Move splineKernel function nearer to Lanczos definitions.
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parent
c1b8c4986e
commit
9e5ed35b85
24
filters.go
24
filters.go
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@ -198,7 +198,19 @@ func Bilinear(img image.Image, factor [2]float32) Filter {
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})
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}
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// Bicubic interpolation (with cubic hermite spline)
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func Bicubic(img image.Image, factor [2]float32) Filter {
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return createFilter(img, factor, 4, splineKernel(0, 0.5))
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}
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// Mitchell-Netravali interpolation
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func MitchellNetravali(img image.Image, factor [2]float32) Filter {
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return createFilter(img, factor, 4, splineKernel(1.0/3.0, 1.0/3.0))
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}
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func splineKernel(B, C float32) func(float32) float32 {
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const lanczosTableSize = 300
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factorA := 2.0 - 1.5*B - C
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factorB := -3.0 + 2.0*B + C
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factorC := 1.0 - 1.0/3.0*B
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@ -220,16 +232,6 @@ func splineKernel(B, C float32) func(float32) float32 {
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}
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}
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// Bicubic interpolation (with cubic hermite spline)
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func Bicubic(img image.Image, factor [2]float32) Filter {
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return createFilter(img, factor, 4, splineKernel(0, 0.5))
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}
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// Mitchell-Netravali interpolation
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func MitchellNetravali(img image.Image, factor [2]float32) Filter {
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return createFilter(img, factor, 4, splineKernel(1.0/3.0, 1.0/3.0))
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}
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func lanczosKernel(a uint) func(float32) float32 {
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return func(x float32) (y float32) {
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if x > -float32(a) && x < float32(a) {
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@ -242,8 +244,6 @@ func lanczosKernel(a uint) func(float32) float32 {
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}
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}
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const lanczosTableSize = 300
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// Lanczos interpolation (a=2)
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func Lanczos2(img image.Image, factor [2]float32) Filter {
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return createFilter(img, factor, 4,
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