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Devanagari BETA; broke Thai diacritics again

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minjaesong
2018-08-10 01:29:58 +09:00
parent 4a36d3e7f1
commit a0e2cbf756
12 changed files with 196 additions and 184 deletions
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CONTRIBUTING.md
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@@ -15,7 +15,7 @@ Red-tinted area SHOULD NOT CONTAIN any dots, it's emptied for compatibility. (Sl
Blue-tinted area cotains width of the glyph in binary, uppermost dot is the Least Significant Bit.
Green-tinted area contains extra informations, left blank for most cases. (will be expanded later; no standard has been issued yet)
Green-tinted area contains extra informations, left blank for most cases. We'll call it Glyph Tags.
Tinted-in-magenta shows the height where diacritics should be placed, for both uppercase and lowercase.
@@ -24,7 +24,7 @@ Each cell is 16 px wide, and any glyph you draw **must be contained within lefts
### Font metrics
### Font Metrics
Although the font is basically a Spritesheet, some of the sheet expects variable widths to be supported. Any sheets with ```_variable``` means it expects variable widths. Anything else expects fixed width (regular Spritesheet behaviour). ```cjkpunct``` has width of 10, ```kana``` and ```hangul_johab``` has width of 12, ```wenquanyi``` has width of 16.
@@ -34,6 +34,27 @@ Although the font is basically a Spritesheet, some of the sheet expects variable
Width is encoded in binary bits, on pixels. On the font spritesheet, every glyph has vertical dots on their top-right side (to be exact, every (16k - 1)th pixel on x axis). Above image is a sample of the font, with width information coloured in magenta. From top to bottom, each dot represents 1, 2, 4 and 8. For example, in the above image, ! (exclamation mark) has width of 5, " (double quote) has width of 6, # (octothorp) has width of 8, $ (dollar sign) has width of 9.
### Glyph Tagging System
Green-tinted area (should be 10 px tall) contains the tags. Tags are defined as following:
```
(LSB) 0 == RTL
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 -+ 0 left 0 right 1 Centre
0 == Write on top of prev chars (e.g. diacritics)
1 == Diacritics stack 0:upward/1:downward
(MSB) 0 == Diacritics comes befor the glyph
NOTE: if glyphs are right or centre aligned, they must be aligned in the same way
inside of the bitmap; the program assumes every variable-width glyphs to have
a width of 15, regardless of the tagged width.
```
### Implementing the Korean writing system
On this font, Hangul letters are printed by assemblying two or three letter pieces. There are 10 sets of Hangul letter pieces on the font. Top 6 are initials, middle 2 are medials, and bottom 2 are finals. On the rightmost side, there's eight assembled glyphs to help you with (assuming you have basic knowledge on the writing system). Top 6 tells you how to use 6 initials, and bottom 2 tells you how to use 2 finals.