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css_color_spaces.go
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css_color_spaces.go
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package css_parser
import (
"math"
"github.com/evanw/esbuild/internal/helpers"
)
// Wrap float64 math to avoid compiler optimizations that break determinism
type F64 = helpers.F64
// Reference: https://drafts.csswg.org/css-color/#color-conversion-code
type colorSpace uint8
const (
colorSpace_a98_rgb colorSpace = iota
colorSpace_display_p3
colorSpace_hsl
colorSpace_hwb
colorSpace_lab
colorSpace_lch
colorSpace_oklab
colorSpace_oklch
colorSpace_prophoto_rgb
colorSpace_rec2020
colorSpace_srgb
colorSpace_srgb_linear
colorSpace_xyz
colorSpace_xyz_d50
colorSpace_xyz_d65
)
func (colorSpace colorSpace) isPolar() bool {
switch colorSpace {
case colorSpace_hsl, colorSpace_hwb, colorSpace_lch, colorSpace_oklch:
return true
}
return false
}
type hueMethod uint8
const (
shorterHue hueMethod = iota
longerHue
increasingHue
decreasingHue
)
func lin_srgb(r F64, g F64, b F64) (F64, F64, F64) {
f := func(val F64) F64 {
if abs := val.Abs(); abs.Value() < 0.04045 {
return val.DivConst(12.92)
} else {
return abs.AddConst(0.055).DivConst(1.055).PowConst(2.4).WithSignFrom(val)
}
}
return f(r), f(g), f(b)
}
func gam_srgb(r F64, g F64, b F64) (F64, F64, F64) {
f := func(val F64) F64 {
if abs := val.Abs(); abs.Value() > 0.0031308 {
return abs.PowConst(1 / 2.4).MulConst(1.055).SubConst(0.055).WithSignFrom(val)
} else {
return val.MulConst(12.92)
}
}
return f(r), f(g), f(b)
}
func lin_srgb_to_xyz(r F64, g F64, b F64) (F64, F64, F64) {
M := [9]float64{
506752.0 / 1228815, 87881.0 / 245763, 12673.0 / 70218,
87098.0 / 409605, 175762.0 / 245763, 12673.0 / 175545,
7918.0 / 409605, 87881.0 / 737289, 1001167.0 / 1053270,
}
return multiplyMatrices(M, r, g, b)
}
func xyz_to_lin_srgb(x F64, y F64, z F64) (F64, F64, F64) {
M := [9]float64{
12831.0 / 3959, -329.0 / 214, -1974.0 / 3959,
-851781.0 / 878810, 1648619.0 / 878810, 36519.0 / 878810,
705.0 / 12673, -2585.0 / 12673, 705.0 / 667,
}
return multiplyMatrices(M, x, y, z)
}
func lin_p3(r F64, g F64, b F64) (F64, F64, F64) {
return lin_srgb(r, g, b)
}
func gam_p3(r F64, g F64, b F64) (F64, F64, F64) {
return gam_srgb(r, g, b)
}
func lin_p3_to_xyz(r F64, g F64, b F64) (F64, F64, F64) {
M := [9]float64{
608311.0 / 1250200, 189793.0 / 714400, 198249.0 / 1000160,
35783.0 / 156275, 247089.0 / 357200, 198249.0 / 2500400,
0.0 / 1, 32229.0 / 714400, 5220557.0 / 5000800,
}
return multiplyMatrices(M, r, g, b)
}
func xyz_to_lin_p3(x F64, y F64, z F64) (F64, F64, F64) {
M := [9]float64{
446124.0 / 178915, -333277.0 / 357830, -72051.0 / 178915,
-14852.0 / 17905, 63121.0 / 35810, 423.0 / 17905,
11844.0 / 330415, -50337.0 / 660830, 316169.0 / 330415,
}
return multiplyMatrices(M, x, y, z)
}
func lin_prophoto(r F64, g F64, b F64) (F64, F64, F64) {
f := func(val F64) F64 {
const Et2 = 16.0 / 512
if abs := val.Abs(); abs.Value() <= Et2 {
return val.DivConst(16)
} else {
return abs.PowConst(1.8).WithSignFrom(val)
}
}
return f(r), f(g), f(b)
}
func gam_prophoto(r F64, g F64, b F64) (F64, F64, F64) {
f := func(val F64) F64 {
const Et = 1.0 / 512
if abs := val.Abs(); abs.Value() >= Et {
return abs.PowConst(1 / 1.8).WithSignFrom(val)
} else {
return val.MulConst(16)
}
}
return f(r), f(g), f(b)
}
func lin_prophoto_to_xyz(r F64, g F64, b F64) (F64, F64, F64) {
M := [9]float64{
0.7977604896723027, 0.13518583717574031, 0.0313493495815248,
0.2880711282292934, 0.7118432178101014, 0.00008565396060525902,
0.0, 0.0, 0.8251046025104601,
}
return multiplyMatrices(M, r, g, b)
}
func xyz_to_lin_prophoto(x F64, y F64, z F64) (F64, F64, F64) {
M := [9]float64{
1.3457989731028281, -0.25558010007997534, -0.05110628506753401,
-0.5446224939028347, 1.5082327413132781, 0.02053603239147973,
0.0, 0.0, 1.2119675456389454,
}
return multiplyMatrices(M, x, y, z)
}
func lin_a98rgb(r F64, g F64, b F64) (F64, F64, F64) {
f := func(val F64) F64 {
return val.Abs().PowConst(563.0 / 256).WithSignFrom(val)
}
return f(r), f(g), f(b)
}
func gam_a98rgb(r F64, g F64, b F64) (F64, F64, F64) {
f := func(val F64) F64 {
return val.Abs().PowConst(256.0 / 563).WithSignFrom(val)
}
return f(r), f(g), f(b)
}
func lin_a98rgb_to_xyz(r F64, g F64, b F64) (F64, F64, F64) {
M := [9]float64{
573536.0 / 994567, 263643.0 / 1420810, 187206.0 / 994567,
591459.0 / 1989134, 6239551.0 / 9945670, 374412.0 / 4972835,
53769.0 / 1989134, 351524.0 / 4972835, 4929758.0 / 4972835,
}
return multiplyMatrices(M, r, g, b)
}
func xyz_to_lin_a98rgb(x F64, y F64, z F64) (F64, F64, F64) {
M := [9]float64{
1829569.0 / 896150, -506331.0 / 896150, -308931.0 / 896150,
-851781.0 / 878810, 1648619.0 / 878810, 36519.0 / 878810,
16779.0 / 1248040, -147721.0 / 1248040, 1266979.0 / 1248040,
}
return multiplyMatrices(M, x, y, z)
}
func lin_2020(r F64, g F64, b F64) (F64, F64, F64) {
f := func(val F64) F64 {
const α = 1.09929682680944
const β = 0.018053968510807
if abs := val.Abs(); abs.Value() < β*4.5 {
return val.DivConst(4.5)
} else {
return abs.AddConst(α - 1).DivConst(α).PowConst(1 / 0.45).WithSignFrom(val)
}
}
return f(r), f(g), f(b)
}
func gam_2020(r F64, g F64, b F64) (F64, F64, F64) {
f := func(val F64) F64 {
const α = 1.09929682680944
const β = 0.018053968510807
if abs := val.Abs(); abs.Value() > β {
return abs.PowConst(0.45).MulConst(α).SubConst(α - 1).WithSignFrom(val)
} else {
return val.MulConst(4.5)
}
}
return f(r), f(g), f(b)
}
func lin_2020_to_xyz(r F64, g F64, b F64) (F64, F64, F64) {
var M = [9]float64{
63426534.0 / 99577255, 20160776.0 / 139408157, 47086771.0 / 278816314,
26158966.0 / 99577255, 472592308.0 / 697040785, 8267143.0 / 139408157,
0.0 / 1, 19567812.0 / 697040785, 295819943.0 / 278816314,
}
return multiplyMatrices(M, r, g, b)
}
func xyz_to_lin_2020(x F64, y F64, z F64) (F64, F64, F64) {
M := [9]float64{
30757411.0 / 17917100, -6372589.0 / 17917100, -4539589.0 / 17917100,
-19765991.0 / 29648200, 47925759.0 / 29648200, 467509.0 / 29648200,
792561.0 / 44930125, -1921689.0 / 44930125, 42328811.0 / 44930125,
}
return multiplyMatrices(M, x, y, z)
}
func d65_to_d50(x F64, y F64, z F64) (F64, F64, F64) {
M := [9]float64{
1.0479297925449969, 0.022946870601609652, -0.05019226628920524,
0.02962780877005599, 0.9904344267538799, -0.017073799063418826,
-0.009243040646204504, 0.015055191490298152, 0.7518742814281371,
}
return multiplyMatrices(M, x, y, z)
}
func d50_to_d65(x F64, y F64, z F64) (F64, F64, F64) {
M := [9]float64{
0.955473421488075, -0.02309845494876471, 0.06325924320057072,
-0.0283697093338637, 1.0099953980813041, 0.021041441191917323,
0.012314014864481998, -0.020507649298898964, 1.330365926242124,
}
return multiplyMatrices(M, x, y, z)
}
const d50_x = 0.3457 / 0.3585
const d50_z = (1.0 - 0.3457 - 0.3585) / 0.3585
func xyz_to_lab(x F64, y F64, z F64) (F64, F64, F64) {
const ε = 216.0 / 24389
const κ = 24389.0 / 27
x = x.DivConst(d50_x)
z = z.DivConst(d50_z)
var f0, f1, f2 F64
if x.Value() > ε {
f0 = x.Cbrt()
} else {
f0 = x.MulConst(κ).AddConst(16).DivConst(116)
}
if y.Value() > ε {
f1 = y.Cbrt()
} else {
f1 = y.MulConst(κ).AddConst(16).DivConst(116)
}
if z.Value() > ε {
f2 = z.Cbrt()
} else {
f2 = z.MulConst(κ).AddConst(16).DivConst(116)
}
return f1.MulConst(116).SubConst(16),
f0.Sub(f1).MulConst(500),
f1.Sub(f2).MulConst(200)
}
func lab_to_xyz(l F64, a F64, b F64) (x F64, y F64, z F64) {
const κ = 24389.0 / 27
const ε = 216.0 / 24389
f1 := l.AddConst(16).DivConst(116)
f0 := a.DivConst(500).Add(f1)
f2 := f1.Sub(b.DivConst(200))
f0_3 := f0.Cubed()
f2_3 := f2.Cubed()
if f0_3.Value() > ε {
x = f0_3
} else {
x = f0.MulConst(116).SubConst(16).DivConst(κ)
}
if l.Value() > κ*ε {
y = l.AddConst(16).DivConst(116)
y = y.Cubed()
} else {
y = l.DivConst(κ)
}
if f2_3.Value() > ε {
z = f2_3
} else {
z = f2.MulConst(116).SubConst(16).DivConst(κ)
}
return x.MulConst(d50_x), y, z.MulConst(d50_z)
}
func lab_to_lch(l F64, a F64, b F64) (F64, F64, F64) {
hue := b.Atan2(a).MulConst(180 / math.Pi)
if hue.Value() < 0 {
hue = hue.AddConst(360)
}
return l,
a.Squared().Add(b.Squared()).Sqrt(),
hue
}
func lch_to_lab(l F64, c F64, h F64) (F64, F64, F64) {
return l,
h.MulConst(math.Pi / 180).Cos().Mul(c),
h.MulConst(math.Pi / 180).Sin().Mul(c)
}
func xyz_to_oklab(x F64, y F64, z F64) (F64, F64, F64) {
XYZtoLMS := [9]float64{
0.8190224432164319, 0.3619062562801221, -0.12887378261216414,
0.0329836671980271, 0.9292868468965546, 0.03614466816999844,
0.048177199566046255, 0.26423952494422764, 0.6335478258136937,
}
LMStoOKLab := [9]float64{
0.2104542553, 0.7936177850, -0.0040720468,
1.9779984951, -2.4285922050, 0.4505937099,
0.0259040371, 0.7827717662, -0.8086757660,
}
l, m, s := multiplyMatrices(XYZtoLMS, x, y, z)
return multiplyMatrices(LMStoOKLab, l.Cbrt(), m.Cbrt(), s.Cbrt())
}
func oklab_to_xyz(l F64, a F64, b F64) (F64, F64, F64) {
LMStoXYZ := [9]float64{
1.2268798733741557, -0.5578149965554813, 0.28139105017721583,
-0.04057576262431372, 1.1122868293970594, -0.07171106666151701,
-0.07637294974672142, -0.4214933239627914, 1.5869240244272418,
}
OKLabtoLMS := [9]float64{
0.99999999845051981432, 0.39633779217376785678, 0.21580375806075880339,
1.0000000088817607767, -0.1055613423236563494, -0.063854174771705903402,
1.0000000546724109177, -0.089484182094965759684, -1.2914855378640917399,
}
l, m, s := multiplyMatrices(OKLabtoLMS, l, a, b)
return multiplyMatrices(LMStoXYZ, l.Cubed(), m.Cubed(), s.Cubed())
}
func oklab_to_oklch(l F64, a F64, b F64) (F64, F64, F64) {
return lab_to_lch(l, a, b)
}
func oklch_to_oklab(l F64, c F64, h F64) (F64, F64, F64) {
return lch_to_lab(l, c, h)
}
func multiplyMatrices(A [9]float64, b0 F64, b1 F64, b2 F64) (F64, F64, F64) {
return b0.MulConst(A[0]).Add(b1.MulConst(A[1])).Add(b2.MulConst(A[2])),
b0.MulConst(A[3]).Add(b1.MulConst(A[4])).Add(b2.MulConst(A[5])),
b0.MulConst(A[6]).Add(b1.MulConst(A[7])).Add(b2.MulConst(A[8]))
}
func delta_eok(L1 F64, a1 F64, b1 F64, L2 F64, a2 F64, b2 F64) F64 {
ΔL_sq := L1.Sub(L2).Squared()
Δa_sq := a1.Sub(a2).Squared()
Δb_sq := b1.Sub(b2).Squared()
return ΔL_sq.Add(Δa_sq).Add(Δb_sq).Sqrt()
}
func gamut_mapping_xyz_to_srgb(x F64, y F64, z F64) (F64, F64, F64) {
origin_l, origin_c, origin_h := oklab_to_oklch(xyz_to_oklab(x, y, z))
if origin_l.Value() >= 1 || origin_l.Value() <= 0 {
return origin_l, origin_l, origin_l
}
oklch_to_srgb := func(l F64, c F64, h F64) (F64, F64, F64) {
l, a, b := oklch_to_oklab(l, c, h)
x, y, z := oklab_to_xyz(l, a, b)
r, g, b := xyz_to_lin_srgb(x, y, z)
return gam_srgb(r, g, b)
}
srgb_to_oklab := func(r F64, g F64, b F64) (F64, F64, F64) {
r, g, b = lin_srgb(r, g, b)
x, y, z := lin_srgb_to_xyz(r, g, b)
return xyz_to_oklab(x, y, z)
}
inGamut := func(r F64, g F64, b F64) bool {
return r.Value() >= 0 && r.Value() <= 1 &&
g.Value() >= 0 && g.Value() <= 1 &&
b.Value() >= 0 && b.Value() <= 1
}
r, g, b := oklch_to_srgb(origin_l, origin_c, origin_h)
if inGamut(r, g, b) {
return r, g, b
}
const JND = 0.02
const epsilon = 0.0001
min := helpers.NewF64(0.0)
max := origin_c
clip := func(x F64) F64 {
if x.Value() < 0 {
return helpers.NewF64(0)
}
if x.Value() > 1 {
return helpers.NewF64(1)
}
return x
}
for max.Sub(min).Value() > epsilon {
chroma := min.Add(max).DivConst(2)
origin_c = chroma
r, g, b = oklch_to_srgb(origin_l, origin_c, origin_h)
if inGamut(r, g, b) {
min = chroma
continue
}
clipped_r, clipped_g, clipped_b := clip(r), clip(g), clip(b)
L1, a1, b1 := srgb_to_oklab(clipped_r, clipped_b, clipped_g)
L2, a2, b2 := srgb_to_oklab(r, g, b)
E := delta_eok(L1, a1, b1, L2, a2, b2)
if E.Value() < JND {
return clipped_r, clipped_g, clipped_b
}
max = chroma
}
return r, g, b
}
func hsl_to_rgb(hue F64, sat F64, light F64) (F64, F64, F64) {
hue = hue.DivConst(360)
hue = hue.Sub(hue.Floor())
hue = hue.MulConst(360)
sat = sat.DivConst(100)
light = light.DivConst(100)
f := func(n float64) F64 {
k := hue.DivConst(30).AddConst(n)
k = k.DivConst(12)
k = k.Sub(k.Floor())
k = k.MulConst(12)
a := helpers.Min2(light, light.Neg().AddConst(1)).Mul(sat)
return light.Sub(helpers.Max2(helpers.NewF64(-1), helpers.Min3(k.SubConst(3), k.Neg().AddConst(9), helpers.NewF64(1))).Mul(a))
}
return f(0), f(8), f(4)
}
func rgb_to_hsl(red F64, green F64, blue F64) (F64, F64, F64) {
max := helpers.Max3(red, green, blue)
min := helpers.Min3(red, green, blue)
hue, sat, light := helpers.NewF64(math.NaN()), helpers.NewF64(0.0), min.Add(max).DivConst(2)
d := max.Sub(min)
if d.Value() != 0 {
if div := helpers.Min2(light, light.Neg().AddConst(1)); div.Value() != 0 {
sat = max.Sub(light).Div(div)
}
switch max {
case red:
hue = green.Sub(blue).Div(d)
if green.Value() < blue.Value() {
hue = hue.AddConst(6)
}
case green:
hue = blue.Sub(red).Div(d).AddConst(2)
case blue:
hue = red.Sub(green).Div(d).AddConst(4)
}
hue = hue.MulConst(60)
}
return hue, sat.MulConst(100), light.MulConst(100)
}
func hwb_to_rgb(hue F64, white F64, black F64) (F64, F64, F64) {
white = white.DivConst(100)
black = black.DivConst(100)
if white.Add(black).Value() >= 1 {
gray := white.Div(white.Add(black))
return gray, gray, gray
}
delta := white.Add(black).Neg().AddConst(1)
r, g, b := hsl_to_rgb(hue, helpers.NewF64(100), helpers.NewF64(50))
r = delta.Mul(r).Add(white)
g = delta.Mul(g).Add(white)
b = delta.Mul(b).Add(white)
return r, g, b
}
func rgb_to_hwb(red F64, green F64, blue F64) (F64, F64, F64) {
h, _, _ := rgb_to_hsl(red, green, blue)
white := helpers.Min3(red, green, blue)
black := helpers.Max3(red, green, blue).Neg().AddConst(1)
return h, white.MulConst(100), black.MulConst(100)
}
func xyz_to_colorSpace(x F64, y F64, z F64, colorSpace colorSpace) (F64, F64, F64) {
switch colorSpace {
case colorSpace_a98_rgb:
return gam_a98rgb(xyz_to_lin_a98rgb(x, y, z))
case colorSpace_display_p3:
return gam_p3(xyz_to_lin_p3(x, y, z))
case colorSpace_hsl:
return rgb_to_hsl(gam_srgb(xyz_to_lin_srgb(x, y, z)))
case colorSpace_hwb:
return rgb_to_hwb(gam_srgb(xyz_to_lin_srgb(x, y, z)))
case colorSpace_lab:
return xyz_to_lab(d65_to_d50(x, y, z))
case colorSpace_lch:
return lab_to_lch(xyz_to_lab(d65_to_d50(x, y, z)))
case colorSpace_oklab:
return xyz_to_oklab(x, y, z)
case colorSpace_oklch:
return oklab_to_oklch(xyz_to_oklab(x, y, z))
case colorSpace_prophoto_rgb:
return gam_prophoto(xyz_to_lin_prophoto(d65_to_d50(x, y, z)))
case colorSpace_rec2020:
return gam_2020(xyz_to_lin_2020(x, y, z))
case colorSpace_srgb:
return gam_srgb(xyz_to_lin_srgb(x, y, z))
case colorSpace_srgb_linear:
return xyz_to_lin_srgb(x, y, z)
case colorSpace_xyz, colorSpace_xyz_d65:
return x, y, z
case colorSpace_xyz_d50:
return d65_to_d50(x, y, z)
default:
panic("Internal error")
}
}
func colorSpace_to_xyz(v0 F64, v1 F64, v2 F64, colorSpace colorSpace) (F64, F64, F64) {
switch colorSpace {
case colorSpace_a98_rgb:
return lin_a98rgb_to_xyz(lin_a98rgb(v0, v1, v2))
case colorSpace_display_p3:
return lin_p3_to_xyz(lin_p3(v0, v1, v2))
case colorSpace_hsl:
return lin_srgb_to_xyz(lin_srgb(hsl_to_rgb(v0, v1, v2)))
case colorSpace_hwb:
return lin_srgb_to_xyz(lin_srgb(hwb_to_rgb(v0, v1, v2)))
case colorSpace_lab:
return d50_to_d65(lab_to_xyz(v0, v1, v2))
case colorSpace_lch:
return d50_to_d65(lab_to_xyz(lch_to_lab(v0, v1, v2)))
case colorSpace_oklab:
return oklab_to_xyz(v0, v1, v2)
case colorSpace_oklch:
return oklab_to_xyz(oklch_to_oklab(v0, v1, v2))
case colorSpace_prophoto_rgb:
return d50_to_d65(lin_prophoto_to_xyz(lin_prophoto(v0, v1, v2)))
case colorSpace_rec2020:
return lin_2020_to_xyz(lin_2020(v0, v1, v2))
case colorSpace_srgb:
return lin_srgb_to_xyz(lin_srgb(v0, v1, v2))
case colorSpace_srgb_linear:
return lin_srgb_to_xyz(v0, v1, v2)
case colorSpace_xyz, colorSpace_xyz_d65:
return v0, v1, v2
case colorSpace_xyz_d50:
return d50_to_d65(v0, v1, v2)
default:
panic("Internal error")
}
}