LibGfx: Add color space conversions needed for CSS color interpolation
This commit is contained in:
Tim Ledbetter
Andreas Kling
parent
2777db5898
commit
1a2ee46efe
2 changed files with 512 additions and 0 deletions
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@ -4,11 +4,32 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Math.h>
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#include <LibGfx/Color.h>
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#include <LibGfx/ColorConversion.h>
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#include <math.h>
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namespace Gfx {
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ColorComponents color_to_srgb(Color color)
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{
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return {
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color.red() / 255.0f,
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color.green() / 255.0f,
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color.blue() / 255.0f,
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color.alpha() / 255.0f,
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};
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}
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Color srgb_to_color(ColorComponents const& components)
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{
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return Color(
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clamp(lroundf(components[0] * 255.0f), 0L, 255L),
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clamp(lroundf(components[1] * 255.0f), 0L, 255L),
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clamp(lroundf(components[2] * 255.0f), 0L, 255L),
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clamp(lroundf(components.alpha() * 255.0f), 0L, 255L));
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}
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// https://drafts.csswg.org/css-color-4/#predefined-sRGB
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents srgb_to_linear_srgb(ColorComponents const& srgb)
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@ -199,4 +220,451 @@ ColorComponents lab_to_xyz50(ColorComponents const& lab)
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return { x_n * x, y_n * y, z_n * z, lab.alpha() };
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}
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// https://drafts.csswg.org/css-color-4/#predefined-sRGB-linear
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents linear_srgb_to_xyz65(ColorComponents const& components)
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{
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float red = components[0];
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float green = components[1];
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float blue = components[2];
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return {
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0.4123907993f * red + 0.3575843394f * green + 0.1804807884f * blue,
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0.2126390059f * red + 0.7151686788f * green + 0.0721923154f * blue,
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0.0193308187f * red + 0.1191947798f * green + 0.9505321522f * blue,
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components.alpha(),
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};
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}
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents xyz65_to_xyz50(ColorComponents const& components)
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{
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float x = components[0];
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float y = components[1];
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float z = components[2];
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return {
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+1.0479298208f * x + 0.0229468746f * y - 0.0501922295f * z,
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+0.0296278156f * x + 0.9904344482f * y - 0.0170738250f * z,
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-0.0092430581f * x + 0.0150551448f * y + 0.7518742814f * z,
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components.alpha(),
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};
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}
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents xyz50_to_xyz65(ColorComponents const& components)
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{
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float x = components[0];
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float y = components[1];
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float z = components[2];
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return {
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+0.9554734528f * x - 0.0230985368f * y + 0.0632593086f * z,
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-0.0283697094f * x + 1.0099954580f * y + 0.0210415381f * z,
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+0.0123140016f * x - 0.0205076964f * y + 1.3303659366f * z,
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components.alpha(),
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};
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}
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents xyz65_to_oklab(ColorComponents const& components)
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{
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float x = components[0];
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float y = components[1];
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float z = components[2];
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float long_cone = cbrtf(0.8190224379967030f * x + 0.3619062600528904f * y - 0.1288737815209879f * z);
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float medium_cone = cbrtf(0.0329836539323885f * x + 0.9292868615863434f * y + 0.0361446663506424f * z);
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float short_cone = cbrtf(0.0481771893596242f * x + 0.2642395317527308f * y + 0.6335478284694309f * z);
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return {
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0.2104542683093140f * long_cone + 0.7936177747023054f * medium_cone - 0.0040720430116193f * short_cone,
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1.9779985324311684f * long_cone - 2.4285922420485799f * medium_cone + 0.4505937096174110f * short_cone,
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0.0259040424655478f * long_cone + 0.7827717124575296f * medium_cone - 0.8086757549230774f * short_cone,
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components.alpha(),
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};
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}
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents oklab_to_xyz65(ColorComponents const& components)
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{
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float lightness = components[0];
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float a = components[1];
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float b = components[2];
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float long_cone = lightness + 0.3963377774f * a + 0.2158037573f * b;
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float medium_cone = lightness - 0.1055613458f * a - 0.0638541728f * b;
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float short_cone = lightness - 0.0894841775f * a - 1.2914855480f * b;
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long_cone = long_cone * long_cone * long_cone;
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medium_cone = medium_cone * medium_cone * medium_cone;
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short_cone = short_cone * short_cone * short_cone;
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return {
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+1.2268798758459243f * long_cone - 0.5578149944602171f * medium_cone + 0.2813910456659647f * short_cone,
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-0.0405757452148008f * long_cone + 1.1122868032803170f * medium_cone - 0.0717110580655164f * short_cone,
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-0.0763729366746601f * long_cone - 0.4214933324022432f * medium_cone + 1.5869240198367816f * short_cone,
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components.alpha(),
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};
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}
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static ColorComponents rectangular_to_polar(ColorComponents const& components)
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{
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float a = components[1];
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float b = components[2];
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float chroma = sqrtf(a * a + b * b);
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float hue = atan2f(b, a) * 180.0f / AK::Pi<float>;
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if (hue < 0.0f)
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hue += 360.0f;
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return { components[0], chroma, hue, components.alpha() };
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}
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static ColorComponents polar_to_rectangular(ColorComponents const& components)
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{
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float chroma = components[1];
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float hue_radians = components[2] * AK::Pi<float> / 180.0f;
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return {
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components[0],
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chroma * cosf(hue_radians),
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chroma * sinf(hue_radians),
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components.alpha(),
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};
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}
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// https://drafts.csswg.org/css-color-4/#lab-to-lch
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ColorComponents oklab_to_oklch(ColorComponents const& components) { return rectangular_to_polar(components); }
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// https://drafts.csswg.org/css-color-4/#lch-to-lab
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ColorComponents oklch_to_oklab(ColorComponents const& components) { return polar_to_rectangular(components); }
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents xyz50_to_lab(ColorComponents const& components)
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{
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constexpr auto kappa = 24389.0 / 27.0;
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constexpr auto epsilon = 216.0 / 24389.0;
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// D50
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constexpr float x_n = 0.3457f / 0.3585f;
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constexpr float y_n = 1.0f;
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constexpr float z_n = (1.0f - 0.3457f - 0.3585f) / 0.3585f;
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auto f = [](float value) -> float {
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if (value > epsilon)
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return cbrtf(value);
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return static_cast<float>((kappa * value + 16.0) / 116.0);
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};
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float fx = f(components[0] / x_n);
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float fy = f(components[1] / y_n);
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float fz = f(components[2] / z_n);
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return {
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116.0f * fy - 16.0f,
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500.0f * (fx - fy),
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200.0f * (fy - fz),
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components.alpha(),
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};
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}
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// https://drafts.csswg.org/css-color-4/#lab-to-lch
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ColorComponents lab_to_lch(ColorComponents const& components) { return rectangular_to_polar(components); }
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// https://drafts.csswg.org/css-color-4/#lch-to-lab
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ColorComponents lch_to_lab(ColorComponents const& components) { return polar_to_rectangular(components); }
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// https://drafts.csswg.org/css-color-4/#rgb-to-hsl
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ColorComponents srgb_to_hsl(ColorComponents const& components)
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{
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float red = components[0];
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float green = components[1];
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float blue = components[2];
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float maximum = max(max(red, green), blue);
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float minimum = min(min(red, green), blue);
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float chroma = maximum - minimum;
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float lightness = (minimum + maximum) / 2.0f;
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float hue = 0.0f;
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float saturation = 0.0f;
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if (chroma != 0.0f) {
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if (lightness == 0.0f || lightness == 1.0f)
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saturation = 0.0f;
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else
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saturation = (maximum - lightness) / min(lightness, 1.0f - lightness);
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if (maximum == red)
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hue = (green - blue) / chroma + (green < blue ? 6.0f : 0.0f);
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else if (maximum == green)
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hue = (blue - red) / chroma + 2.0f;
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else
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hue = (red - green) / chroma + 4.0f;
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hue *= 60.0f;
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if (saturation < 0.0f) {
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hue += 180.0f;
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saturation = fabsf(saturation);
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}
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if (hue >= 360.0f)
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hue -= 360.0f;
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}
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return { hue, saturation, lightness, components.alpha() };
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}
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// https://drafts.csswg.org/css-color-4/#hwb-to-rgb
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ColorComponents hwb_to_srgb(ColorComponents const& components)
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{
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float hue = components[0];
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float whiteness = components[1];
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float blackness = components[2];
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if (whiteness + blackness >= 1.0f) {
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float gray = whiteness / (whiteness + blackness);
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return { gray, gray, gray, components.alpha() };
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}
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auto rgb = hsl_to_srgb({ hue, 1.0f, 0.5f, components.alpha() });
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float scale = 1.0f - whiteness - blackness;
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return {
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rgb[0] * scale + whiteness,
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rgb[1] * scale + whiteness,
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rgb[2] * scale + whiteness,
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components.alpha(),
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};
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}
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// https://drafts.csswg.org/css-color-4/#rgb-to-hwb
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ColorComponents srgb_to_hwb(ColorComponents const& components)
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{
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float red = components[0];
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float green = components[1];
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float blue = components[2];
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float maximum = max(max(red, green), blue);
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float minimum = min(min(red, green), blue);
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float chroma = maximum - minimum;
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float hue = 0.0f;
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if (chroma != 0.0f) {
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if (maximum == red)
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hue = ((green - blue) / chroma) + (green < blue ? 6.0f : 0.0f);
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else if (maximum == green)
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hue = (blue - red) / chroma + 2.0f;
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else
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hue = (red - green) / chroma + 4.0f;
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hue *= 60.0f;
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if (hue >= 360.0f)
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hue -= 360.0f;
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}
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return { hue, minimum, 1.0f - maximum, components.alpha() };
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}
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// https://drafts.csswg.org/css-color-4/#predefined-display-p3
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents linear_display_p3_to_display_p3(ColorComponents const& components)
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{
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auto to_gamma = [](float c) {
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float sign = c < 0 ? -1.0f : 1.0f;
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float absolute = abs(c);
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if (absolute > 0.0031308f)
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return sign * static_cast<float>(1.055 * pow(absolute, 1.0 / 2.4) - 0.055);
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return 12.92f * c;
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};
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return { to_gamma(components[0]), to_gamma(components[1]), to_gamma(components[2]), components.alpha() };
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}
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// https://drafts.csswg.org/css-color-4/#predefined-display-p3-linear
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents xyz65_to_linear_display_p3(ColorComponents const& components)
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{
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float x = components[0];
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float y = components[1];
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float z = components[2];
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return {
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+2.4934969119f * x - 0.9313836179f * y - 0.4027107845f * z,
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-0.8294889696f * x + 1.7626640603f * y + 0.0236246858f * z,
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+0.0358458302f * x - 0.0761723893f * y + 0.9568845240f * z,
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components.alpha(),
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};
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}
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// https://drafts.csswg.org/css-color-4/#predefined-a98-rgb
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents a98_rgb_to_linear_a98_rgb(ColorComponents const& components)
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{
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auto to_linear = [](float c) {
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float sign = c < 0.0f ? -1.0f : 1.0f;
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return sign * static_cast<float>(pow(abs(c), 563.0 / 256.0));
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};
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return { to_linear(components[0]), to_linear(components[1]), to_linear(components[2]), components.alpha() };
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}
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// https://drafts.csswg.org/css-color-4/#predefined-a98-rgb
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents linear_a98_rgb_to_a98_rgb(ColorComponents const& components)
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{
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auto to_gamma = [](float c) {
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float sign = c < 0.0f ? -1.0f : 1.0f;
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return sign * static_cast<float>(pow(abs(c), 256.0 / 563.0));
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};
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return { to_gamma(components[0]), to_gamma(components[1]), to_gamma(components[2]), components.alpha() };
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}
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// https://drafts.csswg.org/css-color-4/#predefined-a98-rgb
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents linear_a98_rgb_to_xyz65(ColorComponents const& components)
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{
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float red = components[0];
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float green = components[1];
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float blue = components[2];
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return {
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0.57666904f * red + 0.18555824f * green + 0.18822865f * blue,
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0.29734498f * red + 0.62736357f * green + 0.07529146f * blue,
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0.02703136f * red + 0.07068885f * green + 0.99133754f * blue,
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components.alpha(),
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};
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}
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// https://drafts.csswg.org/css-color-4/#predefined-a98-rgb
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents xyz65_to_linear_a98_rgb(ColorComponents const& components)
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{
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float x = components[0];
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float y = components[1];
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float z = components[2];
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return {
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+2.0415879038f * x - 0.5650069743f * y - 0.3473784579f * z,
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-0.9692436363f * x + 1.8759675015f * y + 0.0415550574f * z,
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+0.0134442806f * x - 0.1183623922f * y + 1.0151749944f * z,
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components.alpha(),
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};
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}
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// https://drafts.csswg.org/css-color-4/#predefined-prophoto-rgb
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents prophoto_rgb_to_linear_prophoto_rgb(ColorComponents const& components)
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{
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auto to_linear = [](float c) -> float {
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float sign = c < 0.0f ? -1.0f : 1.0f;
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float absolute = abs(c);
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if (absolute <= 16.0f / 512.0f)
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return c / 16.0f;
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return sign * static_cast<float>(pow(absolute, 1.8));
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};
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return { to_linear(components[0]), to_linear(components[1]), to_linear(components[2]), components.alpha() };
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}
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// https://drafts.csswg.org/css-color-4/#predefined-prophoto-rgb
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents linear_prophoto_rgb_to_prophoto_rgb(ColorComponents const& components)
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{
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auto to_gamma = [](float c) -> float {
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float sign = c < 0.0f ? -1.0f : 1.0f;
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float absolute = abs(c);
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if (absolute <= 1.0f / 512.0f)
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return c * 16.0f;
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return sign * static_cast<float>(pow(absolute, 1.0 / 1.8));
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};
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return { to_gamma(components[0]), to_gamma(components[1]), to_gamma(components[2]), components.alpha() };
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}
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// https://drafts.csswg.org/css-color-4/#predefined-prophoto-rgb
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// https://drafts.csswg.org/css-color-4/#color-conversion-code
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ColorComponents linear_prophoto_rgb_to_xyz50(ColorComponents const& components)
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{
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float red = components[0];
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float green = components[1];
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float blue = components[2];
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return {
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0.79776664f * red + 0.13518130f * green + 0.03134773f * blue,
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0.28807483f * red + 0.71183523f * green + 0.00008994f * blue,
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0.00000000f * red + 0.00000000f * green + 0.82510460f * blue,
|
||||
components.alpha(),
|
||||
};
|
||||
}
|
||||
|
||||
// https://drafts.csswg.org/css-color-4/#predefined-prophoto-rgb
|
||||
// https://drafts.csswg.org/css-color-4/#color-conversion-code
|
||||
ColorComponents xyz50_to_linear_prophoto_rgb(ColorComponents const& components)
|
||||
{
|
||||
float x = components[0];
|
||||
float y = components[1];
|
||||
float z = components[2];
|
||||
return {
|
||||
+1.3457989731f * x - 0.2555802200f * y - 0.0511188540f * z,
|
||||
-0.5446224939f * x + 1.5082327413f * y + 0.0205274474f * z,
|
||||
+0.0000000000f * x + 0.0000000000f * y + 1.2119675456f * z,
|
||||
components.alpha(),
|
||||
};
|
||||
}
|
||||
|
||||
// https://drafts.csswg.org/css-color-4/#predefined-rec2020
|
||||
// https://drafts.csswg.org/css-color-4/#color-conversion-code
|
||||
ColorComponents rec2020_to_linear_rec2020(ColorComponents const& components)
|
||||
{
|
||||
auto to_linear = [](float c) -> float {
|
||||
float sign = c < 0.0f ? -1.0f : 1.0f;
|
||||
float absolute = abs(c);
|
||||
|
||||
return sign * static_cast<float>(pow(absolute, 2.4));
|
||||
};
|
||||
|
||||
return { to_linear(components[0]), to_linear(components[1]), to_linear(components[2]), components.alpha() };
|
||||
}
|
||||
|
||||
// https://drafts.csswg.org/css-color-4/#predefined-rec2020
|
||||
// https://drafts.csswg.org/css-color-4/#color-conversion-code
|
||||
ColorComponents linear_rec2020_to_rec2020(ColorComponents const& components)
|
||||
{
|
||||
auto to_gamma = [](float c) -> float {
|
||||
float sign = c < 0.0f ? -1.0f : 1.0f;
|
||||
float absolute = abs(c);
|
||||
|
||||
return sign * static_cast<float>(pow(absolute, 1.0 / 2.4));
|
||||
};
|
||||
|
||||
return { to_gamma(components[0]), to_gamma(components[1]), to_gamma(components[2]), components.alpha() };
|
||||
}
|
||||
|
||||
// https://drafts.csswg.org/css-color-4/#predefined-rec2020
|
||||
// https://drafts.csswg.org/css-color-4/#color-conversion-code
|
||||
ColorComponents linear_rec2020_to_xyz65(ColorComponents const& components)
|
||||
{
|
||||
float red = components[0];
|
||||
float green = components[1];
|
||||
float blue = components[2];
|
||||
return {
|
||||
0.63695805f * red + 0.14461690f * green + 0.16888098f * blue,
|
||||
0.26270021f * red + 0.67799807f * green + 0.05930172f * blue,
|
||||
0.00000000f * red + 0.02807269f * green + 1.06098506f * blue,
|
||||
components.alpha(),
|
||||
};
|
||||
}
|
||||
|
||||
// https://drafts.csswg.org/css-color-4/#predefined-rec2020
|
||||
// https://drafts.csswg.org/css-color-4/#color-conversion-code
|
||||
ColorComponents xyz65_to_linear_rec2020(ColorComponents const& components)
|
||||
{
|
||||
float x = components[0];
|
||||
float y = components[1];
|
||||
float z = components[2];
|
||||
return {
|
||||
+1.7166511880f * x - 0.3556707838f * y - 0.2533662814f * z,
|
||||
-0.6666843518f * x + 1.6164812366f * y + 0.0157685458f * z,
|
||||
+0.0176398574f * x - 0.0427706133f * y + 0.9421031212f * z,
|
||||
components.alpha(),
|
||||
};
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -12,6 +12,8 @@
|
|||
|
||||
namespace Gfx {
|
||||
|
||||
class Color;
|
||||
|
||||
class ColorComponents {
|
||||
public:
|
||||
constexpr ColorComponents() = default;
|
||||
|
|
@ -223,4 +225,46 @@ ColorComponents xyz50_to_linear_srgb(ColorComponents const&);
|
|||
ColorComponents xyz65_to_linear_srgb(ColorComponents const&);
|
||||
ColorComponents lab_to_xyz50(ColorComponents const&);
|
||||
|
||||
ColorComponents color_to_srgb(Color);
|
||||
Color srgb_to_color(ColorComponents const&);
|
||||
|
||||
ColorComponents linear_srgb_to_xyz65(ColorComponents const&);
|
||||
|
||||
ColorComponents xyz65_to_xyz50(ColorComponents const&);
|
||||
ColorComponents xyz50_to_xyz65(ColorComponents const&);
|
||||
|
||||
ColorComponents xyz65_to_oklab(ColorComponents const&);
|
||||
ColorComponents oklab_to_xyz65(ColorComponents const&);
|
||||
|
||||
ColorComponents oklab_to_oklch(ColorComponents const&);
|
||||
ColorComponents oklch_to_oklab(ColorComponents const&);
|
||||
|
||||
ColorComponents xyz50_to_lab(ColorComponents const&);
|
||||
|
||||
ColorComponents lab_to_lch(ColorComponents const&);
|
||||
ColorComponents lch_to_lab(ColorComponents const&);
|
||||
|
||||
ColorComponents srgb_to_hsl(ColorComponents const&);
|
||||
|
||||
ColorComponents srgb_to_hwb(ColorComponents const&);
|
||||
ColorComponents hwb_to_srgb(ColorComponents const&);
|
||||
|
||||
ColorComponents linear_display_p3_to_display_p3(ColorComponents const&);
|
||||
ColorComponents xyz65_to_linear_display_p3(ColorComponents const&);
|
||||
|
||||
ColorComponents a98_rgb_to_linear_a98_rgb(ColorComponents const&);
|
||||
ColorComponents linear_a98_rgb_to_a98_rgb(ColorComponents const&);
|
||||
ColorComponents linear_a98_rgb_to_xyz65(ColorComponents const&);
|
||||
ColorComponents xyz65_to_linear_a98_rgb(ColorComponents const&);
|
||||
|
||||
ColorComponents prophoto_rgb_to_linear_prophoto_rgb(ColorComponents const&);
|
||||
ColorComponents linear_prophoto_rgb_to_prophoto_rgb(ColorComponents const&);
|
||||
ColorComponents linear_prophoto_rgb_to_xyz50(ColorComponents const&);
|
||||
ColorComponents xyz50_to_linear_prophoto_rgb(ColorComponents const&);
|
||||
|
||||
ColorComponents rec2020_to_linear_rec2020(ColorComponents const&);
|
||||
ColorComponents linear_rec2020_to_rec2020(ColorComponents const&);
|
||||
ColorComponents linear_rec2020_to_xyz65(ColorComponents const&);
|
||||
ColorComponents xyz65_to_linear_rec2020(ColorComponents const&);
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue