ladybird/Libraries/LibGfx/Color.h

186 lines
4.8 KiB
C
Raw Normal View History

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
2018-10-10 14:49:36 +00:00
#pragma once
#include <AK/Optional.h>
#include <AK/String.h>
2018-10-10 14:49:36 +00:00
#include <AK/Types.h>
namespace Gfx {
enum class ColorRole;
typedef u32 RGBA32;
inline constexpr u32 make_rgb(u8 r, u8 g, u8 b)
{
return ((r << 16) | (g << 8) | b);
}
2018-10-10 14:49:36 +00:00
class Color {
public:
enum NamedColor {
Black,
White,
Red,
Green,
2019-05-05 22:59:33 +00:00
Cyan,
Blue,
2019-01-12 03:02:36 +00:00
Yellow,
Magenta,
2018-10-12 21:02:23 +00:00
DarkGray,
MidGray,
LightGray,
WarmGray,
DarkCyan,
DarkGreen,
DarkBlue,
DarkRed,
MidCyan,
MidGreen,
MidRed,
MidBlue,
MidMagenta,
};
Color() {}
Color(NamedColor);
Color(u8 r, u8 g, u8 b)
: m_value(0xff000000 | (r << 16) | (g << 8) | b)
{
}
Color(u8 r, u8 g, u8 b, u8 a)
: m_value((a << 24) | (r << 16) | (g << 8) | b)
{
}
static Color from_rgb(unsigned rgb) { return Color(rgb | 0xff000000); }
static Color from_rgba(unsigned rgba) { return Color(rgba); }
2018-10-10 14:49:36 +00:00
u8 red() const { return (m_value >> 16) & 0xff; }
u8 green() const { return (m_value >> 8) & 0xff; }
u8 blue() const { return m_value & 0xff; }
u8 alpha() const { return (m_value >> 24) & 0xff; }
void set_alpha(u8 value)
{
m_value &= 0x00ffffff;
m_value |= value << 24;
}
void set_red(u8 value)
{
m_value &= 0xff00ffff;
m_value |= value << 16;
}
void set_green(u8 value)
{
m_value &= 0xffff00ff;
m_value |= value << 8;
}
void set_blue(u8 value)
{
m_value &= 0xffffff00;
m_value |= value;
}
Color with_alpha(u8 alpha)
{
return Color((m_value & 0x00ffffff) | alpha << 24);
}
Color blend(Color source) const
{
if (!alpha() || source.alpha() == 255)
return source;
if (!source.alpha())
return *this;
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);
}
Color to_grayscale() const
{
int gray = (red() + green() + blue()) / 3;
return Color(gray, gray, gray, alpha());
}
Color darkened(float amount = 0.5f) const
{
return Color(red() * amount, green() * amount, blue() * amount, alpha());
}
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());
}
Color inverted() const
{
return Color(~red(), ~green(), ~blue());
}
RGBA32 value() const { return m_value; }
2018-10-10 14:49:36 +00:00
2019-06-14 17:10:43 +00:00
bool operator==(const Color& other) const
{
return m_value == other.m_value;
}
bool operator!=(const Color& other) const
{
return m_value != other.m_value;
}
String to_string() const;
static Optional<Color> from_string(const StringView&);
2018-10-10 14:49:36 +00:00
private:
explicit Color(RGBA32 rgba)
: m_value(rgba)
{
}
RGBA32 m_value { 0 };
2018-10-10 14:49:36 +00:00
};
inline const LogStream& operator<<(const LogStream& stream, Color value)
{
return stream << value.to_string();
}
}
using Gfx::Color;