color.hpp

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#pragma once
 
#include <cinttypes>
#include <cmath>
 
namespace ui {
 
typedef uint16_t color_t;
 
constexpr float clampColor(const float color) {
    return (0.f > color) ? 0.f : ((1.f < color) ? 1.f : color);
}
 
constexpr color_t color(const float red, const float green, const float blue) {
    return (((uint8_t)(clampColor(red) * 0xff) & 0xF8) << 8) | (((uint8_t)(clampColor(green) * 0xff) & 0xFC) << 3) | ((uint8_t)(clampColor(blue) * 0xff) >> 3);
}
 
constexpr color_t rgb(const uint8_t red, const uint8_t green, const uint8_t blue) {
    return ((red & 0xF8) << 8) | ((green & 0xFC) << 3) | (blue >> 3);
}
 
color_t hsv(const int hue, const float saturation, const float value);
 
void hsvComponents(color_t color, int &hue, float &saturation, float &value);
 
void colorComponents(color_t color, float &red, float &green, float &blue);
 
color_t blend(color_t color1, color_t color2, float ratio = 0.5f);
 
enum {
    COLOR_WHITE = 0xffff,
    COLOR_BLACK = 0x0000,
 
    // Mid-range colors
 
    COLOR_GRAY = 0x7bef,
    COLOR_RED = 0xe000,
    COLOR_ORANGE = 0xfbe0,
    COLOR_YELLOW = 0xffe0,
    COLOR_GREEN = 0x07e0,
    COLOR_CYAN = 0x07ff,
    COLOR_BLUE = 0x001f,
    COLOR_PURPLE = 0x381f,
    COLOR_MAGENTA = 0xf81f,
 
    // Light colors
 
    COLOR_LIGHT_GRAY = 0xd69a,
    COLOR_LIGHT_RED = 0xe534,
    COLOR_LIGHT_ORANGE = 0xfe11,
    COLOR_LIGHT_YELLOW = 0xfff7,
    COLOR_LIGHT_GREEN = 0xa7f4,
    COLOR_LIGHT_CYAN = 0xa7ff,
    COLOR_LIGHT_BLUE = 0x853f,
    COLOR_PINK = 0xfd3f,
};
 
} // namespace ui