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Filename : TIBT-OTF.flt
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;; TIBT-OTF.flt -- Font Layout Table for Tibetan (OpenType font)
;; Copyright (C) 2005, 2007  AIST (H15PRO112)
;; See the end for copying conditions.

(font layouter tibt-otf nil
      (font (nil nil unicode-bmp :otf=tibt=ccmp,blws,abvs)))

;;; <li> TIBT-OTF.flt
;;;
;;; For TibetanMachineUniAlpha.ttf to draw Tibetan script.
;;; The font is available at:
;;; <ul>
;;; <li> debian package: ttf-tmuni
;;; </ul>

;; Step 0: Reordering Characters
;;
;; According to the Unicode canonical combining class value (CCCV),
;; Tibetan combining characters must be orderd in the following way:
;;
;; MARK HALANTA (CCCV=9)
;; VOWEL SIGN AA (129)
;; Above base vowel signs (130)
;; VOWEL SIGN U (132)
;; MARK TSA -PHRU (216)
;;
;; However, the current font expects the following order:
;;
;; MARK TSA -PHRU
;; VOWEL SIGN AA
;; VOWEL SIGN U
;; MARK HALANTA
;; Above base vowel signs

(category
 (0x0F00 0x0FCF		?x)		; default
 (0x0F39		?T)		; MARK TSA -PHRU
 (0x0F71		?A)		; VOWEL SIGN AA
 (0x0F72		?V)		; VOWEL SIGN I
 (0x0F74		?U)		; VOWEL SIGN U
 (0x0F7A 0x0F7D		?V)		; VOWEL SIGN E .. VOWEL SIGN OO
 (0x0F80		?V)		; VOWEL SIGN REVERSED I
 (0x0F84		?H))		; MARK HALANTA

(generator
 (0
  (cond
   ("x+"
    = *)
   ("(H?)(A*)(V?)(U*)(T?)"
    (5 =) (2 = *) (4 = *) (1 =) (3 =)))
  *))

;; Step 1: Syllable identification

;; C: Consonants
;; T: MARK TSA -PHRU
;; c: Subjoind consonants
;; A: VOWEL SIGN AA
;; U: VOWEL SIGN U
;; H: MARK HALANTA
;; V: Above or two-part vowel signs
;; S: Above base signs
;; s: Other above base signs
;; x: Others

(category
 (0x0F00 0x0FCF		?x)		; default
 (0x0F39		?T)		; MARK TSA -PHRU
 (0x0F40 0x0F6A		?C)		; LETTER KA .. LETTER FIXED-FORM RA
 (0x0F71		?A)		; VOWEL SIGN AA
 (0x0F72 0x0F7E		?V)		; VOWEL SIGN I .. SIGN RJES SU NGA RO
 (0x0F74		?U)		; VOWEL SIGN U
 (0x0F80 0x0F81		?V)		; VOWEL SIGN REVERSED I, REVERSED II
 (0x0F82 0x0F83		?S)		; SIGN NYI ZLA NAADA, SIGN SNA LDAN
 (0x0F84		?H)		; MARK HALANTA
 (0x0F86 0x0F87		?s)		; SIGN LCI RTAGS, SIGN YANG RTAGS
 (0x0F88 0x0F89		?C)		; SIGN LCE TSA CAN, SIGN MCHU CAN
 (0x0F90 0x0FBC		?c))		; SUBJOIND LETTER KA .. FIXED-FORM RA

(generator
 (0
  (cond
   ;; For some reason, it is better not to apply the abvs feature when
   ;; both A and U exist.
   ("(C)(T?)(c*)(A*)(U*)(H?)(V*)(S*)(s*)"
    < otf:tibt=ccmp,blws,abvs >)
   ("."
    =))
  *))

;; Copyright (C) 2005, 2007
;;   National Institute of Advanced Industrial Science and Technology (AIST)
;;   Registration Number H15PRO112

;; This file is part of the m17n database; a sub-part of the m17n
;; library.

;; The m17n library is free software; you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public License
;; as published by the Free Software Foundation; either version 2.1 of
;; the License, or (at your option) any later version.

;; The m17n library is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;; Lesser General Public License for more details.

;; You should have received a copy of the GNU Lesser General Public
;; License along with the m17n library; if not, write to the Free
;; Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;; Local Variables:
;; mode: lisp
;; coding: utf-8
;; End: