synfig-core/tags/synfig_0_61_03/synfig-core/src/modules/mod_gradient/conicalgradient.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file conicalgradient.cpp
   3 **      \brief Template Header
   4 **
   5 **      $Id: conicalgradient.cpp,v 1.1.1.1 2005/01/04 01:23:10 darco Exp $
   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,_("Conical Gradient"));
  57 SYNFIG_LAYER_SET_CATEGORY(ConicalGradient,_("Gradients"));
  58 SYNFIG_LAYER_SET_VERSION(ConicalGradient,"0.1");
  59 SYNFIG_LAYER_SET_CVS_ID(ConicalGradient,"$Id: conicalgradient.cpp,v 1.1.1.1 2005/01/04 01:23:10 darco Exp $");
  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_STRAIGHT),
  69         gradient(Color::black(),Color::white()),
  70         center(0,0),
  71         angle(Angle::zero()),
  72         symmetric(false)
  73 {
  74 }
  75
  76 bool
  77 ConicalGradient::set_param(const String & param, const ValueBase &value)
  78 {
  79         IMPORT(gradient);
  80         IMPORT(center);
  81         IMPORT(angle);
  82         IMPORT(symmetric);
  83         return Layer_Composite::set_param(param,value);
  84 }
  85
  86 ValueBase
  87 ConicalGradient::get_param(const String &param)const
  88 {
  89         EXPORT(gradient);
  90         EXPORT(center);
  91         EXPORT(angle);
  92         EXPORT(symmetric);
  93
  94         EXPORT_NAME();
  95         EXPORT_VERSION();
  96
  97         return Layer_Composite::get_param(param);
  98 }
  99
 100 Layer::Vocab
 101 ConicalGradient::get_param_vocab()const
 102 {
 103         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 104
 105         ret.push_back(ParamDesc("gradient")
 106                 .set_local_name(_("Gradient"))
 107         );
 108
 109         ret.push_back(ParamDesc("center")
 110                 .set_local_name(_("Center"))
 111         );
 112
 113         ret.push_back(ParamDesc("angle")
 114                 .set_local_name(_("Angle"))
 115                 .set_origin("center")
 116         );
 117
 118         ret.push_back(ParamDesc("symmetric")
 119                 .set_local_name(_("Symmetric"))
 120         );
 121
 122         return ret;
 123 }
 124
 125 inline Color
 126 ConicalGradient::color_func(const Point &pos, float supersample)const
 127 {
 128         const Point centered(pos-center);
 129         Angle::rot a=Angle::tan(-centered[1],centered[0]).mod();
 130         a+=angle;
 131         Real dist(a.mod().get());
 132
 133         dist-=floor(dist);
 134
 135         if(symmetric)
 136         {
 137                 dist*=2.0;
 138                 supersample*=2.0;
 139                 if(dist>1)dist=2.0-dist;
 140         }
 141 /*      if(dist+supersample*0.5>1.0)
 142         {
 143                 Color pool(gradient(dist,supersample*0.5)*(1.0-(dist-supersample*0.5)));
 144                 pool+=gradient((dist+supersample*0.5)-1.0,supersample*0.5)*((dist+supersample*0.5)-1.0);
 145                 if(pool.get_a() && pool.is_valid())
 146                 {
 147                         pool.set_r(pool.get_r()/pool.get_a());
 148                         pool.set_g(pool.get_g()/pool.get_a());
 149                         pool.set_b(pool.get_b()/pool.get_a());
 150                         pool.set_a(pool.get_a()/supersample);
 151                 }
 152                 return pool;
 153         }
 154
 155         if(dist-supersample*0.5<0.0)
 156         {
 157                 Color pool(gradient(dist,supersample*0.5)*(dist+supersample*0.5));
 158                 pool+=gradient(1.0-(dist-supersample*0.5),supersample*0.5)*(-(dist-supersample*0.5));
 159                 if(pool.get_a() && pool.is_valid())
 160                 {
 161                         pool.set_r(pool.get_r()/pool.get_a());
 162                         pool.set_g(pool.get_g()/pool.get_a());
 163                         pool.set_b(pool.get_b()/pool.get_a());
 164                         pool.set_a(pool.get_a()/supersample);
 165                         return pool;
 166                 }
 167         }
 168 */
 169         if(dist+supersample*0.5>1.0)
 170         {
 171                 Color pool(gradient(dist,supersample*0.5).premult_alpha()*(1.0-(dist-supersample*0.5)));
 172                 pool+=gradient((dist+supersample*0.5)-1.0,supersample*0.5).premult_alpha()*((dist+supersample*0.5)-1.0);
 173                 return pool.demult_alpha();
 174         }
 175         if(dist-supersample*0.5<0.0)
 176         {
 177                 Color pool(gradient(dist,supersample*0.5).premult_alpha()*(dist+supersample*0.5));
 178                 pool+=gradient(1.0-(dist-supersample*0.5),supersample*0.5).premult_alpha()*(-(dist-supersample*0.5));
 179                 return pool.demult_alpha();
 180         }
 181
 182         return gradient(dist,supersample);
 183 }
 184
 185 float
 186 ConicalGradient::calc_supersample(const synfig::Point &x, float pw,float ph)const
 187 {
 188         Point adj(x-center);
 189         if(abs(adj[0])<abs(pw*0.5) && abs(adj[1])<abs(ph*0.5))
 190                 return 0.5;
 191         return (pw/Point(x-center).mag())/(PI*2);
 192 }
 193
 194 synfig::Layer::Handle
 195 ConicalGradient::hit_check(synfig::Context context, const synfig::Point &point)const
 196 {
 197         if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
 198                 return const_cast<ConicalGradient*>(this);
 199         if(get_amount()==0.0)
 200                 return context.hit_check(point);
 201         if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
 202                 return const_cast<ConicalGradient*>(this);
 203         return context.hit_check(point);
 204 }
 205
 206 Color
 207 ConicalGradient::get_color(Context context, const Point &pos)const
 208 {
 209         const Color color(color_func(pos));
 210
 211         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 212                 return color;
 213         else
 214                 return Color::blend(color,context.get_color(pos),get_amount(),get_blend_method());
 215 }
 216
 217 bool
 218 ConicalGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 219 {
 220         SuperCallback supercb(cb,0,9500,10000);
 221
 222         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 223         {
 224                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 225         }
 226         else
 227         {
 228                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 229                         return false;
 230                 if(get_amount()==0)
 231                         return true;
 232         }
 233
 234
 235         int x,y;
 236
 237         Surface::pen pen(surface->begin());
 238         const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
 239         Point pos;
 240         Point tl(renddesc.get_tl());
 241         const int w(surface->get_w());
 242         const int h(surface->get_h());
 243
 244         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 245         {
 246                 if(quality<9)
 247                 {
 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)));
 251                 }
 252                 else
 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,0));
 257                 }
 258         }
 259         else
 260         {
 261                 if(quality<9)
 262                 {
 263                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 264                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 265                                         pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
 266                 }
 267                 else
 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,0),pen.get_value(),get_amount(),get_blend_method()));
 272                 }
 273         }
 274
 275         // Mark our progress as finished
 276         if(cb && !cb->amount_complete(10000,10000))
 277                 return false;
 278
 279         return true;
 280 }