blooblib/font.go

package bloob

import _ "embed"

type ch struct {
	xForward int
	image    *Image
}

type Font struct {
	chars      []ch
	lineHeight int
}

//go:embed "font.png"
var fontdata []byte
var DefaultFont = LoadTilesetFontBytes(fontdata, Vec2i{X: 8, Y: 14})

//go:embed "font-thin.png"
var fontdataThin []byte
var DefaultFontThin = LoadTilesetFontBytes(fontdataThin, Vec2i{X: 6, Y: 8})

func LoadTilesetFontBytes(data []byte, tilesize Vec2i) *Font {
	tiles := LoadImageBytes(data).MakeTileset(tilesize)
	var font Font
	for i := 0; i < len(tiles); i += 1 {
		c := ch{xForward: tilesize.X, image: tiles[i]}
		font.chars = append(font.chars, c)
	}
	font.lineHeight = tilesize.Y + 2
	return &font
}

func (f *Font) StringWidth(str string) int {
	var l int
	for i := 0; i < len(str); i += 1 {
		l += f.chars[i].xForward
	}
	return l - 1
}

func (f *Font) StringBounds(str string) Vec2i {
	//todo: multiline

	return Vec2i{X: f.StringWidth(str), Y: f.lineHeight}
}