/* === S Y N F I G ========================================================= */
/*! \file mod_gradient/radialgradient.cpp
** \brief Implementation of the "Radial Gradient" layer
**
** $Id$
**
** \legal
** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
** Copyright (c) 2007 Chris Moore
** Copyright (c) 2011-2013 Carlos López
**
** 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/localization.h>
#include <synfig/general.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>
#include "radialgradient.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(RadialGradient);
SYNFIG_LAYER_SET_NAME(RadialGradient,"radial_gradient");
SYNFIG_LAYER_SET_LOCAL_NAME(RadialGradient,N_("Radial Gradient"));
SYNFIG_LAYER_SET_CATEGORY(RadialGradient,N_("Gradients"));
SYNFIG_LAYER_SET_VERSION(RadialGradient,"0.1");
SYNFIG_LAYER_SET_CVS_ID(RadialGradient,"$Id$");
/* === 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 ================================================= */
RadialGradient::RadialGradient():
Layer_Composite(1.0,Color::BLEND_COMPOSITE),
param_gradient(ValueBase(Gradient(Color::black(),Color::white()))),
param_center(ValueBase(Point(0,0))),
param_radius(ValueBase(Real(0.5))),
param_loop(ValueBase(false)),
param_zigzag(ValueBase(false))
{
SET_INTERPOLATION_DEFAULTS();
SET_STATIC_DEFAULTS();
}
bool
RadialGradient::set_param(const String & param, const ValueBase &value)
{
IMPORT_VALUE_PLUS(param_gradient, compile());
IMPORT_VALUE(param_center);
IMPORT_VALUE(param_radius);
IMPORT_VALUE_PLUS(param_loop, compile());
IMPORT_VALUE_PLUS(param_zigzag, compile());
return Layer_Composite::set_param(param,value);
}
ValueBase
RadialGradient::get_param(const String ¶m)const
{
EXPORT_VALUE(param_gradient);
EXPORT_VALUE(param_center);
EXPORT_VALUE(param_radius);
EXPORT_VALUE(param_loop);
EXPORT_VALUE(param_zigzag);
EXPORT_NAME();
EXPORT_VERSION();
return Layer_Composite::get_param(param);
}
Layer::Vocab
RadialGradient::get_param_vocab()const
{
Layer::Vocab ret(Layer_Composite::get_param_vocab());
ret.push_back(ParamDesc("gradient")
.set_local_name(_("Gradient"))
.set_description(_("Gradient to apply"))
);
ret.push_back(ParamDesc("center")
.set_local_name(_("Center"))
.set_description(_("Center of the gradient"))
);
ret.push_back(ParamDesc("radius")
.set_local_name(_("Radius"))
.set_description(_("This is the radius of the circle"))
.set_is_distance()
.set_origin("center")
);
ret.push_back(ParamDesc("loop")
.set_local_name(_("Loop"))
.set_description(_("When checked the gradient is looped"))
);
ret.push_back(ParamDesc("zigzag")
.set_local_name(_("ZigZag"))
.set_description(_("When checked the gradient is symmetrical at the center"))
);
return ret;
}
void
RadialGradient::compile()
{
compiled_gradient.set(
param_gradient.get(Gradient()),
param_loop.get(bool()),
param_zigzag.get(bool()) );
}
inline Color
RadialGradient::color_func(const Point &point, Real supersample)const
{
Point center = param_center.get(Point());
Real radius = param_radius.get(Real());
Real dist((point-center).mag()/radius);
supersample *= 0.5;
return compiled_gradient.average(dist - supersample, dist + supersample);
}
Real
RadialGradient::calc_supersample(const synfig::Point &/*x*/, Real pw, Real /*ph*/)const
{
Real radius=param_radius.get(Real());
// return sqrt(pw*pw+ph*ph)/radius;
return 1.2*pw/radius;
}
synfig::Layer::Handle
RadialGradient::hit_check(synfig::Context context, const synfig::Point &point)const
{
if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
return const_cast<RadialGradient*>(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<RadialGradient*>(this);
return context.hit_check(point);
}
Color
RadialGradient::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
RadialGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
{
RENDER_TRANSFORMED_IF_NEED(__FILE__, __LINE__)
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;
}
bool
RadialGradient::accelerated_cairorender(Context context,cairo_t *cr, int quality, const RendDesc &renddesc, ProgressCallback *cb)const
{
Gradient gradient=param_gradient.get(Gradient());
Point center=param_center.get(Point());
Real radius=param_radius.get(Real());
bool loop=param_loop.get(bool());
cairo_save(cr);
cairo_pattern_t* pattern=cairo_pattern_create_radial(center[0], center[1], 0.0 ,center[0], center[1], radius);
bool cpoints_all_opaque=compile_gradient(pattern, gradient);
if(loop)
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
if(quality>8) cairo_pattern_set_filter(pattern, CAIRO_FILTER_FAST);
else if(quality>=4) cairo_pattern_set_filter(pattern, CAIRO_FILTER_GOOD);
else cairo_pattern_set_filter(pattern, CAIRO_FILTER_BEST);
if(
!
(is_solid_color() ||
(cpoints_all_opaque && get_blend_method()==Color::BLEND_COMPOSITE && get_amount()==1.f))
)
{
// Initially render what's behind us
if(!context.accelerated_cairorender(cr,quality,renddesc,cb))
{
if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Cairo Renderer Failure",__LINE__));
return false;
}
}
cairo_set_source(cr, pattern);
cairo_paint_with_alpha_operator(cr, get_amount(), get_blend_method());
cairo_pattern_destroy(pattern); // Not needed more
cairo_restore(cr);
return true;
}
bool
RadialGradient::compile_gradient(cairo_pattern_t* pattern, Gradient mygradient)const
{
bool zigzag=param_zigzag.get(bool());
bool loop=param_loop.get(bool());
bool cpoints_all_opaque=true;
float a,r,g,b;
Gradient::CPoint cp;
Gradient::const_iterator iter;
mygradient.sort();
if(zigzag)
{
Gradient zgradient;
for(iter=mygradient.begin();iter!=mygradient.end(); iter++)
{
cp=*iter;
cp.pos=cp.pos/2;
zgradient.push_back(cp);
}
for(iter=mygradient.begin();iter!=mygradient.end(); iter++)
{
cp=*iter;
cp.pos=1.0-cp.pos/2;
zgradient.push_back(cp);
}
mygradient=zgradient;
}
mygradient.sort();
if(loop)
{
cp=*mygradient.begin();
a=cp.color.get_a();
r=cp.color.get_r();
g=cp.color.get_g();
b=cp.color.get_b();
cairo_pattern_add_color_stop_rgba(pattern, 0.0, r, g, b, a);
}
for(iter=mygradient.begin();iter!=mygradient.end(); iter++)
{
cp=*iter;
a=cp.color.get_a();
r=cp.color.get_r();
g=cp.color.get_g();
b=cp.color.get_b();
cairo_pattern_add_color_stop_rgba(pattern, cp.pos, r, g, b, a);
if(a!=1.0) cpoints_all_opaque=false;
}
if(loop)
{
cp=*(--mygradient.end());
a=cp.color.get_a();
r=cp.color.get_r();
g=cp.color.get_g();
b=cp.color.get_b();
cairo_pattern_add_color_stop_rgba(pattern, 1.0, r, g, b, a);
}
return cpoints_all_opaque;
}