/* === S Y N F I G ========================================================= */
/*! \file lineargradient.cpp
** \brief Implementation of the "Linear 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
**
** === N O T E S ===========================================================
**
** ========================================================================= */
/* === H E A D E R S ======================================================= */
#ifdef USING_PCH
# include "pch.h"
#else
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "lineargradient.h"
#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>
#endif
/* === M A C R O S ========================================================= */
/* === G L O B A L S ======================================================= */
SYNFIG_LAYER_INIT(LinearGradient);
SYNFIG_LAYER_SET_NAME(LinearGradient,"linear_gradient");
SYNFIG_LAYER_SET_LOCAL_NAME(LinearGradient,N_("Linear Gradient"));
SYNFIG_LAYER_SET_CATEGORY(LinearGradient,N_("Gradients"));
SYNFIG_LAYER_SET_VERSION(LinearGradient,"0.0");
SYNFIG_LAYER_SET_CVS_ID(LinearGradient,"$Id$");
/* === P R O C E D U R E S ================================================= */
/* === M E T H O D S ======================================================= */
inline void
LinearGradient::sync()
{
diff=(p2-p1);
const Real mag(diff.inv_mag());
diff*=mag*mag;
}
LinearGradient::LinearGradient():
Layer_Composite(1.0,Color::BLEND_COMPOSITE),
p1(1,1),
p2(-1,-1),
gradient(Color::black(), Color::white()),
loop(false),
zigzag(false)
{
sync();
}
inline Color
LinearGradient::color_func(const Point &point, float supersample)const
{
Real dist(point*diff-p1*diff);
if(loop)
dist-=floor(dist);
if(zigzag)
{
dist*=2.0;
supersample*=2.0;
if(dist>1)dist=2.0-dist;
}
if(loop)
{
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);
if (zigzag) pool+=gradient(1.0-right*0.5,right).premult_alpha()*right/supersample;
else 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);
if (zigzag) pool+=gradient(left*0.5,left).premult_alpha()*left/supersample;
else pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
return pool.demult_alpha();
}
}
return gradient(dist,supersample);
}
float
LinearGradient::calc_supersample(const synfig::Point &/*x*/, float pw,float /*ph*/)const
{
return pw/(p2-p1).mag();
}
synfig::Layer::Handle
LinearGradient::hit_check(synfig::Context context, const synfig::Point &point)const
{
if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
return const_cast<LinearGradient*>(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<LinearGradient*>(this);
return context.hit_check(point);
}
bool
LinearGradient::set_param(const String & param, const ValueBase &value)
{
if(param=="p1" && value.same_type_as(p1))
{
p1=value.get(p1);
sync();
return true;
}
if(param=="p2" && value.same_type_as(p2))
{
p2=value.get(p2);
sync();
return true;
}
//IMPORT(p1);
//IMPORT(p2);
IMPORT(gradient);
IMPORT(loop);
IMPORT(zigzag);
return Layer_Composite::set_param(param,value);
}
ValueBase
LinearGradient::get_param(const String & param)const
{
EXPORT(p1);
EXPORT(p2);
EXPORT(gradient);
EXPORT(loop);
EXPORT(zigzag);
EXPORT_NAME();
EXPORT_VERSION();
return Layer_Composite::get_param(param);
}
Layer::Vocab
LinearGradient::get_param_vocab()const
{
Layer::Vocab ret(Layer_Composite::get_param_vocab());
ret.push_back(ParamDesc("p1")
.set_local_name(_("Point 1"))
.set_connect("p2")
);
ret.push_back(ParamDesc("p2")
.set_local_name(_("Point 2"))
);
ret.push_back(ParamDesc("gradient")
.set_local_name(_("Gradient"))
);
ret.push_back(ParamDesc("loop")
.set_local_name(_("Loop"))
);
ret.push_back(ParamDesc("zigzag")
.set_local_name(_("ZigZag"))
);
return ret;
}
Color
LinearGradient::get_color(Context context, const Point &point)const
{
const Color color(color_func(point));
if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
return color;
else
return Color::blend(color,context.get_color(point),get_amount(),get_blend_method());
}
bool
LinearGradient::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)
{
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::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
}
// Mark our progress as finished
if(cb && !cb->amount_complete(10000,10000))
return false;
return true;
}