Add support for nearest-neighbor resize of NRGBA, NRGBA64 images.
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parent
79dc2b616d
commit
beee5e27fe
58
resize.go
58
resize.go
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@ -375,6 +375,35 @@ func resizeNearest(width, height uint, scaleX, scaleY float64, img image.Image,
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}
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wg.Wait()
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return result
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case *image.NRGBA:
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// 8-bit precision
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temp := image.NewNRGBA(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
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result := image.NewNRGBA(image.Rect(0, 0, int(width), int(height)))
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// horizontal filter, results in transposed temporary image
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coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
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wg.Add(cpus)
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for i := 0; i < cpus; i++ {
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slice := makeSlice(temp, i, cpus).(*image.RGBA)
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go func() {
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defer wg.Done()
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nearestNRGBA(input, slice, scaleX, coeffs, offset, filterLength)
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}()
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}
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wg.Wait()
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// horizontal filter on transposed image, result is not transposed
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coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
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wg.Add(cpus)
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for i := 0; i < cpus; i++ {
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slice := makeSlice(result, i, cpus).(*image.RGBA)
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go func() {
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defer wg.Done()
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nearestNRGBA(temp, slice, scaleY, coeffs, offset, filterLength)
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}()
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}
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wg.Wait()
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return result
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case *image.YCbCr:
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// 8-bit precision
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// accessing the YCbCr arrays in a tight loop is slow.
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@ -434,6 +463,35 @@ func resizeNearest(width, height uint, scaleX, scaleY float64, img image.Image,
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}
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wg.Wait()
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return result
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case *image.NRGBA64:
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// 16-bit precision
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temp := image.NewNRGBA64(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
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result := image.NewNRGBA64(image.Rect(0, 0, int(width), int(height)))
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// horizontal filter, results in transposed temporary image
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coeffs, offset, filterLength := createWeightsNearest(temp.Bounds().Dy(), taps, blur, scaleX)
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wg.Add(cpus)
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for i := 0; i < cpus; i++ {
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slice := makeSlice(temp, i, cpus).(*image.RGBA64)
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go func() {
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defer wg.Done()
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nearestNRGBA64(input, slice, scaleX, coeffs, offset, filterLength)
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}()
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}
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wg.Wait()
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// horizontal filter on transposed image, result is not transposed
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coeffs, offset, filterLength = createWeightsNearest(result.Bounds().Dy(), taps, blur, scaleY)
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wg.Add(cpus)
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for i := 0; i < cpus; i++ {
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slice := makeSlice(result, i, cpus).(*image.RGBA64)
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go func() {
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defer wg.Done()
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nearestNRGBA64(temp, slice, scaleY, coeffs, offset, filterLength)
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}()
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}
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wg.Wait()
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return result
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case *image.Gray:
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// 8-bit precision
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temp := image.NewGray(image.Rect(0, 0, input.Bounds().Dy(), int(width)))
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