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text: cache Kern values

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Closes #2673
This commit is contained in:
Hajime Hoshi 2023-05-28 23:23:35 +09:00
parent e374ca0ac3
commit baea6d47ee
1 changed files with 18 additions and 2 deletions
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20
text/cache.go
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@ -32,11 +32,17 @@ type glyphAdvanceCacheValue struct {
ok bool
}
type kernCacheKey struct {
r0 rune
r1 rune
}
type faceWithCache struct {
f font.Face
glyphBoundsCache map[rune]glyphBoundsCacheValue
glyphAdvanceCache map[rune]glyphAdvanceCacheValue
kernCache map[kernCacheKey]fixed.Int26_6
}
func (f *faceWithCache) Close() error {
@ -46,6 +52,7 @@ func (f *faceWithCache) Close() error {
f.glyphBoundsCache = nil
f.glyphAdvanceCache = nil
f.kernCache = nil
return nil
}
@ -105,8 +112,17 @@ func (f *faceWithCache) GlyphAdvance(r rune) (advance fixed.Int26_6, ok bool) {
}
func (f *faceWithCache) Kern(r0, r1 rune) fixed.Int26_6 {
// TODO: Cache the values (#2673).
return f.f.Kern(r0, r1)
key := kernCacheKey{r0: r0, r1: r1}
if v, ok := f.kernCache[key]; ok {
return v
}
v := f.f.Kern(r0, r1)
if f.kernCache == nil {
f.kernCache = map[kernCacheKey]fixed.Int26_6{}
}
f.kernCache[key] = v
return v
}
func (f *faceWithCache) Metrics() font.Metrics {