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text: Cache color matrices for performance

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Hajime Hoshi 2018-02-12 03:33:11 +09:00
parent 9118772fd1
commit 12cef4d27e
1 changed files with 15 additions and 5 deletions
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20
text/text.go
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@ -124,6 +124,10 @@ func fixed26_6ToFloat64(x fixed.Int26_6) float64 {
return float64(x) / (1 << 6)
}
var (
colorMCache = map[color.Color]ebiten.ColorM{}
)
func (g *glyph) draw(dst *ebiten.Image, x, y fixed.Int26_6, clr color.Color) {
cr, cg, cb, ca := clr.RGBA()
if ca == 0 {
@ -134,11 +138,17 @@ 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))
rf := float64(cr) / float64(ca)
gf := float64(cg) / float64(ca)
bf := float64(cb) / float64(ca)
af := float64(ca) / 0xffff
op.ColorM.Scale(rf, gf, bf, af)
cm, ok := colorMCache[clr]
if !ok {
rf := float64(cr) / float64(ca)
gf := float64(cg) / float64(ca)
bf := float64(cb) / float64(ca)
af := float64(ca) / 0xffff
cm.Reset()
cm.Scale(rf, gf, bf, af)
colorMCache[clr] = cm
}
op.ColorM = cm
a := atlases[g.char.face][g.char.atlasGroup()]
sx, sy := a.at(g)