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#pragma once
#include <algorithm>
#include <cstdint>
#include <iomanip>
#include <sstream>
#include <string>
namespace OpenVic {
// Represents a 24-bit RGB integer OR a 32-bit ARGB integer
using colour_t = uint32_t;
/* When colour_t is used as an identifier, NULL_COLOUR is disallowed
* and should be reserved as an error value.
* When colour_t is used in a purely graphical context, NULL_COLOUR
* should be allowed.
*/
static constexpr colour_t NULL_COLOUR = 0, FULL_COLOUR = 0xFF, MAX_COLOUR_RGB = 0xFFFFFF;
constexpr colour_t float_to_colour_byte(float f, float min = 0.0f, float max = 1.0f) {
return static_cast<colour_t>(std::clamp(min + f * (max - min), min, max) * 255.0f);
}
constexpr colour_t fraction_to_colour_byte(int n, int d, float min = 0.0f, float max = 1.0f) {
return float_to_colour_byte(static_cast<float>(n) / static_cast<float>(d), min, max);
}
constexpr colour_t float_to_alpha_value(float a) {
return float_to_colour_byte(a) << 24;
}
constexpr float colour_byte_to_float(colour_t colour) {
return std::clamp(static_cast<float>(colour) / 255.0f, 0.0f, 1.0f);
}
inline std::string colour_to_hex_string(colour_t colour) {
std::ostringstream stream;
stream << std::hex << std::setfill('0') << std::setw(6) << colour;
return stream.str();
}
}
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