synfig-core/src/synfig/layer_motionblur.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file layer_motionblur.cpp
   3 **      \brief Implementation of the "Motion Blur" layer
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **      Copyright (c) 2007, 2008 Chris Moore
  10 **
  11 **      This package is free software; you can redistribute it and/or
  12 **      modify it under the terms of the GNU General Public License as
  13 **      published by the Free Software Foundation; either version 2 of
  14 **      the License, or (at your option) any later version.
  15 **
  16 **      This package is distributed in the hope that it will be useful,
  17 **      but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 **      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19 **      General Public License for more details.
  20 **      \endlegal
  21 */
  22 /* ========================================================================= */
  23
  24 /* === H E A D E R S ======================================================= */
  25
  26 #ifdef USING_PCH
  27 #       include "pch.h"
  28 #else
  29 #ifdef HAVE_CONFIG_H
  30 #       include <config.h>
  31 #endif
  32
  33 #include "string.h"
  34 #include "layer_motionblur.h"
  35 #include "time.h"
  36 #include "context.h"
  37 #include "paramdesc.h"
  38 #include "renddesc.h"
  39 #include "surface.h"
  40 #include "value.h"
  41 #include "valuenode.h"
  42 #include "canvas.h"
  43
  44 #endif
  45
  46 /* === U S I N G =========================================================== */
  47
  48 using namespace synfig;
  49 using namespace etl;
  50 using namespace std;
  51
  52 /* === G L O B A L S ======================================================= */
  53
  54 SYNFIG_LAYER_INIT(Layer_MotionBlur);
  55 SYNFIG_LAYER_SET_NAME(Layer_MotionBlur,"MotionBlur"); // todo: use motion_blur
  56 SYNFIG_LAYER_SET_LOCAL_NAME(Layer_MotionBlur,N_("Motion Blur"));
  57 SYNFIG_LAYER_SET_CATEGORY(Layer_MotionBlur,N_("Blurs"));
  58 SYNFIG_LAYER_SET_VERSION(Layer_MotionBlur,"0.1");
  59 SYNFIG_LAYER_SET_CVS_ID(Layer_MotionBlur,"$Id$");
  60
  61 /* === M E M B E R S ======================================================= */
  62
  63 Layer_MotionBlur::Layer_MotionBlur():
  64         Layer_Composite         (1.0,Color::BLEND_STRAIGHT),
  65         aperture                        (0),
  66         subsamples_factor       (1.0),
  67         subsampling_type        (SUBSAMPLING_HYPERBOLIC),
  68         subsample_start         (0.0),
  69         subsample_end           (1.0)
  70 {
  71 }
  72
  73 bool
  74 Layer_MotionBlur::set_param(const String &param, const ValueBase &value)
  75 {
  76
  77         IMPORT(aperture);
  78         IMPORT(subsamples_factor);
  79         IMPORT(subsampling_type);
  80         IMPORT(subsample_start);
  81         IMPORT(subsample_end);
  82         return Layer_Composite::set_param(param,value);
  83 }
  84
  85 ValueBase
  86 Layer_MotionBlur::get_param(const String &param)const
  87 {
  88         EXPORT(aperture);
  89         EXPORT(subsamples_factor);
  90         EXPORT(subsampling_type);
  91         EXPORT(subsample_start);
  92         EXPORT(subsample_end);
  93
  94         EXPORT_NAME();
  95         EXPORT_VERSION();
  96
  97         return Layer_Composite::get_param(param);
  98 }
  99
 100 void
 101 Layer_MotionBlur::set_time(Context context, Time time)const
 102 {
 103         context.set_time(time);
 104         time_cur=time;
 105 }
 106
 107 void
 108 Layer_MotionBlur::set_time(Context context, Time time, const Point &pos)const
 109 {
 110         context.set_time(time,pos);
 111         time_cur=time;
 112 }
 113
 114 Color
 115 Layer_MotionBlur::get_color(Context context, const Point &pos)const
 116 {
 117 /*      if(aperture)
 118         {
 119                 Time time(time_cur);
 120                 time+=(Vector::value_type)( (signed)(RAND_MAX/2)-(signed)rand() )/(Vector::value_type)(RAND_MAX) *aperture -aperture*0.5;
 121                 context.set_time(time, pos);
 122         }
 123 */
 124         return context.get_color(pos);
 125 }
 126
 127 Layer::Vocab
 128 Layer_MotionBlur::get_param_vocab()const
 129 {
 130         Layer::Vocab ret;
 131         //ret=Layer_Composite::get_param_vocab();
 132
 133         ret.push_back(ParamDesc("aperture")
 134                 .set_local_name(_("Aperture"))
 135                 .set_description(_("Shutter Time"))
 136         );
 137
 138         ret.push_back(ParamDesc("subsamples_factor")
 139                 .set_local_name(_("Subsamples Factor"))
 140                 .set_description(_("Multiplies The Number Of Subsamples Rendered"))
 141         );
 142
 143         ret.push_back(ParamDesc("subsampling_type")
 144                 .set_local_name(_("Subsampling Type"))
 145                 .set_description(_("Curve Type For Weighting Subsamples"))
 146                 .set_hint("enum")
 147                 .add_enum_value(SUBSAMPLING_CONSTANT,"constant",_("Constant"))
 148                 .add_enum_value(SUBSAMPLING_LINEAR,"linear",_("Linear"))
 149                 .add_enum_value(SUBSAMPLING_HYPERBOLIC,"hyperbolic",_("Hyperbolic"))
 150         );
 151
 152         ret.push_back(ParamDesc("subsample_start")
 153                 .set_local_name(_("Subsample Start Amount"))
 154                 .set_description(_("Relative Amount Of The First Subsample, For Linear Weighting"))
 155         );
 156
 157         ret.push_back(ParamDesc("subsample_end")
 158                 .set_local_name(_("Subsample End Amount"))
 159                 .set_description(_("Relative Amount Of The Last Subsample, For Linear Weighting"))
 160         );
 161
 162         return ret;
 163 }
 164
 165 bool
 166 Layer_MotionBlur::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 167 {
 168         if(aperture && quality<=10)
 169         {
 170                 //int x, y;
 171                 SuperCallback subimagecb;
 172                 int samples=1;
 173                 switch(quality)
 174                 {
 175                         case 1: // Production Quality
 176                                 samples=32;
 177                                 break;
 178                         case 2: // Excellent Quality
 179                                 samples=24;
 180                                 break;
 181                         case 3: // Good Quality
 182                                 samples=16;
 183                                 break;
 184                         case 4: // Moderate Quality
 185                                 samples=12;
 186                                 break;
 187                         case 5: // Draft Quality
 188                                 samples=7;
 189                                 break;
 190                         case 6:
 191                                 samples=6;
 192                                 break;
 193                         case 7:
 194                                 samples=5;
 195                                 break;
 196                         case 8:
 197                                 samples=3;
 198                                 break;
 199                         case 9:
 200                                 samples=2;
 201                                 break;
 202                         case 10: // Rough Quality
 203             default:
 204                                 samples=1;
 205                                 break;
 206
 207                 }
 208
 209                 samples *= subsamples_factor;
 210
 211                 if (samples <= 1) return context.accelerated_render(surface,quality,renddesc,cb);
 212
 213                 // Only in modes where subsample_start/end matters...
 214                 if(subsampling_type == SUBSAMPLING_LINEAR)
 215                 {
 216                         // We won't render when the scale==0, so we'll use those samples elsewhere
 217                         if(subsample_start == 0) samples++;
 218                         if(subsample_end == 0) samples++;
 219                 }
 220
 221                 Surface tmp;
 222                 int i;
 223                 float scale, divisor = 0;
 224
 225                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 226                 surface->clear();
 227
 228                 // Render subsamples from time_cur-aperture to time_cur
 229                 for(i=0;i<samples;i++)
 230                 {
 231                         float pos = i/(samples-1.0);
 232                         float ipos = 1.0-pos;
 233                         switch(subsampling_type)
 234                         {
 235                                 case SUBSAMPLING_LINEAR:
 236                                         scale = ipos*subsample_start + pos*subsample_end;
 237                                         break;
 238                                 case SUBSAMPLING_HYPERBOLIC:
 239                                         scale = 1.0/(samples-i);
 240                                         break;
 241                                 case SUBSAMPLING_CONSTANT:
 242                                 default:
 243                                         scale = 1.0; // Weights don't matter for constant overall subsampling.
 244                                         break;
 245                         }
 246                         // Don't bother rendering if scale is zero
 247                         if(scale==0)
 248                                 continue;
 249                         divisor += scale;
 250                         subimagecb=SuperCallback(cb,i*(5000/samples),(i+1)*(5000/samples),5000);
 251                         context.set_time(time_cur-aperture*ipos);
 252                         if(!context.accelerated_render(&tmp,quality,renddesc,&subimagecb))
 253                                 return false;
 254                         for(int y=0;y<renddesc.get_h();y++)
 255                                 for(int x=0;x<renddesc.get_w();x++)
 256                                         (*surface)[y][x]+=tmp[y][x].premult_alpha()*scale;
 257                 }
 258                 for(int y=0;y<renddesc.get_h();y++)
 259                         for(int x=0;x<renddesc.get_w();x++)
 260                                 (*surface)[y][x]=((*surface)[y][x]/divisor).demult_alpha();
 261         }
 262         else
 263                 return context.accelerated_render(surface,quality,renddesc,cb);
 264
 265         return true;
 266 }