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text: Reuse font.Face instances if they are DeepEqual-ly same (#498)

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This commit is contained in:
Hajime Hoshi 2018-02-11 16:05:27 +09:00
parent fb7dc53031
commit 05671e784b
1 changed files with 30 additions and 5 deletions
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35
text/text.go
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@ -21,6 +21,7 @@ import (
"image"
"image/color"
"math"
"reflect"
"golang.org/x/image/font"
"golang.org/x/image/math/fixed"
@ -39,12 +40,36 @@ func now() int64 {
return monotonicClock
}
type face struct {
f font.Face
}
var (
faces = map[font.Face]face{}
)
func fontFaceToFace(f font.Face) face {
if fa, ok := faces[f]; ok {
return fa
}
// If the (DeepEqual-ly) same font exists,
// reuse this to avoid to consume a lot of cache (#498).
for key, value := range faces {
if reflect.DeepEqual(key, f) {
return value
}
}
fe := face{f}
faces[f] = fe
return fe
}
var (
charBounds = map[char]fixed.Rectangle26_6{}
)
type char struct {
face font.Face
face face
rune rune
}
@ -52,7 +77,7 @@ func (c *char) bounds() fixed.Rectangle26_6 {
if b, ok := charBounds[*c]; ok {
return b
}
b, _, _ := c.face.GlyphBounds(c.rune)
b, _, _ := c.face.f.GlyphBounds(c.rune)
charBounds[*c] = b
return b
}
@ -153,7 +178,7 @@ func (a *atlas) maxGlyphNum() int {
return xnum * ynum
}
func (a *atlas) appendGlyph(face font.Face, rune rune, now int64) *glyph {
func (a *atlas) appendGlyph(face face, rune rune, now int64) *glyph {
g := &glyph{
char: char{face, rune},
atime: now,
@ -191,7 +216,7 @@ func (a *atlas) draw(glyph *glyph) {
d := font.Drawer{
Dst: dst,
Src: image.White,
Face: glyph.char.face,
Face: glyph.char.face.f,
}
b := glyph.char.bounds()
d.Dot = fixed.Point26_6{-b.Min.X, -b.Min.Y}
@ -208,7 +233,7 @@ func (a *atlas) draw(glyph *glyph) {
}
func getGlyphFromCache(face font.Face, r rune, now int64) *glyph {
ch := char{face, r}
ch := char{fontFaceToFace(face), r}
a, ok := atlases[ch.atlasGroup()]
if ok {
g, ok := a.charToGlyph[ch]