--- /dev/null
+/* === S Y N F I G ========================================================= */
+/*! \file color.h
+** \brief Color Class
+**
+** $Id: color.cpp,v 1.2 2005/01/23 04:03:21 darco Exp $
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**
+** 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
+*/
+/* ========================================================================= */
+
+/* === H E A D E R S ======================================================= */
+
+#ifdef USING_PCH
+# include "pch.h"
+#else
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <ETL/angle>
+#include "color.h"
+#include <cstdio>
+
+#endif
+
+using namespace synfig;
+using namespace etl;
+using namespace std;
+
+/* === M A C R O S ========================================================= */
+
+#define COLOR_EPSILON (0.000001f)
+
+/* === G L O B A L S ======================================================= */
+
+/* === P R O C E D U R E S ================================================= */
+
+/* === M E T H O D S ======================================================= */
+
+
+
+#if 0
+Color&
+Color::rotate_uv(const Angle& theta)const
+{
+/*/
+ Color ret(*this);
+ ret.set_hue(ret.get_hue()+theta);
+ return ret;
+/*/
+ 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);
+ //return YUV(get_y(),b*u-a*v,a*u+b*v,get_a());
+//*/
+}
+#endif
+
+Color
+Color::clamped_negative()const
+{
+ Color ret=*this;
+
+ if(ret.a_==0)
+ return alpha();
+
+ if(ret.a_<0)
+ ret=-ret;
+
+ if(ret.r_<0)
+ {
+ ret.g_-=ret.r_;
+ ret.b_-=ret.r_;
+ ret.r_=0.0f;
+ }
+ if(ret.g_<0)
+ {
+ ret.r_-=ret.g_;
+ ret.b_-=ret.g_;
+ ret.g_=0.0f;
+ }
+ if(ret.b_<0)
+ {
+ ret.r_-=ret.b_;
+ ret.g_-=ret.b_;
+ ret.b_=0.0f;
+ }
+
+ if(ret.r_>1) ret.r_=1;
+ if(ret.g_>1) ret.g_=1;
+ if(ret.b_>1) ret.b_=1;
+ if(ret.a_>1) ret.a_=1;
+
+ if(isnan(ret.get_r())) ret.r_=0.5;
+ if(isnan(ret.get_g())) ret.g_=0.5;
+ if(isnan(ret.get_b())) ret.b_=0.5;
+ if(isnan(ret.get_a())) ret.a_=1;
+
+/*
+ if(ret.r_>1) { ret.g_/=ret.r_; ret.b_/=ret.r_; ret.r_=1; }
+ if(ret.g_>1) { ret.r_/=ret.g_; ret.b_/=ret.g_; ret.g_=1; }
+ if(ret.b_>1) { ret.g_/=ret.b_; ret.r_/=ret.b_; ret.b_=1; }
+ if(ret.a_>1) ret.a_=1;
+*/
+
+ return ret;
+}
+
+Color
+Color::clamped()const
+{
+ Color ret(*this);
+ if(ret.get_r()<0)
+ ret.set_r(0);
+ if(ret.get_g()<0)
+ ret.set_g(0);
+ if(ret.get_b()<0)
+ ret.set_b(0);
+ if(ret.get_a()<0)
+ ret.set_a(0);
+
+ if(ret.r_>1) ret.r_=1;
+ if(ret.g_>1) ret.g_=1;
+ if(ret.b_>1) ret.b_=1;
+ if(ret.a_>1) ret.a_=1;
+
+ if(isnan(ret.get_r())) ret.r_=0.5;
+ if(isnan(ret.get_g())) ret.g_=0.5;
+ if(isnan(ret.get_b())) ret.b_=0.5;
+ if(isnan(ret.get_a())) ret.a_=1;
+
+ return(ret);
+}
+
+typedef Color (*blendfunc)(Color &,Color &,float);
+
+static Color
+blendfunc_COMPOSITE(Color &src,Color &dest,float amount)
+{
+ //c_dest'=c_src+(1.0-a_src)*c_dest
+ //a_dest'=a_src+(1.0-a_src)*a_dest
+
+ float a_src=src.get_a()*amount;
+ float a_dest=dest.get_a();
+
+ // if a_arc==0.0
+ //if(fabsf(a_src)<COLOR_EPSILON) return dest;
+
+ // Scale the source and destination by their alpha values
+ src*=a_src;
+ dest*=a_dest;
+
+ dest=src + dest*(1.0f-a_src);
+
+ a_dest=a_src + a_dest*(1.0f-a_src);
+
+ // if a_dest!=0.0
+ if(fabsf(a_dest)>COLOR_EPSILON)
+ {
+ dest/=a_dest;
+ dest.set_a(a_dest);
+ }
+ else
+ {
+ dest=Color::alpha();
+ }
+ assert(dest.is_valid());
+ return dest;
+}
+
+static Color
+blendfunc_STRAIGHT(Color &src,Color &bg,float amount)
+{
+ //a_out'=(a_src-a_bg)*amount+a_bg
+ //c_out'=(((c_src*a_src)-(c_bg*a_bg))*amount+(c_bg*a_bg))/a_out'
+
+ // ie: if(amount==1.0)
+ //if(fabsf(amount-1.0f)<COLOR_EPSILON)return src;
+
+ Color out;
+
+ float a_out((src.get_a()-bg.get_a())*amount+bg.get_a());
+
+ // if a_out!=0.0
+ if(fabsf(a_out)>COLOR_EPSILON)
+// if(a_out>COLOR_EPSILON || a_out<-COLOR_EPSILON)
+ {
+ out=((src*src.get_a()-bg*bg.get_a())*amount+bg*bg.get_a())/a_out;
+ out.set_a(a_out);
+ }
+ else
+ out=Color::alpha();
+
+ assert(out.is_valid());
+ return out;
+}
+
+static Color
+blendfunc_ONTO(Color &a,Color &b,float amount)
+{
+ float alpha(b.get_a());
+ return blendfunc_COMPOSITE(a,b.set_a(1.0f),amount).set_a(alpha);
+}
+
+static Color
+blendfunc_STRAIGHT_ONTO(Color &a,Color &b,float amount)
+{
+ a.set_a(a.get_a()*b.get_a());
+ return blendfunc_STRAIGHT(a,b,amount);
+}
+
+static Color
+blendfunc_BRIGHTEN(Color &a,Color &b,float amount)
+{
+ const float alpha(a.get_a()*amount);
+
+ if(b.get_r()<a.get_r()*alpha)
+ b.set_r(a.get_r()*alpha);
+
+ if(b.get_g()<a.get_g()*alpha)
+ b.set_g(a.get_g()*alpha);
+
+ if(b.get_b()<a.get_b()*alpha)
+ b.set_b(a.get_b()*alpha);
+
+ return b;
+}
+
+static Color
+blendfunc_DARKEN(Color &a,Color &b,float amount)
+{
+ const float alpha(a.get_a()*amount);
+
+ if(b.get_r()>(a.get_r()-1.0f)*alpha+1.0f)
+ b.set_r((a.get_r()-1.0f)*alpha+1.0f);
+
+ if(b.get_g()>(a.get_g()-1.0f)*alpha+1.0f)
+ b.set_g((a.get_g()-1.0f)*alpha+1.0f);
+
+ if(b.get_b()>(a.get_b()-1.0f)*alpha+1.0f)
+ b.set_b((a.get_b()-1.0f)*alpha+1.0f);
+
+
+ return b;
+}
+
+static Color
+blendfunc_ADD(Color &a,Color &b,float amount)
+{
+ const float alpha(a.get_a()*amount);
+
+ b.set_r(b.get_r()+a.get_r()*alpha);
+ b.set_g(b.get_g()+a.get_g()*alpha);
+ b.set_b(b.get_b()+a.get_b()*alpha);
+
+ return b;
+}
+
+static Color
+blendfunc_SUBTRACT(Color &a,Color &b,float amount)
+{
+ const float alpha(a.get_a()*amount);
+
+ b.set_r(b.get_r()-a.get_r()*alpha);
+ b.set_g(b.get_g()-a.get_g()*alpha);
+ b.set_b(b.get_b()-a.get_b()*alpha);
+
+ return b;
+}
+
+static Color
+blendfunc_DIFFERENCE(Color &a,Color &b,float amount)
+{
+ const float alpha(a.get_a()*amount);
+
+ b.set_r(abs(b.get_r()-a.get_r()*alpha));
+ b.set_g(abs(b.get_g()-a.get_g()*alpha));
+ b.set_b(abs(b.get_b()-a.get_b()*alpha));
+
+ return b;
+}
+
+static Color
+blendfunc_MULTIPLY(Color &a,Color &b,float amount)
+{
+ if(amount<0) a=~a, amount=-amount;
+
+ amount*=a.get_a();
+ b.set_r(((b.get_r()*a.get_r())-b.get_r())*(amount)+b.get_r());
+ b.set_g(((b.get_g()*a.get_g())-b.get_g())*(amount)+b.get_g());
+ b.set_b(((b.get_b()*a.get_b())-b.get_b())*(amount)+b.get_b());
+ return b;
+}
+
+static Color
+blendfunc_DIVIDE(Color &a,Color &b,float amount)
+{
+ amount*=a.get_a();
+
+ // We add COLOR_EPSILON in order to avoid a divide-by-zero condition.
+ // This causes DIVIDE to bias toward positive values, but the effect is
+ // really neglegable. There is a reason why we use COLOR_EPSILON--we
+ // want the change to be imperceptable.
+
+ b.set_r(((b.get_r()/(a.get_r()+COLOR_EPSILON))-b.get_r())*(amount)+b.get_r());
+ b.set_g(((b.get_g()/(a.get_g()+COLOR_EPSILON))-b.get_g())*(amount)+b.get_g());
+ b.set_b(((b.get_b()/(a.get_b()+COLOR_EPSILON))-b.get_b())*(amount)+b.get_b());
+
+ return b;
+}
+
+static Color
+blendfunc_COLOR(Color &a,Color &b,float amount)
+{
+ Color temp(b);
+ temp.set_uv(a.get_u(),a.get_v());
+ return (temp-b)*amount*a.get_a()+b;
+}
+
+static Color
+blendfunc_HUE(Color &a,Color &b,float amount)
+{
+ Color temp(b);
+ temp.set_hue(a.get_hue());
+ return (temp-b)*amount*a.get_a()+b;
+}
+
+static Color
+blendfunc_SATURATION(Color &a,Color &b,float amount)
+{
+ Color temp(b);
+ temp.set_s(a.get_s());
+ return (temp-b)*amount*a.get_a()+b;
+}
+
+static Color
+blendfunc_LUMINANCE(Color &a,Color &b,float amount)
+{
+ Color temp(b);
+ temp.set_y(a.get_y());
+ return (temp-b)*amount*a.get_a()+b;
+}
+
+static Color
+blendfunc_BEHIND(Color &a,Color &b,float amount)
+{
+ if(a.get_a()==0)a.set_a(COLOR_EPSILON); //!< \hack
+ a.set_a(a.get_a()*amount);
+ return blendfunc_COMPOSITE(b,a,1.0);
+}
+
+static Color
+blendfunc_ALPHA_BRIGHTEN(Color &a,Color &b,float amount)
+{
+ if(a.get_a()<b.get_a()*amount)
+ return a.set_a(a.get_a()*amount);
+ return b;
+}
+
+static Color
+blendfunc_ALPHA_DARKEN(Color &a,Color &b,float amount)
+{
+ if(a.get_a()*amount>b.get_a())
+ return a.set_a(a.get_a()*amount);
+ return b;
+}
+
+static Color
+blendfunc_SCREEN(Color &a,Color &b,float amount)
+{
+ if(amount<0) a=~a, amount=-amount;
+
+ a.set_r(1.0-(1.0f-a.get_r())*(1.0f-b.get_r()));
+ a.set_g(1.0-(1.0f-a.get_g())*(1.0f-b.get_g()));
+ a.set_b(1.0-(1.0f-a.get_b())*(1.0f-b.get_b()));
+
+ return blendfunc_ONTO(a,b,amount);
+}
+
+static Color
+blendfunc_OVERLAY(Color &a,Color &b,float amount)
+{
+ if(amount<0) a=~a, amount=-amount;
+
+ Color rm;
+ rm.set_r(b.get_r()*a.get_r());
+ rm.set_g(b.get_g()*a.get_g());
+ rm.set_b(b.get_b()*a.get_b());
+
+ Color rs;
+ rs.set_r(1.0-(1.0f-a.get_r())*(1.0f-b.get_r()));
+ rs.set_g(1.0-(1.0f-a.get_g())*(1.0f-b.get_g()));
+ rs.set_b(1.0-(1.0f-a.get_b())*(1.0f-b.get_b()));
+
+ Color& ret(a);
+
+ ret.set_r(a.get_r()*rs.get_r() + (1.0-a.get_r())*rm.get_r());
+ ret.set_g(a.get_g()*rs.get_g() + (1.0-a.get_g())*rm.get_g());
+ ret.set_b(a.get_b()*rs.get_b() + (1.0-a.get_b())*rm.get_b());
+
+ return blendfunc_ONTO(ret,b,amount);
+}
+
+static Color
+blendfunc_HARD_LIGHT(Color &a,Color &b,float amount)
+{
+ if(amount<0) a=~a, amount=-amount;
+
+ if(a.get_r()>0.5f) a.set_r(1.0-(1.0f-(a.get_r()*2.0f-1.0f))*(1.0f-b.get_r()));
+ else a.set_r(b.get_r()*(a.get_r()*2.0f));
+ if(a.get_g()>0.5f) a.set_g(1.0-(1.0f-(a.get_g()*2.0f-1.0f))*(1.0f-b.get_g()));
+ else a.set_g(b.get_g()*(a.get_g()*2.0f));
+ if(a.get_b()>0.5f) a.set_b(1.0-(1.0f-(a.get_b()*2.0f-1.0f))*(1.0f-b.get_b()));
+ else a.set_b(b.get_b()*(a.get_b()*2.0f));
+
+ return blendfunc_ONTO(a,b,amount);
+}
+
+static Color
+blendfunc_ALPHA_OVER(Color &a,Color &b,float amount)
+{
+ Color rm(b);
+
+ //multiply the inverse alpha channel with the one below us
+ rm.set_a((1-a.get_a())*b.get_a());
+
+ return blendfunc_STRAIGHT(rm,b,amount);
+}
+
+
+Color
+Color::blend(Color a, Color b,float amount, Color::BlendMethod type)
+{
+#if 0
+ if(isnan(a.get_r()) || isnan(a.get_g()) || isnan(a.get_b()))
+ {
+#ifdef _DEBUG
+ a=magenta().set_a(a.get_a());
+#else
+ a=black().set_a(a.get_a());
+#endif
+ }
+
+ if(isnan(b.get_r()) || isnan(b.get_g()) || isnan(b.get_b()))
+ {
+#ifdef _DEBUG
+ b=magenta().set_a(b.get_a());
+#else
+ b=black().set_a(b.get_a());
+#endif
+ }
+#endif
+
+/*
+ if(!a.is_valid()&&b.is_valid())
+ return b;
+
+ if(a.is_valid()&&!b.is_valid())
+ return a;
+
+ if(!a.is_valid()||!b.is_valid())
+ {
+#ifdef _DEBUG
+ return magenta();
+#else
+ return black();
+#endif
+ }
+*/
+
+ // No matter what blend method is being used,
+ // if the amount is equal to zero, then only B
+ // will shine through
+ if(fabsf(amount)<=COLOR_EPSILON)return b;
+
+ assert(type<BLEND_END);
+
+ const static blendfunc vtable[BLEND_END]=
+ {
+ blendfunc_COMPOSITE,
+ blendfunc_STRAIGHT,
+ blendfunc_BRIGHTEN,
+ blendfunc_DARKEN,
+ blendfunc_ADD,
+ blendfunc_SUBTRACT,
+ blendfunc_MULTIPLY,
+ blendfunc_DIVIDE,
+ blendfunc_COLOR,
+ blendfunc_HUE,
+ blendfunc_SATURATION,
+ blendfunc_LUMINANCE,
+ blendfunc_BEHIND,
+ blendfunc_ONTO,
+ blendfunc_ALPHA_BRIGHTEN,
+ blendfunc_ALPHA_DARKEN,
+ blendfunc_SCREEN,
+ blendfunc_HARD_LIGHT,
+ blendfunc_DIFFERENCE,
+ blendfunc_ALPHA_OVER,
+ blendfunc_OVERLAY,
+ blendfunc_STRAIGHT_ONTO,
+ };
+
+ return vtable[type](a,b,amount);
+}
projects / synfig.git / blobdiff