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text: Refactoring

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This commit is contained in:
Hajime Hoshi 2020-11-03 16:36:10 +09:00
parent 5ec05ed79d
commit ec6821b1e1
1 changed files with 5 additions and 3 deletions
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8
text/text.go
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@ -81,7 +81,7 @@ var (
emptyGlyphs = map[font.Face]map[rune]struct{}{} emptyGlyphs = map[font.Face]map[rune]struct{}{}
) )
func getGlyphImages(face font.Face, runes []rune, cacheLimit int) []*ebiten.Image { func getGlyphImages(face font.Face, runes []rune) []*ebiten.Image {
if _, ok := emptyGlyphs[face]; !ok { if _, ok := emptyGlyphs[face]; !ok {
emptyGlyphs[face] = map[rune]struct{}{} emptyGlyphs[face] = map[rune]struct{}{}
} }
@ -183,9 +183,8 @@ func Draw(dst *ebiten.Image, text string, face font.Face, x, y int, clr color.Co
faceHeight := face.Metrics().Height faceHeight := face.Metrics().Height
const cacheLimit = 512 // This is an arbitrary number.
runes := []rune(text) runes := []rune(text)
glyphImgs := getGlyphImages(face, runes, cacheLimit) glyphImgs := getGlyphImages(face, runes)
colorm := colormcache.ColorToColorM(clr) colorm := colormcache.ColorToColorM(clr)
for i, r := range runes { for i, r := range runes {
@ -205,6 +204,9 @@ func Draw(dst *ebiten.Image, text string, face font.Face, x, y int, clr color.Co
prevR = r prevR = r
} }
const cacheLimit = 512
// Clean up the cache.
for len(glyphImageCache[face]) > cacheLimit { for len(glyphImageCache[face]) > cacheLimit {
oldest := int64(math.MaxInt64) oldest := int64(math.MaxInt64)
oldestKey := rune(-1) oldestKey := rune(-1)