BLI_color.hh

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/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
 
#pragma once
 
#include <iostream>
 
#include "BLI_math_color.h"
 
namespace blender {
 
struct Color4f {
  float r, g, b, a;
 
  Color4f() = default;
 
  Color4f(const float *rgba) : r(rgba[0]), g(rgba[1]), b(rgba[2]), a(rgba[3])
  {
  }
 
  Color4f(float r, float g, float b, float a) : r(r), g(g), b(b), a(a)
  {
  }
 
  operator float *()
  {
    return &r;
  }
 
  operator const float *() const
  {
    return &r;
  }
 
  friend std::ostream &operator<<(std::ostream &stream, Color4f c)
  {
    stream << "(" << c.r << ", " << c.g << ", " << c.b << ", " << c.a << ")";
    return stream;
  }
 
  friend bool operator==(const Color4f &a, const Color4f &b)
  {
    return a.r == b.r && a.g == b.g && a.b == b.b && a.a == b.a;
  }
 
  friend bool operator!=(const Color4f &a, const Color4f &b)
  {
    return !(a == b);
  }
 
  uint64_t hash() const
  {
    uint64_t x1 = *reinterpret_cast<const uint32_t *>(&r);
    uint64_t x2 = *reinterpret_cast<const uint32_t *>(&g);
    uint64_t x3 = *reinterpret_cast<const uint32_t *>(&b);
    uint64_t x4 = *reinterpret_cast<const uint32_t *>(&a);
    return (x1 * 1283591) ^ (x2 * 850177) ^ (x3 * 735391) ^ (x4 * 442319);
  }
};
 
struct Color4b {
  uint8_t r, g, b, a;
 
  Color4b() = default;
 
  Color4b(uint8_t r, uint8_t g, uint8_t b, uint8_t a) : r(r), g(g), b(b), a(a)
  {
  }
 
  Color4b(Color4f other)
  {
    rgba_float_to_uchar(*this, other);
  }
 
  operator Color4f() const
  {
    Color4f result;
    rgba_uchar_to_float(result, *this);
    return result;
  }
 
  operator uint8_t *()
  {
    return &r;
  }
 
  operator const uint8_t *() const
  {
    return &r;
  }
 
  friend std::ostream &operator<<(std::ostream &stream, Color4b c)
  {
    stream << "(" << c.r << ", " << c.g << ", " << c.b << ", " << c.a << ")";
    return stream;
  }
 
  friend bool operator==(const Color4b &a, const Color4b &b)
  {
    return a.r == b.r && a.g == b.g && a.b == b.b && a.a == b.a;
  }
 
  friend bool operator!=(const Color4b &a, const Color4b &b)
  {
    return !(a == b);
  }
 
  uint64_t hash() const
  {
    return static_cast<uint64_t>(r * 1283591) ^ static_cast<uint64_t>(g * 850177) ^
           static_cast<uint64_t>(b * 735391) ^ static_cast<uint64_t>(a * 442319);
  }
};
 
}  // namespace blender