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