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655 lines
18 KiB
C++
655 lines
18 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Format.h>
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#include <AK/Forward.h>
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#include <AK/Math.h>
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#include <AK/SIMD.h>
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#include <AK/StdLibExtras.h>
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#include <LibIPC/Forward.h>
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#include <math.h>
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namespace Gfx {
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enum class ColorRole;
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typedef u32 ARGB32;
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struct HSV {
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double hue { 0 };
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double saturation { 0 };
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double value { 0 };
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};
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struct YUV {
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float y { 0 };
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float u { 0 };
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float v { 0 };
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};
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struct Oklab {
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float L { 0 };
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float a { 0 };
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float b { 0 };
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};
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class Color {
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public:
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enum NamedColor {
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Transparent,
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Black,
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White,
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Red,
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Green,
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Cyan,
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Blue,
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Yellow,
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Magenta,
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DarkGray,
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MidGray,
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LightGray,
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WarmGray,
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DarkCyan,
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DarkGreen,
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DarkBlue,
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DarkRed,
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MidCyan,
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MidGreen,
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MidRed,
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MidBlue,
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MidMagenta,
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LightBlue,
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};
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constexpr Color() = default;
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constexpr Color(NamedColor);
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constexpr Color(u8 r, u8 g, u8 b)
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: m_value(0xff000000 | (r << 16) | (g << 8) | b)
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{
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}
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constexpr Color(u8 r, u8 g, u8 b, u8 a)
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: m_value((a << 24) | (r << 16) | (g << 8) | b)
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{
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}
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static constexpr Color from_rgb(unsigned rgb) { return Color(rgb | 0xff000000); }
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static constexpr Color from_argb(unsigned argb) { return Color(argb); }
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static constexpr Color from_yuv(YUV const& yuv) { return from_yuv(yuv.y, yuv.u, yuv.v); }
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static constexpr Color from_yuv(float y, float u, float v)
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{
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// https://www.itu.int/rec/R-REC-BT.1700-0-200502-I/en Table 4, Items 8 and 9 arithmetically inverted
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float r = y + v / 0.877f;
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float b = y + u / 0.493f;
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float g = (y - 0.299f * r - 0.114f * b) / 0.587f;
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r = clamp(r, 0.0f, 1.0f);
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g = clamp(g, 0.0f, 1.0f);
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b = clamp(b, 0.0f, 1.0f);
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return { static_cast<u8>(floorf(r * 255.0f)), static_cast<u8>(floorf(g * 255.0f)), static_cast<u8>(floorf(b * 255.0f)) };
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}
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// https://www.itu.int/rec/R-REC-BT.1700-0-200502-I/en Table 4
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constexpr YUV to_yuv() const
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{
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float r = red() / 255.0f;
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float g = green() / 255.0f;
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float b = blue() / 255.0f;
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// Item 8
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float y = 0.299f * r + 0.587f * g + 0.114f * b;
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// Item 9
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float u = 0.493f * (b - y);
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float v = 0.877f * (r - y);
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y = clamp(y, 0.0f, 1.0f);
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u = clamp(u, -1.0f, 1.0f);
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v = clamp(v, -1.0f, 1.0f);
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return { y, u, v };
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}
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static constexpr Color from_hsl(float h_degrees, float s, float l) { return from_hsla(h_degrees, s, l, 1.0); }
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static constexpr Color from_hsla(float h_degrees, float s, float l, float a)
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{
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// Algorithm from https://www.w3.org/TR/css-color-3/#hsl-color
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float h = clamp(h_degrees / 360.0f, 0.0f, 1.0f);
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s = clamp(s, 0.0f, 1.0f);
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l = clamp(l, 0.0f, 1.0f);
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a = clamp(a, 0.0f, 1.0f);
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// HOW TO RETURN hue.to.rgb(m1, m2, h):
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auto hue_to_rgb = [](float m1, float m2, float h) -> float {
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// IF h<0: PUT h+1 IN h
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if (h < 0.0f)
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h = h + 1.0f;
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// IF h>1: PUT h-1 IN h
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if (h > 1.0f)
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h = h - 1.0f;
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// IF h*6<1: RETURN m1+(m2-m1)*h*6
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if (h * 6.0f < 1.0f)
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return m1 + (m2 - m1) * h * 6.0f;
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// IF h*2<1: RETURN m2
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if (h * 2.0f < 1.0f)
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return m2;
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// IF h*3<2: RETURN m1+(m2-m1)*(2/3-h)*6
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if (h * 3.0f < 2.0f)
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return m1 + (m2 - m1) * (2.0f / 3.0f - h) * 6.0f;
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// RETURN m1
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return m1;
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};
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// SELECT:
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// l<=0.5: PUT l*(s+1) IN m2
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float m2;
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if (l <= 0.5f)
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m2 = l * (s + 1.0f);
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// ELSE: PUT l+s-l*s IN m2
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else
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m2 = l + s - l * s;
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// PUT l*2-m2 IN m1
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float m1 = l * 2.0f - m2;
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// PUT hue.to.rgb(m1, m2, h+1/3) IN r
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float r = hue_to_rgb(m1, m2, h + 1.0f / 3.0f);
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// PUT hue.to.rgb(m1, m2, h ) IN g
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float g = hue_to_rgb(m1, m2, h);
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// PUT hue.to.rgb(m1, m2, h-1/3) IN b
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float b = hue_to_rgb(m1, m2, h - 1.0f / 3.0f);
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// RETURN (r, g, b)
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u8 r_u8 = clamp(lroundf(r * 255.0f), 0, 255);
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u8 g_u8 = clamp(lroundf(g * 255.0f), 0, 255);
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u8 b_u8 = clamp(lroundf(b * 255.0f), 0, 255);
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u8 a_u8 = clamp(lroundf(a * 255.0f), 0, 255);
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return Color(r_u8, g_u8, b_u8, a_u8);
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}
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// https://bottosson.github.io/posts/oklab/
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static constexpr Color from_oklab(float L, float a, float b, float alpha = 1.0f)
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{
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auto linear_to_srgb = [](float c) {
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return c >= 0.0031308f ? 1.055f * pow(c, 0.4166666f) - 0.055f : 12.92f * c;
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};
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float l = L + 0.3963377774f * a + 0.2158037573f * b;
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float m = L - 0.1055613458f * a - 0.0638541728f * b;
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float s = L - 0.0894841775f * a - 1.2914855480f * b;
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l = l * l * l;
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m = m * m * m;
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s = s * s * s;
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float red = 4.0767416621f * l - 3.3077115913f * m + 0.2309699292f * s;
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float green = -1.2684380046f * l + 2.6097574011f * m - 0.3413193965f * s;
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float blue = -0.0041960863f * l - 0.7034186147f * m + 1.7076147010f * s;
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red = linear_to_srgb(red) * 255.f;
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green = linear_to_srgb(green) * 255.f;
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blue = linear_to_srgb(blue) * 255.f;
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return Color(
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clamp(lroundf(red), 0, 255),
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clamp(lroundf(green), 0, 255),
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clamp(lroundf(blue), 0, 255),
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clamp(lroundf(alpha * 255.f), 0, 255));
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}
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// https://bottosson.github.io/posts/oklab/
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constexpr Oklab to_oklab()
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{
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auto srgb_to_linear = [](float c) {
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return c >= 0.04045f ? pow((c + 0.055f) / 1.055f, 2.4f) : c / 12.92f;
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};
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float r = srgb_to_linear(red() / 255.f);
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float g = srgb_to_linear(green() / 255.f);
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float b = srgb_to_linear(blue() / 255.f);
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float l = cbrtf(0.4122214708f * r + 0.5363325363f * g + 0.0514459929f * b);
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float m = cbrtf(0.2119034982f * r + 0.6806995451f * g + 0.1073969566f * b);
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float s = cbrtf(0.0883024619f * r + 0.2817188376f * g + 0.6299787005f * b);
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return {
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0.2104542553f * l + 0.7936177850f * m - 0.0040720468f * s,
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1.9779984951f * l - 2.4285922050f * m + 0.4505937099f * s,
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0.0259040371f * l + 0.7827717662f * m - 0.8086757660f * s,
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};
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}
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constexpr u8 red() const { return (m_value >> 16) & 0xff; }
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constexpr u8 green() const { return (m_value >> 8) & 0xff; }
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constexpr u8 blue() const { return m_value & 0xff; }
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constexpr u8 alpha() const { return (m_value >> 24) & 0xff; }
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constexpr void set_alpha(u8 value)
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{
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m_value &= 0x00ffffff;
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m_value |= value << 24;
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}
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constexpr void set_red(u8 value)
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{
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m_value &= 0xff00ffff;
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m_value |= value << 16;
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}
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constexpr void set_green(u8 value)
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{
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m_value &= 0xffff00ff;
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m_value |= value << 8;
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}
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constexpr void set_blue(u8 value)
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{
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m_value &= 0xffffff00;
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m_value |= value;
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}
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constexpr Color with_alpha(u8 alpha) const
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{
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return Color((m_value & 0x00ffffff) | alpha << 24);
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}
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constexpr Color blend(Color source) const
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{
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if (alpha() == 0 || source.alpha() == 255)
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return source;
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if (source.alpha() == 0)
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return *this;
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int const d = 255 * (alpha() + source.alpha()) - alpha() * source.alpha();
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u8 r = (red() * alpha() * (255 - source.alpha()) + source.red() * 255 * source.alpha()) / d;
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u8 g = (green() * alpha() * (255 - source.alpha()) + source.green() * 255 * source.alpha()) / d;
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u8 b = (blue() * alpha() * (255 - source.alpha()) + source.blue() * 255 * source.alpha()) / d;
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u8 a = d / 255;
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return Color(r, g, b, a);
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}
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ALWAYS_INLINE Color mixed_with(Color other, float weight) const
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{
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if (alpha() == other.alpha() || with_alpha(0) == other.with_alpha(0))
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return interpolate(other, weight);
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// Fallback to slower, but more visually pleasing premultiplied alpha mix.
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// This is needed for linear-gradient()s in LibWeb.
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auto mixed_alpha = mix<float>(alpha(), other.alpha(), weight);
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auto premultiplied_mix_channel = [&](float channel, float other_channel, float weight) {
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return round_to<u8>(mix<float>(channel * alpha(), other_channel * other.alpha(), weight) / mixed_alpha);
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};
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return Gfx::Color {
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premultiplied_mix_channel(red(), other.red(), weight),
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premultiplied_mix_channel(green(), other.green(), weight),
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premultiplied_mix_channel(blue(), other.blue(), weight),
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round_to<u8>(mixed_alpha),
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};
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}
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ALWAYS_INLINE Color interpolate(Color other, float weight) const noexcept
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{
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return Gfx::Color {
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round_to<u8>(mix<float>(red(), other.red(), weight)),
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round_to<u8>(mix<float>(green(), other.green(), weight)),
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round_to<u8>(mix<float>(blue(), other.blue(), weight)),
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round_to<u8>(mix<float>(alpha(), other.alpha(), weight)),
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};
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}
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constexpr Color multiply(Color other) const
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{
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return Color(
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red() * other.red() / 255,
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green() * other.green() / 255,
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blue() * other.blue() / 255,
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alpha() * other.alpha() / 255);
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}
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constexpr float distance_squared_to(Color other) const
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{
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int delta_red = other.red() - red();
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int delta_green = other.green() - green();
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int delta_blue = other.blue() - blue();
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int delta_alpha = other.alpha() - alpha();
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auto rgb_distance = (delta_red * delta_red + delta_green * delta_green + delta_blue * delta_blue) / (3.0f * 255 * 255);
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return delta_alpha * delta_alpha / (2.0f * 255 * 255) + rgb_distance * alpha() * other.alpha() / (255 * 255);
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}
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constexpr u8 luminosity() const
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{
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return (red() * 0.2126f + green() * 0.7152f + blue() * 0.0722f);
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}
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constexpr float contrast_ratio(Color other)
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{
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auto l1 = luminosity();
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auto l2 = other.luminosity();
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auto darkest = min(l1, l2) / 255.;
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auto brightest = max(l1, l2) / 255.;
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return (brightest + 0.05) / (darkest + 0.05);
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}
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constexpr Color to_grayscale() const
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{
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auto gray = luminosity();
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return Color(gray, gray, gray, alpha());
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}
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constexpr Color sepia(float amount = 1.0f) const
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{
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auto blend_factor = 1.0f - amount;
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auto r1 = 0.393f + 0.607f * blend_factor;
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auto r2 = 0.769f - 0.769f * blend_factor;
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auto r3 = 0.189f - 0.189f * blend_factor;
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auto g1 = 0.349f - 0.349f * blend_factor;
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auto g2 = 0.686f + 0.314f * blend_factor;
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auto g3 = 0.168f - 0.168f * blend_factor;
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auto b1 = 0.272f - 0.272f * blend_factor;
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auto b2 = 0.534f - 0.534f * blend_factor;
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auto b3 = 0.131f + 0.869f * blend_factor;
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auto r = red();
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auto g = green();
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auto b = blue();
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return Color(
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clamp(lroundf(r * r1 + g * r2 + b * r3), 0, 255),
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clamp(lroundf(r * g1 + g * g2 + b * g3), 0, 255),
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clamp(lroundf(r * b1 + g * b2 + b * b3), 0, 255),
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alpha());
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}
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constexpr Color with_opacity(float opacity) const
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{
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return with_alpha(alpha() * opacity);
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}
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constexpr Color darkened(float amount = 0.5f) const
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{
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return Color(red() * amount, green() * amount, blue() * amount, alpha());
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}
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constexpr Color lightened(float amount = 1.2f) const
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{
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return Color(min(255, (int)((float)red() * amount)), min(255, (int)((float)green() * amount)), min(255, (int)((float)blue() * amount)), alpha());
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}
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Vector<Color> shades(u32 steps, float max = 1.f) const;
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Vector<Color> tints(u32 steps, float max = 1.f) const;
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constexpr Color saturated_to(float saturation) const
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{
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auto hsv = to_hsv();
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auto alpha = this->alpha();
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auto color = Color::from_hsv(hsv.hue, static_cast<double>(saturation), hsv.value);
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color.set_alpha(alpha);
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return color;
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}
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constexpr Color inverted() const
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{
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return Color(~red(), ~green(), ~blue(), alpha());
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}
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constexpr Color xored(Color other) const
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{
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return Color(((other.m_value ^ m_value) & 0x00ffffff) | (m_value & 0xff000000));
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}
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constexpr ARGB32 value() const { return m_value; }
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constexpr bool operator==(Color other) const
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{
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return m_value == other.m_value;
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}
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String to_string() const;
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String to_string_without_alpha() const;
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ByteString to_byte_string() const;
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ByteString to_byte_string_without_alpha() const;
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static Optional<Color> from_string(StringView);
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static Optional<Color> from_named_css_color_string(StringView);
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constexpr HSV to_hsv() const
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{
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HSV hsv;
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double r = static_cast<double>(red()) / 255.0;
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double g = static_cast<double>(green()) / 255.0;
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double b = static_cast<double>(blue()) / 255.0;
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double max = AK::max(AK::max(r, g), b);
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double min = AK::min(AK::min(r, g), b);
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double chroma = max - min;
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if (!chroma)
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hsv.hue = 0.0;
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else if (max == r)
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hsv.hue = (60.0 * ((g - b) / chroma)) + 360.0;
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else if (max == g)
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hsv.hue = (60.0 * ((b - r) / chroma)) + 120.0;
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else
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hsv.hue = (60.0 * ((r - g) / chroma)) + 240.0;
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if (hsv.hue >= 360.0)
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hsv.hue -= 360.0;
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if (!max)
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hsv.saturation = 0;
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else
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hsv.saturation = chroma / max;
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hsv.value = max;
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VERIFY(hsv.hue >= 0.0 && hsv.hue < 360.0);
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VERIFY(hsv.saturation >= 0.0 && hsv.saturation <= 1.0);
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VERIFY(hsv.value >= 0.0 && hsv.value <= 1.0);
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return hsv;
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}
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static constexpr Color from_hsv(double hue, double saturation, double value)
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{
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return from_hsv({ hue, saturation, value });
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}
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static constexpr Color from_hsv(HSV const& hsv)
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{
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VERIFY(hsv.hue >= 0.0 && hsv.hue < 360.0);
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VERIFY(hsv.saturation >= 0.0 && hsv.saturation <= 1.0);
|
|
VERIFY(hsv.value >= 0.0 && hsv.value <= 1.0);
|
|
|
|
double hue = hsv.hue;
|
|
double saturation = hsv.saturation;
|
|
double value = hsv.value;
|
|
|
|
int high = static_cast<int>(hue / 60.0) % 6;
|
|
double f = (hue / 60.0) - high;
|
|
double c1 = value * (1.0 - saturation);
|
|
double c2 = value * (1.0 - saturation * f);
|
|
double c3 = value * (1.0 - saturation * (1.0 - f));
|
|
|
|
double r = 0;
|
|
double g = 0;
|
|
double b = 0;
|
|
|
|
switch (high) {
|
|
case 0:
|
|
r = value;
|
|
g = c3;
|
|
b = c1;
|
|
break;
|
|
case 1:
|
|
r = c2;
|
|
g = value;
|
|
b = c1;
|
|
break;
|
|
case 2:
|
|
r = c1;
|
|
g = value;
|
|
b = c3;
|
|
break;
|
|
case 3:
|
|
r = c1;
|
|
g = c2;
|
|
b = value;
|
|
break;
|
|
case 4:
|
|
r = c3;
|
|
g = c1;
|
|
b = value;
|
|
break;
|
|
case 5:
|
|
r = value;
|
|
g = c1;
|
|
b = c2;
|
|
break;
|
|
}
|
|
|
|
u8 out_r = (u8)(r * 255);
|
|
u8 out_g = (u8)(g * 255);
|
|
u8 out_b = (u8)(b * 255);
|
|
return Color(out_r, out_g, out_b);
|
|
}
|
|
|
|
constexpr Color suggested_foreground_color() const
|
|
{
|
|
return luminosity() < 128 ? Color::White : Color::Black;
|
|
}
|
|
|
|
private:
|
|
constexpr explicit Color(ARGB32 argb)
|
|
: m_value(argb)
|
|
{
|
|
}
|
|
|
|
ARGB32 m_value { 0 };
|
|
};
|
|
|
|
constexpr Color::Color(NamedColor named)
|
|
{
|
|
if (named == Transparent) {
|
|
m_value = 0;
|
|
return;
|
|
}
|
|
|
|
struct {
|
|
u8 r;
|
|
u8 g;
|
|
u8 b;
|
|
} rgb;
|
|
|
|
switch (named) {
|
|
case Black:
|
|
rgb = { 0, 0, 0 };
|
|
break;
|
|
case White:
|
|
rgb = { 255, 255, 255 };
|
|
break;
|
|
case Red:
|
|
rgb = { 255, 0, 0 };
|
|
break;
|
|
case Green:
|
|
rgb = { 0, 255, 0 };
|
|
break;
|
|
case Cyan:
|
|
rgb = { 0, 255, 255 };
|
|
break;
|
|
case DarkCyan:
|
|
rgb = { 0, 127, 127 };
|
|
break;
|
|
case MidCyan:
|
|
rgb = { 0, 192, 192 };
|
|
break;
|
|
case Blue:
|
|
rgb = { 0, 0, 255 };
|
|
break;
|
|
case Yellow:
|
|
rgb = { 255, 255, 0 };
|
|
break;
|
|
case Magenta:
|
|
rgb = { 255, 0, 255 };
|
|
break;
|
|
case DarkGray:
|
|
rgb = { 64, 64, 64 };
|
|
break;
|
|
case MidGray:
|
|
rgb = { 127, 127, 127 };
|
|
break;
|
|
case LightGray:
|
|
rgb = { 192, 192, 192 };
|
|
break;
|
|
case MidGreen:
|
|
rgb = { 0, 192, 0 };
|
|
break;
|
|
case MidBlue:
|
|
rgb = { 0, 0, 192 };
|
|
break;
|
|
case MidRed:
|
|
rgb = { 192, 0, 0 };
|
|
break;
|
|
case MidMagenta:
|
|
rgb = { 192, 0, 192 };
|
|
break;
|
|
case DarkGreen:
|
|
rgb = { 0, 128, 0 };
|
|
break;
|
|
case DarkBlue:
|
|
rgb = { 0, 0, 128 };
|
|
break;
|
|
case DarkRed:
|
|
rgb = { 128, 0, 0 };
|
|
break;
|
|
case WarmGray:
|
|
rgb = { 212, 208, 200 };
|
|
break;
|
|
case LightBlue:
|
|
rgb = { 173, 216, 230 };
|
|
break;
|
|
default:
|
|
VERIFY_NOT_REACHED();
|
|
break;
|
|
}
|
|
|
|
m_value = 0xff000000 | (rgb.r << 16) | (rgb.g << 8) | rgb.b;
|
|
}
|
|
|
|
}
|
|
|
|
using Gfx::Color;
|
|
|
|
namespace AK {
|
|
|
|
template<>
|
|
struct Formatter<Gfx::Color> : public Formatter<StringView> {
|
|
ErrorOr<void> format(FormatBuilder&, Gfx::Color);
|
|
};
|
|
|
|
template<>
|
|
struct Formatter<Gfx::YUV> : public Formatter<FormatString> {
|
|
ErrorOr<void> format(FormatBuilder&, Gfx::YUV);
|
|
};
|
|
|
|
template<>
|
|
struct Formatter<Gfx::HSV> : public Formatter<FormatString> {
|
|
ErrorOr<void> format(FormatBuilder&, Gfx::HSV);
|
|
};
|
|
|
|
template<>
|
|
struct Formatter<Gfx::Oklab> : public Formatter<FormatString> {
|
|
ErrorOr<void> format(FormatBuilder&, Gfx::Oklab);
|
|
};
|
|
|
|
}
|
|
|
|
namespace IPC {
|
|
|
|
template<>
|
|
ErrorOr<void> encode(Encoder&, Gfx::Color const&);
|
|
|
|
template<>
|
|
ErrorOr<Gfx::Color> decode(Decoder&);
|
|
|
|
}
|