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text: cache metrics

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This commit is contained in:
Hajime Hoshi 2023-12-11 17:39:27 +09:00
parent 5a8cfb2561
commit 159c19a671
1 changed files with 7 additions and 2 deletions
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9
text/cache.go
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@ -38,7 +38,8 @@ type kernCacheKey struct {
}
type faceWithCache struct {
f font.Face
f font.Face
metrics font.Metrics
glyphBoundsCache map[rune]glyphBoundsCacheValue
glyphAdvanceCache map[rune]glyphAdvanceCacheValue
@ -126,5 +127,9 @@ func (f *faceWithCache) Kern(r0, r1 rune) fixed.Int26_6 {
}
func (f *faceWithCache) Metrics() font.Metrics {
return f.f.Metrics()
if f.metrics != (font.Metrics{}) {
return f.metrics
}
f.metrics = f.f.Metrics()
return f.metrics
}