Appendix B – Calculation of font (FTC) and language (LID)

Certain Unicode characters are shared between Far East and non-Far East scripts requiring the calculation of font and language based on the Unicode character code and the chp.idctHint property.

Characters are classified into one of four groups, ASCII, Far East, floating, and non-Far East. Properties are calculated as follows:

Character type

Font (ftc)

Language (lid)

ASCII

sprmCRgftc0

sprmCRglid0

non-Far East

sprmCRgftc2

sprmCRglid0

Far East

sprmCRgftc1

sprmCRglid1

shared character

sprmCRgftc2 if chp.idctHint is 0
sprmCRgftc1 if chp.idctHint is 1

sprmCRglid0 if chp.idctHint is 0

sprmCRglid1 if chp.idctHint is 1


The table below defines the classification of various ranges of Unicode characters:

Unicode subrange

character range

Classification

usrBasicLatin

 0x20->0x7f

ASCII

usrLatin1

 0xa0->0xff

some shared (see notes below)

usrLatinXA

 0x100->0x17f

some shared (see notes below)

usrLatinXB

 0x180->0x24f

some shared (see notes below)

usrIPAExtensions

 0x250->0x2af

some shared (see notes below)

usrSpacingModLetters

 0x2b0->0x2ff

Shared

usrCombDiacritical

 0x300->0x36f

Shared

usrBasicGreek

 0x370->0x3cf

Shared

usrGreekSymbolsCop

 0x3d0->0x3ff

non-Far East

usrCyrillic

 0x400->0x4ff

Shared

usrArmenian

 0x500->0x58f

non-Far East

usrBasicHebrew

 0x5d0->0x5ff

non-Far East

usrHebrewXA

 0x590->0x5cf

non-Far East

usrBasicArabic

 0x600->0x652

non-Far East

usrArabicX

 0x653->0x6ff

non-Far East

usrDevangari

 0x900->0x97f

non-Far East

usrBengali

 0x980->0x9ff

non-Far East

usrGurmukhi

 0xa00->0xa7f

non-Far East

usrGujarati

 0xa80->0xaff

non-Far East

usrOriya

 0xb00->0xb7f

non-Far East

usrTamil

 0x0b80->0x0bff

non-Far East

usrTelugu

 0x0c00->0x0c7f

non-Far East

usrKannada

 0x0c80->0x0cff

non-Far East

usrMalayalam

 0x0d00->0x0d7f

non-Far East

usrThai

 0x0e00->0x0e7f

non-Far East

usrLao

 0x0e80->0x0eff

non-Far East

usrBasicGeorgian

 0x10d0->0x10ff

non-Far East

usrGeorgianExtended

 0x10a0->0x10cf

non-Far East

usrHangulJamo

 0x1100->0x11ff

non-Far East

usrLatinExtendedAdd

 0x1e00->0x1eff

Shared

usrGreekExtended

 0x1f00->0x1fff

non-Far East

usrGeneralPunct

 0x2000->0x206f

Shared

usrSuperAndSubscript

 0x2070->0x209f

Shared

usrCurrencySymbols

 0x20a0->0x20cf

Shared

usrCombDiacriticsS

 0x20d0->0x20ff

Shared

usrLetterlikeSymbols

 0x2100->0x214f

Shared

usrNumberForms

 0x2150->0x218f

Shared

usrArrows

 0x2190->0x21ff

Shared

usrMathematicalOps

 0x2200->0x22ff

Shared

usrMiscTechnical

 0x2300->0x23ff

Shared

usrControlPictures

 0x2400->0x243f

Shared

usrOpticalCharRecog

 0x2440->0x245f

Shared

usrEnclosedAlphanum

 0x2460->0x24ff

Shared

usrBoxDrawing

 0x2500->0x257f

Shared

usrBlockElements

 0x2580->0x259f

Shared

usrGeometricShapes

 0x25a0->0x25ff

Shared

usrMiscDingbats

 0x2600->0x26ff

Shared

usrDingbats

 0x2700->0x27bf

Shared

usrCJKSymAndPunct

 0x3000->0x303f

Far East

usrHiragana

 0x3040->0x309f

Far East

usrKatakana

 0x30a0->0x30ff

Far East

usrBopomofo

 0x3100->0x312f

Far East

usrHangulCompatJamo

 0x3130->0x318f

Far East

usrCJKMisc

 0x3190->0x319f

Far East

usrEnclosedCJKLtMnth

 0x3200->0x32ff

Far East

usrCJKCompatibility

 0x3300->0x33ff

Far East

usrHangul

 0xac00->0xd7a3

Far East

usrReserved1

usrReserved2

usrCJKUnifiedIdeo

 0x4e00->0x9fff

Far East

usrPrivateUseArea

 0xe000->0xf8ff

Shared

usrCJKCompatibilityIdeographs

 0xf900->0xfaff

Far East

usrAlphaPresentationForms

 0xfb00->0xfb4f

Shared

usrArabicPresentationFormsA

 0xfb50->0xfdff

Shared

usrCombiningHalfMarks

 0xfe20->0xfe2f

Far East

usrCJKCompatForms

 0xfe30->0xfe4f

Far East

usrSmallFormVariants

 0xfe50->0xfe6f

Far East

usrArabicPresentationFormsB

 0xfe70->0xfefe

Shared

usrHFWidthForms

 0xff00->0xffef

Far East

usrSpecials

 0xfff0->0xfffd

non-Far East


The table below describes the behavior of the unicode subrange usrLatin1. Shared characters are marked in this table with a 1, while characters marked with a 0 are considered "non-Far East". All other characters in this unicode subrange are considered "non-Far East".

// 0 1 2 3 4 5 6 7 8 9 a b c d e f

0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, // 0x00a0-0x00af

1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, // 0x00b0-0x00bf

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x00c0-0x00cf

0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, // 0x00d0-0x00df

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x00e0-0x00ef

0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, // 0x00f0-0x00ff

};

The table below describes the behavior of the unicode range usrLatinXA. Shared characters are marked in this table with a 1, while characters marked with a 0 are considered "non-Far East". All other characters in this unicode subrange are considered "non-Far East".

// 0 1 2 3 4 5 6 7 8 9 a b c d e f

1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0100-0x010f

0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, // 0x0110-0x011f

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, // 0x0120-0x012f

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0130-0x013f

0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, // 0x0140-0x014f

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x0150-0x015f

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, // 0x0160-0x016f

In usrLatinXB shared characters are 0x192, 0x1FA, 0x1FB, 0x1FC, 0x1FD, 0x1FE and 0x1FF. All other characters in this unicode subrange are considered "non-Far East".

In usrIPAExtensions shared characters are 0x251, and 0x261.

An optimization is available. If the Far East font chp.ftcFE is 0 and chp.idctHint is 0 and chp.ftcAscii is equal to chp.ftcOther, the font is chp.ftcAscii and the language is chp.lidDefault.