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text: Optimization: reduce ColorM calc

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This commit is contained in:
Hajime Hoshi 2018-04-23 22:42:38 +09:00
parent 5257e6f9a7
commit 059bab0b13
1 changed files with 58 additions and 46 deletions
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104
text/text.go
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@ -53,59 +53,16 @@ type colorMCacheEntry struct {
atime int64
}
var (
colorMCache = map[colorMCacheKey]*colorMCacheEntry{}
)
func drawGlyph(dst *ebiten.Image, face font.Face, r rune, img *glyphImage, x, y fixed.Int26_6, clr color.Color) {
func drawGlyph(dst *ebiten.Image, face font.Face, r rune, img *glyphImage, x, y fixed.Int26_6, clr ebiten.ColorM) {
if img == nil {
return
}
// 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
}
b := getGlyphBounds(face, r)
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(fixed26_6ToFloat64(x+b.Min.X), fixed26_6ToFloat64(y+b.Min.Y))
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) > cacheLimit {
oldest := int64(math.MaxInt64)
oldestKey := colorMCacheKey(0)
for key, c := range colorMCache {
if c.atime < oldest {
oldestKey = key
oldest = c.atime
}
}
delete(colorMCache, oldestKey)
}
cm := ebiten.ColorM{}
rf := float64(cr) / float64(ca)
gf := float64(cg) / float64(ca)
bf := float64(cb) / float64(ca)
af := float64(ca) / 0xff
cm.Scale(rf, gf, bf, af)
e = &colorMCacheEntry{
m: cm,
atime: now(),
}
colorMCache[key] = e
}
op.ColorM = e.m
op.ColorM = clr
re := image.Rect(img.x, img.y, img.x+img.width, img.y+img.height)
op.SourceRect = &re
@ -191,6 +148,7 @@ func getGlyphImages(face font.Face, runes []rune) []*glyphImage {
neededGlyphs[i] = b
}
// TODO: What if w2 is too big (e.g. > 4096)?
w2 := 0
h2 := 0
for _, b := range neededGlyphs {
@ -236,6 +194,58 @@ func getGlyphImages(face font.Face, runes []rune) []*glyphImage {
var textM sync.Mutex
var (
colorMCache = map[colorMCacheKey]*colorMCacheEntry{}
emptyColorM ebiten.ColorM
)
func init() {
emptyColorM.Scale(0, 0, 0, 0)
}
func colorToColorM(clr color.Color) ebiten.ColorM {
// 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 emptyColorM
}
key := colorMCacheKey(uint32(cr) | (uint32(cg) << 8) | (uint32(cb) << 16) | (uint32(ca) << 24))
e, ok := colorMCache[key]
if ok {
e.atime = now()
return e.m
}
if len(colorMCache) > cacheLimit {
oldest := int64(math.MaxInt64)
oldestKey := colorMCacheKey(0)
for key, c := range colorMCache {
if c.atime < oldest {
oldestKey = key
oldest = c.atime
}
}
delete(colorMCache, oldestKey)
}
cm := ebiten.ColorM{}
rf := float64(cr) / float64(ca)
gf := float64(cg) / float64(ca)
bf := float64(cb) / float64(ca)
af := float64(ca) / 0xff
cm.Scale(rf, gf, bf, af)
e = &colorMCacheEntry{
m: cm,
atime: now(),
}
colorMCache[key] = e
return e.m
}
// Draw draws a given text on a given destination image dst.
//
// face is the font for text rendering.
@ -258,11 +268,13 @@ func Draw(dst *ebiten.Image, text string, face font.Face, x, y int, clr color.Co
runes := []rune(text)
glyphImgs := getGlyphImages(face, runes)
colorm := colorToColorM(clr)
for i, r := range runes {
if prevR >= 0 {
fx += face.Kern(prevR, r)
}
drawGlyph(dst, face, r, glyphImgs[i], fx, fixed.I(y), clr)
drawGlyph(dst, face, r, glyphImgs[i], fx, fixed.I(y), colorm)
fx += glyphAdvance(face, r)
prevR = r