mirror of
https://github.com/LadybirdBrowser/ladybird.git
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492 lines
12 KiB
C++
492 lines
12 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/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 RGBA32;
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constexpr u32 make_rgb(u8 r, u8 g, u8 b)
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{
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return ((r << 16) | (g << 8) | b);
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}
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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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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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};
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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_rgba(unsigned rgba) { return Color(rgba); }
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static constexpr Color from_cmyk(float c, float m, float y, float k)
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{
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auto r = static_cast<u8>(255.0f * (1.0f - c) * (1.0f - k));
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auto g = static_cast<u8>(255.0f * (1.0f - m) * (1.0f - k));
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auto b = static_cast<u8>(255.0f * (1.0f - y) * (1.0f - k));
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return Color(r, g, b);
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}
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static constexpr Color from_hsl(double h_degrees, double s, double l) { return from_hsla(h_degrees, s, l, 1.0); }
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static constexpr Color from_hsla(double h_degrees, double s, double l, double 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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double h = clamp(h_degrees / 360.0, 0.0, 1.0);
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s = clamp(s, 0.0, 1.0);
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l = clamp(l, 0.0, 1.0);
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a = clamp(a, 0.0, 1.0);
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// HOW TO RETURN hue.to.rgb(m1, m2, h):
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auto hue_to_rgb = [](double m1, double m2, double h) -> double {
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// IF h<0: PUT h+1 IN h
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if (h < 0.0)
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h = h + 1.0;
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// IF h>1: PUT h-1 IN h
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if (h > 1.0)
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h = h - 1.0;
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// IF h*6<1: RETURN m1+(m2-m1)*h*6
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if (h * 6.0 < 1.0)
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return m1 + (m2 - m1) * h * 6.0;
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// IF h*2<1: RETURN m2
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if (h * 2.0 < 1.0)
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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 * 3.0 < 2.0)
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return m1 + (m2 - m1) * (2.0 / 3.0 - h) * 6.0;
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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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double m2;
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if (l <= 0.5)
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m2 = l * (s + 1.0);
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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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double m1 = l * 2.0 - m2;
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// PUT hue.to.rgb(m1, m2, h+1/3) IN r
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double r = hue_to_rgb(m1, m2, h + 1.0 / 3.0);
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// PUT hue.to.rgb(m1, m2, h ) IN g
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double 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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double b = hue_to_rgb(m1, m2, h - 1.0 / 3.0);
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// RETURN (r, g, b)
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u8 r_u8 = clamp(lroundf(r * 255.0), 0, 255);
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u8 g_u8 = clamp(lroundf(g * 255.0), 0, 255);
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u8 b_u8 = clamp(lroundf(b * 255.0), 0, 255);
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u8 a_u8 = clamp(lroundf(a * 255.0), 0, 255);
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return Color(r_u8, g_u8, b_u8, a_u8);
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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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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() || source.alpha() == 255)
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return source;
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if (!source.alpha())
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return *this;
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#ifdef __SSE__
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using AK::SIMD::i32x4;
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const i32x4 color = {
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red(),
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green(),
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blue()
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};
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const i32x4 source_color = {
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source.red(),
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source.green(),
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source.blue()
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};
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const int d = 255 * (alpha() + source.alpha()) - alpha() * source.alpha();
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const i32x4 out = (color * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source_color) / d;
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return Color(out[0], out[1], out[2], d / 255);
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#else
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int d = 255 * (alpha() + source.alpha()) - alpha() * source.alpha();
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u8 r = (red() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.red()) / d;
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u8 g = (green() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.green()) / d;
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u8 b = (blue() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.blue()) / d;
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u8 a = d / 255;
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return Color(r, g, b, a);
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#endif
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}
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Color interpolate(Color const& other, float weight) const noexcept
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{
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u8 r = red() + roundf(static_cast<float>(other.red() - red()) * weight);
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u8 g = green() + roundf(static_cast<float>(other.green() - green()) * weight);
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u8 b = blue() + roundf(static_cast<float>(other.blue() - blue()) * weight);
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u8 a = alpha() + roundf(static_cast<float>(other.alpha() - alpha()) * weight);
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return Color(r, g, b, a);
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}
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constexpr Color multiply(Color const& 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 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 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 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 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 const& 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 RGBA32 value() const { return m_value; }
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constexpr bool operator==(Color const& other) const
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{
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return m_value == other.m_value;
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}
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constexpr bool operator!=(Color const& 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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static Optional<Color> from_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);
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VERIFY(hsv.value >= 0.0 && hsv.value <= 1.0);
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double hue = hsv.hue;
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double saturation = hsv.saturation;
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double value = hsv.value;
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int high = static_cast<int>(hue / 60.0) % 6;
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double f = (hue / 60.0) - high;
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double c1 = value * (1.0 - saturation);
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double c2 = value * (1.0 - saturation * f);
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double c3 = value * (1.0 - saturation * (1.0 - f));
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double r = 0;
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double g = 0;
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double b = 0;
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switch (high) {
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case 0:
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r = value;
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g = c3;
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b = c1;
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break;
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case 1:
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r = c2;
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g = value;
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b = c1;
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break;
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case 2:
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r = c1;
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g = value;
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b = c3;
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break;
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case 3:
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r = c1;
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g = c2;
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b = value;
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break;
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case 4:
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r = c3;
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g = c1;
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b = value;
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break;
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case 5:
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r = value;
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g = c1;
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b = c2;
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break;
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}
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u8 out_r = (u8)(r * 255);
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u8 out_g = (u8)(g * 255);
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u8 out_b = (u8)(b * 255);
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return Color(out_r, out_g, out_b);
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}
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constexpr Color suggested_foreground_color() const
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{
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return luminosity() < 128 ? Color::White : Color::Black;
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}
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private:
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constexpr explicit Color(RGBA32 rgba)
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: m_value(rgba)
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{
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}
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RGBA32 m_value { 0 };
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};
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constexpr Color::Color(NamedColor named)
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{
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if (named == Transparent) {
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m_value = 0;
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return;
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}
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struct {
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u8 r;
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u8 g;
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u8 b;
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} rgb;
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switch (named) {
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case Black:
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rgb = { 0, 0, 0 };
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break;
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case White:
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rgb = { 255, 255, 255 };
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break;
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case Red:
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rgb = { 255, 0, 0 };
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break;
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case Green:
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rgb = { 0, 255, 0 };
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break;
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case Cyan:
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rgb = { 0, 255, 255 };
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break;
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case DarkCyan:
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rgb = { 0, 127, 127 };
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break;
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case MidCyan:
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rgb = { 0, 192, 192 };
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break;
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case Blue:
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rgb = { 0, 0, 255 };
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break;
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case Yellow:
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rgb = { 255, 255, 0 };
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break;
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case Magenta:
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rgb = { 255, 0, 255 };
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break;
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case DarkGray:
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rgb = { 64, 64, 64 };
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break;
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case MidGray:
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rgb = { 127, 127, 127 };
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break;
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case LightGray:
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rgb = { 192, 192, 192 };
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break;
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case MidGreen:
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rgb = { 0, 192, 0 };
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break;
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case MidBlue:
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rgb = { 0, 0, 192 };
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break;
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case MidRed:
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rgb = { 192, 0, 0 };
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break;
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case MidMagenta:
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rgb = { 192, 0, 192 };
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break;
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case DarkGreen:
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rgb = { 0, 128, 0 };
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break;
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case DarkBlue:
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rgb = { 0, 0, 128 };
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break;
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case DarkRed:
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rgb = { 128, 0, 0 };
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break;
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case WarmGray:
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rgb = { 212, 208, 200 };
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break;
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default:
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VERIFY_NOT_REACHED();
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break;
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}
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m_value = 0xff000000 | (rgb.r << 16) | (rgb.g << 8) | rgb.b;
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}
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}
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using Gfx::Color;
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namespace AK {
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template<>
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struct Formatter<Gfx::Color> : public Formatter<StringView> {
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void format(FormatBuilder& builder, Gfx::Color const& value);
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};
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}
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namespace IPC {
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bool encode(Encoder&, Gfx::Color const&);
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bool decode(Decoder&, Gfx::Color&);
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}
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