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path: root/Godeps/_workspace/src/github.com/nfnt/resize/converter.go
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Diffstat (limited to 'Godeps/_workspace/src/github.com/nfnt/resize/converter.go')
-rw-r--r--Godeps/_workspace/src/github.com/nfnt/resize/converter.go452
1 files changed, 0 insertions, 452 deletions
diff --git a/Godeps/_workspace/src/github.com/nfnt/resize/converter.go b/Godeps/_workspace/src/github.com/nfnt/resize/converter.go
deleted file mode 100644
index b3dd06b8d..000000000
--- a/Godeps/_workspace/src/github.com/nfnt/resize/converter.go
+++ /dev/null
@@ -1,452 +0,0 @@
-/*
-Copyright (c) 2012, Jan Schlicht <jan.schlicht@gmail.com>
-
-Permission to use, copy, modify, and/or distribute this software for any purpose
-with or without fee is hereby granted, provided that the above copyright notice
-and this permission notice appear in all copies.
-
-THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
-REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
-FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
-INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
-OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
-TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
-THIS SOFTWARE.
-*/
-
-package resize
-
-import "image"
-
-// Keep value in [0,255] range.
-func clampUint8(in int32) uint8 {
- // casting a negative int to an uint will result in an overflown
- // large uint. this behavior will be exploited here and in other functions
- // to achieve a higher performance.
- if uint32(in) < 256 {
- return uint8(in)
- }
- if in > 255 {
- return 255
- }
- return 0
-}
-
-// Keep value in [0,65535] range.
-func clampUint16(in int64) uint16 {
- if uint64(in) < 65536 {
- return uint16(in)
- }
- if in > 65535 {
- return 65535
- }
- return 0
-}
-
-func resizeGeneric(in image.Image, out *image.NRGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
- newBounds := out.Bounds()
- maxX := in.Bounds().Dx() - 1
-
- for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
- for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
- var rgba [4]int64
- var sum int64
- start := offset[y]
- ci := y * filterLength
- for i := 0; i < filterLength; i++ {
- coeff := coeffs[ci+i]
- if coeff != 0 {
- xi := start + i
- switch {
- case xi < 0:
- xi = 0
- case xi >= maxX:
- xi = maxX
- }
- r, g, b, a := in.At(xi+in.Bounds().Min.X, x+in.Bounds().Min.Y).RGBA()
-
- // reverse alpha-premultiplication.
- if a != 0 {
- r *= 0xffff
- r /= a
- g *= 0xffff
- g /= a
- b *= 0xffff
- b /= a
- }
-
- rgba[0] += int64(coeff) * int64(r)
- rgba[1] += int64(coeff) * int64(g)
- rgba[2] += int64(coeff) * int64(b)
- rgba[3] += int64(coeff) * int64(a)
- sum += int64(coeff)
- }
- }
-
- offset := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
- value := clampUint16(rgba[0] / sum)
- out.Pix[offset+0] = uint8(value >> 8)
- out.Pix[offset+1] = uint8(value)
- value = clampUint16(rgba[1] / sum)
- out.Pix[offset+2] = uint8(value >> 8)
- out.Pix[offset+3] = uint8(value)
- value = clampUint16(rgba[2] / sum)
- out.Pix[offset+4] = uint8(value >> 8)
- out.Pix[offset+5] = uint8(value)
- value = clampUint16(rgba[3] / sum)
- out.Pix[offset+6] = uint8(value >> 8)
- out.Pix[offset+7] = uint8(value)
- }
- }
-}
-
-func resizeRGBA(in *image.RGBA, out *image.NRGBA, scale float64, coeffs []int16, offset []int, filterLength int) {
- newBounds := out.Bounds()
- maxX := in.Bounds().Dx() - 1
-
- for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
- row := in.Pix[x*in.Stride:]
- for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
- var rgba [4]int32
- var sum int32
- start := offset[y]
- ci := y * filterLength
- for i := 0; i < filterLength; i++ {
- coeff := coeffs[ci+i]
- if coeff != 0 {
- xi := start + i
- switch {
- case uint(xi) < uint(maxX):
- xi *= 4
- case xi >= maxX:
- xi = 4 * maxX
- default:
- xi = 0
- }
-
- r := uint32(row[xi+0])
- g := uint32(row[xi+1])
- b := uint32(row[xi+2])
- a := uint32(row[xi+3])
-
- // reverse alpha-premultiplication.
- if a != 0 {
- r *= 0xff
- r /= a
- g *= 0xff
- g /= a
- b *= 0xff
- b /= a
- }
-
- rgba[0] += int32(coeff) * int32(r)
- rgba[1] += int32(coeff) * int32(g)
- rgba[2] += int32(coeff) * int32(b)
- rgba[3] += int32(coeff) * int32(a)
- sum += int32(coeff)
- }
- }
-
- xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
- out.Pix[xo+0] = clampUint8(rgba[0] / sum)
- out.Pix[xo+1] = clampUint8(rgba[1] / sum)
- out.Pix[xo+2] = clampUint8(rgba[2] / sum)
- out.Pix[xo+3] = clampUint8(rgba[3] / sum)
- }
- }
-}
-
-func resizeNRGBA(in *image.NRGBA, out *image.NRGBA, scale float64, coeffs []int16, offset []int, filterLength int) {
- newBounds := out.Bounds()
- maxX := in.Bounds().Dx() - 1
-
- for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
- row := in.Pix[x*in.Stride:]
- for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
- var rgba [4]int32
- var sum int32
- start := offset[y]
- ci := y * filterLength
- for i := 0; i < filterLength; i++ {
- coeff := coeffs[ci+i]
- if coeff != 0 {
- xi := start + i
- switch {
- case uint(xi) < uint(maxX):
- xi *= 4
- case xi >= maxX:
- xi = 4 * maxX
- default:
- xi = 0
- }
- rgba[0] += int32(coeff) * int32(row[xi+0])
- rgba[1] += int32(coeff) * int32(row[xi+1])
- rgba[2] += int32(coeff) * int32(row[xi+2])
- rgba[3] += int32(coeff) * int32(row[xi+3])
- sum += int32(coeff)
- }
- }
-
- xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*4
- out.Pix[xo+0] = clampUint8(rgba[0] / sum)
- out.Pix[xo+1] = clampUint8(rgba[1] / sum)
- out.Pix[xo+2] = clampUint8(rgba[2] / sum)
- out.Pix[xo+3] = clampUint8(rgba[3] / sum)
- }
- }
-}
-
-func resizeRGBA64(in *image.RGBA64, out *image.NRGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
- newBounds := out.Bounds()
- maxX := in.Bounds().Dx() - 1
-
- for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
- row := in.Pix[x*in.Stride:]
- for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
- var rgba [4]int64
- var sum int64
- start := offset[y]
- ci := y * filterLength
- for i := 0; i < filterLength; i++ {
- coeff := coeffs[ci+i]
- if coeff != 0 {
- xi := start + i
- switch {
- case uint(xi) < uint(maxX):
- xi *= 8
- case xi >= maxX:
- xi = 8 * maxX
- default:
- xi = 0
- }
-
- r := uint32(uint16(row[xi+0])<<8 | uint16(row[xi+1]))
- g := uint32(uint16(row[xi+2])<<8 | uint16(row[xi+3]))
- b := uint32(uint16(row[xi+4])<<8 | uint16(row[xi+5]))
- a := uint32(uint16(row[xi+6])<<8 | uint16(row[xi+7]))
-
- // reverse alpha-premultiplication.
- if a != 0 {
- r *= 0xffff
- r /= a
- g *= 0xffff
- g /= a
- b *= 0xffff
- b /= a
- }
-
- rgba[0] += int64(coeff) * int64(r)
- rgba[1] += int64(coeff) * int64(g)
- rgba[2] += int64(coeff) * int64(b)
- rgba[3] += int64(coeff) * int64(a)
- sum += int64(coeff)
- }
- }
-
- xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
- value := clampUint16(rgba[0] / sum)
- out.Pix[xo+0] = uint8(value >> 8)
- out.Pix[xo+1] = uint8(value)
- value = clampUint16(rgba[1] / sum)
- out.Pix[xo+2] = uint8(value >> 8)
- out.Pix[xo+3] = uint8(value)
- value = clampUint16(rgba[2] / sum)
- out.Pix[xo+4] = uint8(value >> 8)
- out.Pix[xo+5] = uint8(value)
- value = clampUint16(rgba[3] / sum)
- out.Pix[xo+6] = uint8(value >> 8)
- out.Pix[xo+7] = uint8(value)
- }
- }
-}
-
-func resizeNRGBA64(in *image.NRGBA64, out *image.NRGBA64, scale float64, coeffs []int32, offset []int, filterLength int) {
- newBounds := out.Bounds()
- maxX := in.Bounds().Dx() - 1
-
- for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
- row := in.Pix[x*in.Stride:]
- for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
- var rgba [4]int64
- var sum int64
- start := offset[y]
- ci := y * filterLength
- for i := 0; i < filterLength; i++ {
- coeff := coeffs[ci+i]
- if coeff != 0 {
- xi := start + i
- switch {
- case uint(xi) < uint(maxX):
- xi *= 8
- case xi >= maxX:
- xi = 8 * maxX
- default:
- xi = 0
- }
- rgba[0] += int64(coeff) * int64(uint16(row[xi+0])<<8|uint16(row[xi+1]))
- rgba[1] += int64(coeff) * int64(uint16(row[xi+2])<<8|uint16(row[xi+3]))
- rgba[2] += int64(coeff) * int64(uint16(row[xi+4])<<8|uint16(row[xi+5]))
- rgba[3] += int64(coeff) * int64(uint16(row[xi+6])<<8|uint16(row[xi+7]))
- sum += int64(coeff)
- }
- }
-
- xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*8
- value := clampUint16(rgba[0] / sum)
- out.Pix[xo+0] = uint8(value >> 8)
- out.Pix[xo+1] = uint8(value)
- value = clampUint16(rgba[1] / sum)
- out.Pix[xo+2] = uint8(value >> 8)
- out.Pix[xo+3] = uint8(value)
- value = clampUint16(rgba[2] / sum)
- out.Pix[xo+4] = uint8(value >> 8)
- out.Pix[xo+5] = uint8(value)
- value = clampUint16(rgba[3] / sum)
- out.Pix[xo+6] = uint8(value >> 8)
- out.Pix[xo+7] = uint8(value)
- }
- }
-}
-
-func resizeGray(in *image.Gray, out *image.Gray, scale float64, coeffs []int16, offset []int, filterLength int) {
- newBounds := out.Bounds()
- maxX := in.Bounds().Dx() - 1
-
- for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
- row := in.Pix[(x-newBounds.Min.X)*in.Stride:]
- for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
- var gray int32
- var sum int32
- start := offset[y]
- ci := y * filterLength
- for i := 0; i < filterLength; i++ {
- coeff := coeffs[ci+i]
- if coeff != 0 {
- xi := start + i
- switch {
- case xi < 0:
- xi = 0
- case xi >= maxX:
- xi = maxX
- }
- gray += int32(coeff) * int32(row[xi])
- sum += int32(coeff)
- }
- }
-
- offset := (y-newBounds.Min.Y)*out.Stride + (x - newBounds.Min.X)
- out.Pix[offset] = clampUint8(gray / sum)
- }
- }
-}
-
-func resizeGray16(in *image.Gray16, out *image.Gray16, scale float64, coeffs []int32, offset []int, filterLength int) {
- newBounds := out.Bounds()
- maxX := in.Bounds().Dx() - 1
-
- for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
- row := in.Pix[x*in.Stride:]
- for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
- var gray int64
- var sum int64
- start := offset[y]
- ci := y * filterLength
- for i := 0; i < filterLength; i++ {
- coeff := coeffs[ci+i]
- if coeff != 0 {
- xi := start + i
- switch {
- case uint(xi) < uint(maxX):
- xi *= 2
- case xi >= maxX:
- xi = 2 * maxX
- default:
- xi = 0
- }
- gray += int64(coeff) * int64(uint16(row[xi+0])<<8|uint16(row[xi+1]))
- sum += int64(coeff)
- }
- }
-
- offset := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*2
- value := clampUint16(gray / sum)
- out.Pix[offset+0] = uint8(value >> 8)
- out.Pix[offset+1] = uint8(value)
- }
- }
-}
-
-func resizeYCbCr(in *ycc, out *ycc, scale float64, coeffs []int16, offset []int, filterLength int) {
- newBounds := out.Bounds()
- maxX := in.Bounds().Dx() - 1
-
- for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
- row := in.Pix[x*in.Stride:]
- for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
- var p [3]int32
- var sum int32
- start := offset[y]
- ci := y * filterLength
- for i := 0; i < filterLength; i++ {
- coeff := coeffs[ci+i]
- if coeff != 0 {
- xi := start + i
- switch {
- case uint(xi) < uint(maxX):
- xi *= 3
- case xi >= maxX:
- xi = 3 * maxX
- default:
- xi = 0
- }
- p[0] += int32(coeff) * int32(row[xi+0])
- p[1] += int32(coeff) * int32(row[xi+1])
- p[2] += int32(coeff) * int32(row[xi+2])
- sum += int32(coeff)
- }
- }
-
- xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*3
- out.Pix[xo+0] = clampUint8(p[0] / sum)
- out.Pix[xo+1] = clampUint8(p[1] / sum)
- out.Pix[xo+2] = clampUint8(p[2] / sum)
- }
- }
-}
-
-func nearestYCbCr(in *ycc, out *ycc, scale float64, coeffs []bool, offset []int, filterLength int) {
- newBounds := out.Bounds()
- maxX := in.Bounds().Dx() - 1
-
- for x := newBounds.Min.X; x < newBounds.Max.X; x++ {
- row := in.Pix[x*in.Stride:]
- for y := newBounds.Min.Y; y < newBounds.Max.Y; y++ {
- var p [3]float32
- var sum float32
- start := offset[y]
- ci := y * filterLength
- for i := 0; i < filterLength; i++ {
- if coeffs[ci+i] {
- xi := start + i
- switch {
- case uint(xi) < uint(maxX):
- xi *= 3
- case xi >= maxX:
- xi = 3 * maxX
- default:
- xi = 0
- }
- p[0] += float32(row[xi+0])
- p[1] += float32(row[xi+1])
- p[2] += float32(row[xi+2])
- sum++
- }
- }
-
- xo := (y-newBounds.Min.Y)*out.Stride + (x-newBounds.Min.X)*3
- out.Pix[xo+0] = floatToUint8(p[0] / sum)
- out.Pix[xo+1] = floatToUint8(p[1] / sum)
- out.Pix[xo+2] = floatToUint8(p[2] / sum)
- }
- }
-}
generated by cgit v1.2.3-1-g7c22 (git 2.25.1) at 2024-07-18 12:26:09 +0000