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text: Use uint32 for map keys instead of color.Color interface

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This commit is contained in:
Hajime Hoshi 2018-02-12 19:32:21 +09:00
parent 95480d0644
commit 57dd7db893
1 changed files with 13 additions and 5 deletions
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18
text/text.go
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@ -124,17 +124,24 @@ func fixed26_6ToFloat64(x fixed.Int26_6) float64 {
return float64(x) / (1 << 6)
}
type colorMCacheKey uint32
type colorMCacheEntry struct {
m ebiten.ColorM
atime int64
}
var (
colorMCache = map[color.Color]*colorMCacheEntry{}
colorMCache = map[colorMCacheKey]*colorMCacheEntry{}
)
func (g *glyph) draw(dst *ebiten.Image, x, y fixed.Int26_6, clr color.Color) {
// RGBA() is in [0 - 0xffff]. Adjust them in [0 - 0xff].
cr, cg, cb, ca := clr.RGBA()
cr >>= 8
cg >>= 8
cb >>= 8
ca >>= 8
if ca == 0 {
return
}
@ -143,12 +150,13 @@ func (g *glyph) draw(dst *ebiten.Image, x, y fixed.Int26_6, clr color.Color) {
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(fixed26_6ToFloat64(x+b.Min.X), fixed26_6ToFloat64(y+b.Min.Y))
e, ok := colorMCache[clr]
key := colorMCacheKey(uint32(cr) | (uint32(cg) << 8) | (uint32(cb) << 16) | (uint32(ca) << 24))
e, ok := colorMCache[key]
if ok {
e.atime = now()
} else {
if len(colorMCache) >= 256 {
var oldest color.Color
var oldest colorMCacheKey
t := int64(math.MaxInt64)
for key, e := range colorMCache {
if e.atime < t {
@ -162,13 +170,13 @@ func (g *glyph) draw(dst *ebiten.Image, x, y fixed.Int26_6, clr color.Color) {
rf := float64(cr) / float64(ca)
gf := float64(cg) / float64(ca)
bf := float64(cb) / float64(ca)
af := float64(ca) / 0xffff
af := float64(ca) / 0xff
cm.Scale(rf, gf, bf, af)
e = &colorMCacheEntry{
m: cm,
atime: now(),
}
colorMCache[clr] = e
colorMCache[key] = e
}
op.ColorM = e.m