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 Layer::Vocab
 105 RadialBlur::get_param_vocab()const
 106 {
 107         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 108
 109         ret.push_back(ParamDesc("origin")
 110                 .set_local_name(_("Origin"))
 111                 .set_description(_("Point where you want the origin to be"))
 112         );
 113
 114         ret.push_back(ParamDesc("size")
 115                 .set_local_name(_("Size"))
 116                 .set_description(_("Size of blur"))
 117                 .set_origin("origin")
 118         );
 119
 120         ret.push_back(ParamDesc("fade_out")
 121                 .set_local_name(_("Fade Out"))
 122         );
 123
 124         return ret;
 125 }
 126
 127 Color
 128 RadialBlur::get_color(Context context, const Point &p)const
 129 {
 130         //! \writeme
 131         return context.get_color(p);
 132 }
 133
 134 bool
 135 RadialBlur::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 136 {
 137         // don't do anything at quality 10
 138         if (quality == 10)
 139                 return context.accelerated_render(surface,quality,renddesc,cb);
 140
 141         if(cb && !cb->amount_complete(0,10000))
 142                 return false;
 143
 144         Surface tmp_surface;
 145         const Point tl(renddesc.get_tl()), br(renddesc.get_br());
 146         const int w(renddesc.get_w()), h(renddesc.get_h());
 147         const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
 148
 149         Rect rect(tl, br);
 150         Point pos;
 151
 152         // find how far towards the origin of the blur we are going to
 153         // wander for each of the 4 corners of our tile, expanding the
 154         // render description for each of them if necessary
 155         int x, y;
 156         for(y=0,pos[1]=tl[1];y<h;y+=(h-1),pos[1]+=ph*(h-1))
 157                 for(x=0,pos[0]=tl[0];x<w;x+=(w-1),pos[0]+=pw*(w-1))
 158                         rect.expand((pos-origin)*(1.0f-size) + origin);
 159
 160         // round out to the nearest pixel
 161         Point tmp_surface_tl = Point(tl[0] - pw*(int((tl[0]-rect.get_min()[0])/pw+1-1e-6)),
 162                                                                  tl[1] - ph*(int((tl[1]-rect.get_max()[1])/ph+1-1e-6)));
 163         Point tmp_surface_br = Point(br[0] + pw*(int((rect.get_max()[0]-br[0])/pw+2-1e-6)),
 164                                                                  br[1] + ph*(int((rect.get_min()[1]-br[1])/ph+2-1e-6)));
 165
 166         // round to nearest integer width and height (should be very
 167         // nearly whole numbers already, but don't want to round 5.99999
 168         // down to 5)
 169         int tmp_surface_width = int((tmp_surface_br[0]-tmp_surface_tl[0])/pw + 0.5);
 170         int tmp_surface_height = int((tmp_surface_br[1]-tmp_surface_tl[1])/ph + 0.5);
 171
 172         RendDesc desc(renddesc);
 173         desc.clear_flags();
 174         desc.set_wh(tmp_surface_width,tmp_surface_height);
 175         desc.set_tl(tmp_surface_tl);
 176         desc.set_br(tmp_surface_br);
 177
 178         // render the layers beneath us
 179         if(!context.accelerated_render(&tmp_surface,quality,desc,cb))
 180                 return false;
 181
 182         // copy the part of the layers beneath us that corresponds to this tile
 183         surface->set_wh(w, h);
 184         Surface::pen pen(surface->get_pen(0, 0));
 185         tmp_surface.blit_to(pen,
 186                                                 int((tl[0] - tmp_surface_tl[0])/pw + 0.5),
 187                                                 int((tl[1] - tmp_surface_tl[1])/ph + 0.5),
 188                                                 w, h);
 189
 190         Surface::alpha_pen apen(surface->begin());
 191
 192         apen.set_alpha(get_amount());
 193         apen.set_blend_method(get_blend_method());
 194
 195 /*
 196         int steps(5);
 197
 198         if(quality>=9)steps=20;
 199         else if(quality>=5)steps=30;
 200         else if(quality>=4)steps=60;
 201         else if(quality>=3)steps=100;
 202         else steps=120;
 203 */
 204
 205         Surface::value_prep_type cooker;
 206
 207         // loop through the pixels
 208         for(y=0,pos[1]=tl[1];y<h;y++,apen.inc_y(),apen.dec_x(x),pos[1]+=ph)
 209                 for(x=0,pos[0]=tl[0];x<w;x++,apen.inc_x(),pos[0]+=pw)
 210                 {
 211                         Point
 212                                 begin(pos-tmp_surface_tl),
 213                                 end((pos-origin)*(1.0f-size) + origin-tmp_surface_tl);
 214                         begin[0]/=pw;begin[1]/=ph;
 215                         end[0]/=pw;end[1]/=ph;
 216
 217                         Color pool(Color::alpha());
 218                         int poolsize(0);
 219
 220                         int x0(round_to_int(begin[0])),
 221                                 y0(round_to_int(begin[1])),
 222                                 x1(round_to_int(end[0])),
 223                                 y1(round_to_int(end[1]));
 224
 225                         int i;
 226                         int steep = 1;
 227                         int sx, sy;  /* step positive or negative (1 or -1) */
 228                         int dx, dy;  /* delta (difference in X and Y between points) */
 229                         int e;
 230                         int w(tmp_surface_width), h(tmp_surface_height);
 231
 232                         dx = abs(x1 - x0);
 233                         sx = ((x1 - x0) > 0) ? 1 : -1;
 234                         dy = abs(y1 - y0);
 235                         sy = ((y1 - y0) > 0) ? 1 : -1;
 236                         if (dy > dx)
 237                         {
 238                                 steep = 0;
 239                                 swap(x0, y0);
 240                                 swap(dx, dy);
 241                                 swap(sx, sy);
 242                                 swap(w,h);
 243                         }
 244                         e = (dy << 1) - dx;
 245                         for (i = 0; i < dx; i++)
 246                         {
 247                                 if(y0>=0 && x0>=0 && y0<h && x0<w)
 248                                 {
 249                                         if(fade_out)
 250                                         {
 251                                                 if (steep)
 252                                                         pool+=cooker.cook(tmp_surface[y0][x0])*(i-dx);
 253                                                 else
 254                                                         pool+=cooker.cook(tmp_surface[x0][y0])*(i-dx);
 255                                                 poolsize+=(i-dx);
 256                                         }
 257                                         else
 258                                         {
 259                                                 if (steep)
 260                                                         pool+=cooker.cook(tmp_surface[y0][x0]);
 261                                                 else
 262                                                         pool+=cooker.cook(tmp_surface[x0][y0]);
 263                                                 poolsize+=1;
 264                                         }
 265                                 } else
 266                                         printf("%s:%d unexpected %d >= %d or %d >= %d?\n", __FILE__, __LINE__, x0, w, y0, h);
 267
 268                                 while (e >= 0)
 269                                 {
 270                                         y0 += sy;
 271                                         e -= (dx << 1);
 272                                 }
 273                                 x0 += sx;
 274                                 e += (dy << 1);
 275                         }
 276                         if(poolsize)
 277                         {
 278                                 pool/=poolsize;
 279                                 apen.put_value(cooker.uncook(pool));
 280                         }
 281 /*
 282                         Point begin,end;
 283                         begin=pos;
 284                         end=(pos-origin)*(1.0f-size)+origin;
 285
 286                         Color pool(Color::alpha());
 287                         float f,poolsize(0);
 288                         int i;
 289                         int steps(steps*size);
 290                         for(f=0,i=0;i<steps;i++,f+=1.0f/(steps-1))
 291                         {
 292                                 Point loc((end-begin)*f+begin-tl);
 293                                 loc[0]/=pw;loc[1]/=ph;
 294
 295                                 if(fade_out)
 296                                         pool+=tmp_surface.linear_sample(loc[0],loc[1])*(i-steps),poolsize+=(i-steps);
 297                                 else
 298                                         pool+=tmp_surface.linear_sample(loc[0],loc[1]),poolsize+=1;
 299                         }
 300                         pool/=poolsize;
 301                         apen.put_value(pool);
 302 */
 303                 }
 304
 305
 306         if(cb && !cb->amount_complete(10000,10000)) return false;
 307
 308 // #define DRAW_TILE_OUTLINES
 309 #ifdef DRAW_TILE_OUTLINES
 310         // draw red lines to show tiles
 311         {
 312                 int x, y;
 313                 if (w != 0 && h != 0) {
 314                         Surface::alpha_pen apen(surface->begin());
 315                         apen.set_alpha(get_amount());
 316                         apen.set_blend_method(get_blend_method());
 317                         apen.set_value(Color(1, 0, 0, .1));
 318                         for (x = 0; x < w; x++) { apen.put_value(); apen.inc_x(); } apen.dec_x(w);
 319                         for (y = 0; y < h; y++) { apen.put_value(); apen.inc_y(); } apen.dec_y(h);
 320                 }
 321         }
 322 #endif // DRAW_TILE_OUTLINES
 323
 324         return true;
 325 }