87 lines
3.4 KiB
C++
87 lines
3.4 KiB
C++
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#pragma once
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#include "base/math.hpp"
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#include <cstdint>
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#include <sstream>
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#include <string>
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namespace dp
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{
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struct Color
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{
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constexpr Color() : Color(0, 0, 0, kMaxChannelValue) {}
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constexpr explicit Color(uint32_t rgba) : m_rgba(rgba) {}
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constexpr Color(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha)
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: Color(red << 24 | green << 16 | blue << 8 | alpha)
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{}
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constexpr Color(uint8_t red, uint8_t green, uint8_t blue) : Color(red, green, blue, 255) {}
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constexpr Color(uint32_t rgb, uint8_t alpha)
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: Color(ExtractByte(rgb, 2), ExtractByte(rgb, 1), ExtractByte(rgb, 0), alpha)
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{}
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constexpr uint8_t GetRed() const { return ExtractByte(m_rgba, 3); }
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constexpr uint8_t GetGreen() const { return ExtractByte(m_rgba, 2); }
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constexpr uint8_t GetBlue() const { return ExtractByte(m_rgba, 1); }
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constexpr uint8_t GetAlpha() const { return ExtractByte(m_rgba, 0); }
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constexpr uint32_t GetRGBA() const { return m_rgba; }
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constexpr uint32_t GetARGB() const
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{
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return (static_cast<uint32_t>(GetAlpha()) << 24) | (static_cast<uint32_t>(GetRed()) << 16) |
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(static_cast<uint32_t>(GetGreen()) << 8) | static_cast<uint32_t>(GetBlue());
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}
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constexpr float GetRedF() const { return ChannelToFloat(GetRed()); }
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constexpr float GetGreenF() const { return ChannelToFloat(GetGreen()); }
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constexpr float GetBlueF() const { return ChannelToFloat(GetBlue()); }
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constexpr float GetAlphaF() const { return ChannelToFloat(GetAlpha()); }
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constexpr bool operator==(Color const & other) const { return m_rgba == other.m_rgba; }
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constexpr bool operator!=(Color const & other) const { return m_rgba != other.m_rgba; }
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constexpr bool operator<(Color const & other) const { return m_rgba < other.m_rgba; }
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constexpr Color operator*(float s) const
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{
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return {static_cast<uint8_t>(math::Clamp(GetRedF() * s, 0.0f, 1.0f) * 255.0f),
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static_cast<uint8_t>(math::Clamp(GetGreenF() * s, 0.0f, 1.0f) * 255.0f),
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static_cast<uint8_t>(math::Clamp(GetBlueF() * s, 0.0f, 1.0f) * 255.0f), GetAlpha()};
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}
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constexpr static Color Black() { return {0, 0, 0, 255}; }
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constexpr static Color White() { return {255, 255, 255, 255}; }
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constexpr static Color Red() { return {255, 0, 0, 255}; }
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constexpr static Color Blue() { return {0, 0, 255, 255}; }
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constexpr static Color Green() { return {0, 255, 0, 255}; }
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constexpr static Color Yellow() { return {255, 255, 0, 255}; }
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constexpr static Color Transparent() { return {0, 0, 0, 0}; }
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constexpr static Color FromARGB(uint32_t argb)
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{
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return {ExtractByte(argb, 2), ExtractByte(argb, 1), ExtractByte(argb, 0), ExtractByte(argb, 3)};
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}
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constexpr static Color FromRGBA(uint32_t rgba)
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{
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return {ExtractByte(rgba, 3), ExtractByte(rgba, 2), ExtractByte(rgba, 1), ExtractByte(rgba, 0)};
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}
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private:
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constexpr static uint8_t ExtractByte(uint32_t number, uint8_t byteIdx) { return (number >> (8 * byteIdx)) & 0xFF; }
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constexpr static float ChannelToFloat(uint8_t channelValue)
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{
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return static_cast<float>(channelValue) / kMaxChannelValue;
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}
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constexpr static uint8_t kMaxChannelValue = 255;
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uint32_t m_rgba;
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};
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inline std::string DebugPrint(Color const & c)
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{
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std::ostringstream out;
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out << "[R = " << static_cast<uint32_t>(c.GetRed()) << ", G = " << static_cast<uint32_t>(c.GetGreen())
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<< ", B = " << static_cast<uint32_t>(c.GetBlue()) << ", A = " << static_cast<uint32_t>(c.GetAlpha()) << "]";
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return out.str();
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}
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} // namespace dp
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