[Webkit-unassigned] [Bug 25958] New: investigate matching IE's text-control widths for fonts where the OS/2 table as a non-positive avgCharWidth

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=25958

           Summary: investigate matching IE's text-control widths for fonts
                    where the OS/2 table as a non-positive avgCharWidth
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ojan at chromium.org
 BugsThisDependsOn: 25566


Once bug 25566 is fixed to use the avgCharWidth in the OS/2 table, we should
investigate how IE calculates this value for fonts that have a non-positive
(invalid) avgCharWidth in the OS/2 table.

I currently see two options. 

1. Take the arithmetic average from the hmtx table and see how close that gets
us to IE's numbers.

2. Use the width of a '0' character as that matches Safari 3 behavior and the
fonts with negative OS/2 avgCharWidth values seem to all be Mac fonts.


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