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Update CONTRIBUTING.md

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Minjae Song
2018-12-02 02:35:58 +09:00
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parent d8dd88c6a7
commit dfeab56bb5
1 changed files with 17 additions and 13 deletions
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CONTRIBUTING.md
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@@ -42,15 +42,15 @@ Green-tinted area (should be 10 px tall) contains the tags. Tags are defined as
```
(LSB) 0 == Use Compiler Directive (Undefined right now, keep it as 0)
1 -+ 1 | Align to this X pos of prev char,
1 | 2 | only valid if write-on-top is 1
1 | 4 | and is centre-aligned and non-zero
1 -+ 8 | (if this is zero, floorOf(width/2) will be used instead)
0 -+ 0 Align 1 Align 0 Align 1 Align before
1 -+ 0 left 0 right 1 centre 1 the glyph
1 == write-on-top, usually it's diatritics but some are not (e.g. devanagari vowel sign O)
1 == 0 Stack 1 Stack 0 Before 1 Up &
(MSB) 0 == 0 up 0 down 1 &After 1 Down (e.g. U+0C48)
1 -, 1 = Align to this X pos of prev char,
1 | 2 = only valid if write-on-top is 1
1 | 4 = and is centre-aligned and non-zero
1 -' 8 = (if this is zero, floorOf(width/2) will be used instead)
0 -, 0 Align 1 Align 0 Align 1 Align before
1 -' 0 left 0 right 1 centre 1 the glyph
1 == write-on-top, usually it's diatritics but not always (e.g. devanagari vowel sign O)
1 -, 0 Stack 1 Stack 0 Before 1 Up &
(MSB) 0 -' 0 up 0 down 1 &After 1 Down (e.g. U+0C48)
```
#### Stack Up/Down
@@ -60,7 +60,7 @@ character is lowercase.
#### Align-To-This-X-Pos
Since this tag does not make sense for diacritics, they will use the value for compeletely different perporse:
Since this tag does not make sense for diacritics, they will use the value for compeletely different purpose:
0 : Nothing special
1 : Covers previous character; it's neither stack-up nor down.
@@ -76,7 +76,7 @@ To implement those, this two extra code points are needed, which are provided in
For working examples, take a note at the bengali sprite sheet.
This tag can be used as a general "replace this with these" directive, as long as you're replacing it into two letters. (e.g. U+0B94; TAMIL LETTER AU, which is a combination of U+0B92 and U+0BD7
This tag can be used as a general "replace this with these" directive, as long as you're replacing it into two letters. This directive is exploited to construct dutch ligature "IJ" (U+0132 and U+0133), in the sheet LatinExtA.
Also note that the font compiler will not "stack" these diacritics.
@@ -101,12 +101,16 @@ On this font, Hangul letters are printed by assemblying two or three letter piec
This is a Kotlin-like pseudocode for assembling the glyph:
// NOTE: this code implements modern Hangul only, in the unicode range of 0xAC00..0xD7A3.
// the spritesheet is made to accomodate Johab encoding scheme, but can still be used with the following code.
// for the code for full Johab encoding (U+1100.. that includes Old Korean), please refer to the actual code in the repo.
function getHanChosung(hanIndex: Int) = hanIndex / (21 * 28)
function getHanJungseong(hanIndex: Int) = hanIndex / 28 % 21
function getHanJongseong(hanIndex: Int) = hanIndex % 28
jungseongWide = arrayOf(8, 12, 13, 17, 18, 21)
jungseongComplex = arrayOf(9, 10, 11, 14, 15, 16, 22)
jungseongWide = arrayOf(9,13,14,18,19)
jungseongComplex = arrayOf(10,11,12,15,16,17,20,23)
function getHanInitialRow(hanIndex: Int): Int {
val ret: Int