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Updated bffnt.md to fix kerning documentation. #17

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Updated bffnt.md to fix kerning documentation. #17

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26 changes: 18 additions & 8 deletions src/libs/nw/bffnt.md
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Expand Up @@ -118,20 +118,30 @@ The first and last character code in the section header are ignored.
| ... | ... | ... |

## Kerning Section
Offsets the horizontal position of glyphs. Positive is right, negative is left. (Pixel Based)
Kerning for Glyphs not listed default to 0.
Stores an array of Kerning pairs.

| Offset | Size | Description |
| --- | --- | --- |
| 0x0 | 4 | Identifier ("KRNG") |
| 0x4 | 4 | Section size |
| 0x8 | | Kerning Data |
| 0x8 | 2 | Number of Kerning FirstWord Entries |
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Can we come up with a better name for FirstWord and SecondWord?

| 0xA| | Kerning FirstWord Data |
| | | Kerning SecondWord Data |

### Kerning FirstWord Data
The offset starts at 0x08 of the KRNG section.
Actual offset to SecondWord is 2x what's stored.

### Kerning Data
| Offset | Size | Description |
| --- | --- | --- |
| 0x2 | 2 | Character Code 1 |
| 0x4 | 2 | Horizontal Offset for Glyph 1 |
| 0x6 | 2 | Character Code 2 |
| 0x8 | 2 | Horizontal Offset for Glyph 2 |
| 0x2 | 2 | Character code |
| 0x4 | 2 | Offset to its SecondWord entries |
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Since 'entries' is plural, how many SecondWord entries does each FirstWord entry refer to?

| ... | ... | ... |
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What do these dots mean?


### Kerning SecondWord Data
Positive offset moves the character to the right, negative to the left. (Pixel Based)

| Offset | Size | Description |
| --- | --- | --- |
| 0x0 | 2 | Character code |
| 0x1 | 2 | Character offset |
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Shouldn't the character offset be at offset 0x2, since the size of the character code is 2 bytes?