1 /* === S Y N F I G ========================================================= */
2 /*! \file mod_gradient/radialgradient.cpp
3 ** \brief Implementation of the "Radial Gradient" layer
8 ** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
9 ** Copyright (c) 2007 Chris Moore
11 ** This package is free software; you can redistribute it and/or
12 ** modify it under the terms of the GNU General Public License as
13 ** published by the Free Software Foundation; either version 2 of
14 ** the License, or (at your option) any later version.
16 ** This package is distributed in the hope that it will be useful,
17 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ** General Public License for more details.
22 /* ========================================================================= */
24 /* === H E A D E R S ======================================================= */
33 #include <synfig/string.h>
34 #include <synfig/time.h>
35 #include <synfig/context.h>
36 #include <synfig/paramdesc.h>
37 #include <synfig/renddesc.h>
38 #include <synfig/surface.h>
39 #include <synfig/value.h>
40 #include <synfig/valuenode.h>
42 #include "radialgradient.h"
46 /* === U S I N G =========================================================== */
50 using namespace synfig;
52 /* === G L O B A L S ======================================================= */
54 SYNFIG_LAYER_INIT(RadialGradient);
55 SYNFIG_LAYER_SET_NAME(RadialGradient,"radial_gradient");
56 SYNFIG_LAYER_SET_LOCAL_NAME(RadialGradient,N_("Radial Gradient"));
57 SYNFIG_LAYER_SET_CATEGORY(RadialGradient,N_("Gradients"));
58 SYNFIG_LAYER_SET_VERSION(RadialGradient,"0.1");
59 SYNFIG_LAYER_SET_CVS_ID(RadialGradient,"$Id$");
61 /* === P R O C E D U R E S ================================================= */
63 /* === M E T H O D S ======================================================= */
65 /* === E N T R Y P O I N T ================================================= */
67 RadialGradient::RadialGradient():
68 Layer_Composite(1.0,Color::BLEND_STRAIGHT),
69 gradient(Color::black(),Color::white()),
78 RadialGradient::set_param(const String & param, const ValueBase &value)
86 return Layer_Composite::set_param(param,value);
90 RadialGradient::get_param(const String ¶m)const
101 return Layer_Composite::get_param(param);
105 RadialGradient::get_param_vocab()const
107 Layer::Vocab ret(Layer_Composite::get_param_vocab());
109 ret.push_back(ParamDesc("gradient")
110 .set_local_name(_("Gradient"))
113 ret.push_back(ParamDesc("center")
114 .set_local_name(_("Center"))
117 ret.push_back(ParamDesc("radius")
118 .set_local_name(_("Radius"))
119 .set_description(_("This is the radius of the circle"))
121 .set_origin("center")
124 ret.push_back(ParamDesc("loop")
125 .set_local_name(_("Loop"))
128 ret.push_back(ParamDesc("zigzag")
129 .set_local_name(_("ZigZag"))
136 RadialGradient::color_func(const Point &point, float supersample)const
138 Real dist((point-center).mag()/radius);
144 if(dist>1)dist=2.0-dist;
151 if(dist+supersample*0.5>1.0)
153 float left(supersample*0.5-(dist-1.0));
154 float right(supersample*0.5+(dist-1.0));
155 Color pool(gradient(1.0-(left*0.5),left).premult_alpha()*left/supersample);
156 if (zigzag) pool+=gradient(1.0-right*0.5,right).premult_alpha()*right/supersample;
157 else pool+=gradient(right*0.5,right).premult_alpha()*right/supersample;
158 return pool.demult_alpha();
160 if(dist-supersample*0.5<0.0)
162 float left(supersample*0.5-dist);
163 float right(supersample*0.5+dist);
164 Color pool(gradient(right*0.5,right).premult_alpha()*right/supersample);
165 if (zigzag) pool+=gradient(left*0.5,left).premult_alpha()*left/supersample;
166 else pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
167 return pool.demult_alpha();
171 return gradient(dist,supersample);
176 RadialGradient::calc_supersample(const synfig::Point &/*x*/, float pw,float /*ph*/)const
178 // return sqrt(pw*pw+ph*ph)/radius;
179 return 1.2*pw/radius;
182 synfig::Layer::Handle
183 RadialGradient::hit_check(synfig::Context context, const synfig::Point &point)const
185 if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
186 return const_cast<RadialGradient*>(this);
187 if(get_amount()==0.0)
188 return context.hit_check(point);
189 if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
190 return const_cast<RadialGradient*>(this);
191 return context.hit_check(point);
195 RadialGradient::get_color(Context context, const Point &pos)const
197 const Color color(color_func(pos));
199 if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
202 return Color::blend(color,context.get_color(pos),get_amount(),get_blend_method());
206 RadialGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
208 SuperCallback supercb(cb,0,9500,10000);
210 if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
212 surface->set_wh(renddesc.get_w(),renddesc.get_h());
216 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
225 Surface::pen pen(surface->begin());
226 const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
228 Point tl(renddesc.get_tl());
229 const int w(surface->get_w());
230 const int h(surface->get_h());
232 if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
234 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
235 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
236 pen.put_value(color_func(pos,calc_supersample(pos,pw,ph)));
240 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
241 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
242 pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
245 // Mark our progress as finished
246 if(cb && !cb->amount_complete(10000,10000))