synfig-core/tags/synfig_0_61_06/src/modules/lyr_std/radialgradient.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file lyr_std/radialgradient.cpp
   3 **      \brief Template Header
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **
  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.
  14 **
  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.
  19 **      \endlegal
  20 */
  21 /* ========================================================================= */
  22
  23 /* === H E A D E R S ======================================================= */
  24
  25 #ifdef USING_PCH
  26 #       include "pch.h"
  27 #else
  28 #ifdef HAVE_CONFIG_H
  29 #       include <config.h>
  30 #endif
  31
  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>
  40
  41 #include "radialgradient.h"
  42
  43 #endif
  44
  45 /* === U S I N G =========================================================== */
  46
  47 using namespace etl;
  48 using namespace std;
  49 using namespace synfig;
  50
  51 /* === G L O B A L S ======================================================= */
  52
  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,"$Id$");
  59
  60 /* === P R O C E D U R E S ================================================= */
  61
  62 /* === M E T H O D S ======================================================= */
  63
  64 /* === E N T R Y P O I N T ================================================= */
  65
  66 RadialGradient::RadialGradient():
  67         Layer_Composite(1.0,Color::BLEND_STRAIGHT),
  68         gradient(Color::black(),Color::white()),
  69         center(0,0),
  70         radius(0.5),
  71         loop(false),
  72         zigzag(false)
  73 {
  74 }
  75
  76 bool
  77 RadialGradient::set_param(const String & param, const ValueBase &value)
  78 {
  79         IMPORT(gradient);
  80         IMPORT(center);
  81         IMPORT(radius);
  82         IMPORT(loop);
  83         IMPORT(zigzag);
  84
  85         return Layer_Composite::set_param(param,value);
  86 }
  87
  88 ValueBase
  89 RadialGradient::get_param(const String &param)const
  90 {
  91         EXPORT(gradient);
  92         EXPORT(center);
  93         EXPORT(radius);
  94         EXPORT(loop);
  95         EXPORT(zigzag);
  96
  97         EXPORT_NAME();
  98         EXPORT_VERSION();
  99
 100         return Layer_Composite::get_param(param);
 101 }
 102
 103 Layer::Vocab
 104 RadialGradient::get_param_vocab()const
 105 {
 106         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 107
 108         ret.push_back(ParamDesc("gradient")
 109                 .set_local_name(_("Gradient"))
 110         );
 111
 112         ret.push_back(ParamDesc("center")
 113                 .set_local_name(_("Center"))
 114         );
 115
 116         ret.push_back(ParamDesc("radius")
 117                 .set_local_name(_("Radius"))
 118                 .set_description(_("This is the radius of the circle"))
 119                 .set_origin("center")
 120         );
 121
 122         ret.push_back(ParamDesc("loop")
 123                 .set_local_name(_("Loop"))
 124         );
 125
 126         ret.push_back(ParamDesc("zigzag")
 127                 .set_local_name(_("Zig-Zag"))
 128         );
 129
 130         return ret;
 131 }
 132
 133 inline Color
 134 RadialGradient::color_func(const Point &point, float supersample)const
 135 {
 136         Real dist((point-center).mag()/radius);
 137
 138         if(zigzag)
 139         {
 140                 dist*=2.0;
 141                 supersample*=2.0;
 142                 if(dist>1)dist=2.0-dist;
 143         }
 144
 145         if(loop)
 146         {
 147                 dist-=floor(dist);
 148
 149                 if(dist+supersample*0.5>1.0)
 150                 {
 151                         Color pool(gradient(dist,supersample*0.5)*(1.0-(dist-supersample*0.5)));
 152                         pool+=gradient((dist+supersample*0.5)-1.0,supersample*0.5)*((dist+supersample*0.5)-1.0);
 153                         if(pool.get_a() && pool.is_valid())
 154                         {
 155                                 pool.set_r(pool.get_r()/pool.get_a());
 156                                 pool.set_g(pool.get_g()/pool.get_a());
 157                                 pool.set_b(pool.get_b()/pool.get_a());
 158                                 pool.set_a(pool.get_a()/supersample);
 159                         }
 160                         return pool;
 161                 }
 162                 if(dist-supersample*0.5<0.0)
 163                 {
 164                         Color pool(gradient(dist,supersample*0.5)*(dist+supersample*0.5));
 165                         pool+=gradient(1.0-(dist-supersample*0.5),supersample*0.5)*(-(dist-supersample*0.5));
 166                         if(pool.get_a() && pool.is_valid())
 167                         {
 168                                 pool.set_r(pool.get_r()/pool.get_a());
 169                                 pool.set_g(pool.get_g()/pool.get_a());
 170                                 pool.set_b(pool.get_b()/pool.get_a());
 171                                 pool.set_a(pool.get_a()/supersample);
 172                                 return pool;
 173                         }
 174                 }
 175         }
 176
 177         return gradient(dist,supersample);
 178 }
 179
 180
 181 float
 182 RadialGradient::calc_supersample(const synfig::Point &x, float pw,float ph)const
 183 {
 184 //      return sqrt(pw*pw+ph*ph)/radius;
 185         return 1.2*pw/radius;
 186 }
 187
 188 synfig::Layer::Handle
 189 RadialGradient::hit_check(synfig::Context context, const synfig::Point &point)const
 190 {
 191         if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
 192                 return const_cast<RadialGradient*>(this);
 193         if(get_amount()==0.0)
 194                 return context.hit_check(point);
 195         if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
 196                 return const_cast<RadialGradient*>(this);
 197         return context.hit_check(point);
 198 }
 199
 200 Color
 201 RadialGradient::get_color(Context context, const Point &pos)const
 202 {
 203         const Color color(color_func(pos));
 204
 205         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 206                 return color;
 207         else
 208                 return Color::blend(color,context.get_color(pos),get_amount(),get_blend_method());
 209 }
 210
 211 bool
 212 RadialGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 213 {
 214         SuperCallback supercb(cb,0,9500,10000);
 215
 216         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 217         {
 218                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 219         }
 220         else
 221         {
 222                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 223                         return false;
 224                 if(get_amount()==0)
 225                         return true;
 226         }
 227
 228
 229         int x,y;
 230
 231         Surface::pen pen(surface->begin());
 232         const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
 233         Point pos;
 234         Point tl(renddesc.get_tl());
 235         const int w(surface->get_w());
 236         const int h(surface->get_h());
 237
 238         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 239         {
 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_func(pos,calc_supersample(pos,pw,ph)));
 243         }
 244         else
 245         {
 246                 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 247                         for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 248                                 pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
 249         }
 250
 251         // Mark our progress as finished
 252         if(cb && !cb->amount_complete(10000,10000))
 253                 return false;
 254
 255         return true;
 256 }