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text: Add explanation about cache limit

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Hajime Hoshi 2021-04-27 02:36:33 +09:00
parent 3f97386d8e
commit a716edc713
1 changed files with 2 additions and 2 deletions
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4
text/text.go
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@ -157,7 +157,7 @@ var textM sync.Mutex
//
// Glyphs used for rendering are cached in least-recently-used way.
// Then old glyphs might be evicted from the cache.
// It is not guaranteed that all the glyphs given at Draw are cached.
// As the cache capacity has limit, it is not guaranteed that all the glyphs for runes given at Draw are cached.
// The cache is shared with CacheGlyphs.
//
// It is OK to call Draw with a same text and a same face at every frame in terms of performance.
@ -284,7 +284,7 @@ func BoundString(face font.Face, text string) image.Rectangle {
//
// Glyphs used for rendering are cached in least-recently-used way.
// Then old glyphs might be evicted from the cache.
// It is not guaranteed that all the glyphs given at CacheGlyphs are cached.
// As the cache capacity has limit, it is not guaranteed that all the glyphs for runes given at CacheGlyphs are cached.
// The cache is shared with Draw.
//
// Draw and CacheGlyphs are implemented like this: