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                 .set_description(_("Gradient to apply"))
 110         );
 111
 112         ret.push_back(ParamDesc("center")
 113                 .set_local_name(_("Center"))
 114                 .set_description(_("Center of the cone"))
 115         );
 116
 117         ret.push_back(ParamDesc("angle")
 118                 .set_local_name(_("Angle"))
 119                 .set_origin("center")
 120                 .set_description(_("Rotation of the gradient around the center"))
 121         );
 122
 123         ret.push_back(ParamDesc("symmetric")
 124                 .set_local_name(_("Symmetric"))
 125                 .set_description(_("When checked the gradient is looped"))
 126         );
 127
 128         return ret;
 129 }
 130
 131 inline Color
 132 ConicalGradient::color_func(const Point &pos, float supersample)const
 133 {
 134         const Point centered(pos-center);
 135         Angle::rot a=Angle::tan(-centered[1],centered[0]).mod();
 136         a+=angle;
 137         Real dist(a.mod().get());
 138
 139         dist-=floor(dist);
 140
 141         if(symmetric)
 142         {
 143                 dist*=2.0;
 144                 supersample*=2.0;
 145                 if(dist>1)dist=2.0-dist;
 146         }
 147 /*      if(dist+supersample*0.5>1.0)
 148         {
 149                 Color pool(gradient(dist,supersample*0.5)*(1.0-(dist-supersample*0.5)));
 150                 pool+=gradient((dist+supersample*0.5)-1.0,supersample*0.5)*((dist+supersample*0.5)-1.0);
 151                 if(pool.get_a() && pool.is_valid())
 152                 {
 153                         pool.set_r(pool.get_r()/pool.get_a());
 154                         pool.set_g(pool.get_g()/pool.get_a());
 155                         pool.set_b(pool.get_b()/pool.get_a());
 156                         pool.set_a(pool.get_a()/supersample);
 157                 }
 158                 return pool;
 159         }
 160
 161         if(dist-supersample*0.5<0.0)
 162         {
 163                 Color pool(gradient(dist,supersample*0.5)*(dist+supersample*0.5));
 164                 pool+=gradient(1.0-(dist-supersample*0.5),supersample*0.5)*(-(dist-supersample*0.5));
 165                 if(pool.get_a() && pool.is_valid())
 166                 {
 167                         pool.set_r(pool.get_r()/pool.get_a());
 168                         pool.set_g(pool.get_g()/pool.get_a());
 169                         pool.set_b(pool.get_b()/pool.get_a());
 170                         pool.set_a(pool.get_a()/supersample);
 171                         return pool;
 172                 }
 173         }
 174 */
 175         if(dist+supersample*0.5>1.0)
 176         {
 177                 float  left(supersample*0.5-(dist-1.0));
 178                 float right(supersample*0.5+(dist-1.0));
 179                 Color pool(gradient(1.0-(left*0.5),left).premult_alpha()*left/supersample);
 180                 pool+=gradient(right*0.5,right).premult_alpha()*right/supersample;
 181                 return pool.demult_alpha();
 182         }
 183         if(dist-supersample*0.5<0.0)
 184         {
 185                 float  left(supersample*0.5-dist);
 186                 float right(supersample*0.5+dist);
 187                 Color pool(gradient(right*0.5,right).premult_alpha()*right/supersample);
 188                 pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
 189                 return pool.demult_alpha();
 190         }
 191
 192         return gradient(dist,supersample);
 193 }
 194
 195 float
 196 ConicalGradient::calc_supersample(const synfig::Point &x, float pw,float ph)const
 197 {
 198         Point adj(x-center);
 199         if(abs(adj[0])<abs(pw*0.5) && abs(adj[1])<abs(ph*0.5))
 200                 return 0.5;
 201         return (pw/Point(x-center).mag())/(PI*2);
 202 }
 203
 204 synfig::Layer::Handle
 205 ConicalGradient::hit_check(synfig::Context context, const synfig::Point &point)const
 206 {
 207         if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
 208                 return const_cast<ConicalGradient*>(this);
 209         if(get_amount()==0.0)
 210                 return context.hit_check(point);
 211         if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
 212                 return const_cast<ConicalGradient*>(this);
 213         return context.hit_check(point);
 214 }
 215
 216 Color
 217 ConicalGradient::get_color(Context context, const Point &pos)const
 218 {
 219         const Color color(color_func(pos));
 220
 221         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 222                 return color;
 223         else
 224                 return Color::blend(color,context.get_color(pos),get_amount(),get_blend_method());
 225 }
 226
 227 bool
 228 ConicalGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 229 {
 230         SuperCallback supercb(cb,0,9500,10000);
 231
 232         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 233         {
 234                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 235         }
 236         else
 237         {
 238                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 239                         return false;
 240                 if(get_amount()==0)
 241                         return true;
 242         }
 243
 244
 245         int x,y;
 246
 247         Surface::pen pen(surface->begin());
 248         const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
 249         Point pos;
 250         Point tl(renddesc.get_tl());
 251         const int w(surface->get_w());
 252         const int h(surface->get_h());
 253
 254         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 255         {
 256                 if(quality<9)
 257                 {
 258                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 259                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 260                                         pen.put_value(color_func(pos,calc_supersample(pos,pw,ph)));
 261                 }
 262                 else
 263                 {
 264                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 265                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 266                                         pen.put_value(color_func(pos,0));
 267                 }
 268         }
 269         else
 270         {
 271                 if(quality<9)
 272                 {
 273                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 274                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 275                                         pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
 276                 }
 277                 else
 278                 {
 279                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 280                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 281                                         pen.put_value(Color::blend(color_func(pos,0),pen.get_value(),get_amount(),get_blend_method()));
 282                 }
 283         }
 284
 285         // Mark our progress as finished
 286         if(cb && !cb->amount_complete(10000,10000))
 287                 return false;
 288
 289         return true;
 290 }