/* === S Y N F I G ========================================================= */
/*! \file
** \brief Color class function implementation
**
** $Id$
**
** \legal
** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
** Copyright (c) 2007, 2008 Chris Moore
** Copyright (c) 2012-2013 Carlos López
** Copyright (c) 2015 Diego Barrios Romero
**
** This package 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 package 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.
** \endlegal
*/
/* ========================================================================= */
#ifndef __SYNFIG_COLOR_COLOR_HPP
#define __SYNFIG_COLOR_COLOR_HPP
#include <cmath>
#include <cassert>
#include <stdint.h>
#include <synfig/string.h>
#include <synfig/angle.h>
#ifdef USING_PCH
# include "pch.h"
#else
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <ETL/angle>
#include <cstdio>
#endif
namespace synfig {
Color& Color::operator+=(const Color &rhs)
{
r_+=rhs.r_;
g_+=rhs.g_;
b_+=rhs.b_;
a_+=rhs.a_;
return *this;
}
Color& Color::operator-=(const Color &rhs)
{
r_-=rhs.r_;
g_-=rhs.g_;
b_-=rhs.b_;
a_-=rhs.a_;
return *this;
}
Color& Color::operator*=(const float &rhs)
{
r_*=rhs;
g_*=rhs;
b_*=rhs;
a_*=rhs;
return *this;
}
Color& Color::operator/=(const float &rhs)
{
const float temp(value_type(1)/rhs);
r_*=temp;
g_*=temp;
b_*=temp;
a_*=temp;
return *this;
}
Color Color::operator+(const Color &rhs) const
{
return Color(*this)+=rhs;
}
Color Color::operator-(const Color &rhs) const
{ return Color(*this)-=rhs; }
Color Color::operator*(const float &rhs)const
{ return Color(*this)*=rhs; }
Color Color::operator/(const float &rhs)const
{ return Color(*this)/=rhs; }
bool Color::operator<(const Color &rhs)const
{
return r_<rhs.r_ ? true : rhs.r_<r_ ? false
: g_<rhs.g_ ? true : rhs.g_<g_ ? false
: b_<rhs.b_ ? true : rhs.b_<b_ ? false
: a_<rhs.a_;
}
bool Color::operator==(const Color &rhs)const
{ return r_==rhs.r_ && g_==rhs.g_ && b_==rhs.b_ && a_==rhs.a_; }
bool Color::operator!=(const Color &rhs)const
{ return r_!=rhs.r_ || g_!=rhs.g_ || b_!=rhs.b_ || a_!=rhs.a_; }
Color Color::operator-()const
{ return Color(-r_,-g_,-b_,-a_); }
//! Effectively 1.0-color
Color Color::operator~()const
{ return Color(1.0f-r_,1.0f-g_,1.0f-b_,a_); }
bool Color::is_valid()const
{ return !std::isnan(r_) && !std::isnan(g_) && !std::isnan(b_) && !std::isnan(a_); }
Color Color::premult_alpha() const
{
return Color (r_*a_, g_*a_, b_*a_, a_);
}
Color Color::demult_alpha() const
{
if(a_)
{
const value_type inva = 1/a_;
return Color (r_*inva, g_*inva, b_*inva, a_);
}else return alpha();
}
Color::Color() :r_(0), g_(0), b_(0),a_(0) { }
Color::Color(const value_type &f) :r_(f), g_(f), b_(f),a_(f) { }
Color::Color(int f) :r_(f), g_(f), b_(f),a_(f) { }
Color::Color(const value_type& R,
const value_type& G,
const value_type& B,
const value_type& A):
r_(R),
g_(G),
b_(B),
a_(A) { }
Color::Color(const Color& c, const value_type& A):
r_(c.r_),
g_(c.g_),
b_(c.b_),
a_(A) { }
Color::Color(const Color& c):
r_(c.r_),
g_(c.g_),
b_(c.b_),
a_(c.a_) { }
const String Color::get_hex()const
{
return String(real2hex(r_) + real2hex(g_) + real2hex(b_));
}
//! Returns color's luminance
float Color::get_y() const
{
return
(float)get_r()*EncodeYUV[0][0]+
(float)get_g()*EncodeYUV[0][1]+
(float)get_b()*EncodeYUV[0][2];
}
//! Returns U component of chromanance
float Color::get_u() const
{
return
(float)get_r()*EncodeYUV[1][0]+
(float)get_g()*EncodeYUV[1][1]+
(float)get_b()*EncodeYUV[1][2];
}
//! Returns V component of chromanance
float Color::get_v() const
{
return
(float)get_r()*EncodeYUV[2][0]+
(float)get_g()*EncodeYUV[2][1]+
(float)get_b()*EncodeYUV[2][2];
}
//! Returns the color's saturation
/*! This is is the magnitude of the U and V components.
** \see set_s() */
float Color::get_s() const
{
const float u(get_u()), v(get_v());
return sqrt(u*u+v*v);
}
//! Sets the luminance (\a y) and chromanance (\a u and \a v)
Color& Color::set_yuv(const float &y, const float &u, const float &v)
{
set_r(y*DecodeYUV[0][0]+u*DecodeYUV[0][1]+v*DecodeYUV[0][2]);
set_g(y*DecodeYUV[1][0]+u*DecodeYUV[1][1]+v*DecodeYUV[1][2]);
set_b(y*DecodeYUV[2][0]+u*DecodeYUV[2][1]+v*DecodeYUV[2][2]);
return *this;
}
//! Sets color luminance
Color& Color::set_y(const float &y) { return set_yuv(y,get_u(),get_v()); }
//! Set U component of chromanance
Color& Color::set_u(const float &u) { return set_yuv(get_y(),u,get_v()); }
//! Set V component of chromanance
Color& Color::set_v(const float &v) { return set_yuv(get_y(),get_u(),v); }
//! Set the U and V components of chromanance
Color& Color::set_uv(const float& u, const float& v) { return set_yuv(get_y(),u,v); }
//! Sets the color's saturation
/*! \see get_s() */
Color& Color::set_s(const float &x)
{
float u(get_u()), v(get_v());
const float s(sqrt(u*u+v*v));
if(s)
{
u=(u/s)*x;
v=(v/s)*x;
return set_uv(u,v);
}
return *this;
}
//! YUV Color constructor
Color Color::YUV(const float& y, const float& u, const float& v, const value_type& a)
{ return Color().set_yuv(y,u,v).set_a(a); }
//! Returns the hue of the chromanance
/*! This is the angle of the U and V components.
** \see set_hue() */
Angle Color::get_hue() const
{ return Angle::tan(get_u(),get_v()); }
//! Synonym for get_hue(). \see get_hue()
Angle Color::get_uv_angle() const { return get_hue(); }
//! Sets the color's hue
/*! \see get_hue() */
Color& Color::set_hue(const Angle& theta)
{
const float s(get_s());
const float
u(s*(float)Angle::sin(theta).get()),
v(s*(float)Angle::cos(theta).get());
return set_uv(u,v);
}
//! Synonym for set_hue(). \see set_hue()
Color& Color::set_uv_angle(const Angle& theta) { return set_hue(theta); }
//! Rotates the chromanance vector by amount specified by \a theta
Color& Color::rotate_uv(const Angle& theta)
{
const float a(Angle::sin(theta).get()), b(Angle::cos(theta).get());
const float u(get_u()), v(get_v());
return set_uv(b*u-a*v,a*u+b*v);
}
Color& Color::set_yuv(const float& y, const float& s, const Angle& theta)
{
return
set_yuv(
y,
s*(float)Angle::sin(theta).get(),
s*(float)Angle::cos(theta).get()
);
}
Color Color::YUV(const float& y, const float& s, const Angle& theta, const value_type& a)
{ return Color().set_yuv(y,s,theta).set_a(a); }
} // synfig namespace
#endif // __SYNFIG_COLOR_COLOR_HPP