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309 lines
8 KiB
C++
309 lines
8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/StdLibExtras.h>
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#include <LibIPC/Forward.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() { }
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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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u8 red() const { return (m_value >> 16) & 0xff; }
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u8 green() const { return (m_value >> 8) & 0xff; }
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u8 blue() const { return m_value & 0xff; }
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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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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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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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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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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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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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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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}
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Color to_grayscale() const
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{
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int gray = (red() + green() + blue()) / 3;
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return Color(gray, gray, gray, alpha());
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}
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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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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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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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Color xored(const 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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RGBA32 value() const { return m_value; }
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bool operator==(const 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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bool operator!=(const 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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static Optional<Color> from_string(const StringView&);
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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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ASSERT(hsv.hue >= 0.0 && hsv.hue < 360.0);
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ASSERT(hsv.saturation >= 0.0 && hsv.saturation <= 1.0);
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ASSERT(hsv.value >= 0.0 && hsv.value <= 1.0);
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return hsv;
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}
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static 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 Color from_hsv(const HSV& hsv)
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{
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ASSERT(hsv.hue >= 0.0 && hsv.hue < 360.0);
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ASSERT(hsv.saturation >= 0.0 && hsv.saturation <= 1.0);
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ASSERT(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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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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const LogStream& operator<<(const LogStream&, Color);
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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(TypeErasedFormatParams& params, FormatBuilder& builder, const Gfx::Color& value);
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};
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}
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namespace IPC {
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bool encode(Encoder&, const Gfx::Color&);
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bool decode(Decoder&, Gfx::Color&);
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}
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