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   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file lineargradient.cpp
   3 **      \brief Implementation of the "Linear 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 ** === N O T E S ===========================================================
  22 **
  23 ** ========================================================================= */
  24
  25 /* === H E A D E R S ======================================================= */
  26
  27 #ifdef USING_PCH
  28 #       include "pch.h"
  29 #else
  30 #ifdef HAVE_CONFIG_H
  31 #       include <config.h>
  32 #endif
  33
  34 #include "lineargradient.h"
  35
  36 #include <synfig/string.h>
  37 #include <synfig/time.h>
  38 #include <synfig/context.h>
  39 #include <synfig/paramdesc.h>
  40 #include <synfig/renddesc.h>
  41 #include <synfig/surface.h>
  42 #include <synfig/value.h>
  43 #include <synfig/valuenode.h>
  44
  45 #endif
  46
  47 /* === M A C R O S ========================================================= */
  48
  49 /* === G L O B A L S ======================================================= */
  50
  51 SYNFIG_LAYER_INIT(LinearGradient);
  52 SYNFIG_LAYER_SET_NAME(LinearGradient,"linear_gradient");
  53 SYNFIG_LAYER_SET_LOCAL_NAME(LinearGradient,N_("Linear Gradient"));
  54 SYNFIG_LAYER_SET_CATEGORY(LinearGradient,N_("Gradients"));
  55 SYNFIG_LAYER_SET_VERSION(LinearGradient,"0.0");
  56 SYNFIG_LAYER_SET_CVS_ID(LinearGradient,"$Id$");
  57
  58 /* === P R O C E D U R E S ================================================= */
  59
  60 /* === M E T H O D S ======================================================= */
  61
  62 inline void
  63 LinearGradient::sync()
  64 {
  65         diff=(p2-p1);
  66         const Real mag(diff.inv_mag());
  67         diff*=mag*mag;
  68 }
  69
  70
  71 LinearGradient::LinearGradient():
  72         p1(1,1),
  73         p2(-1,-1),
  74         gradient(Color::black(), Color::white()),
  75         loop(false),
  76         zigzag(false)
  77 {
  78         sync();
  79 }
  80
  81 inline Color
  82 LinearGradient::color_func(const Point &point, float supersample)const
  83 {
  84         Real dist(point*diff-p1*diff);
  85
  86         if(loop)
  87                 dist-=floor(dist);
  88
  89         if(zigzag)
  90         {
  91                 dist*=2.0;
  92                 supersample*=2.0;
  93                 if(dist>1)dist=2.0-dist;
  94         }
  95
  96         if(loop)
  97         {
  98                 if(dist+supersample*0.5>1.0)
  99                 {
 100                         float  left(supersample*0.5-(dist-1.0));
 101                         float right(supersample*0.5+(dist-1.0));
 102                         Color pool(gradient(1.0-(left*0.5),left).premult_alpha()*left/supersample);
 103                         if (zigzag) pool+=gradient(1.0-right*0.5,right).premult_alpha()*right/supersample;
 104                         else            pool+=gradient(right*0.5,right).premult_alpha()*right/supersample;
 105                         return pool.demult_alpha();
 106                 }
 107                 if(dist-supersample*0.5<0.0)
 108                 {
 109                         float  left(supersample*0.5-dist);
 110                         float right(supersample*0.5+dist);
 111                         Color pool(gradient(right*0.5,right).premult_alpha()*right/supersample);
 112                         if (zigzag) pool+=gradient(left*0.5,left).premult_alpha()*left/supersample;
 113                         else            pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
 114                         return pool.demult_alpha();
 115                 }
 116         }
 117         return gradient(dist,supersample);
 118 }
 119
 120 float
 121 LinearGradient::calc_supersample(const synfig::Point &/*x*/, float pw,float /*ph*/)const
 122 {
 123         return pw/(p2-p1).mag();
 124 }
 125
 126 synfig::Layer::Handle
 127 LinearGradient::hit_check(synfig::Context context, const synfig::Point &point)const
 128 {
 129         if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
 130                 return const_cast<LinearGradient*>(this);
 131         if(get_amount()==0.0)
 132                 return context.hit_check(point);
 133         if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
 134                 return const_cast<LinearGradient*>(this);
 135         return context.hit_check(point);
 136 }
 137
 138 bool
 139 LinearGradient::set_param(const String & param, const ValueBase &value)
 140 {
 141         if(param=="p1" && value.same_type_as(p1))
 142         {
 143                 p1=value.get(p1);
 144                 sync();
 145                 return true;
 146         }
 147         if(param=="p2" && value.same_type_as(p2))
 148         {
 149                 p2=value.get(p2);
 150                 sync();
 151                 return true;
 152         }
 153         //IMPORT(p1);
 154         //IMPORT(p2);
 155
 156
 157         IMPORT(gradient);
 158         IMPORT(loop);
 159         IMPORT(zigzag);
 160         return Layer_Composite::set_param(param,value);
 161 }
 162
 163 ValueBase
 164 LinearGradient::get_param(const String & param)const
 165 {
 166         EXPORT(p1);
 167         EXPORT(p2);
 168         EXPORT(gradient);
 169         EXPORT(loop);
 170         EXPORT(zigzag);
 171
 172         EXPORT_NAME();
 173         EXPORT_VERSION();
 174
 175         return Layer_Composite::get_param(param);
 176 }
 177
 178 Layer::Vocab
 179 LinearGradient::get_param_vocab()const
 180 {
 181         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 182
 183         ret.push_back(ParamDesc("p1")
 184                 .set_local_name(_("Point 1"))
 185                 .set_connect("p2")
 186         );
 187         ret.push_back(ParamDesc("p2")
 188                 .set_local_name(_("Point 2"))
 189         );
 190         ret.push_back(ParamDesc("gradient")
 191                 .set_local_name(_("Gradient"))
 192         );
 193         ret.push_back(ParamDesc("loop")
 194                 .set_local_name(_("Loop"))
 195         );
 196         ret.push_back(ParamDesc("zigzag")
 197                 .set_local_name(_("ZigZag"))
 198         );
 199
 200         return ret;
 201 }
 202
 203 Color
 204 LinearGradient::get_color(Context context, const Point &point)const
 205 {
 206         const Color color(color_func(point));
 207
 208         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 209                 return color;
 210         else
 211                 return Color::blend(color,context.get_color(point),get_amount(),get_blend_method());
 212 }
 213
 214 bool
 215 LinearGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 216 {
 217         SuperCallback supercb(cb,0,9500,10000);
 218
 219         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 220         {
 221                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 222         }
 223         else
 224         {
 225                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 226                         return false;
 227                 if(get_amount()==0)
 228                         return true;
 229         }
 230
 231
 232         int x,y;
 233
 234         Surface::pen pen(surface->begin());
 235         const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
 236         Point pos;
 237         Point tl(renddesc.get_tl());
 238         const int w(surface->get_w());
 239         const int h(surface->get_h());
 240
 241         if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
 242         {
 243                 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 244                         for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 245                                 pen.put_value(color_func(pos,calc_supersample(pos,pw,ph)));
 246         }
 247         else
 248         {
 249                 for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
 250                         for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
 251                                 pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
 252         }
 253
 254         // Mark our progress as finished
 255         if(cb && !cb->amount_complete(10000,10000))
 256                 return false;
 257
 258         return true;
 259 }