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text: remove String, Layout and add Glyph

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In preparation for using Shaper with an io.Reader, rework the API to not refer
to strings. In particular, introduce Glyph for holding the rune in addition to
the advance. For fast traversing of the underlying text, add Len to Line with
the UTF8 length.

Layout is a useless wrapper around []Line; remove it while we're
here.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2020-01-13 19:54:11 +01:00
parent e25b1639b9
commit 16d2a3ac0a
6 changed files with 95 additions and 116 deletions
Download Patch File Download Diff File Expand all files Collapse all files
font/opentype/opentype.go
+28 -30
View File
@@ -85,11 +85,11 @@ func (c *Collection) Font(i int) (*Font, error) {
return &Font{font: fnt}, nil
}
func (f *Font) Layout(ppem fixed.Int26_6, str string, opts text.LayoutOptions) *text.Layout {
func (f *Font) Layout(ppem fixed.Int26_6, str string, opts text.LayoutOptions) []text.Line {
return layoutText(&f.buf, ppem, str, &opentype{Font: f.font, Hinting: font.HintingFull}, opts)
}
func (f *Font) Shape(ppem fixed.Int26_6, str text.String) op.CallOp {
func (f *Font) Shape(ppem fixed.Int26_6, str []text.Glyph) op.CallOp {
return textPath(&f.buf, ppem, &opentype{Font: f.font, Hinting: font.HintingFull}, str)
}
@@ -98,7 +98,7 @@ func (f *Font) Metrics(ppem fixed.Int26_6) font.Metrics {
return o.Metrics(&f.buf, ppem)
}
func layoutText(buf *sfnt.Buffer, ppem fixed.Int26_6, str string, f *opentype, opts text.LayoutOptions) *text.Layout {
func layoutText(buf *sfnt.Buffer, ppem fixed.Int26_6, str string, f *opentype, opts text.LayoutOptions) []text.Line {
m := f.Metrics(buf, ppem)
lineTmpl := text.Line{
Ascent: m.Ascent,
@@ -110,18 +110,18 @@ func layoutText(buf *sfnt.Buffer, ppem fixed.Int26_6, str string, f *opentype, o
var lines []text.Line
maxDotX := fixed.I(opts.MaxWidth)
type state struct {
r rune
advs []fixed.Int26_6
adv fixed.Int26_6
x fixed.Int26_6
idx int
valid bool
r rune
layout []text.Glyph
adv fixed.Int26_6
x fixed.Int26_6
idx int
valid bool
}
var prev, word state
endLine := func() {
line := lineTmpl
line.Text.Advances = prev.advs
line.Text.String = str[:prev.idx]
line.Layout = prev.layout
line.Len = prev.idx
line.Width = prev.x + prev.adv
line.Bounds.Max.X += prev.x
lines = append(lines, line)
@@ -133,17 +133,17 @@ func layoutText(buf *sfnt.Buffer, ppem fixed.Int26_6, str string, f *opentype, o
c, s := utf8.DecodeRuneInString(str[prev.idx:])
a, valid := f.GlyphAdvance(buf, ppem, c)
next := state{
r: c,
advs: prev.advs,
idx: prev.idx + s,
x: prev.x + prev.adv,
adv: a,
valid: valid,
r: c,
layout: prev.layout,
idx: prev.idx + s,
x: prev.x + prev.adv,
adv: a,
valid: valid,
}
if c == '\n' {
// The newline is zero width; use the previous
// character for line measurements.
prev.advs = append(prev.advs, 0)
prev.layout = append(prev.layout, text.Glyph{Rune: c, Advance: 0})
prev.idx = next.idx
endLine()
continue
@@ -160,33 +160,32 @@ func layoutText(buf *sfnt.Buffer, ppem fixed.Int26_6, str string, f *opentype, o
}
next.x -= word.x + word.adv
next.idx -= word.idx
next.advs = next.advs[len(word.advs):]
next.layout = next.layout[len(word.layout):]
prev = word
endLine()
} else if k != 0 {
next.advs[len(next.advs)-1] += k
next.layout[len(next.layout)-1].Advance += k
next.x += k
}
next.advs = append(next.advs, next.adv)
if unicode.IsSpace(next.r) {
next.layout = append(next.layout, text.Glyph{Rune: c, Advance: next.adv})
if unicode.IsSpace(c) {
word = next
}
prev = next
}
endLine()
return &text.Layout{Lines: lines}
return lines
}
func textPath(buf *sfnt.Buffer, ppem fixed.Int26_6, f *opentype, str text.String) op.CallOp {
func textPath(buf *sfnt.Buffer, ppem fixed.Int26_6, f *opentype, str []text.Glyph) op.CallOp {
var lastPos f32.Point
var builder clip.Path
ops := new(op.Ops)
var x fixed.Int26_6
var advIdx int
builder.Begin(ops)
for _, r := range str.String {
if !unicode.IsSpace(r) {
segs, ok := f.LoadGlyph(buf, ppem, r)
for _, g := range str {
if !unicode.IsSpace(g.Rune) {
segs, ok := f.LoadGlyph(buf, ppem, g.Rune)
if !ok {
continue
}
@@ -232,8 +231,7 @@ func textPath(buf *sfnt.Buffer, ppem fixed.Int26_6, f *opentype, str text.String
}
lastPos = lastPos.Add(lastArg)
}
x += str.Advances[advIdx]
advIdx++
x += g.Advance
}
builder.End().Add(ops)
return op.CallOp{Ops: ops}
text/lru.go
+3 -3
View File
@@ -20,7 +20,7 @@ type pathCache struct {
type layoutElem struct {
next, prev *layoutElem
key layoutKey
layout *Layout
layout []Line
}
type path struct {
@@ -42,7 +42,7 @@ type pathKey struct {
const maxSize = 1000
func (l *layoutCache) Get(k layoutKey) (*Layout, bool) {
func (l *layoutCache) Get(k layoutKey) ([]Line, bool) {
if lt, ok := l.m[k]; ok {
l.remove(lt)
l.insert(lt)
@@ -51,7 +51,7 @@ func (l *layoutCache) Get(k layoutKey) (*Layout, bool) {
return nil, false
}
func (l *layoutCache) Put(k layoutKey, lt *Layout) {
func (l *layoutCache) Put(k layoutKey, lt []Line) {
if l.m == nil {
l.m = make(map[layoutKey]*layoutElem)
l.head = new(layoutElem)
text/shaper.go
+12 -25
View File
@@ -3,8 +3,6 @@
package text
import (
"unicode/utf8"
"golang.org/x/image/font"
"gioui.org/op"
@@ -14,8 +12,10 @@ import (
// Shaper implements layout and shaping of text.
type Shaper interface {
Layout(c unit.Converter, font Font, str string, opts LayoutOptions) *Layout
Shape(c unit.Converter, font Font, str String) op.CallOp
// Layout a text according to a set of options.
Layout(c unit.Converter, font Font, str string, opts LayoutOptions) []Line
// Shape a line of text previously laid out by Layout.
Shape(c unit.Converter, font Font, str string, layout []Glyph) op.CallOp
Metrics(c unit.Converter, font Font) font.Metrics
}
@@ -50,14 +50,14 @@ func (s *FontRegistry) Register(font Font, tf Face) {
}
}
func (s *FontRegistry) Layout(c unit.Converter, font Font, str string, opts LayoutOptions) *Layout {
func (s *FontRegistry) Layout(c unit.Converter, font Font, str string, opts LayoutOptions) []Line {
tf := s.faceForFont(font)
return tf.layout(fixed.I(c.Px(font.Size)), str, opts)
}
func (s *FontRegistry) Shape(c unit.Converter, font Font, str String) op.CallOp {
func (s *FontRegistry) Shape(c unit.Converter, font Font, str string, layout []Glyph) op.CallOp {
tf := s.faceForFont(font)
return tf.shape(fixed.I(c.Px(font.Size)), str)
return tf.shape(fixed.I(c.Px(font.Size)), str, layout)
}
func (s *FontRegistry) Metrics(c unit.Converter, font Font) font.Metrics {
@@ -96,9 +96,9 @@ func (s *FontRegistry) faceForFont(font Font) *face {
return tf
}
func (t *face) layout(ppem fixed.Int26_6, str string, opts LayoutOptions) *Layout {
func (t *face) layout(ppem fixed.Int26_6, str string, opts LayoutOptions) []Line {
if t == nil {
return fallbackLayout(str)
return nil
}
lk := layoutKey{
ppem: ppem,
@@ -113,18 +113,18 @@ func (t *face) layout(ppem fixed.Int26_6, str string, opts LayoutOptions) *Layou
return l
}
func (t *face) shape(ppem fixed.Int26_6, str String) op.CallOp {
func (t *face) shape(ppem fixed.Int26_6, str string, layout []Glyph) op.CallOp {
if t == nil {
return op.CallOp{}
}
pk := pathKey{
ppem: ppem,
str: str.String,
str: str,
}
if clip, ok := t.pathCache.Get(pk); ok {
return clip
}
clip := t.face.Shape(ppem, str)
clip := t.face.Shape(ppem, layout)
t.pathCache.Put(pk, clip)
return clip
}
@@ -132,16 +132,3 @@ func (t *face) shape(ppem fixed.Int26_6, str String) op.CallOp {
func (t *face) metrics(ppem fixed.Int26_6) font.Metrics {
return t.face.Metrics(ppem)
}
func fallbackLayout(str string) *Layout {
l := &Layout{
Lines: []Line{
{Text: String{
String: str,
}},
},
}
strlen := utf8.RuneCountInString(str)
l.Lines[0].Text.Advances = make([]fixed.Int26_6, strlen)
return l
}
text/text.go
+8 -13
View File
@@ -11,7 +11,9 @@ import (
// A Line contains the measurements of a line of text.
type Line struct {
Text String
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.
@@ -23,16 +25,9 @@ type Line struct {
Bounds fixed.Rectangle26_6
}
type String struct {
String string
// Advances contain the advance of each rune in String.
Advances []fixed.Int26_6
}
// A Layout contains the measurements of a body of text as
// a list of Lines.
type Layout struct {
Lines []Line
type Glyph struct {
Rune rune
Advance fixed.Int26_6
}
// LayoutOptions specify the constraints of a text layout.
@@ -59,8 +54,8 @@ type Font struct {
// Face implements text layout and shaping for a particular font.
type Face interface {
Layout(ppem fixed.Int26_6, str string, opts LayoutOptions) *Layout
Shape(ppem fixed.Int26_6, str String) op.CallOp
Layout(ppem fixed.Int26_6, str string, opts LayoutOptions) []Line
Shape(ppem fixed.Int26_6, str []Glyph) op.CallOp
Metrics(ppem fixed.Int26_6) font.Metrics
}
widget/editor.go
+23 -25
View File
@@ -273,11 +273,13 @@ func (e *Editor) layout(gtx *layout.Context, sh text.Shaper) {
}
e.shapes = e.shapes[:0]
for {
str, off, ok := it.Next()
start, end, layout, off, ok := it.Next()
if !ok {
break
}
path := sh.Shape(gtx, e.font, str)
// TODO: remove
str := e.rr.String()[start:end]
path := sh.Shape(gtx, e.font, str, layout)
e.shapes = append(e.shapes, line{off, path})
}
@@ -433,15 +435,13 @@ func (e *Editor) moveCoord(c unit.Converter, pos image.Point) {
func (e *Editor) layoutText(c unit.Converter, s text.Shaper, font text.Font) ([]text.Line, layout.Dimensions) {
txt := e.rr.String()
opts := text.LayoutOptions{MaxWidth: e.maxWidth}
textLayout := s.Layout(c, font, txt, opts)
lines := textLayout.Lines
lines := s.Layout(c, font, txt, opts)
dims := linesDimens(lines)
for i := 0; i < len(lines)-1; i++ {
s := lines[i].Text.String
// To avoid layout flickering while editing, assume a soft newline takes
// up all available space.
if len(s) > 0 {
r, _ := utf8.DecodeLastRuneInString(s)
if layout := lines[i].Layout; len(layout) > 0 {
r := layout[len(layout)-1].Rune
if r != '\n' {
dims.Size.X = e.maxWidth
break
@@ -459,21 +459,18 @@ loop:
l := e.lines[carLine]
y += (prevDesc + l.Ascent).Ceil()
prevDesc = l.Descent
if carLine == len(e.lines)-1 || idx+len(l.Text.String) > e.rr.caret {
str := l.Text.String
for _, adv := range l.Text.Advances {
if carLine == len(e.lines)-1 || idx+len(l.Layout) > e.rr.caret {
for _, g := range l.Layout {
if idx == e.rr.caret {
break loop
}
x += adv
_, s := utf8.DecodeRuneInString(str)
idx += s
str = str[s:]
x += g.Advance
idx += utf8.RuneLen(g.Rune)
carCol++
}
break
}
idx += len(l.Text.String)
idx += l.Len
}
x += align(e.Alignment, e.lines[carLine].Width, e.viewSize.X)
return
@@ -553,11 +550,11 @@ func (e *Editor) moveToLine(carX fixed.Int26_6, carLine2 int) fixed.Int26_6 {
// Move to start of line2.
if carLine2 > carLine {
for i := carLine; i < carLine2; i++ {
e.rr.caret += len(e.lines[i].Text.String)
e.rr.caret += e.lines[i].Len
}
} else {
for i := carLine - 1; i >= carLine2; i-- {
e.rr.caret -= len(e.lines[i].Text.String)
e.rr.caret -= e.lines[i].Len
}
}
}
@@ -569,15 +566,15 @@ func (e *Editor) moveToLine(carX fixed.Int26_6, carLine2 int) fixed.Int26_6 {
end = 1
}
// Move to rune closest to previous horizontal position.
for i := 0; i < len(l2.Text.Advances)-end; i++ {
adv := l2.Text.Advances[i]
for i := 0; i < len(l2.Layout)-end; i++ {
g := l2.Layout[i]
if carX2 >= carX {
break
}
if carX2+adv-carX >= carX-carX2 {
if carX2+g.Advance-carX >= carX-carX2 {
break
}
carX2 += adv
carX2 += g.Advance
_, s := e.rr.runeAt(e.rr.caret)
e.rr.caret += s
}
@@ -593,11 +590,11 @@ func (e *Editor) Move(distance int) {
func (e *Editor) moveStart() {
carLine, carCol, x, _ := e.layoutCaret()
advances := e.lines[carLine].Text.Advances
layout := e.lines[carLine].Layout
for i := carCol - 1; i >= 0; i-- {
_, s := e.rr.runeBefore(e.rr.caret)
e.rr.caret -= s
x -= advances[i]
x -= layout[i].Advance
}
e.carXOff = -x
}
@@ -610,8 +607,9 @@ func (e *Editor) moveEnd() {
if carLine < len(e.lines)-1 {
end = 1
}
for i := carCol; i < len(l.Text.Advances)-end; i++ {
adv := l.Text.Advances[i]
layout := l.Layout
for i := carCol; i < len(layout)-end; i++ {
adv := layout[i].Advance
_, s := e.rr.runeAt(e.rr.caret)
e.rr.caret += s
x += adv
widget/label.go
+21 -20
View File
@@ -32,11 +32,12 @@ type lineIterator struct {
Offset image.Point
y, prevDesc fixed.Int26_6
txtOff int
}
const inf = 1e6
func (l *lineIterator) Next() (text.String, f32.Point, bool) {
func (l *lineIterator) Next() (int, int, []text.Glyph, f32.Point, bool) {
for len(l.Lines) > 0 {
line := l.Lines[0]
l.Lines = l.Lines[1:]
@@ -50,42 +51,41 @@ func (l *lineIterator) Next() (text.String, f32.Point, bool) {
if (off.Y + line.Bounds.Min.Y).Floor() > l.Clip.Max.Y {
break
}
layout := line.Layout
start := l.txtOff
l.txtOff += line.Len
if (off.Y + line.Bounds.Max.Y).Ceil() < l.Clip.Min.Y {
continue
}
str := line.Text
for len(str.Advances) > 0 {
adv := str.Advances[0]
for len(layout) > 0 {
g := layout[0]
adv := g.Advance
if (off.X + adv + line.Bounds.Max.X - line.Width).Ceil() >= l.Clip.Min.X {
break
}
off.X += adv
_, s := utf8.DecodeRuneInString(str.String)
str.String = str.String[s:]
str.Advances = str.Advances[1:]
layout = layout[1:]
start += utf8.RuneLen(g.Rune)
}
n := 0
end := start
endx := off.X
for i, adv := range str.Advances {
for i, g := range layout {
if (endx + line.Bounds.Min.X).Floor() > l.Clip.Max.X {
str.String = str.String[:n]
str.Advances = str.Advances[:i]
layout = layout[:i]
break
}
_, s := utf8.DecodeRuneInString(str.String[n:])
n += s
endx += adv
end += utf8.RuneLen(g.Rune)
endx += g.Advance
}
offf := f32.Point{X: float32(off.X) / 64, Y: float32(off.Y) / 64}
return str, offf, true
return start, end, layout, offf, true
}
return text.String{}, f32.Point{}, false
return 0, 0, nil, f32.Point{}, false
}
func (l Label) Layout(gtx *layout.Context, s text.Shaper, font text.Font, txt string) {
cs := gtx.Constraints
textLayout := s.Layout(gtx, font, txt, text.LayoutOptions{MaxWidth: cs.Width.Max})
lines := textLayout.Lines
lines := s.Layout(gtx, font, txt, text.LayoutOptions{MaxWidth: cs.Width.Max})
if max := l.MaxLines; max > 0 && len(lines) > max {
lines = lines[:max]
}
@@ -100,7 +100,7 @@ func (l Label) Layout(gtx *layout.Context, s text.Shaper, font text.Font, txt st
Width: dims.Size.X,
}
for {
str, off, ok := it.Next()
start, end, layout, off, ok := it.Next()
if !ok {
break
}
@@ -108,7 +108,8 @@ func (l Label) Layout(gtx *layout.Context, s text.Shaper, font text.Font, txt st
var stack op.StackOp
stack.Push(gtx.Ops)
op.TransformOp{}.Offset(off).Add(gtx.Ops)
s.Shape(gtx, font, str).Add(gtx.Ops)
str := txt[start:end]
s.Shape(gtx, font, str, layout).Add(gtx.Ops)
paint.PaintOp{Rect: lclip}.Add(gtx.Ops)
stack.Pop()
}