Assigning Windows CharSet id to OS/2 Fonts

To assign Windows CharSet id to OS/2 font, the Open32 NLS Extension refers to the following information.

• Glyph List Name - represents set and order of glyphs in a font.
  
• usCodePage in the font metrics - represents set and order of glyphs in a font.
  
• System Default Codepage - represents set and order of glyphs in device UGL fonts.
  
• System OEM Codepage - represents set and order of glyphs used by base OS.
  
• sLastChar in the font metrics - represents set of glyphs in a font.
  
• fsType in the font metrics - represents the type of a font (MBCS or not).
  
• sFamilyClass in the font metrics - to detect Symbol fonts.
  
• szFamilyName in the font metrics - to detect Symbol fonts.

Note: Checking the type of fonts may take some overhead. To have enough performance, the Open32 NLS Extension manages the list of fonts internally and keeps Windows CharSet ids in the list. The GpiQueryFontAction OS/2 function will be used to keep the li updated.

Symbol Fonts

The symbol font contains symbolic (pictorial) glyphs. Because the symbol font is never used for scripting text, it does not have other CharSet ids than SYMBOL_CHARSET.

SYMBOL_CHARSET : Symbol Font (Exclusive)

sFamilyClass = Symbolic (0x000C). SubClass (0x??00) can be vary.szFamilyName contains the string "Symbol" (for backward compatibility).

Fonts for Scripting Text (for GUI Applications - Windows ANSI CharSet)

If a font is not the symbol font, the font is for scripting text. The font in this category contains known set of glyphs in know order. An OS/2 UGL font supports more than one Windows ANSI CharSet. The Open32 NLS Extension returns all possible Window s ANSI CharSets for each OS/2 UGL font.

ANSI_CHARSET : U.S. and Western Europe Font

GlyphListName = "PM383",  or "UNICODE"
GlyphListName = NULL, and usCodePage = 0, fsType != FM_TYPE_MBCS
GlyphListName = NULL, and usCodePage = 1252 (U.S. and Western Europe Only)

EASTEUROPE_CHARSET : Eastern Europe Font

GlyphListName = "PM383",  or "UNICODE"
GlyphListName = NULL, and usCodePage = 0, fsType != FM_TYPE_MBCS
GlyphListName = NULL, and usCodePage = 1250 (Eastern Europe Only)

TURKISH_CHARSET : Turkish Font

GlyphListName = "PM383",  or "UNICODE"
GlyphListName = NULL, and usCodePage = 0, fsType != FM_TYPE_MBCS
GlyphListName = NULL, and usCodePage = 1254 (Turkish Only)

RUSSIAN_CHARSET : Russian Font

GlyphListName = "UNICODE"
GlyphListName = "PM383", and  sLastChar >= 504
GlyphListName = NULL, and usCodePage = 0, fsType != FM_TYPE_MBCS, and sLastChar > =504
GlyphListName = NULL, and usCodePage = 1251 (Cyrillic Only)

GREEK_CHARSET : Greek Font

GlyphListName = "UNICODE"
GlyphListName = "PM383", and  sLastChar >= 504
GlyphListName = NULL, and usCodePage = 0, fsType != FM_TYPE_MBCS, and sLastChar > =504
GlyphListName = NULL, and usCodePage = 1253 (Greek Only)

HEBREW_CHARSET : Hebrew Font

GlyphListName = "UNICODE"
GlyphListName = "PM383", and  sLastChar >= 504
GlyphListName = NULL, and usCodePage = 0, fsType != FM_TYPE_MBCS, and sLastChar > =504
GlyphListName = NULL, and usCodePage = 1255 (Hebrew Only)

ARABIC_CHARSET : Arabic Font

GlyphListName = "UNICODE"
GlyphListName = "PM383", and  sLastChar >= 504
GlyphListName = NULL, and usCodePage = 0, fsType != FM_TYPE_MBCS, and sLastChar > =504
GlyphListName = NULL, and usCodePage = 1256 (Arabic Only)

BALTIC_CHARSET : Baltic Font

GlyphListName = "UNICODE"
GlyphListName = "PM383", and  sLastChar >= 504
GlyphListName = NULL, and usCodePage = 0, fsType != FM_TYPE_MBCS, and sLastChar > =504
GlyphListName = NULL, and usCodePage = 1257 (Baltic Only)

THAI_CHARSET : Thai Font

GlyphListName = "UNICODE"
GlyphListName = NULL, and usCodePage = 874 (Thai Only)

SHIFTJIS_CHARSET : Japanese Font

GlyphListName = "UNICODE"
GlyphListName = "PMJPN" (Japanese + UGL)
GlyphListName = NULL, usCodePage = 0, fsType = FM_TYPE_MBCS, and SystemCp = 932, 942 or 943 (Japanese + UGL)
GlyphListName = NULL, and usCodePage = 932, 942 or 943 (Japanese Only)

HANGEUL_CHARSET : Hangeul (Wansung) Font

GlyphListName = "UNICODE"
GlyphListName = "PMKOR" or "PMKS" (Hangeul + UGL)
GlyphListName = NULL, usCodePage = 0, fsType = FM_TYPE_MBCS, and SystemCp = 949 (Hangeul + UGL)
GlyphListName = NULL, and usCodePage = 949 (Hangeul Wansung Only)

JOHAB_CHARSET : Hangeul (Johab) Font

GlyphListName = "UNICODE" (if Codepage 1361 is supported by PMWIN)
GlyphListName = NULL, and usCodePage = 1361 (Hangeul Johab Only)

CHINESEBIG5_CHARSET : Traditional Chinese Font

GlyphListName = "UNICODE"
GlyphListName = "PMTWN" or "PMBIG5" (T-Chinese + UGL)
GlyphListName = NULL, usCodePage = 0, fsType = FM_TYPE_MBCS, and SystemCp = 950 (T-Chinese + UGL)
GlyphListName = NULL, and usCodePage = 950 (T-Chinese Only)

GB2312_CHARSET : Simplified Chinese Font

GlyphListName = "UNICODE"
GlyphListName = "PMPRC" or "PMGB" (S-Chinese + UGL)
GlyphListName = NULL, usCodePage = 0, fsType = FM_TYPE_MBCS, and SystemCp = 1381 (S-Chinese + UGL)
GlyphListName = NULL, and usCodePage = 1381 (S-Chinese Only)

Note: SystemCp (System Default Codepage) should be obtained with GetLocaleInfo Open32 function with LOCALE_IDEFAULTANSICODEPAGE for LOCALE_SYSTEM_DEFAULT.

Fonts for Scripting Text (for Base Operating System - Windows OEM CharSet)

The base operating system may use the different CharSet from the ones used by GUI applications. In Windows the CharSet used by file system, text console and some other purposes is categorized as OEM CharSet. The OS/2 PM applications also have used this OEM CharSet for drawing text. To keep backward compatibility, the Open32 NLS Extension returns one OEM CharSet for each OS/2 UGL font.

OEM_CHARSET : CharSet for Windows OEM Codepages

If the SystemOEMCp is one of SBCS codepage, and:

GlyphListName = "PM383", "PMJPN", "PMKOR", "PMKS", "PMTWN", "PMBIG5", "PMPRC" , "PMGB" or "UNICODE"
GlyphListName = NULL, and usCodePage = 0
GlyphListName = NULL, and usCodePage = SystemOEMCp

OEM_CHARSET : CharSet for Windows ANSI/OEM Common Codepages

If one of following:

ANSI CharSet = THAI_CHARSET, and SystemOEMCp = 874
ANSI CharSet = SHIFTJIS_CHARSET, and SystemOEMCp = 932, 942 or 943
ANSI CharSet = HANGEUL_CHARSET, and SystemOEMCp = 949
ANSI CharSet = JOHAB_CHARSET, and SystemOEMCp = 1361
ANSI CharSet = CHINESEBIG5_CHARSET, and SystemOEMCp = 950
ANSI CharSet = GB2312_CHARSET, and SystemOEMCp =  936 (Windows GB codepage, not OS/2 GB codepage)

Note: SystemOEMCp (System OEM Codepage) should be obtained with GetLocaleInfo Open32 function with LOCALE_IDEFAULTCODEPAGE for LOCALE_SYSTEM_DEFAULT.

Fonts for Scripting Text (of Uncertain CharSet)

If the font is none of above, the fonts contains uncertain set of glyphs in uncertain order. In this case, the font should be categorized as device / platform dependent OEM CharSet.

OEM_CHARSET : OEM Font (None of above)

GlyphListName = NULL, and usCodePage = any