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ui/measure: document and export Face

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Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2019-08-11 19:14:53 +02:00
parent 5c3dcc6f9a
commit 628a97cd71
1 changed files with 16 additions and 8 deletions
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ui/measure/measure.go
+16 -8
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@@ -1,5 +1,8 @@
// SPDX-License-Identifier: Unlicense OR MIT
/*
Package measure implements text layout and shaping.
*/
package measure
import (
@@ -9,16 +12,17 @@ import (
"gioui.org/ui"
"gioui.org/ui/f32"
"gioui.org/ui/text"
"gioui.org/ui/paint"
"gioui.org/ui/text"
"golang.org/x/image/font"
"golang.org/x/image/font/sfnt"
"golang.org/x/image/math/fixed"
)
// Faces is a cache of text layouts and paths.
type Faces struct {
config ui.Config
faceCache map[faceKey]*textFace
faceCache map[faceKey]*Face
layoutCache map[layoutKey]cachedLayout
pathCache map[pathKey]cachedPath
}
@@ -51,12 +55,15 @@ type faceKey struct {
size ui.Value
}
type textFace struct {
// Face is a cached implementation of text.Face.
type Face struct {
faces *Faces
size ui.Value
font *opentype
}
// Reset the cache, discarding any measures or paths that
// haven't been used since the last call to Reset.
func (f *Faces) Reset(c ui.Config) {
f.config = c
f.init()
@@ -78,13 +85,14 @@ func (f *Faces) Reset(c ui.Config) {
}
}
func (f *Faces) For(fnt *sfnt.Font, size ui.Value) text.Face {
// For returns a Face for the given font and size.
func (f *Faces) For(fnt *sfnt.Font, size ui.Value) *Face {
f.init()
fk := faceKey{fnt, size}
if f, exist := f.faceCache[fk]; exist {
return f
}
face := &textFace{
face := &Face{
faces: f,
size: size,
font: &opentype{Font: fnt, Hinting: font.HintingFull},
@@ -97,12 +105,12 @@ func (f *Faces) init() {
if f.faceCache != nil {
return
}
f.faceCache = make(map[faceKey]*textFace)
f.faceCache = make(map[faceKey]*Face)
f.pathCache = make(map[pathKey]cachedPath)
f.layoutCache = make(map[layoutKey]cachedLayout)
}
func (f *textFace) Layout(str string, opts text.LayoutOptions) *text.Layout {
func (f *Face) Layout(str string, opts text.LayoutOptions) *text.Layout {
ppem := fixed.Int26_6(f.faces.config.Px(f.size) * 64)
lk := layoutKey{
f: f.font.Font,
@@ -120,7 +128,7 @@ func (f *textFace) Layout(str string, opts text.LayoutOptions) *text.Layout {
return l
}
func (f *textFace) Path(str text.String) ui.MacroOp {
func (f *Face) Path(str text.String) ui.MacroOp {
ppem := fixed.Int26_6(f.faces.config.Px(f.size) * 64)
pk := pathKey{
f: f.font.Font,