/* === S Y N F I G ========================================================= */
/*! \file spiralgradient.cpp
** \brief Implementation of the "Spiral Gradient" layer
**
** $Id$
**
** \legal
** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
** Copyright (c) 2011 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 <synfig/cairo_renddesc.h>
#include "spiralgradient.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(SpiralGradient);
SYNFIG_LAYER_SET_NAME(SpiralGradient,"spiral_gradient");
SYNFIG_LAYER_SET_LOCAL_NAME(SpiralGradient,N_("Spiral Gradient"));
SYNFIG_LAYER_SET_CATEGORY(SpiralGradient,N_("Gradients"));
SYNFIG_LAYER_SET_VERSION(SpiralGradient,"0.1");
SYNFIG_LAYER_SET_CVS_ID(SpiralGradient,"$Id$");
/* === 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 ================================================= */
SpiralGradient::SpiralGradient():
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_angle(ValueBase(Angle::zero())),
param_clockwise(ValueBase(false))
{
SET_INTERPOLATION_DEFAULTS();
SET_STATIC_DEFAULTS();
}
bool
SpiralGradient::set_param(const String & param, const ValueBase &value)
{
IMPORT_VALUE_PLUS(param_gradient, compile());
IMPORT_VALUE(param_center);
IMPORT_VALUE(param_radius);
IMPORT_VALUE(param_angle);
IMPORT_VALUE(param_clockwise);
return Layer_Composite::set_param(param,value);
}
ValueBase
SpiralGradient::get_param(const String ¶m)const
{
EXPORT_VALUE(param_gradient);
EXPORT_VALUE(param_center);
EXPORT_VALUE(param_radius);
EXPORT_VALUE(param_angle);
EXPORT_VALUE(param_clockwise);
EXPORT_NAME();
EXPORT_VERSION();
return Layer_Composite::get_param(param);
}
Layer::Vocab
SpiralGradient::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("angle")
.set_local_name(_("Angle"))
.set_description(_("Rotation of the spiral"))
.set_origin("center")
);
ret.push_back(ParamDesc("clockwise")
.set_local_name(_("Clockwise"))
.set_description(_("When checked the spiral turns clockwise"))
);
return ret;
}
void
SpiralGradient::compile()
{ compiled_gradient.set(param_gradient.get(Gradient()), true); }
inline Color
SpiralGradient::color_func(const Point &pos, Real supersample)const
{
Point center=param_center.get(Point());
Real radius=param_radius.get(Real());
Angle angle=param_angle.get(Angle());
bool clockwise=param_clockwise.get(bool());
const Point centered(pos-center);
Angle a;
a=Angle::tan(-centered[1],centered[0]).mod();
a=a+angle;
if(supersample<0.00001)supersample=0.00001;
Real dist((pos-center).mag()/radius);
if(clockwise)
dist+=Angle::rot(a.mod()).get();
else
dist-=Angle::rot(a.mod()).get();
supersample *= 0.5;
return compiled_gradient.average(dist - supersample, dist + supersample);
}
Real
SpiralGradient::calc_supersample(const synfig::Point &x, Real pw, Real /*ph*/)const
{
Point center=param_center.get(Point());
Real radius=param_radius.get(Real());
return (1.41421*pw/radius+(1.41421*pw/Point(x-center).mag())/(PI*2))*0.5;
}
synfig::Layer::Handle
SpiralGradient::hit_check(synfig::Context context, const synfig::Point &point)const
{
if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
return const_cast<SpiralGradient*>(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<SpiralGradient*>(this);
return context.hit_check(point);
}
Color
SpiralGradient::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
SpiralGradient::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
SpiralGradient::accelerated_cairorender(Context context, cairo_t *cr,int quality, const RendDesc &renddesc_, ProgressCallback *cb)const
{
RendDesc renddesc(renddesc_);
// Untransform the render desc
if(!cairo_renddesc_untransform(cr, renddesc))
return false;
Point pos;
const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
const Point tl(renddesc.get_tl());
const int w(renddesc.get_w());
const int h(renddesc.get_h());
SuperCallback supercb(cb,0,9500,10000);
if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
{
cairo_save(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_paint(cr);
cairo_restore(cr);
}
else
{
if(!context.accelerated_cairorender(cr,quality,renddesc,&supercb))
return false;
if(get_amount()==0)
return true;
}
int x,y;
cairo_surface_t *surface;
surface=cairo_surface_create_similar(cairo_get_target(cr), CAIRO_CONTENT_COLOR_ALPHA, w, h);
CairoSurface csurface(surface);
if(!csurface.map_cairo_image())
{
synfig::warning("Spiral Gradient: map cairo surface failed");
return false;
}
for(y=0,pos[1]=tl[1];y<h;y++,pos[1]+=ph)
for(x=0,pos[0]=tl[0];x<w;x++,pos[0]+=pw)
csurface[y][x]=CairoColor(color_func(pos,calc_supersample(pos,pw,ph))).premult_alpha();
csurface.unmap_cairo_image();
// paint surface on cr
cairo_save(cr);
cairo_translate(cr, tl[0], tl[1]);
cairo_scale(cr, pw, ph);
cairo_set_source_surface(cr, surface, 0, 0);
cairo_paint_with_alpha_operator(cr, get_amount(), get_blend_method());
cairo_restore(cr);
cairo_surface_destroy(surface);
// Mark our progress as finished
if(cb && !cb->amount_complete(10000,10000))
return false;
return true;
}