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// SPDX-License-Identifier: Unlicense OR MIT
package text
import (
"io"
"gioui.org/op"
"golang.org/x/image/math/fixed"
)
// A Line contains the measurements of a line of text.
type Line struct {
Layout []Glyph
// Len is the length in UTF8 bytes of the line.
Len int
// Width is the width of the line.
Width fixed.Int26_6
// Ascent is the height above the baseline.
Ascent fixed.Int26_6
// Descent is the height below the baseline, including
// the line gap.
Descent fixed.Int26_6
// Bounds is the visible bounds of the line.
Bounds fixed.Rectangle26_6
}
type Glyph struct {
Rune rune
Advance fixed.Int26_6
}
// Style is the font style.
type Style int
// Weight is a font weight, in CSS units.
type Weight int
// Font specify a particular typeface variant, style and weight.
type Font struct {
Typeface Typeface
Variant Variant
Style Style
// Weight is the text weight. If zero, Normal is used instead.
Weight Weight
}
// Face implements text layout and shaping for a particular font.
type Face interface {
Layout(ppem fixed.Int26_6, maxWidth int, txt io.Reader) ([]Line, error)
Shape(ppem fixed.Int26_6, str []Glyph) op.CallOp
}
// Typeface identifies a particular typeface design. The empty
// string denotes the default typeface.
type Typeface string
// Variant denotes a typeface variant such as "Mono" or "Smallcaps".
type Variant string
type Alignment uint8
const (
Start Alignment = iota
End
Middle
)
const (
Regular Style = iota
Italic
)
const (
Normal Weight = 400
Medium Weight = 500
Bold Weight = 600
)
func (a Alignment) String() string {
switch a {
case Start:
return "Start"
case End:
return "End"
case Middle:
return "Middle"
default:
panic("unreachable")
}
}
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