1 /* === S Y N F I G ========================================================= */
2 /*! \file mod_gradient/radialgradient.cpp
3 ** \brief Template Header
8 ** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
10 ** This package is free software; you can redistribute it and/or
11 ** modify it under the terms of the GNU General Public License as
12 ** published by the Free Software Foundation; either version 2 of
13 ** the License, or (at your option) any later version.
15 ** This package is distributed in the hope that it will be useful,
16 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ** General Public License for more details.
21 /* ========================================================================= */
23 /* === H E A D E R S ======================================================= */
32 #include <synfig/string.h>
33 #include <synfig/time.h>
34 #include <synfig/context.h>
35 #include <synfig/paramdesc.h>
36 #include <synfig/renddesc.h>
37 #include <synfig/surface.h>
38 #include <synfig/value.h>
39 #include <synfig/valuenode.h>
41 #include "radialgradient.h"
45 /* === U S I N G =========================================================== */
49 using namespace synfig;
51 /* === G L O B A L S ======================================================= */
53 SYNFIG_LAYER_INIT(RadialGradient);
54 SYNFIG_LAYER_SET_NAME(RadialGradient,"radial_gradient");
55 SYNFIG_LAYER_SET_LOCAL_NAME(RadialGradient,_("Radial Gradient"));
56 SYNFIG_LAYER_SET_CATEGORY(RadialGradient,_("Gradients"));
57 SYNFIG_LAYER_SET_VERSION(RadialGradient,"0.1");
58 SYNFIG_LAYER_SET_CVS_ID(RadialGradient,"$Id$");
60 /* === P R O C E D U R E S ================================================= */
62 /* === M E T H O D S ======================================================= */
64 /* === E N T R Y P O I N T ================================================= */
66 RadialGradient::RadialGradient():
67 Layer_Composite(1.0,Color::BLEND_STRAIGHT),
68 gradient(Color::black(),Color::white()),
77 RadialGradient::set_param(const String & param, const ValueBase &value)
85 return Layer_Composite::set_param(param,value);
89 RadialGradient::get_param(const String ¶m)const
100 return Layer_Composite::get_param(param);
104 RadialGradient::get_param_vocab()const
106 Layer::Vocab ret(Layer_Composite::get_param_vocab());
108 ret.push_back(ParamDesc("gradient")
109 .set_local_name(_("Gradient"))
112 ret.push_back(ParamDesc("center")
113 .set_local_name(_("Center"))
116 ret.push_back(ParamDesc("radius")
117 .set_local_name(_("Radius"))
118 .set_description(_("This is the radius of the circle"))
120 .set_origin("center")
123 ret.push_back(ParamDesc("loop")
124 .set_local_name(_("Loop"))
127 ret.push_back(ParamDesc("zigzag")
128 .set_local_name(_("ZigZag"))
135 RadialGradient::color_func(const Point &point, float supersample)const
137 Real dist((point-center).mag()/radius);
143 if(dist>1)dist=2.0-dist;
150 if(dist+supersample*0.5>1.0)
152 float left(supersample*0.5-(dist-1.0));
153 float right(supersample*0.5+(dist-1.0));
154 Color pool(gradient(1.0-(left*0.5),left).premult_alpha()*left/supersample);
155 if (zigzag) pool+=gradient(1.0-right*0.5,right).premult_alpha()*right/supersample;
156 else pool+=gradient(right*0.5,right).premult_alpha()*right/supersample;
157 return pool.demult_alpha();
159 if(dist-supersample*0.5<0.0)
161 float left(supersample*0.5-dist);
162 float right(supersample*0.5+dist);
163 Color pool(gradient(right*0.5,right).premult_alpha()*right/supersample);
164 if (zigzag) pool+=gradient(left*0.5,left).premult_alpha()*left/supersample;
165 else pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
166 return pool.demult_alpha();
170 return gradient(dist,supersample);
175 RadialGradient::calc_supersample(const synfig::Point &/*x*/, float pw,float /*ph*/)const
177 // return sqrt(pw*pw+ph*ph)/radius;
178 return 1.2*pw/radius;
181 synfig::Layer::Handle
182 RadialGradient::hit_check(synfig::Context context, const synfig::Point &point)const
184 if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
185 return const_cast<RadialGradient*>(this);
186 if(get_amount()==0.0)
187 return context.hit_check(point);
188 if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
189 return const_cast<RadialGradient*>(this);
190 return context.hit_check(point);
194 RadialGradient::get_color(Context context, const Point &pos)const
196 const Color color(color_func(pos));
198 if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
201 return Color::blend(color,context.get_color(pos),get_amount(),get_blend_method());
205 RadialGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
207 SuperCallback supercb(cb,0,9500,10000);
209 if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
211 surface->set_wh(renddesc.get_w(),renddesc.get_h());
215 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
224 Surface::pen pen(surface->begin());
225 const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
227 Point tl(renddesc.get_tl());
228 const int w(surface->get_w());
229 const int h(surface->get_h());
231 if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
233 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
234 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
235 pen.put_value(color_func(pos,calc_supersample(pos,pw,ph)));
239 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
240 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
241 pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
244 // Mark our progress as finished
245 if(cb && !cb->amount_complete(10000,10000))