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   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_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                 float  left(supersample*0.5-(dist-1.0));
 172                 float right(supersample*0.5+(dist-1.0));
 173                 Color pool(gradient(1.0-(left*0.5),left).premult_alpha()*left/supersample);
 174                 pool+=gradient(right*0.5,right).premult_alpha()*right/supersample;
 175                 return pool.demult_alpha();
 176         }
 177         if(dist-supersample*0.5<0.0)
 178         {
 179                 float  left(supersample*0.5-dist);
 180                 float right(supersample*0.5+dist);
 181                 Color pool(gradient(right*0.5,right).premult_alpha()*right/supersample);
 182                 pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
 183                 return pool.demult_alpha();
 184         }
 185
 186         return gradient(dist,supersample);
 187 }
 188
 189 float
 190 ConicalGradient::calc_supersample(const synfig::Point &x, float pw,float ph)const
 191 {
 192         Point adj(x-center);
 193         if(abs(adj[0])<abs(pw*0.5) && abs(adj[1])<abs(ph*0.5))
 194                 return 0.5;
 195         return (pw/Point(x-center).mag())/(PI*2);
 196 }
 197
 198 synfig::Layer::Handle
 199 ConicalGradient::hit_check(synfig::Context context, const synfig::Point &point)const
 200 {
 201         if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
 202                 return const_cast<ConicalGradient*>(this);
 203         if(get_amount()==0.0)
 204                 return context.hit_check(point);
 205         if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
 206                 return const_cast<ConicalGradient*>(this);
 207         return context.hit_check(point);
 208 }
 209
 210 Color
 211 ConicalGradient::get_color(Context context, const Point &pos)const
 212 {
 213         const Color color(color_func(pos));
 214
 215         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 216                 return color;
 217         else
 218                 return Color::blend(color,context.get_color(pos),get_amount(),get_blend_method());
 219 }
 220
 221 bool
 222 ConicalGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 223 {
 224         SuperCallback supercb(cb,0,9500,10000);
 225
 226         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 227         {
 228                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 229         }
 230         else
 231         {
 232                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 233                         return false;
 234                 if(get_amount()==0)
 235                         return true;
 236         }
 237
 238
 239         int x,y;
 240
 241         Surface::pen pen(surface->begin());
 242         const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
 243         Point pos;
 244         Point tl(renddesc.get_tl());
 245         const int w(surface->get_w());
 246         const int h(surface->get_h());
 247
 248         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 249         {
 250                 if(quality<9)
 251                 {
 252                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 253                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 254                                         pen.put_value(color_func(pos,calc_supersample(pos,pw,ph)));
 255                 }
 256                 else
 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,0));
 261                 }
 262         }
 263         else
 264         {
 265                 if(quality<9)
 266                 {
 267                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 268                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 269                                         pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
 270                 }
 271                 else
 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,0),pen.get_value(),get_amount(),get_blend_method()));
 276                 }
 277         }
 278
 279         // Mark our progress as finished
 280         if(cb && !cb->amount_complete(10000,10000))
 281                 return false;
 282
 283         return true;
 284 }