSTextView’s prioritization of native bitmap representations over TIFF

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190101

            Bug ID: 190101
           Summary: [macOS] Update Pasteboard::read to match NSTextView’s
                    prioritization of native bitmap representations over
                    TIFF
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: NeedsRadar
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mitz at webkit.org
                CC: wenson_hsieh at apple.com

Pasting a pasteboard that contains JPEG data into a web view results in a TIFF representation of the image getting pasted. This is undesirable, but it matches the historic behavior of NSTextView.

As of macOS Mojave, NSTextView checks for NSImage objects on the pasteboard, and given an NSImage, it first tries to get the image data from an existing EPS, PICT, PDF or bitmap representation (of whichever format), before falling back to the TIFF representation.

WebKit should replicate that behavior so that things don’t get unnecessarily transcoded (the JPEG to TIFF example is especially bad!).

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