1 /* === S Y N F I G ========================================================= */
2 /*! \file lineargradient.cpp
3 ** \brief Implementation of the "Linear Gradient" layer
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 ** === N O T E S ===========================================================
23 ** ========================================================================= */
25 /* === H E A D E R S ======================================================= */
34 #include "lineargradient.h"
36 #include <synfig/string.h>
37 #include <synfig/time.h>
38 #include <synfig/context.h>
39 #include <synfig/paramdesc.h>
40 #include <synfig/renddesc.h>
41 #include <synfig/surface.h>
42 #include <synfig/value.h>
43 #include <synfig/valuenode.h>
47 /* === M A C R O S ========================================================= */
49 /* === G L O B A L S ======================================================= */
51 SYNFIG_LAYER_INIT(LinearGradient);
52 SYNFIG_LAYER_SET_NAME(LinearGradient,"linear_gradient");
53 SYNFIG_LAYER_SET_LOCAL_NAME(LinearGradient,N_("Linear Gradient"));
54 SYNFIG_LAYER_SET_CATEGORY(LinearGradient,N_("Gradients"));
55 SYNFIG_LAYER_SET_VERSION(LinearGradient,"0.0");
56 SYNFIG_LAYER_SET_CVS_ID(LinearGradient,"$Id$");
58 /* === P R O C E D U R E S ================================================= */
60 /* === M E T H O D S ======================================================= */
63 LinearGradient::sync()
66 const Real mag(diff.inv_mag());
71 LinearGradient::LinearGradient():
72 Layer_Composite(1.0,Color::BLEND_COMPOSITE),
75 gradient(Color::black(), Color::white()),
80 Layer::Vocab voc(get_param_vocab());
81 Layer::fill_static(voc);
85 LinearGradient::color_func(const Point &point, float supersample)const
87 Real dist(point*diff-p1*diff);
96 if(dist>1)dist=2.0-dist;
101 if(dist+supersample*0.5>1.0)
103 float left(supersample*0.5-(dist-1.0));
104 float right(supersample*0.5+(dist-1.0));
105 Color pool(gradient(1.0-(left*0.5),left).premult_alpha()*left/supersample);
106 if (zigzag) pool+=gradient(1.0-right*0.5,right).premult_alpha()*right/supersample;
107 else pool+=gradient(right*0.5,right).premult_alpha()*right/supersample;
108 return pool.demult_alpha();
110 if(dist-supersample*0.5<0.0)
112 float left(supersample*0.5-dist);
113 float right(supersample*0.5+dist);
114 Color pool(gradient(right*0.5,right).premult_alpha()*right/supersample);
115 if (zigzag) pool+=gradient(left*0.5,left).premult_alpha()*left/supersample;
116 else pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
117 return pool.demult_alpha();
120 return gradient(dist,supersample);
124 LinearGradient::calc_supersample(const synfig::Point &/*x*/, float pw,float /*ph*/)const
126 return pw/(p2-p1).mag();
129 synfig::Layer::Handle
130 LinearGradient::hit_check(synfig::Context context, const synfig::Point &point)const
132 if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
133 return const_cast<LinearGradient*>(this);
134 if(get_amount()==0.0)
135 return context.hit_check(point);
136 if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
137 return const_cast<LinearGradient*>(this);
138 return context.hit_check(point);
142 LinearGradient::set_param(const String & param, const ValueBase &value)
144 if(param=="p1" && value.same_type_as(p1))
147 set_param_static(param, value.get_static());
151 if(param=="p2" && value.same_type_as(p2))
154 set_param_static(param, value.get_static());
165 return Layer_Composite::set_param(param,value);
169 LinearGradient::get_param(const String & param)const
180 return Layer_Composite::get_param(param);
184 LinearGradient::get_param_vocab()const
186 Layer::Vocab ret(Layer_Composite::get_param_vocab());
188 ret.push_back(ParamDesc("p1")
189 .set_local_name(_("Point 1"))
192 ret.push_back(ParamDesc("p2")
193 .set_local_name(_("Point 2"))
195 ret.push_back(ParamDesc("gradient")
196 .set_local_name(_("Gradient"))
198 ret.push_back(ParamDesc("loop")
199 .set_local_name(_("Loop"))
201 ret.push_back(ParamDesc("zigzag")
202 .set_local_name(_("ZigZag"))
209 LinearGradient::get_color(Context context, const Point &point)const
211 const Color color(color_func(point));
213 if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
216 return Color::blend(color,context.get_color(point),get_amount(),get_blend_method());
220 LinearGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
222 SuperCallback supercb(cb,0,9500,10000);
224 if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
226 surface->set_wh(renddesc.get_w(),renddesc.get_h());
230 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
239 Surface::pen pen(surface->begin());
240 const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
242 Point tl(renddesc.get_tl());
243 const int w(surface->get_w());
244 const int h(surface->get_h());
246 if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
248 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
249 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
250 pen.put_value(color_func(pos,calc_supersample(pos,pw,ph)));
254 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
255 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
256 pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
259 // Mark our progress as finished
260 if(cb && !cb->amount_complete(10000,10000))