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https://github.com/curioustorvald/Terrarum-sans-bitmap.git
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118 lines
3.1 KiB
Plaintext
118 lines
3.1 KiB
Plaintext
--- Pixel 0
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- Lowheight bit
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- encoding: has pixel - it's low height
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- used by the diacritics system to quickly look up if the character is low height without parsing the Pixel 1
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### Legends
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#
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# A·B < unset for lowheight miniscules, as in e
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# |·| < space we don't care
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# C·D < middle hole for majuscules, as in C
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# E·F < middle hole for miniscules, as in c
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# G·H
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# ――― < baseline
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# |·|
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# J·K
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--- Pixel 1
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- A..K Occupied (1024)
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- Is ABGH are all Ys instead of Bars? (2)
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- Say, A is Bar but E is wye (e.g. Ꮨ), this condition is false; this character must be encoded as ABDFGH(B).
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- encoding:
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- <MSB> Y0000000 JK000000 ABCDEFGH <LSB>
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- Y: Bar/Wye Mode
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- A..K: arguments
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- B-type will contract the space by 2 pixels, while Y-type will do it by 1
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# Capital/lower itself is given using the pixel 0 due to the diacritics processing
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--- Examples
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- AB(B): T
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- ABCEGH(B): C
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- ABCEFGH(Y): K
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- ABCDEG: Ꮅ
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- ABCDEFGH: B,D,O
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- ABCDFH: Ч
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- ABCEG: Г
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- ABGH: Ꮖ
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- ACDEG: Ꮀ
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- ACDEFGH: h,Ƅ
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- ACDFH: ߆
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- ACEGH: L
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- AH(Y): \
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- BDEFGH: J
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- BDFGH: ɺ,ป
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- BG(Y): /
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- CD: Ⴕ
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- CDEF(Y): Φ
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- CDEFGH: a,c,e,i,o,φ,ϕ
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- CDEFGHJK: g
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- CDEFGHK: ƞ
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- AB(Y): Y
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- ABCD(Y): V
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- CDEF(Y): v
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- EFGH(Y): ʌ
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- CDGH(Y): A
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--- Rules
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# Legend: _ dont care
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# @ must have a bit set
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# ` must have a bit unset
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- ͟A͟B͟C͟D͟E͟F͟G͟H͟J͟K͟ ͟ ͟ ͟A͟B͟C͟D͟E͟F͟G͟H͟J͟K͟
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- _@_`___`__ — `_________ # Γe,TJ ; Ye,YJ,Ve,VJ,TA,ΓA,VA,Vʌ,YA,Yʌ,yA,yʌ,/a,/d
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- _@_@___`__ — `___`_@___ # Pɺ but NOT Po,PJ
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- _@_@___`__ — `___@_____ # Fo,PJ (always 1 px)
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- ___`_`____ — `___@_`___ # Cꟶ,Kꟶ,Lꟶ,Γꟶ
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- ___`_`____ — `_@___`___ # CꟵ,KꟵ,LꟵ,ΓꟵ
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-----------------------------------------------------
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- _`________ — @_`___`___ # eꞀ,LT ; eY,LY,eV,LV,AT,AꞀ,AY,Ay,λY,λy,a\,b\
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- _`___`_@__ — @_@___`___ # Lꟼ but NOT oꟼ,bꟼ
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- _`___@____ — @_@___`___ # oꟼ,bꟼ (always 1 px)
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- _`___@_`__ — __`_`_____ # ⱶƆ,ⱶJ
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- _`_@___`__ — __`_`_____ # ⱵƆ,ⱵJ
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--- Implementation
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code: |
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val posTable = intArrayOf(7,6,5,4,3,2,1,0,9,8)
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class RuleMask(s: String) {
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private var careBits = 0
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private var ruleBits = 0
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init {
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s.forEachIndexed { index, char ->
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when (char) {
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'@' -> {
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careBits = careBits or (1 shl posTable[index])
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ruleBits = ruleBits or (1 shl posTable[index])
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}
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'`' -> {
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careBits = careBits or (1 shl posTable[index])
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}
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}
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}
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}
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fun matches(shapeBits: Int) = ((shapeBits and careBits) and ruleBits) == 0
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}
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--- Pixel 2
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Glyph pos for up/down diacritics
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- U: X-position for stack-up diacritics
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- D: X-position for stack-down diacritics
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- encoding:
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- <MSB> 00000000 100DDDDD 100UUUUU <LSB>
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- If either U/D is unused, centre position will be used.
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- Diacritics will be centred on the x-position this parameter points to
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--- Pixel 3
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dot removal for diacritics:
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- All 24 bits are used to put replacement character
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- encoding:
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- <MSB> RRRRRRRR GGGGGGGG BBBBBBBB <LSB>
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