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text/v2: add glyphImageCache.atime

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If many runes were added at the same time, GCing the current cache
did nothing and wasted time.
This commit is contained in:
Hajime Hoshi 2024-07-03 18:39:30 +09:00
parent c1315b3238
commit c5974390a8
1 changed files with 20 additions and 14 deletions
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34
text/v2/glyph.go
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@ -44,6 +44,7 @@ type glyphImageCacheEntry struct {
type glyphImageCache[Key comparable] struct {
cache map[Key]*glyphImageCacheEntry
atime int64
m sync.Mutex
}
@ -51,9 +52,11 @@ func (g *glyphImageCache[Key]) getOrCreate(face Face, key Key, create func() *eb
g.m.Lock()
defer g.m.Unlock()
n := now()
e, ok := g.cache[key]
if ok {
e.atime = now()
e.atime = n
return e.image
}
@ -66,7 +69,7 @@ func (g *glyphImageCache[Key]) getOrCreate(face Face, key Key, create func() *eb
image: img,
}
if img != nil {
e.atime = now()
e.atime = n
} else {
// If the glyph image is nil, the entry doesn't have to be removed.
// Keep this until the face is GCed.
@ -75,21 +78,24 @@ func (g *glyphImageCache[Key]) getOrCreate(face Face, key Key, create func() *eb
g.cache[key] = e
// Clean up old entries.
// cacheSoftLimit indicates the soft limit of the number of glyphs in the cache.
// If the number of glyphs exceeds this soft limits, old glyphs are removed.
// Even after cleaning up the cache, the number of glyphs might still exceed the soft limit, but
// this is fine.
cacheSoftLimit := 128 * glyphVariationCount(face)
if len(g.cache) > cacheSoftLimit {
for key, e := range g.cache {
// 60 is an arbitrary number.
if e.atime >= now()-60 {
continue
if g.atime < n {
// cacheSoftLimit indicates the soft limit of the number of glyphs in the cache.
// If the number of glyphs exceeds this soft limits, old glyphs are removed.
// Even after cleaning up the cache, the number of glyphs might still exceed the soft limit, but
// this is fine.
cacheSoftLimit := 128 * glyphVariationCount(face)
if len(g.cache) > cacheSoftLimit {
for key, e := range g.cache {
// 60 is an arbitrary number.
if e.atime >= now()-60 {
continue
}
delete(g.cache, key)
}
delete(g.cache, key)
}
}
g.atime = n
return img
}