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fixed overlapping alpha

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This commit is contained in:
Thomas Friedel 2019-04-18 10:55:03 +02:00
parent 9edbb8da85
commit a0a1adef12
2 changed files with 13 additions and 4 deletions
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13
backend/software/fill.go
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@ -20,11 +20,20 @@ func (b *SoftwareBackend) Clear(pts [4][2]float64) {
}
func (b *SoftwareBackend) Fill(style *backendbase.FillStyle, pts [][2]float64) {
p2 := b.mask.Pix
for i := range p2 {
p2[i] = 0
}
iterateTriangles(pts[:], func(tri [][2]float64) {
b.fillTriangle(tri, func(x, y int) {
if b.clip.AlphaAt(x, y).A == 0 {
return
}
if b.mask.AlphaAt(x, y).A > 0 {
return
}
b.mask.SetAlpha(x, y, color.Alpha{A: 255})
b.Image.SetRGBA(x, y, mix(style.Color, b.Image.RGBAAt(x, y)))
})
})
@ -90,14 +99,14 @@ func (b *SoftwareBackend) ClearClip() {
}
func (b *SoftwareBackend) Clip(pts [][2]float64) {
p2 := b.clip2.Pix
p2 := b.mask.Pix
for i := range p2 {
p2[i] = 0
}
iterateTriangles(pts[:], func(tri [][2]float64) {
b.fillTriangle(tri, func(x, y int) {
b.clip2.SetAlpha(x, y, color.Alpha{A: 255})
b.mask.SetAlpha(x, y, color.Alpha{A: 255})
})
})

4
backend/software/software.go
View file

@ -10,7 +10,7 @@ import (
type SoftwareBackend struct {
Image *image.RGBA
clip *image.Alpha
clip2 *image.Alpha
mask *image.Alpha
w, h int
}
@ -24,7 +24,7 @@ func (b *SoftwareBackend) SetSize(w, h int) {
b.w, b.h = w, h
b.Image = image.NewRGBA(image.Rect(0, 0, w, h))
b.clip = image.NewAlpha(image.Rect(0, 0, w, h))
b.clip2 = image.NewAlpha(image.Rect(0, 0, w, h))
b.mask = image.NewAlpha(image.Rect(0, 0, w, h))
b.ClearClip()
}