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authorWim <wim@42.be>2021-10-17 00:47:22 +0200
committerGitHub <noreply@github.com>2021-10-17 00:47:22 +0200
commit4dd8bae5c91fa4aef09d865d8fef1acd84f90925 (patch)
treeffad9b242daccaf8c86d1c1fbd59032302bd3be9 /vendor/github.com/disintegration/imaging/adjust.go
parent7ae45c42e712bd0e66c101f3f714c05aa1dc2104 (diff)
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Update dependencies (#1610)
* Update dependencies * Update module to go 1.17
Diffstat (limited to 'vendor/github.com/disintegration/imaging/adjust.go')
-rw-r--r--vendor/github.com/disintegration/imaging/adjust.go253
1 files changed, 0 insertions, 253 deletions
diff --git a/vendor/github.com/disintegration/imaging/adjust.go b/vendor/github.com/disintegration/imaging/adjust.go
deleted file mode 100644
index daaf1de8..00000000
--- a/vendor/github.com/disintegration/imaging/adjust.go
+++ /dev/null
@@ -1,253 +0,0 @@
-package imaging
-
-import (
- "image"
- "image/color"
- "math"
-)
-
-// Grayscale produces a grayscale version of the image.
-func Grayscale(img image.Image) *image.NRGBA {
- src := newScanner(img)
- dst := image.NewNRGBA(image.Rect(0, 0, src.w, src.h))
- parallel(0, src.h, func(ys <-chan int) {
- for y := range ys {
- i := y * dst.Stride
- src.scan(0, y, src.w, y+1, dst.Pix[i:i+src.w*4])
- for x := 0; x < src.w; x++ {
- d := dst.Pix[i : i+3 : i+3]
- r := d[0]
- g := d[1]
- b := d[2]
- f := 0.299*float64(r) + 0.587*float64(g) + 0.114*float64(b)
- y := uint8(f + 0.5)
- d[0] = y
- d[1] = y
- d[2] = y
- i += 4
- }
- }
- })
- return dst
-}
-
-// Invert produces an inverted (negated) version of the image.
-func Invert(img image.Image) *image.NRGBA {
- src := newScanner(img)
- dst := image.NewNRGBA(image.Rect(0, 0, src.w, src.h))
- parallel(0, src.h, func(ys <-chan int) {
- for y := range ys {
- i := y * dst.Stride
- src.scan(0, y, src.w, y+1, dst.Pix[i:i+src.w*4])
- for x := 0; x < src.w; x++ {
- d := dst.Pix[i : i+3 : i+3]
- d[0] = 255 - d[0]
- d[1] = 255 - d[1]
- d[2] = 255 - d[2]
- i += 4
- }
- }
- })
- return dst
-}
-
-// AdjustSaturation changes the saturation of the image using the percentage parameter and returns the adjusted image.
-// The percentage must be in the range (-100, 100).
-// The percentage = 0 gives the original image.
-// The percentage = 100 gives the image with the saturation value doubled for each pixel.
-// The percentage = -100 gives the image with the saturation value zeroed for each pixel (grayscale).
-//
-// Examples:
-// dstImage = imaging.AdjustSaturation(srcImage, 25) // Increase image saturation by 25%.
-// dstImage = imaging.AdjustSaturation(srcImage, -10) // Decrease image saturation by 10%.
-//
-func AdjustSaturation(img image.Image, percentage float64) *image.NRGBA {
- percentage = math.Min(math.Max(percentage, -100), 100)
- multiplier := 1 + percentage/100
-
- return AdjustFunc(img, func(c color.NRGBA) color.NRGBA {
- h, s, l := rgbToHSL(c.R, c.G, c.B)
- s *= multiplier
- if s > 1 {
- s = 1
- }
- r, g, b := hslToRGB(h, s, l)
- return color.NRGBA{r, g, b, c.A}
- })
-}
-
-// AdjustContrast changes the contrast of the image using the percentage parameter and returns the adjusted image.
-// The percentage must be in range (-100, 100). The percentage = 0 gives the original image.
-// The percentage = -100 gives solid gray image.
-//
-// Examples:
-//
-// dstImage = imaging.AdjustContrast(srcImage, -10) // Decrease image contrast by 10%.
-// dstImage = imaging.AdjustContrast(srcImage, 20) // Increase image contrast by 20%.
-//
-func AdjustContrast(img image.Image, percentage float64) *image.NRGBA {
- percentage = math.Min(math.Max(percentage, -100.0), 100.0)
- lut := make([]uint8, 256)
-
- v := (100.0 + percentage) / 100.0
- for i := 0; i < 256; i++ {
- switch {
- case 0 <= v && v <= 1:
- lut[i] = clamp((0.5 + (float64(i)/255.0-0.5)*v) * 255.0)
- case 1 < v && v < 2:
- lut[i] = clamp((0.5 + (float64(i)/255.0-0.5)*(1/(2.0-v))) * 255.0)
- default:
- lut[i] = uint8(float64(i)/255.0+0.5) * 255
- }
- }
-
- return adjustLUT(img, lut)
-}
-
-// AdjustBrightness changes the brightness of the image using the percentage parameter and returns the adjusted image.
-// The percentage must be in range (-100, 100). The percentage = 0 gives the original image.
-// The percentage = -100 gives solid black image. The percentage = 100 gives solid white image.
-//
-// Examples:
-//
-// dstImage = imaging.AdjustBrightness(srcImage, -15) // Decrease image brightness by 15%.
-// dstImage = imaging.AdjustBrightness(srcImage, 10) // Increase image brightness by 10%.
-//
-func AdjustBrightness(img image.Image, percentage float64) *image.NRGBA {
- percentage = math.Min(math.Max(percentage, -100.0), 100.0)
- lut := make([]uint8, 256)
-
- shift := 255.0 * percentage / 100.0
- for i := 0; i < 256; i++ {
- lut[i] = clamp(float64(i) + shift)
- }
-
- return adjustLUT(img, lut)
-}
-
-// AdjustGamma performs a gamma correction on the image and returns the adjusted image.
-// Gamma parameter must be positive. Gamma = 1.0 gives the original image.
-// Gamma less than 1.0 darkens the image and gamma greater than 1.0 lightens it.
-//
-// Example:
-//
-// dstImage = imaging.AdjustGamma(srcImage, 0.7)
-//
-func AdjustGamma(img image.Image, gamma float64) *image.NRGBA {
- e := 1.0 / math.Max(gamma, 0.0001)
- lut := make([]uint8, 256)
-
- for i := 0; i < 256; i++ {
- lut[i] = clamp(math.Pow(float64(i)/255.0, e) * 255.0)
- }
-
- return adjustLUT(img, lut)
-}
-
-// AdjustSigmoid changes the contrast of the image using a sigmoidal function and returns the adjusted image.
-// It's a non-linear contrast change useful for photo adjustments as it preserves highlight and shadow detail.
-// The midpoint parameter is the midpoint of contrast that must be between 0 and 1, typically 0.5.
-// The factor parameter indicates how much to increase or decrease the contrast, typically in range (-10, 10).
-// If the factor parameter is positive the image contrast is increased otherwise the contrast is decreased.
-//
-// Examples:
-//
-// dstImage = imaging.AdjustSigmoid(srcImage, 0.5, 3.0) // Increase the contrast.
-// dstImage = imaging.AdjustSigmoid(srcImage, 0.5, -3.0) // Decrease the contrast.
-//
-func AdjustSigmoid(img image.Image, midpoint, factor float64) *image.NRGBA {
- if factor == 0 {
- return Clone(img)
- }
-
- lut := make([]uint8, 256)
- a := math.Min(math.Max(midpoint, 0.0), 1.0)
- b := math.Abs(factor)
- sig0 := sigmoid(a, b, 0)
- sig1 := sigmoid(a, b, 1)
- e := 1.0e-6
-
- if factor > 0 {
- for i := 0; i < 256; i++ {
- x := float64(i) / 255.0
- sigX := sigmoid(a, b, x)
- f := (sigX - sig0) / (sig1 - sig0)
- lut[i] = clamp(f * 255.0)
- }
- } else {
- for i := 0; i < 256; i++ {
- x := float64(i) / 255.0
- arg := math.Min(math.Max((sig1-sig0)*x+sig0, e), 1.0-e)
- f := a - math.Log(1.0/arg-1.0)/b
- lut[i] = clamp(f * 255.0)
- }
- }
-
- return adjustLUT(img, lut)
-}
-
-func sigmoid(a, b, x float64) float64 {
- return 1 / (1 + math.Exp(b*(a-x)))
-}
-
-// adjustLUT applies the given lookup table to the colors of the image.
-func adjustLUT(img image.Image, lut []uint8) *image.NRGBA {
- src := newScanner(img)
- dst := image.NewNRGBA(image.Rect(0, 0, src.w, src.h))
- lut = lut[0:256]
- parallel(0, src.h, func(ys <-chan int) {
- for y := range ys {
- i := y * dst.Stride
- src.scan(0, y, src.w, y+1, dst.Pix[i:i+src.w*4])
- for x := 0; x < src.w; x++ {
- d := dst.Pix[i : i+3 : i+3]
- d[0] = lut[d[0]]
- d[1] = lut[d[1]]
- d[2] = lut[d[2]]
- i += 4
- }
- }
- })
- return dst
-}
-
-// AdjustFunc applies the fn function to each pixel of the img image and returns the adjusted image.
-//
-// Example:
-//
-// dstImage = imaging.AdjustFunc(
-// srcImage,
-// func(c color.NRGBA) color.NRGBA {
-// // Shift the red channel by 16.
-// r := int(c.R) + 16
-// if r > 255 {
-// r = 255
-// }
-// return color.NRGBA{uint8(r), c.G, c.B, c.A}
-// }
-// )
-//
-func AdjustFunc(img image.Image, fn func(c color.NRGBA) color.NRGBA) *image.NRGBA {
- src := newScanner(img)
- dst := image.NewNRGBA(image.Rect(0, 0, src.w, src.h))
- parallel(0, src.h, func(ys <-chan int) {
- for y := range ys {
- i := y * dst.Stride
- src.scan(0, y, src.w, y+1, dst.Pix[i:i+src.w*4])
- for x := 0; x < src.w; x++ {
- d := dst.Pix[i : i+4 : i+4]
- r := d[0]
- g := d[1]
- b := d[2]
- a := d[3]
- c := fn(color.NRGBA{r, g, b, a})
- d[0] = c.R
- d[1] = c.G
- d[2] = c.B
- d[3] = c.A
- i += 4
- }
- }
- })
- return dst
-}