/* === S Y N F I G ========================================================= */
/*! \file conicalgradient.cpp
** \brief Implementation of the "Conical Gradient" layer
**
** $Id$
**
** \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 <synfig/string.h>
#include <synfig/time.h>
#include <synfig/context.h>
#include <synfig/paramdesc.h>
#include <synfig/renddesc.h>
#include <synfig/surface.h>
#include <synfig/value.h>
#include <synfig/valuenode.h>
#include <synfig/angle.h>
#include "conicalgradient.h"
#endif
/* === U S I N G =========================================================== */
using namespace etl;
using namespace std;
using namespace synfig;
/* === G L O B A L S ======================================================= */
SYNFIG_LAYER_INIT(ConicalGradient);
SYNFIG_LAYER_SET_NAME(ConicalGradient,"conical_gradient");
SYNFIG_LAYER_SET_LOCAL_NAME(ConicalGradient,N_("Conical Gradient"));
SYNFIG_LAYER_SET_CATEGORY(ConicalGradient,N_("Gradients"));
SYNFIG_LAYER_SET_VERSION(ConicalGradient,"0.1");
SYNFIG_LAYER_SET_CVS_ID(ConicalGradient,"$Id$");
/* === P R O C E D U R E S ================================================= */
/* === M E T H O D S ======================================================= */
/* === E N T R Y P O I N T ================================================= */
ConicalGradient::ConicalGradient():
Layer_Composite(1.0,Color::BLEND_STRAIGHT),
gradient(Color::black(),Color::white()),
center(0,0),
angle(Angle::zero()),
symmetric(false)
{
}
bool
ConicalGradient::set_param(const String & param, const ValueBase &value)
{
IMPORT(gradient);
IMPORT(center);
IMPORT(angle);
IMPORT(symmetric);
return Layer_Composite::set_param(param,value);
}
ValueBase
ConicalGradient::get_param(const String ¶m)const
{
EXPORT(gradient);
EXPORT(center);
EXPORT(angle);
EXPORT(symmetric);
EXPORT_NAME();
EXPORT_VERSION();
return Layer_Composite::get_param(param);
}
Layer::Vocab
ConicalGradient::get_param_vocab()const
{
Layer::Vocab ret(Layer_Composite::get_param_vocab());
ret.push_back(ParamDesc("gradient")
.set_local_name(_("Gradient"))
);
ret.push_back(ParamDesc("center")
.set_local_name(_("Center"))
);
ret.push_back(ParamDesc("angle")
.set_local_name(_("Angle"))
.set_origin("center")
);
ret.push_back(ParamDesc("symmetric")
.set_local_name(_("Symmetric"))
);
return ret;
}
inline Color
ConicalGradient::color_func(const Point &pos, float supersample)const
{
const Point centered(pos-center);
Angle::rot a=Angle::tan(-centered[1],centered[0]).mod();
a+=angle;
Real dist(a.mod().get());
dist-=floor(dist);
if(symmetric)
{
dist*=2.0;
supersample*=2.0;
if(dist>1)dist=2.0-dist;
}
/* if(dist+supersample*0.5>1.0)
{
Color pool(gradient(dist,supersample*0.5)*(1.0-(dist-supersample*0.5)));
pool+=gradient((dist+supersample*0.5)-1.0,supersample*0.5)*((dist+supersample*0.5)-1.0);
if(pool.get_a() && pool.is_valid())
{
pool.set_r(pool.get_r()/pool.get_a());
pool.set_g(pool.get_g()/pool.get_a());
pool.set_b(pool.get_b()/pool.get_a());
pool.set_a(pool.get_a()/supersample);
}
return pool;
}
if(dist-supersample*0.5<0.0)
{
Color pool(gradient(dist,supersample*0.5)*(dist+supersample*0.5));
pool+=gradient(1.0-(dist-supersample*0.5),supersample*0.5)*(-(dist-supersample*0.5));
if(pool.get_a() && pool.is_valid())
{
pool.set_r(pool.get_r()/pool.get_a());
pool.set_g(pool.get_g()/pool.get_a());
pool.set_b(pool.get_b()/pool.get_a());
pool.set_a(pool.get_a()/supersample);
return pool;
}
}
*/
if(dist+supersample*0.5>1.0)
{
float left(supersample*0.5-(dist-1.0));
float right(supersample*0.5+(dist-1.0));
Color pool(gradient(1.0-(left*0.5),left).premult_alpha()*left/supersample);
pool+=gradient(right*0.5,right).premult_alpha()*right/supersample;
return pool.demult_alpha();
}
if(dist-supersample*0.5<0.0)
{
float left(supersample*0.5-dist);
float right(supersample*0.5+dist);
Color pool(gradient(right*0.5,right).premult_alpha()*right/supersample);
pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
return pool.demult_alpha();
}
return gradient(dist,supersample);
}
float
ConicalGradient::calc_supersample(const synfig::Point &x, float pw,float ph)const
{
Point adj(x-center);
if(abs(adj[0])<abs(pw*0.5) && abs(adj[1])<abs(ph*0.5))
return 0.5;
return (pw/Point(x-center).mag())/(PI*2);
}
synfig::Layer::Handle
ConicalGradient::hit_check(synfig::Context context, const synfig::Point &point)const
{
if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
return const_cast<ConicalGradient*>(this);
if(get_amount()==0.0)
return context.hit_check(point);
if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
return const_cast<ConicalGradient*>(this);
return context.hit_check(point);
}
Color
ConicalGradient::get_color(Context context, const Point &pos)const
{
const Color color(color_func(pos));
if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
return color;
else
return Color::blend(color,context.get_color(pos),get_amount(),get_blend_method());
}
bool
ConicalGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
{
SuperCallback supercb(cb,0,9500,10000);
if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
{
surface->set_wh(renddesc.get_w(),renddesc.get_h());
}
else
{
if(!context.accelerated_render(surface,quality,renddesc,&supercb))
return false;
if(get_amount()==0)
return true;
}
int x,y;
Surface::pen pen(surface->begin());
const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
Point pos;
Point tl(renddesc.get_tl());
const int w(surface->get_w());
const int h(surface->get_h());
if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
{
if(quality<9)
{
for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
pen.put_value(color_func(pos,calc_supersample(pos,pw,ph)));
}
else
{
for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
pen.put_value(color_func(pos,0));
}
}
else
{
if(quality<9)
{
for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
}
else
{
for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
pen.put_value(Color::blend(color_func(pos,0),pen.get_value(),get_amount(),get_blend_method()));
}
}
// Mark our progress as finished
if(cb && !cb->amount_complete(10000,10000))
return false;
return true;
}