synfig-core/src/modules/mod_gradient/conicalgradient.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file conicalgradient.cpp
   3 **      \brief Implementation of the "Conical Gradient" layer
   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 #include <synfig/angle.h>
  41
  42 #include "conicalgradient.h"
  43
  44 #endif
  45
  46 /* === U S I N G =========================================================== */
  47
  48 using namespace etl;
  49 using namespace std;
  50 using namespace synfig;
  51
  52 /* === G L O B A L S ======================================================= */
  53
  54 SYNFIG_LAYER_INIT(ConicalGradient);
  55 SYNFIG_LAYER_SET_NAME(ConicalGradient,"conical_gradient");
  56 SYNFIG_LAYER_SET_LOCAL_NAME(ConicalGradient,N_("Conical Gradient"));
  57 SYNFIG_LAYER_SET_CATEGORY(ConicalGradient,N_("Gradients"));
  58 SYNFIG_LAYER_SET_VERSION(ConicalGradient,"0.1");
  59 SYNFIG_LAYER_SET_CVS_ID(ConicalGradient,"$Id$");
  60
  61 /* === P R O C E D U R E S ================================================= */
  62
  63 /* === M E T H O D S ======================================================= */
  64
  65 /* === E N T R Y P O I N T ================================================= */
  66
  67 ConicalGradient::ConicalGradient():
  68         Layer_Composite(1.0,Color::BLEND_COMPOSITE),
  69         gradient(Color::black(),Color::white()),
  70         center(0,0),
  71         angle(Angle::zero()),
  72         symmetric(false)
  73 {
  74         Layer::Vocab voc(get_param_vocab());
  75         Layer::fill_static(voc);
  76 }
  77
  78 bool
  79 ConicalGradient::set_param(const String & param, const ValueBase &value)
  80 {
  81         IMPORT(gradient);
  82         IMPORT(center);
  83         IMPORT(angle);
  84         IMPORT(symmetric);
  85         return Layer_Composite::set_param(param,value);
  86 }
  87
  88 ValueBase
  89 ConicalGradient::get_param(const String &param)const
  90 {
  91         EXPORT(gradient);
  92         EXPORT(center);
  93         EXPORT(angle);
  94         EXPORT(symmetric);
  95
  96         EXPORT_NAME();
  97         EXPORT_VERSION();
  98
  99         return Layer_Composite::get_param(param);
 100 }
 101
 102 Layer::Vocab
 103 ConicalGradient::get_param_vocab()const
 104 {
 105         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 106
 107         ret.push_back(ParamDesc("gradient")
 108                 .set_local_name(_("Gradient"))
 109         );
 110
 111         ret.push_back(ParamDesc("center")
 112                 .set_local_name(_("Center"))
 113         );
 114
 115         ret.push_back(ParamDesc("angle")
 116                 .set_local_name(_("Angle"))
 117                 .set_origin("center")
 118         );
 119
 120         ret.push_back(ParamDesc("symmetric")
 121                 .set_local_name(_("Symmetric"))
 122         );
 123
 124         return ret;
 125 }
 126
 127 inline Color
 128 ConicalGradient::color_func(const Point &pos, float supersample)const
 129 {
 130         const Point centered(pos-center);
 131         Angle::rot a=Angle::tan(-centered[1],centered[0]).mod();
 132         a+=angle;
 133         Real dist(a.mod().get());
 134
 135         dist-=floor(dist);
 136
 137         if(symmetric)
 138         {
 139                 dist*=2.0;
 140                 supersample*=2.0;
 141                 if(dist>1)dist=2.0-dist;
 142         }
 143 /*      if(dist+supersample*0.5>1.0)
 144         {
 145                 Color pool(gradient(dist,supersample*0.5)*(1.0-(dist-supersample*0.5)));
 146                 pool+=gradient((dist+supersample*0.5)-1.0,supersample*0.5)*((dist+supersample*0.5)-1.0);
 147                 if(pool.get_a() && pool.is_valid())
 148                 {
 149                         pool.set_r(pool.get_r()/pool.get_a());
 150                         pool.set_g(pool.get_g()/pool.get_a());
 151                         pool.set_b(pool.get_b()/pool.get_a());
 152                         pool.set_a(pool.get_a()/supersample);
 153                 }
 154                 return pool;
 155         }
 156
 157         if(dist-supersample*0.5<0.0)
 158         {
 159                 Color pool(gradient(dist,supersample*0.5)*(dist+supersample*0.5));
 160                 pool+=gradient(1.0-(dist-supersample*0.5),supersample*0.5)*(-(dist-supersample*0.5));
 161                 if(pool.get_a() && pool.is_valid())
 162                 {
 163                         pool.set_r(pool.get_r()/pool.get_a());
 164                         pool.set_g(pool.get_g()/pool.get_a());
 165                         pool.set_b(pool.get_b()/pool.get_a());
 166                         pool.set_a(pool.get_a()/supersample);
 167                         return pool;
 168                 }
 169         }
 170 */
 171         if(dist+supersample*0.5>1.0)
 172         {
 173                 float  left(supersample*0.5-(dist-1.0));
 174                 float right(supersample*0.5+(dist-1.0));
 175                 Color pool(gradient(1.0-(left*0.5),left).premult_alpha()*left/supersample);
 176                 pool+=gradient(right*0.5,right).premult_alpha()*right/supersample;
 177                 return pool.demult_alpha();
 178         }
 179         if(dist-supersample*0.5<0.0)
 180         {
 181                 float  left(supersample*0.5-dist);
 182                 float right(supersample*0.5+dist);
 183                 Color pool(gradient(right*0.5,right).premult_alpha()*right/supersample);
 184                 pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
 185                 return pool.demult_alpha();
 186         }
 187
 188         return gradient(dist,supersample);
 189 }
 190
 191 float
 192 ConicalGradient::calc_supersample(const synfig::Point &x, float pw,float ph)const
 193 {
 194         Point adj(x-center);
 195         if(abs(adj[0])<abs(pw*0.5) && abs(adj[1])<abs(ph*0.5))
 196                 return 0.5;
 197         return (pw/Point(x-center).mag())/(PI*2);
 198 }
 199
 200 synfig::Layer::Handle
 201 ConicalGradient::hit_check(synfig::Context context, const synfig::Point &point)const
 202 {
 203         if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
 204                 return const_cast<ConicalGradient*>(this);
 205         if(get_amount()==0.0)
 206                 return context.hit_check(point);
 207         if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
 208                 return const_cast<ConicalGradient*>(this);
 209         return context.hit_check(point);
 210 }
 211
 212 Color
 213 ConicalGradient::get_color(Context context, const Point &pos)const
 214 {
 215         const Color color(color_func(pos));
 216
 217         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 218                 return color;
 219         else
 220                 return Color::blend(color,context.get_color(pos),get_amount(),get_blend_method());
 221 }
 222
 223 bool
 224 ConicalGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 225 {
 226         SuperCallback supercb(cb,0,9500,10000);
 227
 228         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 229         {
 230                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 231         }
 232         else
 233         {
 234                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 235                         return false;
 236                 if(get_amount()==0)
 237                         return true;
 238         }
 239
 240
 241         int x,y;
 242
 243         Surface::pen pen(surface->begin());
 244         const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
 245         Point pos;
 246         Point tl(renddesc.get_tl());
 247         const int w(surface->get_w());
 248         const int h(surface->get_h());
 249
 250         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 251         {
 252                 if(quality<9)
 253                 {
 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_func(pos,calc_supersample(pos,pw,ph)));
 257                 }
 258                 else
 259                 {
 260                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 261                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 262                                         pen.put_value(color_func(pos,0));
 263                 }
 264         }
 265         else
 266         {
 267                 if(quality<9)
 268                 {
 269                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 270                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 271                                         pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
 272                 }
 273                 else
 274                 {
 275                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 276                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 277                                         pen.put_value(Color::blend(color_func(pos,0),pen.get_value(),get_amount(),get_blend_method()));
 278                 }
 279         }
 280
 281         // Mark our progress as finished
 282         if(cb && !cb->amount_complete(10000,10000))
 283                 return false;
 284
 285         return true;
 286 }