Center the resized image on the canvas, instead of shifting it slightly
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1169a8bfc3
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@ -66,6 +66,8 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
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resizedImg := image.NewRGBA64(image.Rect(0, 0, int(oldWidth/scaleX), int(oldHeight/scaleY)))
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b := resizedImg.Bounds()
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adjustX := 0.5 * ((oldWidth-1.0)/scaleX - float32(b.Dx()-1))
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adjustY := 0.5 * ((oldHeight-1.0)/scaleY - float32(b.Dy()-1))
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n := numJobs(b.Dy())
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c := make(chan int, n)
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@ -76,7 +78,7 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
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var color color.RGBA64
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for y := b.Min.Y; y < b.Max.Y; y++ {
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for x := b.Min.X; x < b.Max.X; x++ {
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u, v = t.Eval(float32(x), float32(y))
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u, v = t.Eval(float32(x)+adjustX, float32(y)+adjustY)
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//resizedImg.SetRGBA64(x, y, filter.Interpolate(u, v))
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color = filter.Interpolate(u, v)
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i := resizedImg.PixOffset(x, y)
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@ -16,7 +16,7 @@ func init() {
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func Test_Nearest(t *testing.T) {
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m := Resize(6, 0, img, NearestNeighbor)
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if m.At(2, 2) == m.At(3, 3) {
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if m.At(1, 1) == m.At(2, 2) {
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t.Fail()
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}
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}
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