Bug 25958

Summary: investigate matching IE's text-control widths for fonts where the OS/2 table as a non-positive avgCharWidth
Product: WebKit Reporter: Ojan Vafai <ojan>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal    
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Mac   
OS: OS X 10.5   
Bug Depends on: 25566    
Bug Blocks:    

Description Ojan Vafai 2009-05-22 02:34:43 PDT
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.