fnt

package

v0.1.0 Latest Latest Go to latest Published: Jun 14, 2026 License: MIT Imports: 6 Imported by: 0

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Valid go.mod file
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Repository

github.com/coreprime/kbot

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Documentation ¶

Overview ¶

Package fnt implements reading of Total Annihilation bitmap font files.

FNT files contain 1-bit-per-pixel glyph data for up to 256 characters. Format:

2 bytes: uint16 glyph height (all glyphs share the same height)
2 bytes: uint16 unknown/flags
256 × 2 bytes: uint16 offset table (offset from file start to each glyph, 0 = not present)
Glyph data: for each glyph at its offset:
1 byte: pixel width
ceil(width * height / 8) bytes: 1bpp pixel data, MSB-first continuous bit stream

Index ¶

func WritePNG(w io.Writer, img image.Image) error
type Font
- func LoadFromReader(r io.ReadSeeker) (*Font, error)
type Glyph
- func (g *Glyph) RenderImage(fg, bg color.Color) *image.RGBA

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

func WritePNG ¶

func WritePNG(w io.Writer, img image.Image) error

WritePNG encodes an image to PNG.

Types ¶

type Font ¶

type Font struct {
	Height int         // Glyph height in pixels
	Flags  uint16      // Unknown flags field
	Glyphs [256]*Glyph // Glyph for each character (nil if not present)
}

Font is a parsed FNT file.

func LoadFromReader ¶

func LoadFromReader(r io.ReadSeeker) (*Font, error)

LoadFromReader parses an FNT file.

func (*Font) GlyphCount ¶

func (f *Font) GlyphCount() int

GlyphCount returns the number of defined glyphs.

func (*Font) RenderSheet ¶

func (f *Font) RenderSheet(fg, bg color.Color) *image.RGBA

RenderSheet renders all glyphs as a sprite sheet (16 columns).

func (*Font) RenderText ¶

func (f *Font) RenderText(text string, fg, bg color.Color) *image.RGBA

RenderText renders a string using this font.

type Glyph ¶

type Glyph struct {
	Char   int    // Character code (0-255)
	Width  int    // Pixel width
	Height int    // Pixel height (same as font height)
	Pixels []bool // Width × Height pixel values (true = set)
}

Glyph is a single character's bitmap data.

func (*Glyph) RenderImage ¶

func (g *Glyph) RenderImage(fg, bg color.Color) *image.RGBA

RenderGlyph renders a single glyph as an RGBA image.

Source Files ¶

View all Source files

fnt.go

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