68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
#pragma once
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#include <mbgl/util/feature.hpp>
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#include <cassert>
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#include <string>
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#include <array>
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#include <optional>
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namespace mbgl {
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// Stores a premultiplied color, with all four channels ranging from 0..1
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class Color {
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public:
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Color() = default;
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Color(float r_, float g_, float b_, float a_)
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: r(r_),
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g(g_),
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b(b_),
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a(a_) {
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assert(r_ >= 0.0f);
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assert(r_ <= 1.0f);
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assert(g_ >= 0.0f);
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assert(g_ <= 1.0f);
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assert(b_ >= 0.0f);
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assert(b_ <= 1.0f);
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assert(a_ >= 0.0f);
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assert(a_ <= 1.0f);
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}
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Color(const float rgba[4])
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: Color(rgba[0], rgba[1], rgba[2], rgba[3]) {}
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float r = 0.0f;
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float g = 0.0f;
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float b = 0.0f;
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float a = 0.0f;
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static Color black() { return {0.0f, 0.0f, 0.0f, 1.0f}; };
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static Color white() { return {1.0f, 1.0f, 1.0f, 1.0f}; };
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static Color red() { return {1.0f, 0.0f, 0.0f, 1.0f}; };
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static Color green() { return {0.0f, 1.0f, 0.0f, 1.0f}; };
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static Color blue() { return {0.0f, 0.0f, 1.0f, 1.0f}; };
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static std::optional<Color> parse(const std::string&);
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std::string stringify() const;
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std::array<double, 4> toArray() const;
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operator std::array<float, 4>() const { return {r, g, b, a}; }
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mbgl::Value toObject() const;
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mbgl::Value serialize() const;
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};
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inline bool operator==(const Color& colorA, const Color& colorB) {
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return colorA.r == colorB.r && colorA.g == colorB.g && colorA.b == colorB.b && colorA.a == colorB.a;
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}
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inline bool operator!=(const Color& colorA, const Color& colorB) {
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return !(colorA == colorB);
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}
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inline Color operator*(const Color& color, float alpha) {
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assert(alpha >= 0.0f);
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assert(alpha <= 1.0f);
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return {color.r * alpha, color.g * alpha, color.b * alpha, color.a * alpha};
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}
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} // namespace mbgl
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