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text: Change getGlyphImages to getGlyphImage to avoid allocating slices

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This commit is contained in:
Hajime Hoshi 2021-01-05 12:21:41 +09:00
parent f77c514598
commit 927c477d2b
1 changed files with 48 additions and 60 deletions
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38
text/text.go
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@ -88,7 +88,7 @@ var (
emptyGlyphs = map[font.Face]map[rune]struct{}{}
)
func getGlyphImages(face font.Face, runes []rune) []*ebiten.Image {
func getGlyphImage(face font.Face, r rune) *ebiten.Image {
if _, ok := emptyGlyphs[face]; !ok {
emptyGlyphs[face] = map[rune]struct{}{}
}
@ -96,34 +96,22 @@ func getGlyphImages(face font.Face, runes []rune) []*ebiten.Image {
glyphImageCache[face] = map[rune]*glyphImageCacheEntry{}
}
imgs := make([]*ebiten.Image, len(runes))
glyphBounds := map[rune]fixed.Rectangle26_6{}
neededGlyphIndices := map[int]rune{}
for i, r := range runes {
if _, ok := emptyGlyphs[face][r]; ok {
continue
return nil
}
if e, ok := glyphImageCache[face][r]; ok {
e.atime = now()
imgs[i] = e.image
continue
return e.image
}
b := getGlyphBounds(face, r)
w, h := (b.Max.X - b.Min.X).Ceil(), (b.Max.Y - b.Min.Y).Ceil()
if w == 0 || h == 0 {
emptyGlyphs[face][r] = struct{}{}
continue
return nil
}
glyphBounds[r] = b
neededGlyphIndices[i] = r
}
for i, r := range neededGlyphIndices {
b := glyphBounds[r]
w, h := (b.Max.X - b.Min.X).Ceil(), (b.Max.Y - b.Min.Y).Ceil()
if b.Min.X&((1<<6)-1) != 0 {
w++
}
@ -149,9 +137,8 @@ func getGlyphImages(face font.Face, runes []rune) []*ebiten.Image {
atime: now(),
}
}
imgs[i] = img
}
return imgs
return img
}
var textM sync.Mutex
@ -190,11 +177,9 @@ func Draw(dst *ebiten.Image, text string, face font.Face, x, y int, clr color.Co
faceHeight := face.Metrics().Height
runes := []rune(text)
glyphImgs := getGlyphImages(face, runes)
colorm := colormcache.ColorToColorM(clr)
for i, r := range runes {
for _, r := range text {
if prevR >= 0 {
fx += face.Kern(prevR, r)
}
@ -205,7 +190,8 @@ func Draw(dst *ebiten.Image, text string, face font.Face, x, y int, clr color.Co
continue
}
drawGlyph(dst, face, r, glyphImgs[i], fx, fy, colorm)
img := getGlyphImage(face, r)
drawGlyph(dst, face, r, img, fx, fy, colorm)
fx += glyphAdvance(face, r)
prevR = r
@ -254,7 +240,7 @@ func BoundString(face font.Face, text string) image.Rectangle {
prevR := rune(-1)
var bounds fixed.Rectangle26_6
for _, r := range []rune(text) {
for _, r := range text {
if prevR >= 0 {
fx += face.Kern(prevR, r)
}
@ -297,5 +283,7 @@ func CacheGlyphs(face font.Face, text string) {
textM.Lock()
defer textM.Unlock()
getGlyphImages(face, []rune(text))
for _, r := range text {
getGlyphImage(face, r)
}
}