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ladybird/Userland/Libraries/LibGfx/Color.h
MacDue 6ceb185865 LibGfx: Add ALWAYS_INLINE to Color::mixed_with()/interpolate() 
I can see small speedup of about 6-7% with this for some gradient
painting, though Tim has been able to see an ~30% speedup in some
resizing cases so this seems like a worthwhile change.

Co-authored-by: Tim Ledbetter <timledbetter@gmail.com>
2023-02-18 17:10:04 +01:00

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Format.h>
#include <AK/Forward.h>
#include <AK/Math.h>
#include <AK/SIMD.h>
#include <AK/StdLibExtras.h>
#include <LibIPC/Forward.h>
#include <math.h>
namespace Gfx {
enum class ColorRole;
typedef u32 ARGB32;
struct HSV {
double hue { 0 };
double saturation { 0 };
double value { 0 };
};
struct YUV {
float y { 0 };
float u { 0 };
float v { 0 };
};
class Color {
public:
enum NamedColor {
Transparent,
Black,
White,
Red,
Green,
Cyan,
Blue,
Yellow,
Magenta,
DarkGray,
MidGray,
LightGray,
WarmGray,
DarkCyan,
DarkGreen,
DarkBlue,
DarkRed,
MidCyan,
MidGreen,
MidRed,
MidBlue,
MidMagenta,
LightBlue,
};
constexpr Color() = default;
constexpr Color(NamedColor);
constexpr Color(u8 r, u8 g, u8 b)
: m_value(0xff000000 | (r << 16) | (g << 8) | b)
{
}
constexpr Color(u8 r, u8 g, u8 b, u8 a)
: m_value((a << 24) | (r << 16) | (g << 8) | b)
{
}
static constexpr Color from_rgb(unsigned rgb) { return Color(rgb | 0xff000000); }
static constexpr Color from_argb(unsigned argb) { return Color(argb); }
static constexpr Color from_cmyk(float c, float m, float y, float k)
{
auto r = static_cast<u8>(255.0f * (1.0f - c) * (1.0f - k));
auto g = static_cast<u8>(255.0f * (1.0f - m) * (1.0f - k));
auto b = static_cast<u8>(255.0f * (1.0f - y) * (1.0f - k));
return Color(r, g, b);
}
static constexpr Color from_yuv(YUV const& yuv) { return from_yuv(yuv.y, yuv.u, yuv.v); }
static constexpr Color from_yuv(float y, float u, float v)
{
// https://www.itu.int/rec/R-REC-BT.1700-0-200502-I/en Table 4, Items 8 and 9 arithmetically inverted
float r = y + v / 0.877f;
float b = y + u / 0.493f;
float g = (y - 0.299f * r - 0.114f * b) / 0.587f;
r = clamp(r, 0.0f, 1.0f);
g = clamp(g, 0.0f, 1.0f);
b = clamp(b, 0.0f, 1.0f);
return { static_cast<u8>(floorf(r * 255.0f)), static_cast<u8>(floorf(g * 255.0f)), static_cast<u8>(floorf(b * 255.0f)) };
}
// https://www.itu.int/rec/R-REC-BT.1700-0-200502-I/en Table 4
constexpr YUV to_yuv() const
{
float r = red() / 255.0f;
float g = green() / 255.0f;
float b = blue() / 255.0f;
// Item 8
float y = 0.299f * r + 0.587f * g + 0.114f * b;
// Item 9
float u = 0.493f * (b - y);
float v = 0.877f * (r - y);
y = clamp(y, 0.0f, 1.0f);
u = clamp(u, -1.0f, 1.0f);
v = clamp(v, -1.0f, 1.0f);
return { y, u, v };
}
static constexpr Color from_hsl(float h_degrees, float s, float l) { return from_hsla(h_degrees, s, l, 1.0); }
static constexpr Color from_hsla(float h_degrees, float s, float l, float a)
{
// Algorithm from https://www.w3.org/TR/css-color-3/#hsl-color
float h = clamp(h_degrees / 360.0f, 0.0f, 1.0f);
s = clamp(s, 0.0f, 1.0f);
l = clamp(l, 0.0f, 1.0f);
a = clamp(a, 0.0f, 1.0f);
// HOW TO RETURN hue.to.rgb(m1, m2, h):
auto hue_to_rgb = [](float m1, float m2, float h) -> float {
// IF h<0: PUT h+1 IN h
if (h < 0.0f)
h = h + 1.0f;
// IF h>1: PUT h-1 IN h
if (h > 1.0f)
h = h - 1.0f;
// IF h*6<1: RETURN m1+(m2-m1)*h*6
if (h * 6.0f < 1.0f)
return m1 + (m2 - m1) * h * 6.0f;
// IF h*2<1: RETURN m2
if (h * 2.0f < 1.0f)
return m2;
// IF h*3<2: RETURN m1+(m2-m1)*(2/3-h)*6
if (h * 3.0f < 2.0f)
return m1 + (m2 - m1) * (2.0f / 3.0f - h) * 6.0f;
// RETURN m1
return m1;
};
// SELECT:
// l<=0.5: PUT l*(s+1) IN m2
float m2;
if (l <= 0.5f)
m2 = l * (s + 1.0f);
// ELSE: PUT l+s-l*s IN m2
else
m2 = l + s - l * s;
// PUT l*2-m2 IN m1
float m1 = l * 2.0f - m2;
// PUT hue.to.rgb(m1, m2, h+1/3) IN r
float r = hue_to_rgb(m1, m2, h + 1.0f / 3.0f);
// PUT hue.to.rgb(m1, m2, h ) IN g
float g = hue_to_rgb(m1, m2, h);
// PUT hue.to.rgb(m1, m2, h-1/3) IN b
float b = hue_to_rgb(m1, m2, h - 1.0f / 3.0f);
// RETURN (r, g, b)
u8 r_u8 = clamp(lroundf(r * 255.0f), 0, 255);
u8 g_u8 = clamp(lroundf(g * 255.0f), 0, 255);
u8 b_u8 = clamp(lroundf(b * 255.0f), 0, 255);
u8 a_u8 = clamp(lroundf(a * 255.0f), 0, 255);
return Color(r_u8, g_u8, b_u8, a_u8);
}
constexpr u8 red() const { return (m_value >> 16) & 0xff; }
constexpr u8 green() const { return (m_value >> 8) & 0xff; }
constexpr u8 blue() const { return m_value & 0xff; }
constexpr u8 alpha() const { return (m_value >> 24) & 0xff; }
constexpr void set_alpha(u8 value)
{
m_value &= 0x00ffffff;
m_value |= value << 24;
}
constexpr void set_red(u8 value)
{
m_value &= 0xff00ffff;
m_value |= value << 16;
}
constexpr void set_green(u8 value)
{
m_value &= 0xffff00ff;
m_value |= value << 8;
}
constexpr void set_blue(u8 value)
{
m_value &= 0xffffff00;
m_value |= value;
}
constexpr Color with_alpha(u8 alpha) const
{
return Color((m_value & 0x00ffffff) | alpha << 24);
}
constexpr Color blend(Color source) const
{
if (!alpha() || source.alpha() == 255)
return source;
if (!source.alpha())
return *this;
#ifdef __SSE__
using AK::SIMD::i32x4;
const i32x4 color = {
red(),
green(),
blue()
};
const i32x4 source_color = {
source.red(),
source.green(),
source.blue()
};
int const d = 255 * (alpha() + source.alpha()) - alpha() * source.alpha();
const i32x4 out = (color * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source_color) / d;
return Color(out[0], out[1], out[2], d / 255);
#else
int d = 255 * (alpha() + source.alpha()) - alpha() * source.alpha();
u8 r = (red() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.red()) / d;
u8 g = (green() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.green()) / d;
u8 b = (blue() * alpha() * (255 - source.alpha()) + 255 * source.alpha() * source.blue()) / d;
u8 a = d / 255;
return Color(r, g, b, a);
#endif
}
ALWAYS_INLINE Color mixed_with(Color other, float weight) const
{
if (alpha() == other.alpha() || with_alpha(0) == other.with_alpha(0))
return interpolate(other, weight);
// Fallback to slower, but more visually pleasing premultiplied alpha mix.
// This is needed for linear-gradient()s in LibWeb.
auto mixed_alpha = mix<float>(alpha(), other.alpha(), weight);
auto premultiplied_mix_channel = [&](float channel, float other_channel, float weight) {
return round_to<u8>(mix<float>(channel * alpha(), other_channel * other.alpha(), weight) / mixed_alpha);
};
return Gfx::Color {
premultiplied_mix_channel(red(), other.red(), weight),
premultiplied_mix_channel(green(), other.green(), weight),
premultiplied_mix_channel(blue(), other.blue(), weight),
round_to<u8>(mixed_alpha),
};
}
ALWAYS_INLINE Color interpolate(Color other, float weight) const noexcept
{
return Gfx::Color {
round_to<u8>(mix<float>(red(), other.red(), weight)),
round_to<u8>(mix<float>(green(), other.green(), weight)),
round_to<u8>(mix<float>(blue(), other.blue(), weight)),
round_to<u8>(mix<float>(alpha(), other.alpha(), weight)),
};
}
constexpr Color multiply(Color other) const
{
return Color(
red() * other.red() / 255,
green() * other.green() / 255,
blue() * other.blue() / 255,
alpha() * other.alpha() / 255);
}
constexpr float distance_squared_to(Color other) const
{
int delta_red = other.red() - red();
int delta_green = other.green() - green();
int delta_blue = other.blue() - blue();
int delta_alpha = other.alpha() - alpha();
auto rgb_distance = (delta_red * delta_red + delta_green * delta_green + delta_blue * delta_blue) / (3.0f * 255 * 255);
return delta_alpha * delta_alpha / (2.0f * 255 * 255) + rgb_distance * alpha() * other.alpha() / (255 * 255);
}
constexpr u8 luminosity() const
{
return (red() * 0.2126f + green() * 0.7152f + blue() * 0.0722f);
}
constexpr float contrast_ratio(Color other)
{
auto l1 = luminosity();
auto l2 = other.luminosity();
auto darkest = min(l1, l2) / 255.;
auto brightest = max(l1, l2) / 255.;
return (brightest + 0.05) / (darkest + 0.05);
}
constexpr Color to_grayscale() const
{
auto gray = luminosity();
return Color(gray, gray, gray, alpha());
}
constexpr Color sepia(float amount = 1.0f) const
{
auto blend_factor = 1.0f - amount;
auto r1 = 0.393f + 0.607f * blend_factor;
auto r2 = 0.769f - 0.769f * blend_factor;
auto r3 = 0.189f - 0.189f * blend_factor;
auto g1 = 0.349f - 0.349f * blend_factor;
auto g2 = 0.686f + 0.314f * blend_factor;
auto g3 = 0.168f - 0.168f * blend_factor;
auto b1 = 0.272f - 0.272f * blend_factor;
auto b2 = 0.534f - 0.534f * blend_factor;
auto b3 = 0.131f + 0.869f * blend_factor;
auto r = red();
auto g = green();
auto b = blue();
return Color(
clamp(lroundf(r * r1 + g * r2 + b * r3), 0, 255),
clamp(lroundf(r * g1 + g * g2 + b * g3), 0, 255),
clamp(lroundf(r * b1 + g * b2 + b * b3), 0, 255),
alpha());
}
constexpr Color darkened(float amount = 0.5f) const
{
return Color(red() * amount, green() * amount, blue() * amount, alpha());
}
constexpr Color lightened(float amount = 1.2f) const
{
return Color(min(255, (int)((float)red() * amount)), min(255, (int)((float)green() * amount)), min(255, (int)((float)blue() * amount)), alpha());
}
Vector<Color> shades(u32 steps, float max = 1.f) const;
Vector<Color> tints(u32 steps, float max = 1.f) const;
constexpr Color saturated_to(float saturation) const
{
auto hsv = to_hsv();
auto alpha = this->alpha();
auto color = Color::from_hsv(hsv.hue, static_cast<double>(saturation), hsv.value);
color.set_alpha(alpha);
return color;
}
constexpr Color inverted() const
{
return Color(~red(), ~green(), ~blue(), alpha());
}
constexpr Color xored(Color other) const
{
return Color(((other.m_value ^ m_value) & 0x00ffffff) | (m_value & 0xff000000));
}
constexpr ARGB32 value() const { return m_value; }
constexpr bool operator==(Color other) const
{
return m_value == other.m_value;
}
DeprecatedString to_deprecated_string() const;
DeprecatedString to_deprecated_string_without_alpha() const;
static Optional<Color> from_string(StringView);
constexpr HSV to_hsv() const
{
HSV hsv;
double r = static_cast<double>(red()) / 255.0;
double g = static_cast<double>(green()) / 255.0;
double b = static_cast<double>(blue()) / 255.0;
double max = AK::max(AK::max(r, g), b);
double min = AK::min(AK::min(r, g), b);
double chroma = max - min;
if (!chroma)
hsv.hue = 0.0;
else if (max == r)
hsv.hue = (60.0 * ((g - b) / chroma)) + 360.0;
else if (max == g)
hsv.hue = (60.0 * ((b - r) / chroma)) + 120.0;
else
hsv.hue = (60.0 * ((r - g) / chroma)) + 240.0;
if (hsv.hue >= 360.0)
hsv.hue -= 360.0;
if (!max)
hsv.saturation = 0;
else
hsv.saturation = chroma / max;
hsv.value = max;
VERIFY(hsv.hue >= 0.0 && hsv.hue < 360.0);
VERIFY(hsv.saturation >= 0.0 && hsv.saturation <= 1.0);
VERIFY(hsv.value >= 0.0 && hsv.value <= 1.0);
return hsv;
}
static constexpr Color from_hsv(double hue, double saturation, double value)
{
return from_hsv({ hue, saturation, value });
}
static constexpr Color from_hsv(HSV const& hsv)
{
VERIFY(hsv.hue >= 0.0 && hsv.hue < 360.0);
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);
};
}
namespace IPC {
template<>
ErrorOr<void> encode(Encoder&, Gfx::Color const&);
template<>
ErrorOr<Gfx::Color> decode(Decoder&);
}
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