coredevices · ninefyi · Aug 4, 2026 · Aug 26, 2026 · Aug 26, 2026 · Aug 29, 2026
@@ -38,7 +38,8 @@ unrelated runtime struct).
 - bit 0: glyph-table offsets are `uint16_t` if set, `uint32_t` if clear.
   The generator sets it when the glyph table fits in 64 KiB.
 - bit 1: glyph bitmaps are RLE4-compressed if set, plain bitmaps if clear.
-- bits 2–7: reserved.
+- bit 2: glyph records may include embedded GPOS anchor payloads.
+- bits 3–7: reserved.
 
 ## Hash table
 
@@ -83,6 +84,19 @@ Bitmap data is 1 bit per pixel: rows are concatenated unaligned into one
 continuous bit stream, packed LSB-first into 32-bit words and zero-padded
 to a multiple of 4 bytes.
 
+When feature bit 2 is set, a glyph may include an optional embedded anchor
+payload immediately after the aligned bitmap data. The current payload format
+is:
+
+- 2 bytes magic: `GA`
+- 1 byte payload version (currently 1)
+- 1 byte entry count
+- repeated entries: `uint16 mark_codepoint`, `int16 dx_fu`, `int16 dy_fu`
+
+`dx_fu`/`dy_fu` are signed font-unit offsets derived from GPOS MarkBasePos and
+MarkMarkPos extraction. The firmware scales them to pixels at runtime using
+the rendered font's ppem and the source font's units-per-em value.
+
 RLE4 compression is a stream of 4-bit units, two per byte (low nibble
 first): each unit is `[symbol:1][length:3]`, emitting `length + 1`
 (1–8) copies of the symbol bit. An odd number of units is padded with a

@@ -1,6 +1,7 @@
 # Resource/font/image generation
 pillow
 freetype-py
+fonttools
 pypng
 svg.path
 bitarray

@@ -0,0 +1,93 @@
+Copyright 2018 The Sarabun Project Authors (https://github.com/cadsondemak/Sarabun)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.
@@ -0,0 +1,109 @@
+{
+    "strings": {
+        "lang": "th_TH",
+        "name": "STRINGS",
+        "file": "tintin.po"
+    },
+    "fonts": [{
+        "name": "GOTHIC_14_EXTENDED",
+        "file": "Sarabun-Regular.ttf",
+        "characterList": "thai_codepoints.json",
+        "pixelHeight": 12,
+        "extended": true,
+        "gposAnchors": true
+    }, {
+        "name": "GOTHIC_14_BOLD_EXTENDED",
+        "file": "Sarabun-Bold.ttf",
+        "characterList": "thai_codepoints.json",
+        "pixelHeight": 12,
+        "extended": true,
+        "gposAnchors": true
+    }, {
+        "name": "GOTHIC_18_EXTENDED",
+        "file": "Sarabun-Regular.ttf",
+        "characterList": "thai_codepoints.json",
+        "pixelHeight": 14,
+        "extended": true,
+        "gposAnchors": true
+    }, {
+        "name": "GOTHIC_18_BOLD_EXTENDED",
+        "file": "Sarabun-Bold.ttf",
+        "characterList": "thai_codepoints.json",
+        "pixelHeight": 14,
+        "extended": true,
+        "gposAnchors": true
+    }, {
+        "name": "GOTHIC_24_EXTENDED",
+        "file": "Sarabun-Regular.ttf",
+        "characterList": "thai_codepoints.json",
+        "pixelHeight": 17,
+        "extended": true,
+        "gposAnchors": true
+    }, {
+        "name": "GOTHIC_24_BOLD_EXTENDED",
+        "file": "Sarabun-Bold.ttf",
+        "characterList": "thai_codepoints.json",
+        "pixelHeight": 17,
+        "extended": true,
+        "gposAnchors": true
+    }, {
+        "name": "GOTHIC_28_EXTENDED",
+        "file": "Sarabun-Regular.ttf",
+        "characterList": "thai_codepoints.json",
+        "pixelHeight": 20,
+        "extended": true,
+        "gposAnchors": true
+    }, {
+        "name": "GOTHIC_28_BOLD_EXTENDED",
+        "file": "Sarabun-Bold.ttf",
+        "characterList": "thai_codepoints.json",
+        "pixelHeight": 20,
+        "extended": true,
+        "gposAnchors": true
+    }, {
+        "name": "GOTHIC_36_EXTENDED",
+        "file": "Sarabun-Regular.ttf",
+        "characterList": "thai_codepoints.json",
+        "pixelHeight": 20,
+        "extended": true,
+        "gposAnchors": true
+    }, {
+        "name": "GOTHIC_36_BOLD_EXTENDED",
+        "file": "Sarabun-Bold.ttf",
+        "characterList": "thai_codepoints.json",
+        "pixelHeight": 20,
+        "extended": true,
+        "gposAnchors": true
+    }, {
+        "name": "BITHAM_18_LIGHT_SUBSET_EXTENDED",
+        "file": ""
+    }, {
+        "name": "BITHAM_30_BLACK_EXTENDED",
+        "file": ""
+    }, {
+        "name": "BITHAM_34_LIGHT_SUBSET_EXTENDED",
+        "file": ""
+    }, {
+        "name": "BITHAM_34_MEDIUM_NUMBERS_EXTENDED",
+        "file": ""
+    }, {
+        "name": "BITHAM_42_BOLD_EXTENDED",
+        "file": ""
+    }, {
+        "name": "BITHAM_42_LIGHT_EXTENDED",
+        "file": ""
+    }, {
+        "name": "BITHAM_42_MEDIUM_NUMBERS_EXTENDED",
+        "file": ""
+    }, {
+        "name": "ROBOTO_CONDENSED_21_EXTENDED",
+        "file": ""
+    }, {
+        "name": "ROBOTO_BOLD_SUBSET_49_EXTENDED",
+        "file": ""
+    }, {
+        "name": "DROID_SERIF_28_BOLD_EXTENDED",
+        "file": ""
+    }],
+    "images": []
+}
@@ -0,0 +1,92 @@
+{
+    "notes": "Thai block (U+0E00-U+0E7F), assigned characters only: consonants/vowels/tone marks U+0E01-U+0E3A, currency symbol and remaining vowels/tone marks/digits/punctuation U+0E3F-U+0E5B. No presentation-forms shaping needed (unlike Arabic) since Thai combining marks stack via the font's own zero-advance-width metrics rather than contextual joining forms.",
+    "codepoints": [
+        3585,
+        3586,
+        3587,
+        3588,
+        3589,
+        3590,
+        3591,
+        3592,
+        3593,
+        3594,
+        3595,
+        3596,
+        3597,
+        3598,
+        3599,
+        3600,
+        3601,
+        3602,
+        3603,
+        3604,
+        3605,
+        3606,
+        3607,
+        3608,
+        3609,
+        3610,
+        3611,
+        3612,
+        3613,
+        3614,
+        3615,
+        3616,
+        3617,
+        3618,
+        3619,
+        3620,
+        3621,
+        3622,
+        3623,
+        3624,
+        3625,
+        3626,
+        3627,
+        3628,
+        3629,
+        3630,
+        3631,
+        3632,
+        3633,
+        3634,
+        3635,
+        3636,
+        3637,
+        3638,
+        3639,
+        3640,
+        3641,
+        3642,
+        3647,
+        3648,
+        3649,
+        3650,
+        3651,
+        3652,
+        3653,
+        3654,
+        3655,
+        3656,
+        3657,
+        3658,
+        3659,
+        3660,
+        3661,
+        3662,
+        3663,
+        3664,
+        3665,
+        3666,
+        3667,
+        3668,
+        3669,
+        3670,
+        3671,
+        3672,
+        3673,
+        3674,
+        3675
+    ]
+}