synfig-core/src/modules/mod_filter/radialblur.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file radialblur.cpp
   3 **      \brief Implementation of the "Radial 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 ** === N O T E S ===========================================================
  23 **
  24 ** ========================================================================= */
  25
  26 /* === H E A D E R S ======================================================= */
  27
  28 #ifdef USING_PCH
  29 #       include "pch.h"
  30 #else
  31 #ifdef HAVE_CONFIG_H
  32 #       include <config.h>
  33 #endif
  34
  35 #include "radialblur.h"
  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 #include <synfig/transform.h>
  45 #include <ETL/misc>
  46
  47 #endif
  48
  49 /* === M A C R O S ========================================================= */
  50
  51 /* === G L O B A L S ======================================================= */
  52
  53 SYNFIG_LAYER_INIT(RadialBlur);
  54 SYNFIG_LAYER_SET_NAME(RadialBlur,"radial_blur");
  55 SYNFIG_LAYER_SET_LOCAL_NAME(RadialBlur,N_("Radial Blur"));
  56 SYNFIG_LAYER_SET_CATEGORY(RadialBlur,N_("Blurs"));
  57 SYNFIG_LAYER_SET_VERSION(RadialBlur,"0.1");
  58 SYNFIG_LAYER_SET_CVS_ID(RadialBlur,"$Id$");
  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 RadialBlur::RadialBlur():
  67         Layer_Composite(1.0,Color::BLEND_STRAIGHT),
  68         origin  (0,0),
  69         size    (0.2),
  70         fade_out(false)
  71 {
  72         Layer::Vocab voc(get_param_vocab());
  73         Layer::fill_static(voc);
  74         set_param_static("blend_method",true);
  75 }
  76
  77 RadialBlur::~RadialBlur()
  78 {
  79 }
  80
  81 bool
  82 RadialBlur::set_param(const String & param, const ValueBase &value)
  83 {
  84         IMPORT(origin);
  85         IMPORT(size);
  86         IMPORT(fade_out);
  87
  88         return Layer_Composite::set_param(param,value);
  89 }
  90
  91 ValueBase
  92 RadialBlur::get_param(const String &param)const
  93 {
  94         EXPORT(origin);
  95         EXPORT(size);
  96         EXPORT(fade_out);
  97
  98         EXPORT_NAME();
  99         EXPORT_VERSION();
 100
 101         return Layer_Composite::get_param(param);
 102 }
 103
 104 bool
 105 RadialBlur::set_param_static(const String &param, const bool x)
 106 {
 107         return Layer_Composite::set_param_static(param, x);
 108 }
 109
 110 bool
 111 RadialBlur::get_param_static(const String &param)const
 112 {
 113         return Layer_Composite::get_param_static(param);
 114 }
 115
 116 Layer::Vocab
 117 RadialBlur::get_param_vocab()const
 118 {
 119         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 120
 121         ret.push_back(ParamDesc("origin")
 122                 .set_local_name(_("Origin"))
 123                 .set_description(_("Point where you want the origin to be"))
 124         );
 125
 126         ret.push_back(ParamDesc("size")
 127                 .set_local_name(_("Size"))
 128                 .set_description(_("Size of blur"))
 129                 .set_origin("origin")
 130         );
 131
 132         ret.push_back(ParamDesc("fade_out")
 133                 .set_local_name(_("Fade Out"))
 134         );
 135
 136         return ret;
 137 }
 138
 139 Color
 140 RadialBlur::get_color(Context context, const Point &p)const
 141 {
 142         //! \writeme
 143         return context.get_color(p);
 144 }
 145
 146 bool
 147 RadialBlur::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 148 {
 149         // don't do anything at quality 10
 150         if (quality == 10)
 151                 return context.accelerated_render(surface,quality,renddesc,cb);
 152
 153         if(cb && !cb->amount_complete(0,10000))
 154                 return false;
 155
 156         Surface tmp_surface;
 157         const Point tl(renddesc.get_tl()), br(renddesc.get_br());
 158         const int w(renddesc.get_w()), h(renddesc.get_h());
 159         const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
 160
 161         Rect rect(tl, br);
 162         Point pos;
 163
 164         // find how far towards the origin of the blur we are going to
 165         // wander for each of the 4 corners of our tile, expanding the
 166         // render description for each of them if necessary
 167         int x, y;
 168         for(y=0,pos[1]=tl[1];y<h;y+=(h-1),pos[1]+=ph*(h-1))
 169                 for(x=0,pos[0]=tl[0];x<w;x+=(w-1),pos[0]+=pw*(w-1))
 170                         rect.expand((pos-origin)*(1.0f-size) + origin);
 171
 172         // round out to the nearest pixel
 173         Point tmp_surface_tl = Point(tl[0] - pw*(int((tl[0]-rect.get_min()[0])/pw+1-1e-6)),
 174                                                                  tl[1] - ph*(int((tl[1]-rect.get_max()[1])/ph+1-1e-6)));
 175         Point tmp_surface_br = Point(br[0] + pw*(int((rect.get_max()[0]-br[0])/pw+2-1e-6)),
 176                                                                  br[1] + ph*(int((rect.get_min()[1]-br[1])/ph+2-1e-6)));
 177
 178         // round to nearest integer width and height (should be very
 179         // nearly whole numbers already, but don't want to round 5.99999
 180         // down to 5)
 181         int tmp_surface_width = int((tmp_surface_br[0]-tmp_surface_tl[0])/pw + 0.5);
 182         int tmp_surface_height = int((tmp_surface_br[1]-tmp_surface_tl[1])/ph + 0.5);
 183
 184         RendDesc desc(renddesc);
 185         desc.clear_flags();
 186         desc.set_wh(tmp_surface_width,tmp_surface_height);
 187         desc.set_tl(tmp_surface_tl);
 188         desc.set_br(tmp_surface_br);
 189
 190         // render the layers beneath us
 191         if(!context.accelerated_render(&tmp_surface,quality,desc,cb))
 192                 return false;
 193
 194         // copy the part of the layers beneath us that corresponds to this tile
 195         surface->set_wh(w, h);
 196         Surface::pen pen(surface->get_pen(0, 0));
 197         tmp_surface.blit_to(pen,
 198                                                 int((tl[0] - tmp_surface_tl[0])/pw + 0.5),
 199                                                 int((tl[1] - tmp_surface_tl[1])/ph + 0.5),
 200                                                 w, h);
 201
 202         Surface::alpha_pen apen(surface->begin());
 203
 204         apen.set_alpha(get_amount());
 205         apen.set_blend_method(get_blend_method());
 206
 207 /*
 208         int steps(5);
 209
 210         if(quality>=9)steps=20;
 211         else if(quality>=5)steps=30;
 212         else if(quality>=4)steps=60;
 213         else if(quality>=3)steps=100;
 214         else steps=120;
 215 */
 216
 217         Surface::value_prep_type cooker;
 218
 219         // loop through the pixels
 220         for(y=0,pos[1]=tl[1];y<h;y++,apen.inc_y(),apen.dec_x(x),pos[1]+=ph)
 221                 for(x=0,pos[0]=tl[0];x<w;x++,apen.inc_x(),pos[0]+=pw)
 222                 {
 223                         Point
 224                                 begin(pos-tmp_surface_tl),
 225                                 end((pos-origin)*(1.0f-size) + origin-tmp_surface_tl);
 226                         begin[0]/=pw;begin[1]/=ph;
 227                         end[0]/=pw;end[1]/=ph;
 228
 229                         Color pool(Color::alpha());
 230                         int poolsize(0);
 231
 232                         int x0(round_to_int(begin[0])),
 233                                 y0(round_to_int(begin[1])),
 234                                 x1(round_to_int(end[0])),
 235                                 y1(round_to_int(end[1]));
 236
 237                         int i;
 238                         int steep = 1;
 239                         int sx, sy;  /* step positive or negative (1 or -1) */
 240                         int dx, dy;  /* delta (difference in X and Y between points) */
 241                         int e;
 242                         int w(tmp_surface_width), h(tmp_surface_height);
 243
 244                         dx = abs(x1 - x0);
 245                         sx = ((x1 - x0) > 0) ? 1 : -1;
 246                         dy = abs(y1 - y0);
 247                         sy = ((y1 - y0) > 0) ? 1 : -1;
 248                         if (dy > dx)
 249                         {
 250                                 steep = 0;
 251                                 swap(x0, y0);
 252                                 swap(dx, dy);
 253                                 swap(sx, sy);
 254                                 swap(w,h);
 255                         }
 256                         e = (dy << 1) - dx;
 257                         for (i = 0; i < dx; i++)
 258                         {
 259                                 if(y0>=0 && x0>=0 && y0<h && x0<w)
 260                                 {
 261                                         if(fade_out)
 262                                         {
 263                                                 if (steep)
 264                                                         pool+=cooker.cook(tmp_surface[y0][x0])*(i-dx);
 265                                                 else
 266                                                         pool+=cooker.cook(tmp_surface[x0][y0])*(i-dx);
 267                                                 poolsize+=(i-dx);
 268                                         }
 269                                         else
 270                                         {
 271                                                 if (steep)
 272                                                         pool+=cooker.cook(tmp_surface[y0][x0]);
 273                                                 else
 274                                                         pool+=cooker.cook(tmp_surface[x0][y0]);
 275                                                 poolsize+=1;
 276                                         }
 277                                 } else
 278                                         printf("%s:%d unexpected %d >= %d or %d >= %d?\n", __FILE__, __LINE__, x0, w, y0, h);
 279
 280                                 while (e >= 0)
 281                                 {
 282                                         y0 += sy;
 283                                         e -= (dx << 1);
 284                                 }
 285                                 x0 += sx;
 286                                 e += (dy << 1);
 287                         }
 288                         if(poolsize)
 289                         {
 290                                 pool/=poolsize;
 291                                 apen.put_value(cooker.uncook(pool));
 292                         }
 293 /*
 294                         Point begin,end;
 295                         begin=pos;
 296                         end=(pos-origin)*(1.0f-size)+origin;
 297
 298                         Color pool(Color::alpha());
 299                         float f,poolsize(0);
 300                         int i;
 301                         int steps(steps*size);
 302                         for(f=0,i=0;i<steps;i++,f+=1.0f/(steps-1))
 303                         {
 304                                 Point loc((end-begin)*f+begin-tl);
 305                                 loc[0]/=pw;loc[1]/=ph;
 306
 307                                 if(fade_out)
 308                                         pool+=tmp_surface.linear_sample(loc[0],loc[1])*(i-steps),poolsize+=(i-steps);
 309                                 else
 310                                         pool+=tmp_surface.linear_sample(loc[0],loc[1]),poolsize+=1;
 311                         }
 312                         pool/=poolsize;
 313                         apen.put_value(pool);
 314 */
 315                 }
 316
 317
 318         if(cb && !cb->amount_complete(10000,10000)) return false;
 319
 320 // #define DRAW_TILE_OUTLINES
 321 #ifdef DRAW_TILE_OUTLINES
 322         // draw red lines to show tiles
 323         {
 324                 int x, y;
 325                 if (w != 0 && h != 0) {
 326                         Surface::alpha_pen apen(surface->begin());
 327                         apen.set_alpha(get_amount());
 328                         apen.set_blend_method(get_blend_method());
 329                         apen.set_value(Color(1, 0, 0, .1));
 330                         for (x = 0; x < w; x++) { apen.put_value(); apen.inc_x(); } apen.dec_x(w);
 331                         for (y = 0; y < h; y++) { apen.put_value(); apen.inc_y(); } apen.dec_y(h);
 332                 }
 333         }
 334 #endif // DRAW_TILE_OUTLINES
 335
 336         return true;
 337 }