aw/go-resize
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jst 2013-04-09 21:59:02 +02:00
parent 62777ac833
commit c37f8f8470
1 changed files with 7 additions and 7 deletions
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14
filters.go
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@ -170,17 +170,17 @@ func Bilinear(img image.Image, factor [2]float32) Filter {
} }
func splineKernel(B, C float32) func(float32) float32 { func splineKernel(B, C float32) func(float32) float32 {
factorA := 2.0-1.5*B-C factorA := 2.0 - 1.5*B - C
factorB := -3.0+2.0*B+C factorB := -3.0 + 2.0*B + C
factorC := 1.0-1.0/3.0*B factorC := 1.0 - 1.0/3.0*B
factorD := -B/6.0-C factorD := -B/6.0 - C
factorE := B+5.0*C factorE := B + 5.0*C
factorF := -2.0*B-8.0*C factorF := -2.0*B - 8.0*C
factorG := 4.0/3.0*B + 4.0*C factorG := 4.0/3.0*B + 4.0*C
return func(x float32) (y float32) { return func(x float32) (y float32) {
absX := float32(math.Abs(float64(x))) absX := float32(math.Abs(float64(x)))
if absX <= 1 { if absX <= 1 {
y = absX*absX*(factorA*absX+factorB) +factorC y = absX*absX*(factorA*absX+factorB) + factorC
} else if absX <= 2 { } else if absX <= 2 {
y = absX*(absX*(absX*factorD+factorE)+factorF) + factorG y = absX*(absX*(absX*factorD+factorE)+factorF) + factorG
} else { } else {