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text: Refactoring

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This commit is contained in:
Hajime Hoshi 2017-07-17 01:54:10 +09:00
parent 4b4292a856
commit 9908fe0d31
1 changed files with 30 additions and 17 deletions
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47
text/text.go
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@ -50,9 +50,6 @@ type glyph struct {
}
func (g *glyph) size() (int, int) {
if g.bounds.Empty() {
g.bounds, _ = font.BoundString(g.char.face, string(g.char.rune))
}
p := g.bounds.Max.Sub(g.bounds.Min)
return p.X.Ceil(), p.Y.Ceil()
}
@ -110,11 +107,21 @@ var (
)
type atlas struct {
image *ebiten.Image
// image is the back-end image to hold glyph cache.
image *ebiten.Image
// tmpImage is the temporary image as a renderer source for glyph.
tmpImage *ebiten.Image
size int
glyphs []*glyph
count int
// size is the size of one glyph in the cache.
// This value is always power of 2.
size int
// glyphs is the set of glyph information.
glyphs []*glyph
// num is the number of glyphs the atlas holds.
num int
}
func (a *atlas) at(glyph *glyph) (int, int) {
@ -128,7 +135,7 @@ func (a *atlas) at(glyph *glyph) (int, int) {
}
func (a *atlas) append(glyph *glyph) {
if a.count == len(a.glyphs) {
if a.num == len(a.glyphs) {
idx := -1
t := int64(math.MaxInt64)
for i, g := range a.glyphs {
@ -158,7 +165,7 @@ func (a *atlas) append(glyph *glyph) {
if idx < 0 {
panic("not reached")
}
a.count++
a.num++
glyph.index = idx
a.glyphs[idx] = glyph
a.draw(glyph)
@ -198,9 +205,14 @@ 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,
atime: now,
char: ch,
bounds: b,
atime: now,
}
if g.empty() {
return g
@ -259,6 +271,7 @@ func Draw(dst *ebiten.Image, face font.Face, text string, x, y int, lineHeight i
runes := []rune(text)
for _, c := range runes {
// TODO: What if c is '\r'?
if c == '\n' {
fx = ofx
y += lineHeight
@ -270,13 +283,13 @@ func Draw(dst *ebiten.Image, face font.Face, text string, x, y int, lineHeight i
fx += face.Kern(prevC, c)
}
g := getGlyphFromCache(face, c, n)
if !g.empty() {
g.draw(dst, fx.Ceil(), y, clr)
if g := getGlyphFromCache(face, c, n); g != nil {
if !g.empty() {
g.draw(dst, fx.Ceil(), y, clr)
}
a, _ := face.GlyphAdvance(c)
fx += a
}
a, _ := face.GlyphAdvance(c)
fx += a
prevC = c
}