synfig-core/trunk/src/modules/mod_gradient/lineargradient.cpp

   1 /*! ========================================================================
   2 ** Synfig
   3 ** Template File
   4 ** $Id: lineargradient.cpp,v 1.1.1.1 2005/01/04 01:23:10 darco Exp $
   5 **
   6 ** Copyright (c) 2002 Robert B. Quattlebaum Jr.
   7 **
   8 ** This software and associated documentation
   9 ** are CONFIDENTIAL and PROPRIETARY property of
  10 ** the above-mentioned copyright holder.
  11 **
  12 ** You may not copy, print, publish, or in any
  13 ** other way distribute this software without
  14 ** a prior written agreement with
  15 ** the copyright holder.
  16 **
  17 ** === N O T E S ===========================================================
  18 **
  19 ** ========================================================================= */
  20
  21 /* === H E A D E R S ======================================================= */
  22
  23 #ifdef USING_PCH
  24 #       include "pch.h"
  25 #else
  26 #ifdef HAVE_CONFIG_H
  27 #       include <config.h>
  28 #endif
  29
  30 #include "lineargradient.h"
  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
  41 #endif
  42
  43 /* === M A C R O S ========================================================= */
  44
  45 /* === G L O B A L S ======================================================= */
  46
  47 SYNFIG_LAYER_INIT(LinearGradient);
  48 SYNFIG_LAYER_SET_NAME(LinearGradient,"linear_gradient");
  49 SYNFIG_LAYER_SET_LOCAL_NAME(LinearGradient,_("Linear Gradient"));
  50 SYNFIG_LAYER_SET_CATEGORY(LinearGradient,_("Gradients"));
  51 SYNFIG_LAYER_SET_VERSION(LinearGradient,"0.0");
  52 SYNFIG_LAYER_SET_CVS_ID(LinearGradient,"$Id: lineargradient.cpp,v 1.1.1.1 2005/01/04 01:23:10 darco Exp $");
  53
  54 /* === P R O C E D U R E S ================================================= */
  55
  56 /* === M E T H O D S ======================================================= */
  57
  58 inline void
  59 LinearGradient::sync()
  60 {
  61         diff=(p2-p1);
  62         const Real mag(diff.inv_mag());
  63         diff*=mag*mag;
  64 }
  65
  66
  67 LinearGradient::LinearGradient():
  68         p1(1,1),
  69         p2(-1,-1),
  70         gradient(Color::black(), Color::white()),
  71         loop(false),
  72         zigzag(false)
  73 {
  74         sync();
  75 }
  76
  77 inline Color
  78 LinearGradient::color_func(const Point &point, float supersample)const
  79 {
  80         Real dist(point*diff-p1*diff);
  81
  82         if(loop)
  83                 dist-=floor(dist);
  84
  85         if(zigzag)
  86         {
  87                 dist*=2.0;
  88                 supersample*=2.0;
  89                 if(dist>1)dist=2.0-dist;
  90         }
  91
  92         if(loop)
  93         {
  94                 if(dist+supersample*0.5>1.0)
  95                 {
  96                         Color pool(gradient(dist,supersample*0.5).premult_alpha()*(1.0-(dist-supersample*0.5)));
  97                         pool+=gradient((dist+supersample*0.5)-1.0,supersample*0.5).premult_alpha()*((dist+supersample*0.5)-1.0);
  98                         return pool.demult_alpha();
  99                 }
 100                 if(dist-supersample*0.5<0.0)
 101                 {
 102                         Color pool(gradient(dist,supersample*0.5).premult_alpha()*(dist+supersample*0.5));
 103                         pool+=gradient(1.0-(dist-supersample*0.5),supersample*0.5).premult_alpha()*(-(dist-supersample*0.5));
 104                         return pool.demult_alpha();
 105                 }
 106         }
 107         return gradient(dist,supersample);
 108 }
 109
 110 float
 111 LinearGradient::calc_supersample(const synfig::Point &x, float pw,float ph)const
 112 {
 113         return pw/(p2-p1).mag();
 114 }
 115
 116 synfig::Layer::Handle
 117 LinearGradient::hit_check(synfig::Context context, const synfig::Point &point)const
 118 {
 119         if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
 120                 return const_cast<LinearGradient*>(this);
 121         if(get_amount()==0.0)
 122                 return context.hit_check(point);
 123         if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
 124                 return const_cast<LinearGradient*>(this);
 125         return context.hit_check(point);
 126 }
 127
 128 bool
 129 LinearGradient::set_param(const String & param, const ValueBase &value)
 130 {
 131         if(param=="p1" && value.same_as(p1))
 132         {
 133                 p1=value.get(p1);
 134                 sync();
 135                 return true;
 136         }
 137         if(param=="p2" && value.same_as(p2))
 138         {
 139                 p2=value.get(p2);
 140                 sync();
 141                 return true;
 142         }
 143         //IMPORT(p1);
 144         //IMPORT(p2);
 145
 146
 147         IMPORT(gradient);
 148         IMPORT(loop);
 149         IMPORT(zigzag);
 150         return Layer_Composite::set_param(param,value);
 151 }
 152
 153 ValueBase
 154 LinearGradient::get_param(const String & param)const
 155 {
 156         EXPORT(p1);
 157         EXPORT(p2);
 158         EXPORT(gradient);
 159         EXPORT(loop);
 160         EXPORT(zigzag);
 161
 162         EXPORT_NAME();
 163         EXPORT_VERSION();
 164
 165         return Layer_Composite::get_param(param);
 166 }
 167
 168 Layer::Vocab
 169 LinearGradient::get_param_vocab()const
 170 {
 171         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 172
 173         ret.push_back(ParamDesc("p1")
 174                 .set_local_name(_("Point 1"))
 175                 .set_connect("p2")
 176         );
 177         ret.push_back(ParamDesc("p2")
 178                 .set_local_name(_("Point 2"))
 179         );
 180         ret.push_back(ParamDesc("gradient")
 181                 .set_local_name(_("Gradient"))
 182         );
 183         ret.push_back(ParamDesc("loop")
 184                 .set_local_name(_("Loop"))
 185         );
 186         ret.push_back(ParamDesc("zigzag")
 187                 .set_local_name(_("ZigZag"))
 188         );
 189
 190         return ret;
 191 }
 192
 193 Color
 194 LinearGradient::get_color(Context context, const Point &point)const
 195 {
 196         const Color color(color_func(point));
 197
 198         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 199                 return color;
 200         else
 201                 return Color::blend(color,context.get_color(point),get_amount(),get_blend_method());
 202 }
 203
 204 bool
 205 LinearGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 206 {
 207         SuperCallback supercb(cb,0,9500,10000);
 208
 209         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 210         {
 211                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 212         }
 213         else
 214         {
 215                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 216                         return false;
 217                 if(get_amount()==0)
 218                         return true;
 219         }
 220
 221
 222         int x,y;
 223
 224         Surface::pen pen(surface->begin());
 225         const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
 226         Point pos;
 227         Point tl(renddesc.get_tl());
 228         const int w(surface->get_w());
 229         const int h(surface->get_h());
 230
 231         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 232         {
 233                 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 234                         for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 235                                 pen.put_value(color_func(pos,calc_supersample(pos,pw,ph)));
 236         }
 237         else
 238         {
 239                 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 240                         for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 241                                 pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
 242         }
 243
 244         // Mark our progress as finished
 245         if(cb && !cb->amount_complete(10000,10000))
 246                 return false;
 247
 248         return true;
 249 }