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text: Refactoring

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This commit is contained in:
Hajime Hoshi 2017-07-18 02:16:39 +09:00
parent 9efc794547
commit 86296ea89b
1 changed files with 37 additions and 27 deletions
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60
text/text.go
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@ -39,29 +39,36 @@ func now() int64 {
return monotonicClock
}
var (
charBounds = map[char]fixed.Rectangle26_6{}
)
type char struct {
face font.Face
rune rune
}
type glyph struct {
char char
index int
bounds fixed.Rectangle26_6
atime int64
func (c *char) bounds() fixed.Rectangle26_6 {
if b, ok := charBounds[*c]; ok {
return b
}
b, _, _ := c.face.GlyphBounds(c.rune)
charBounds[*c] = b
return b
}
func (g *glyph) size() fixed.Point26_6 {
return g.bounds.Max.Sub(g.bounds.Min)
func (c *char) size() fixed.Point26_6 {
b := c.bounds()
return b.Max.Sub(b.Min)
}
func (g *glyph) empty() bool {
s := g.size()
func (c *char) empty() bool {
s := c.size()
return s.X == 0 || s.Y == 0
}
func (g *glyph) atlasGroup() int {
s := g.size()
func (c *char) atlasGroup() int {
s := c.size()
w, h := s.X.Ceil(), s.Y.Ceil()
t := w
if t < h {
@ -76,6 +83,12 @@ func (g *glyph) atlasGroup() int {
return graphics.NextPowerOf2Int(t)
}
type glyph struct {
char char
index int
atime int64
}
func fixed26_6ToFloat64(x fixed.Int26_6) float64 {
return float64(x) / (1 << 6)
}
@ -86,9 +99,10 @@ func (g *glyph) draw(dst *ebiten.Image, x, y fixed.Int26_6, clr color.Color) {
return
}
b := g.char.bounds()
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(fixed26_6ToFloat64(x), fixed26_6ToFloat64(y))
op.GeoM.Translate(fixed26_6ToFloat64(g.bounds.Min.X), fixed26_6ToFloat64(g.bounds.Min.Y))
op.GeoM.Translate(fixed26_6ToFloat64(b.Min.X), fixed26_6ToFloat64(b.Min.Y))
rf := float64(cr) / float64(ca)
gf := float64(cg) / float64(ca)
@ -96,7 +110,7 @@ func (g *glyph) draw(dst *ebiten.Image, x, y fixed.Int26_6, clr color.Color) {
af := float64(ca) / 0xffff
op.ColorM.Scale(rf, gf, bf, af)
a := atlases[g.atlasGroup()]
a := atlases[g.char.atlasGroup()]
sx, sy := a.at(g)
r := image.Rect(sx, sy, sx+a.size, sy+a.size)
op.SourceRect = &r
@ -128,7 +142,7 @@ type atlas struct {
}
func (a *atlas) at(glyph *glyph) (int, int) {
if a.size != glyph.atlasGroup() {
if a.size != glyph.char.atlasGroup() {
panic("not reached")
}
w, _ := a.image.Size()
@ -185,7 +199,8 @@ func (a *atlas) draw(glyph *glyph) {
Src: image.White,
Face: glyph.char.face,
}
d.Dot = fixed.Point26_6{-glyph.bounds.Min.X, -glyph.bounds.Min.Y}
b := glyph.char.bounds()
d.Dot = fixed.Point26_6{-b.Min.X, -b.Min.Y}
d.DrawString(string(glyph.char.rune))
a.tmpImage.ReplacePixels(dst.Pix)
@ -206,20 +221,15 @@ func getGlyphFromCache(face font.Face, r rune, now int64) *glyph {
return g
}
b, _, ok := face.GlyphBounds(r)
if !ok {
return nil
}
g = &glyph{
char: ch,
bounds: b,
atime: now,
}
if g.empty() {
if ch.empty() {
return g
}
a, ok := atlases[g.atlasGroup()]
a, ok := atlases[g.char.atlasGroup()]
if !ok {
// Don't use ebiten.MaxImageSize here.
// It's because the back-end image pixels will be restored from GPU
@ -235,13 +245,13 @@ func getGlyphFromCache(face font.Face, r rune, now int64) *glyph {
i, _ := ebiten.NewImage(size, size, ebiten.FilterNearest)
a = &atlas{
image: i,
size: g.atlasGroup(),
size: g.char.atlasGroup(),
}
w, h := a.image.Size()
xnum := w / a.size
ynum := h / a.size
a.glyphs = make([]*glyph, xnum*ynum)
atlases[g.atlasGroup()] = a
atlases[g.char.atlasGroup()] = a
}
a.append(g)
@ -274,7 +284,7 @@ func Draw(dst *ebiten.Image, face font.Face, text string, x, y int, clr color.Co
fx += face.Kern(prevC, c)
}
if g := getGlyphFromCache(face, c, n); g != nil {
if !g.empty() {
if !g.char.empty() {
g.draw(dst, fx, fixed.I(y), clr)
}
a, _ := face.GlyphAdvance(c)