[Webkit-unassigned] [Bug 39050] New: Move transient glyph overflow and fallback font data from a global to the stack

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=39050

           Summary: Move transient glyph overflow and fallback font data
                    from a global to the stack
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitz at webkit.org


The way the lifetime of fallback font vectors and glyph overflow structures associated with text boxes is managed during layout is quite fragile. The data are inserted into a global map by one method, then consumed and removed by other methods. Instead, the map can be kept on the stack for the duration of line layout. Patch forthcoming.

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