synfig-core/trunk/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 Robert B. Quattlebaum Jr.
   9 **
  10 **      This software and associated documentation
  11 **      are CONFIDENTIAL and PROPRIETARY property of
  12 **      the above-mentioned copyright holder.
  13 **
  14 **      You may not copy, print, publish, or in any
  15 **      other way distribute this software without
  16 **      a prior written agreement with
  17 **      the copyright holder.
  18 **      \endlegal
  19 */
  20 /* ========================================================================= */
  21
  22 /* === H E A D E R S ======================================================= */
  23
  24 #ifdef USING_PCH
  25 #       include "pch.h"
  26 #else
  27 #ifdef HAVE_CONFIG_H
  28 #       include <config.h>
  29 #endif
  30
  31 #include <synfig/string.h>
  32 #include <synfig/time.h>
  33 #include <synfig/context.h>
  34 #include <synfig/paramdesc.h>
  35 #include <synfig/renddesc.h>
  36 #include <synfig/surface.h>
  37 #include <synfig/value.h>
  38 #include <synfig/valuenode.h>
  39 #include <synfig/angle.h>
  40
  41 #include "conicalgradient.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(ConicalGradient);
  54 SYNFIG_LAYER_SET_NAME(ConicalGradient,"conical_gradient");
  55 SYNFIG_LAYER_SET_LOCAL_NAME(ConicalGradient,_("Conical Gradient"));
  56 SYNFIG_LAYER_SET_CATEGORY(ConicalGradient,_("Gradients"));
  57 SYNFIG_LAYER_SET_VERSION(ConicalGradient,"0.1");
  58 SYNFIG_LAYER_SET_CVS_ID(ConicalGradient,"$Id: conicalgradient.cpp,v 1.1.1.1 2005/01/04 01:23:10 darco Exp $");
  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 ConicalGradient::ConicalGradient():
  67         Layer_Composite(1.0,Color::BLEND_STRAIGHT),
  68         gradient(Color::black(),Color::white()),
  69         center(0,0),
  70         angle(Angle::zero()),
  71         symmetric(false)
  72 {
  73 }
  74
  75 bool
  76 ConicalGradient::set_param(const String & param, const ValueBase &value)
  77 {
  78         IMPORT(gradient);
  79         IMPORT(center);
  80         IMPORT(angle);
  81         IMPORT(symmetric);
  82         return Layer_Composite::set_param(param,value);
  83 }
  84
  85 ValueBase
  86 ConicalGradient::get_param(const String &param)const
  87 {
  88         EXPORT(gradient);
  89         EXPORT(center);
  90         EXPORT(angle);
  91         EXPORT(symmetric);
  92
  93         EXPORT_NAME();
  94         EXPORT_VERSION();
  95
  96         return Layer_Composite::get_param(param);
  97 }
  98
  99 Layer::Vocab
 100 ConicalGradient::get_param_vocab()const
 101 {
 102         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 103
 104         ret.push_back(ParamDesc("gradient")
 105                 .set_local_name(_("Gradient"))
 106         );
 107
 108         ret.push_back(ParamDesc("center")
 109                 .set_local_name(_("Center"))
 110         );
 111
 112         ret.push_back(ParamDesc("angle")
 113                 .set_local_name(_("Angle"))
 114                 .set_origin("center")
 115         );
 116
 117         ret.push_back(ParamDesc("symmetric")
 118                 .set_local_name(_("Symmetric"))
 119         );
 120
 121         return ret;
 122 }
 123
 124 inline Color
 125 ConicalGradient::color_func(const Point &pos, float supersample)const
 126 {
 127         const Point centered(pos-center);
 128         Angle::rot a=Angle::tan(-centered[1],centered[0]).mod();
 129         a+=angle;
 130         Real dist(a.mod().get());
 131
 132         dist-=floor(dist);
 133
 134         if(symmetric)
 135         {
 136                 dist*=2.0;
 137                 supersample*=2.0;
 138                 if(dist>1)dist=2.0-dist;
 139         }
 140 /*      if(dist+supersample*0.5>1.0)
 141         {
 142                 Color pool(gradient(dist,supersample*0.5)*(1.0-(dist-supersample*0.5)));
 143                 pool+=gradient((dist+supersample*0.5)-1.0,supersample*0.5)*((dist+supersample*0.5)-1.0);
 144                 if(pool.get_a() && pool.is_valid())
 145                 {
 146                         pool.set_r(pool.get_r()/pool.get_a());
 147                         pool.set_g(pool.get_g()/pool.get_a());
 148                         pool.set_b(pool.get_b()/pool.get_a());
 149                         pool.set_a(pool.get_a()/supersample);
 150                 }
 151                 return pool;
 152         }
 153
 154         if(dist-supersample*0.5<0.0)
 155         {
 156                 Color pool(gradient(dist,supersample*0.5)*(dist+supersample*0.5));
 157                 pool+=gradient(1.0-(dist-supersample*0.5),supersample*0.5)*(-(dist-supersample*0.5));
 158                 if(pool.get_a() && pool.is_valid())
 159                 {
 160                         pool.set_r(pool.get_r()/pool.get_a());
 161                         pool.set_g(pool.get_g()/pool.get_a());
 162                         pool.set_b(pool.get_b()/pool.get_a());
 163                         pool.set_a(pool.get_a()/supersample);
 164                         return pool;
 165                 }
 166         }
 167 */
 168         if(dist+supersample*0.5>1.0)
 169         {
 170                 Color pool(gradient(dist,supersample*0.5).premult_alpha()*(1.0-(dist-supersample*0.5)));
 171                 pool+=gradient((dist+supersample*0.5)-1.0,supersample*0.5).premult_alpha()*((dist+supersample*0.5)-1.0);
 172                 return pool.demult_alpha();
 173         }
 174         if(dist-supersample*0.5<0.0)
 175         {
 176                 Color pool(gradient(dist,supersample*0.5).premult_alpha()*(dist+supersample*0.5));
 177                 pool+=gradient(1.0-(dist-supersample*0.5),supersample*0.5).premult_alpha()*(-(dist-supersample*0.5));
 178                 return pool.demult_alpha();
 179         }
 180
 181         return gradient(dist,supersample);
 182 }
 183
 184 float
 185 ConicalGradient::calc_supersample(const synfig::Point &x, float pw,float ph)const
 186 {
 187         Point adj(x-center);
 188         if(abs(adj[0])<abs(pw*0.5) && abs(adj[1])<abs(ph*0.5))
 189                 return 0.5;
 190         return (pw/Point(x-center).mag())/(PI*2);
 191 }
 192
 193 synfig::Layer::Handle
 194 ConicalGradient::hit_check(synfig::Context context, const synfig::Point &point)const
 195 {
 196         if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
 197                 return const_cast<ConicalGradient*>(this);
 198         if(get_amount()==0.0)
 199                 return context.hit_check(point);
 200         if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
 201                 return const_cast<ConicalGradient*>(this);
 202         return context.hit_check(point);
 203 }
 204
 205 Color
 206 ConicalGradient::get_color(Context context, const Point &pos)const
 207 {
 208         const Color color(color_func(pos));
 209
 210         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 211                 return color;
 212         else
 213                 return Color::blend(color,context.get_color(pos),get_amount(),get_blend_method());
 214 }
 215
 216 bool
 217 ConicalGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 218 {
 219         SuperCallback supercb(cb,0,9500,10000);
 220
 221         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 222         {
 223                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 224         }
 225         else
 226         {
 227                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 228                         return false;
 229                 if(get_amount()==0)
 230                         return true;
 231         }
 232
 233
 234         int x,y;
 235
 236         Surface::pen pen(surface->begin());
 237         const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
 238         Point pos;
 239         Point tl(renddesc.get_tl());
 240         const int w(surface->get_w());
 241         const int h(surface->get_h());
 242
 243         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 244         {
 245                 if(quality<9)
 246                 {
 247                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 248                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 249                                         pen.put_value(color_func(pos,calc_supersample(pos,pw,ph)));
 250                 }
 251                 else
 252                 {
 253                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 254                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 255                                         pen.put_value(color_func(pos,0));
 256                 }
 257         }
 258         else
 259         {
 260                 if(quality<9)
 261                 {
 262                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 263                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 264                                         pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
 265                 }
 266                 else
 267                 {
 268                         for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 269                                 for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 270                                         pen.put_value(Color::blend(color_func(pos,0),pen.get_value(),get_amount(),get_blend_method()));
 271                 }
 272         }
 273
 274         // Mark our progress as finished
 275         if(cb && !cb->amount_complete(10000,10000))
 276                 return false;
 277
 278         return true;
 279 }