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faster text rendering

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This commit is contained in:
Thomas Friedel 2020-03-16 18:29:05 +01:00
parent 84d2b4f3cb
commit 421d388f91
1 changed files with 8 additions and 7 deletions
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15
text.go
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@ -234,6 +234,9 @@ func (cv *Canvas) StrokeText(str string, x, y float64) {
frc.setFontSize(float64(cv.state.fontSize)) frc.setFontSize(float64(cv.state.fontSize))
fnt := cv.state.font.font fnt := cv.state.font.font
prevPath := cv.path
cv.BeginPath()
for _, rn := range str { for _, rn := range str {
idx := fnt.Index(rn) idx := fnt.Index(rn)
if idx == 0 { if idx == 0 {
@ -244,21 +247,19 @@ func (cv *Canvas) StrokeText(str string, x, y float64) {
continue continue
} }
cv.strokeRune(rn, vec{x, y}) cv.runePath(rn, vec{x, y})
x += float64(advance) / 64 x += float64(advance) / 64
} }
cv.Stroke()
cv.path = prevPath
} }
func (cv *Canvas) strokeRune(rn rune, pos vec) { func (cv *Canvas) runePath(rn rune, pos vec) {
gb := &truetype.GlyphBuf{} gb := &truetype.GlyphBuf{}
gb.Load(cv.state.font.font, fixed.Int26_6(cv.state.fontSize*64), cv.state.font.font.Index(rn), font.HintingNone) gb.Load(cv.state.font.font, fixed.Int26_6(cv.state.fontSize*64), cv.state.font.font.Index(rn), font.HintingNone)
prevPath := cv.path
defer func() {
cv.path = prevPath
}()
from := 0 from := 0
for _, to := range gb.Ends { for _, to := range gb.Ends {
ps := gb.Points[from:to] ps := gb.Points[from:to]