Bffnt

Binary Cafe Font. nn::font in addition to supporting Open Type Fonts supports this custom bitmap font file format.

Header

Standard ui2d header.

There are 5 section types, Font Information (FINF), Texture Glyph (TGLP), Character Width (CWDH), Code Map (CMAP), and Kerning (KRNG).

Font Information

Offset	Size	Type	Description
0x0	0x8	Ui2d Section Header	Magic: "FINF"
0x8	0x1	u8	Font Type
0x9	0x1	u8	Height
0xa	0x1	u8	Width
0xb	0x1	u8	Ascent
0xc	0x2	u16	Line Feed
0xe	0x2	u16	Alternate Character Index
0x10	0x3	CharacterWidthData	Default Character Widths
0x13	0x1	u8	Character Encoding
0x14	0x4	u32	Texture Glyph Offset (TGLP)
0x18	0x4	u32	Character Width Offset (CWDH)
0x1c	0x4	u32	Code Map Offset (CMAP)

Font Type

Name	Enum Value	Description
Glyph	0x0
Texture	0x1	Not witnessed by author
PackedTexture	0x2	Not witnessed by author

Character Encoding

Name	Enum Value	Description
Utf16	0x0
ShiftJis	0x1
CP1252	0x2

Character Width Data

Offset	Size	Type	Description
0x0	0x1	s8	Left Width
0x1	0x1	u8	Glyph Width
0x2	0x1	u8	Character Width

Texture Glyph

Offset	Size	Type	Description
0x0	0x8	Ui2d Section Header	Magic: "TGLP"
0x8	0x1	u8	Cell Width
0x9	0x1	u8	Cell Height
0xa	0x1	u8	Texture Count
0xb	0x1	u8	Max Character Width
0xc	0x4	u32	Per Texture Size
0x10	0x2	u16	Baseline Position
0x12	0x2	u16	Image Format
0x14	0x2	u16	Cells Per Row
0x16	0x2	u16	Cells Per Column
0x18	0x2	u16	Image Width
0x1a	0x2	u16	Image Height
0x1c	0x4	u32	Image Data Offset (Bntx)

Image Format

Name	Enum Value	Description
R8G8B8A8_Unorm	0x0
R8G8B8_Unorm	0x1
R5G5B5A1_Unorm	0x2
R5G6B5_Unorm	0x3
R4G4B4A4_Unorm	0x4
LA8_Unorm	0x5
LA4_Unorm	0x6
A4_Unorm	0x7
A8_Unorm	0x8
BC1_Unorm	0x9
BC2_Unorm	0xa
BC3_Unorm	0xb
BC4_Unorm	0xc
BC5_Unorm	0xd
R8G8B8A8_SRGB	0xe
BC1_SRGB	0xf
BC2_SRGB	0x10
BC3_SRGB	0x11
BC7_Unorm	0x12
BC7_SRGB	0x13

Character Width

Offset	Size	Type	Description
0x0	0x8	Ui2d Section Header	Magic: "CWDH"
0x8	0x2	u16	First Entry Index
0xa	0x2	u16	Last Entry Index
0xc	0x4	u32	Next Character Width Offset (CWDH)
0x10	0x3	CharacterWidthData	Character Width Array

Code Map

Offset	Size	Type	Description
0x0	0x8	Ui2d Section Header	Magic: "CMAP"
0x8	0x4	u32	Code Range Begin
0xc	0x4	u32	Code Range End
0x10	0x2	u16	Map Method
0x12	0x2	u16	Unknown/Reserved
0x14	0x4	u32	Next Code Map Offset (CMAP)
0x18	0x2 0x2 * Range 0x4 + 0x4 * Range	Direct Table Scan	See below

Code Map Method

Name	Enum Value	Description
Direct	0x0
Table	0x1
Scan	0x2

Direct

Offset	Size	Type	Description
0x0	0x2	u16	Base Character

Table

Offset	Size	Type	Description
0x0	0x2 * Range	u16	Character

Scan

Offset	Size	Type	Description
0x0	0x2	u16	Scan Half Count
0x2	0x2	u16	Unknown/Reserved
0x4	0x4 * Range	ScanEntry	Scan Entry Array (sorted)

Scan Entry

Offset	Size	Type	Description
0x0	0x2	u16	Key
0x2	0x2	u16	Code

Kerning (TODO)

This section has not yet been witnessed by author.