jtanx

Afrikaans_South Africa.1252
Albanian_Albania.1250
Alsatian_France.1252
Arabic_Algeria.1256
Arabic_Bahrain.1256
Arabic_Egypt.1256
Arabic_Iraq.1256
Arabic_Jordan.1256
Arabic_Kuwait.1256
Arabic_Lebanon.1256

jtanx

bootstrap: running: libtoolize --quiet
bootstrap: running: git clone --depth 365 'git://git.sv.gnu.org/gnulib' 'gnulib'
Cloning into 'gnulib'...
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jtanx

Reference material: http://www.microsoft.com/typography/otspec/cmap.htm

Convert Unicode string using the appropriate encoding (e.g ShiftJIS). For each unicode code point, store the corresponding multibyte character sequence in little endian format.

E.g: Suppose you converted the character 'コ' (U+30B3) using ShiftJIS encoding. This would give the bytes [0x83, 0x52]. Store the result in a WORD (or larger sized variable) to give 0x8352 as the value. Use this value to lookup the glyph id from the cmap.

Conversion between charsets may be achieved through a number of ways, such as by using ICU. On Windows, the Unicode and Character set functions, such as WideChartoMultiByte may be used instead. Depending on the language, there may be in-built character set conversion utilities.

jtanx

For OS/2 table versions >= 3, take the sum of the advancement widths (from the hmtx table) of each glyph, iff the advancement width is greater than zero. Do integer division of this sum by the number of glyphs that had an advancement width > 0.

For versions < 3, follow a similar procedure, but weight according to: http://www.microsoft.com/typography/otspec/os2ver2.htm#acw, and only consider lowercase latin characters for the average.