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text: Improve the comments

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Hajime Hoshi 2021-04-27 02:20:10 +09:00
parent ec3e10e3f7
commit df4c8532df
1 changed files with 9 additions and 9 deletions
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18
text/text.go
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@ -161,9 +161,9 @@ var textM sync.Mutex
//
// The two functions are implemented like this:
//
// Draw = Create glyphs by `ReplacePixels` and put them into the cache if necessary
// + Draw them onto the destination by `DrawImage`
// CacheGlyphs = Create glyphs by `ReplacePixels` and put them into the cache if necessary
// Draw = Create glyphs by `(*ebiten.Image).ReplacePixels` and put them into the cache if necessary
// + Draw them onto the destination by `(*ebiten.Image).DrawImage`
// CacheGlyphs = Create glyphs by `(*ebiten.Image).ReplacePixels` and put them into the cache if necessary
//
// Be careful that the passed font face is held by this package and is never released.
// This is a known issue (#498).
@ -283,15 +283,15 @@ func BoundString(face font.Face, text string) image.Rectangle {
// Draw automatically creates and caches necessary glyphs, so usually you don't have to call CacheGlyphs
// explicitly. However, for example, when you call Draw for each rune of one big text, Draw tries to create the glyph
// cache and render it for each rune. This is very inefficient because creating a glyph image and rendering it are
// different operations (ReplacePixels and DrawImage) and can never be merged as one draw call.
// CacheGlyphs creates necessary glyphs without rendering them so that these operations are likely merged into one
// draw call regardless of the size of the text.
// different operations (`(*ebiten.Image).ReplacePixels` and `(*ebiten.Image).DrawImage`) and can never be merged as
// one draw call. CacheGlyphs creates necessary glyphs without rendering them so that these operations are likely
// merged into one draw call regardless of the size of the text.
//
// The two functions are implemented like this:
//
// Draw = Create glyphs by `ReplacePixels` and put them into the cache if necessary
// + Draw them onto the destination by `DrawImage`
// CacheGlyphs = Create glyphs by `ReplacePixels` and put them into the cache if necessary
// Draw = Create glyphs by `(*ebiten.Image).ReplacePixels` and put them into the cache if necessary
// + Draw them onto the destination by `(*ebiten.Image).DrawImage`
// CacheGlyphs = Create glyphs by `(*ebiten.Image).ReplacePixels` and put them into the cache if necessary
//
// If a rune's glyph is already cached, CacheGlyphs does nothing for the rune.
func CacheGlyphs(face font.Face, text string) {