synfig-core/src/modules/mod_geometry/circle.cpp

   1 /* === S Y N F I G ========================================================= */
   2 /*!     \file circle.cpp
   3 **      \brief Implementation of the "Circle" layer
   4 **
   5 **      $Id$
   6 **
   7 **      \legal
   8 **      Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
   9 **      Copyright (c) 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 "circle.h"
  34 #include <synfig/string.h>
  35 #include <synfig/time.h>
  36 #include <synfig/context.h>
  37 #include <synfig/paramdesc.h>
  38 #include <synfig/renddesc.h>
  39 #include <synfig/surface.h>
  40 #include <synfig/value.h>
  41 #include <synfig/valuenode.h>
  42
  43 #include <cmath>
  44
  45 #endif
  46
  47 using namespace synfig;
  48 using namespace std;
  49 using namespace etl;
  50
  51 /* -- G L O B A L S --------------------------------------------------------- */
  52
  53 SYNFIG_LAYER_INIT(Circle);
  54 SYNFIG_LAYER_SET_NAME(Circle,"circle");
  55 SYNFIG_LAYER_SET_LOCAL_NAME(Circle,N_("Circle"));
  56 SYNFIG_LAYER_SET_CATEGORY(Circle,N_("Geometry"));
  57 SYNFIG_LAYER_SET_VERSION(Circle,"0.1");
  58 SYNFIG_LAYER_SET_CVS_ID(Circle,"$Id$");
  59
  60 /* -- F U N C T I O N S ----------------------------------------------------- */
  61
  62 Circle::Circle():
  63         Layer_Composite (1.0,Color::BLEND_COMPOSITE),
  64         color                   (Color::black()),
  65         origin                  (0,0),
  66         radius                  (1),
  67         feather                 (0),
  68         invert                  (false),
  69         falloff                 (FALLOFF_INTERPOLATION_LINEAR)
  70 {
  71         constructcache();
  72         Layer::Vocab voc(get_param_vocab());
  73         Layer::fill_static(voc);
  74 }
  75
  76 bool
  77 Circle::ImportParameters(const String &param, const ValueBase &value)
  78 {
  79         IMPORT_PLUS(color, { if (color.get_a() == 0) { if (converted_blend_) {
  80                                         set_blend_method(Color::BLEND_ALPHA_OVER);
  81                                         color.set_a(1); } else transparent_color_ = true; } });
  82         IMPORT(radius);
  83         IMPORT_PLUS(feather, if(feather<0)feather=0;);
  84         IMPORT(invert);
  85         IMPORT(origin);
  86         IMPORT(falloff);
  87
  88         IMPORT_AS(origin,"pos");
  89
  90         return Layer_Composite::set_param(param,value);
  91 }
  92
  93 bool
  94 Circle::set_param(const String &param, const ValueBase &value)
  95 {
  96         if(ImportParameters(param,value))
  97         {
  98                 constructcache();
  99                 return true;
 100         }
 101
 102         return false;
 103 }
 104
 105 ValueBase
 106 Circle::get_param(const String &param)const
 107 {
 108         EXPORT(color);
 109         EXPORT(radius);
 110         EXPORT(feather);
 111         EXPORT(invert);
 112         EXPORT(origin);
 113         EXPORT(falloff);
 114
 115         EXPORT_NAME();
 116         EXPORT_VERSION();
 117
 118         return Layer_Composite::get_param(param);
 119 }
 120
 121 Layer::Vocab
 122 Circle::get_param_vocab()const
 123 {
 124         Layer::Vocab ret(Layer_Composite::get_param_vocab());
 125
 126         ret.push_back(ParamDesc("color")
 127                 .set_local_name(_("Color"))
 128         );
 129         ret.push_back(ParamDesc("radius")
 130                 .set_local_name(_("Radius"))
 131                 .set_origin("origin")
 132                 .set_is_distance()
 133         );
 134         ret.push_back(ParamDesc("feather")
 135                 .set_local_name(_("Feather"))
 136                 .set_is_distance()
 137         );
 138         ret.push_back(ParamDesc("origin")
 139                 .set_local_name(_("Origin"))
 140         );
 141         ret.push_back(ParamDesc("invert")
 142                 .set_local_name(_("Invert"))
 143                 .set_description(_("Invert the circle"))
 144         );
 145
 146         ret.push_back(ParamDesc("falloff")
 147                 .set_local_name(_("Falloff"))
 148                 .set_description(_("Determines the falloff function for the feather"))
 149                 .set_hint("enum")
 150                 .add_enum_value(FALLOFF_INTERPOLATION_LINEAR,"linear",_("Linear"))
 151                 .add_enum_value(FALLOFF_SQUARED,"squared",_("Squared"))
 152                 .add_enum_value(FALLOFF_SQRT,"sqrt",_("Square Root"))
 153                 .add_enum_value(FALLOFF_SIGMOND,"sigmond",_("Sigmond"))
 154                 .add_enum_value(FALLOFF_COSINE,"cosine",_("Cosine"))
 155         );
 156
 157         return ret;
 158 }
 159
 160 synfig::Layer::Handle
 161 Circle::hit_check(synfig::Context context, const synfig::Point &point)const
 162 {
 163         Point temp=origin-point;
 164
 165         if(get_amount()==0)
 166                 return context.hit_check(point);
 167
 168         bool in_circle(temp.mag_squared() <= radius*radius);
 169
 170         if(invert)
 171         {
 172                 in_circle=!in_circle;
 173                 if(in_circle && get_amount()-(feather/radius)<=0.1 && get_blend_method()!=Color::BLEND_STRAIGHT)
 174                         in_circle=false;
 175         }
 176         else
 177         {
 178                 if(get_amount()-(feather/radius)<=0.0)
 179                         in_circle=false;
 180         }
 181
 182         if(in_circle)
 183         {
 184                 synfig::Layer::Handle tmp;
 185                 if(get_blend_method()==Color::BLEND_BEHIND && (tmp=context.hit_check(point)))
 186                         return tmp;
 187                 if(Color::is_onto(get_blend_method()) && !(tmp=context.hit_check(point)))
 188                         return 0;
 189                 return const_cast<Circle*>(this);
 190         }
 191
 192         return context.hit_check(point);
 193 }
 194
 195 //falloff functions
 196 Real    Circle::SqdFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 197 {
 198         //squared proportional falloff
 199         return (c.outer_radius_sqd - mag_sqd) / c.diff_sqd;
 200 }
 201
 202 Real    Circle::InvSqdFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 203 {
 204         //squared proportional falloff
 205         return 1.0 - (c.outer_radius_sqd - mag_sqd) / c.diff_sqd;
 206 }
 207
 208
 209 Real    Circle::SqrtFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 210 {
 211         //linear distance falloff
 212         Real ret = ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 213         //then take the square root of it
 214         ret = sqrt(ret);
 215         return ret;
 216 }
 217
 218 Real    Circle::InvSqrtFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 219 {
 220         //linear distance falloff
 221         Real ret = ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 222         //then take the square root of it
 223         ret = 1.0 - sqrt(ret);
 224         return ret;
 225 }
 226
 227 Real    Circle::LinearFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 228 {
 229         //linear distance falloff
 230         return ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 231 }
 232
 233 Real    Circle::InvLinearFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 234 {
 235         return 1.0 - ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 236         //linear distance falloff
 237 }
 238
 239 Real    Circle::SigmondFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 240 {
 241         //linear distance falloff
 242         Real ret = ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 243         // inverse exponential of the linear falloff (asymptotes at 0 and 1)
 244         // \frac{1.0}{ 1 + e^{- \( a*10-5 \)}}
 245         ret = 1.0 / (1 + exp(-(ret*10-5)) );
 246         return ret;
 247 }
 248
 249 Real    Circle::InvSigmondFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 250 {
 251         //linear distance falloff
 252         Real ret = ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 253         // inverse exponential of the linear falloff (asymptotes at 0 and 1)
 254         // \frac{1.0}{ 1 + e^{- \( a*10-5 \)}}
 255         ret = 1.0 - 1.0 / (1 + exp(-(ret*10-5)) );
 256         return ret;
 257 }
 258
 259
 260 Real
 261 Circle::CosineFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 262 {
 263         //Cosine distance falloff
 264         return (1.0f-cos((( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather)*3.1415927))*0.5f;
 265 }
 266
 267 Real
 268 Circle::InvCosineFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 269 {
 270         return 1.0f-(1.0f-cos((( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather)*3.1415927))*0.5f;
 271         //Cosine distance falloff
 272 }
 273
 274 void Circle::constructcache()
 275 {
 276         cache.inner_radius = radius - feather;
 277         if(cache.inner_radius < 0)
 278                 cache.inner_radius = 0;
 279
 280         cache.outer_radius = radius + feather;
 281
 282         cache.inner_radius_sqd = cache.inner_radius > 0 ? (radius-feather)*(radius-feather) : 0;
 283         cache.outer_radius_sqd = (radius+feather)*(radius+feather);
 284
 285         cache.diff_sqd = feather*feather*4.0;
 286         cache.double_feather = feather*2.0;
 287
 288         falloff_func = GetFalloffFunc();
 289 }
 290
 291 Circle::FALLOFF_FUNC *Circle::GetFalloffFunc()const
 292 {
 293         switch(falloff)
 294         {
 295         case FALLOFF_SQUARED:   return invert?InvSqdFalloff:SqdFalloff;
 296
 297         case FALLOFF_SQRT:              return invert?InvSqrtFalloff:SqrtFalloff;
 298
 299         case FALLOFF_INTERPOLATION_LINEAR:      return invert?InvLinearFalloff:LinearFalloff;
 300
 301         case FALLOFF_SIGMOND:   return invert?InvSigmondFalloff:SigmondFalloff;
 302
 303         case FALLOFF_COSINE:
 304         default:                                return invert?InvCosineFalloff:CosineFalloff;
 305         }
 306 }
 307
 308 Color
 309 Circle::get_color(Context context, const Point &point)const
 310 {
 311         if(is_disabled() || (radius==0 && invert==false && !feather))
 312                 return context.get_color(point);
 313
 314
 315         Point temp=origin-point;
 316
 317         /*const Real inner_radius = radius-feather;
 318         const Real outer_radius = radius+feather;
 319
 320         const Real inner_radius_sqd = inner_radius > 0 ? (radius-feather)*(radius-feather) : 0;
 321         const Real outer_radius_sqd = (radius+feather)*(radius+feather);
 322
 323         const Real diff_radii_sqd = outer_radius_sqd - inner_radius_sqd;
 324         const Real double_feather = feather*2.0;*/
 325
 326         /*const Real &inner_radius = cache.inner_radius;
 327         const Real &outer_radius = cache.outer_radius;*/
 328
 329         const Real &inner_radius_sqd = cache.inner_radius_sqd;
 330         const Real &outer_radius_sqd = cache.outer_radius_sqd;
 331
 332         /*const Real &diff_radii_sqd = cache.diff_radii_sqd;
 333         const Real &double_feather = cache.double_feather;*/
 334
 335         const Vector::value_type mag_squared = temp.mag_squared();
 336
 337         //Outside the circle, with feathering enabled
 338         if( mag_squared > outer_radius_sqd )
 339         {
 340                 // inverted -> outside == colored in
 341                 if(invert)
 342                 {
 343                         if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 344                                 return color;
 345                         else
 346                                 return Color::blend(color,context.get_color(point),get_amount(),get_blend_method());
 347                 }
 348                 else
 349                         return Color::blend(Color::alpha(),context.get_color(point),get_amount(),get_blend_method());
 350         }
 351
 352         //inside the circle's solid area (with feathering)
 353         else if(mag_squared <= inner_radius_sqd)
 354         {
 355                 // !invert -> solid area
 356                 if(!invert)
 357                         if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 358                                 return color;
 359                         else
 360                                 return Color::blend(color,context.get_color(point),get_amount(),get_blend_method());
 361                 else
 362                         return Color::blend(Color::alpha(),context.get_color(point),get_amount(),get_blend_method());
 363         }
 364
 365         //If we get here, the pixel is within the feathering area, and is thus subject to falloff
 366         else
 367         {
 368                 Color::value_type alpha;
 369
 370                 /*switch(falloff)
 371                 {
 372
 373                 case FALLOFF_SQUARED:
 374                         //squared proportional falloff
 375                         alpha = (outer_radius_sqd - mag_squared) / diff_radii_sqd;
 376                         break;
 377
 378                 case FALLOFF_SQRT:
 379                         //linear distance falloff
 380                         alpha = ( outer_radius - sqrt(mag_squared) ) / double_feather;
 381                         //then take the square root of it
 382                         alpha = sqrt(alpha);
 383                         break;
 384
 385                 case FALLOFF_INTERPOLATION_LINEAR:
 386                         //linear distance falloff
 387                         alpha = ( outer_radius - sqrt(mag_squared) ) / double_feather;
 388                         break;
 389
 390                 case FALLOFF_SIGMOND:
 391                 default:
 392                         //linear distance falloff
 393                         alpha = ( outer_radius - sqrt(mag_squared) ) / double_feather;
 394                         // inverse exponential of the linear falloff (asymptotes at 0 and 1)
 395                         // \frac{1.0}{ 1 + e^{- \( a*10-5 \)}}
 396                         alpha = 1.0 / (1 + exp(-(alpha*10-5)) );
 397                         break;
 398                 }
 399
 400                 //If we're inverted, we need to invert the falloff value
 401                 if(invert)
 402                         alpha=1.0-alpha;*/
 403
 404                 alpha = falloff_func(cache,mag_squared);
 405
 406                 return Color::blend(color*alpha,context.get_color(point),get_amount(),get_blend_method());
 407         }
 408 }
 409
 410 Color NormalBlend(Color a, Color b, float amount)
 411 {
 412         return (b-a)*amount+a;
 413 }
 414
 415
 416 bool
 417 Circle::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 418 {
 419         // trivial case
 420         if(is_disabled() || (radius==0 && invert==false && !feather))
 421                 return context.accelerated_render(surface,quality, renddesc, cb);
 422
 423         // Another trivial case
 424         if(invert && radius==0 && is_solid_color())
 425         {
 426                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 427                 surface->fill(color);
 428                 if(cb && !cb->amount_complete(10000,10000))
 429                         return false;
 430                 return true;
 431         }
 432
 433         // Window Boundaries
 434         const Point     tl(renddesc.get_tl());
 435         const Point br(renddesc.get_br());
 436         const int       w(renddesc.get_w());
 437         const int       h(renddesc.get_h());
 438
 439         const Real x_neg = tl[0] > br[0] ? -1 : 1;
 440         const Real y_neg = tl[1] > br[1] ? -1 : 1;
 441
 442         // Width and Height of a pixel
 443         const Real pw = (br[0] - tl[0]) / w;
 444         const Real ph = (br[1] - tl[1]) / h;
 445
 446         // Increasing the feather amount by the size of
 447         // a pixel will create an anti-aliased appearance
 448         // don't render feathering at all when quality is 10
 449         const Real newfeather = (quality == 10) ? 0 : feather + (abs(ph)+abs(pw))/4.0;
 450
 451         //int u,v;
 452         int left =      (int)   floor( (origin[0] - x_neg*(radius+newfeather) - tl[0]) / pw );
 453         int right = (int)       ceil( (origin[0] + x_neg*(radius+newfeather) - tl[0]) / pw );
 454         int top =       (int)   floor( (origin[1] - y_neg*(radius+newfeather) - tl[1]) / ph );
 455         int bottom = (int)      ceil( (origin[1] + y_neg*(radius+newfeather) - tl[1]) / ph );
 456
 457         //clip the rectangle bounds
 458         if(left < 0)
 459                 left = 0;
 460         if(top < 0)
 461                 top = 0;
 462         if(right >= w)
 463                 right = w-1;
 464         if(bottom >= h)
 465                 bottom = h-1;
 466
 467         const Real inner_radius = radius-newfeather>0 ? radius-newfeather : 0;
 468         const Real outer_radius = radius+newfeather;
 469
 470         const Real inner_radius_sqd = inner_radius*inner_radius;
 471         const Real outer_radius_sqd = outer_radius*outer_radius;
 472
 473         const Real diff_radii_sqd = 4*newfeather*std::max(newfeather,radius);//4.0*radius*newfeather;
 474         const Real double_feather = newfeather * 2.0;
 475
 476         //Compile the temporary cache for the falloff calculations
 477         FALLOFF_FUNC *func = GetFalloffFunc();
 478
 479         const CircleDataCache cache =
 480         {
 481                 inner_radius,outer_radius,
 482                 inner_radius_sqd,outer_radius_sqd,
 483                 diff_radii_sqd,double_feather
 484         };
 485
 486         //info("Circle: Initialized everything");
 487
 488         //let the rendering begin
 489         SuperCallback supercb(cb,0,9000,10000);
 490
 491         //if it's a degenerate circle, do what we need to do, and then leave
 492         if(left >= right || top >= bottom)
 493         {
 494                 if(invert)
 495                 {
 496                         if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 497                         {
 498                                 surface->set_wh(w,h);
 499                                 surface->fill(color);
 500                                 return true;
 501                         }else
 502                         {
 503                                 // Render what is behind us
 504                                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 505                                 {
 506                                         if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 507                                         return false;
 508                                 }
 509
 510                                 Surface::alpha_pen p(surface->begin(),get_amount(),_BlendFunc(get_blend_method()));
 511
 512                                 p.set_value(color);
 513                                 p.put_block(h,w);
 514                                 return true;
 515                         }
 516                 }else
 517                 {
 518                         // Render what is behind us
 519                         if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 520                         {
 521                                 if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 522                                 return false;
 523                         }
 524                         return true;
 525                 }
 526         }
 527
 528         if( (origin[0] - tl[0])*(origin[0] - tl[0]) + (origin[1] - tl[1])*(origin[1] - tl[1]) < inner_radius_sqd
 529                 && (origin[0] - br[0])*(origin[0] - br[0]) + (origin[1] - br[1])*(origin[1] - br[1]) < inner_radius_sqd
 530                 && (origin[0] - tl[0])*(origin[0] - tl[0]) + (origin[1] - br[1])*(origin[1] - br[1]) < inner_radius_sqd
 531                 && (origin[0] - br[0])*(origin[0] - br[0]) + (origin[1] - tl[1])*(origin[1] - tl[1]) < inner_radius_sqd )
 532         {
 533                 if(invert)
 534                 {
 535                         // Render what is behind us
 536                         if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 537                         {
 538                                 if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 539                                 return false;
 540                         }
 541                 }else
 542                 {
 543                         if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 544                         {
 545                                 surface->set_wh(w,h);
 546                                 surface->fill(color);
 547                                 return true;
 548                         }
 549                 }
 550         }
 551
 552         //info("Circle: Non degenerate, rasterize %c", invert);
 553
 554         //we start in the middle of the left-top pixel
 555         Real leftf      = (left + 0.5)*pw + tl[0];
 556         Real topf       = (top + 0.5)*ph + tl[1];
 557
 558         //the looping variables
 559         Real            x,y;
 560         int                     i,j;
 561
 562         //Loop normally, since we are not inverted
 563         if(!invert)
 564         {
 565                 // Render what is behind us
 566                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 567                 {
 568                         if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 569                         return false;
 570                 }
 571
 572                 //make topf and leftf relative to the center of the circle
 573                 leftf   -=      origin[0];
 574                 topf    -=      origin[1];
 575
 576                 j = top;
 577                 y = topf;
 578
 579                 //Loop over the valid y-values in the bounding square
 580                 for(;j <= bottom; j++, y += ph)
 581                 {
 582                         i = left;
 583                         x = leftf;
 584
 585                         //for each y-value, Loop over the bounding x-values in the bounding square
 586                         for(;i <= right; i++, x += pw)
 587                         {
 588                                 //for each pixel, figure out the distance and blend
 589                                 Real    r = x*x + y*y;
 590
 591                                 //if in the inner circle then the full color shows through
 592                                 if(r <= inner_radius_sqd)
 593                                 {
 594                                         if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 595                                                 (*surface)[j][i]=color;
 596                                         else
 597                                                 (*surface)[j][i]=Color::blend(color,(*surface)[j][i],get_amount(),get_blend_method());
 598                                 }
 599                                 //if it's within the outer circle then it's in the feathering range
 600                                 else if(r <= outer_radius_sqd)
 601                                 {
 602                                         /*float myamount;
 603
 604                                         switch(falloff)
 605                                         {
 606                                         case FALLOFF_SQUARED:
 607                                                 myamount = (outer_radius_sqd - r) / diff_radii_sqd;
 608                                                 break;
 609
 610                                         case FALLOFF_SQRT:
 611                                                 myamount = (outer_radius - sqrt(r)) / double_feather;
 612                                                 myamount = sqrt(myamount);
 613                                                 break;
 614
 615                                         case FALLOFF_INTERPOLATION_LINEAR:
 616                                                 myamount = (outer_radius - sqrt(r)) / double_feather;
 617                                                 break;
 618
 619                                         case FALLOFF_SIGMOND:
 620                                         default:
 621                                                 myamount = (outer_radius - sqrt(r)) / double_feather;
 622                                                 myamount = 1.0 / ( 1 + exp(-(myamount*10 - 5)) );
 623                                                 break;
 624                                         }*/
 625
 626                                         Real    myamount = func(cache,r);
 627
 628                                         //if(myamount<0.0)myamount=0.0;
 629                                         //if(myamount>1.0)myamount=1.0;
 630                                         myamount *= get_amount();
 631                                         (*surface)[j][i] = Color::blend(color,(*surface)[j][i],myamount,get_blend_method());
 632                                 }
 633                         }
 634                 }
 635         }
 636         else
 637         {
 638                 Surface background;
 639                 RendDesc desc(renddesc);
 640                 desc.set_flags(0);
 641
 642                 int offset_x=0,offset_y=0;
 643
 644                 //fill the surface with the background color initially
 645                 surface->set_wh(w,h);
 646                 surface->fill(color);
 647
 648                 //then render the background to an alternate surface
 649                 if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 650                 {
 651                         offset_x = left;
 652                         offset_y = top;
 653
 654                         //if there is no background showing through we are done
 655                         if(right < left || bottom < top)
 656                                 return true;
 657
 658                         desc.set_subwindow(left,top,right-left+1,bottom-top+1);
 659
 660                         // Render what is behind us
 661                         if(!context.accelerated_render(&background,quality,desc,&supercb))
 662                         {
 663                                 if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 664                                 return false;
 665                         }
 666                 }
 667                 else
 668                 {
 669                         left = 0;
 670                         right = w-1;
 671                         top = 0;
 672                         bottom = h-1;
 673
 674                         leftf = /*0.5*pw +*/ tl[0];
 675                         topf = /*0.5*ph +*/ tl[1];
 676
 677                         // Render what is behind us
 678                         if(!context.accelerated_render(&background,quality,renddesc,&supercb))
 679                         {
 680                                 if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 681                                 return false;
 682                         }
 683                 }
 684
 685                 topf -= origin[1];
 686                 leftf-= origin[0];
 687
 688                 j = top;
 689                 y = topf;
 690
 691                 for(;j <= bottom; j++, y+=ph)
 692                 {
 693                         i = left;
 694                         x = leftf;
 695
 696                         for(;i <= right; i++, x+=pw)
 697                         {
 698                                 Vector::value_type r = x*x + y*y;
 699
 700                                 if(r < inner_radius_sqd)
 701                                 {
 702                                         (*surface)[j][i] = background[j-offset_y][i-offset_x];
 703                                 }
 704                                 else if(r < outer_radius_sqd)
 705                                 {
 706                                         /*float amount;
 707
 708                                         switch(falloff)
 709                                         {
 710                                         case FALLOFF_SQUARED:
 711                                                 amount = (r - inner_radius_sqd) / diff_radii_sqd;
 712                                                 break;
 713                                         case FALLOFF_INTERPOLATION_LINEAR:
 714                                                 amount = (sqrt(r) - inner_radius) / double_feather;
 715                                                 break;
 716                                         case FALLOFF_SQRT:
 717                                                 amount = (outer_radius - sqrt(r)) / double_feather;
 718                                                 amount = 1.0 - sqrt(amount);
 719                                                 break;
 720                                         case FALLOFF_SIGMOND:
 721                                         default:
 722                                                 amount = (outer_radius - sqrt(r)) / double_feather;
 723                                                 amount = 1.0 - ( 1.0/( 1 + exp(-(amount*10-5)) ) );
 724                                                 break;
 725                                         }*/
 726
 727                                         Real amount = func(cache,r);
 728
 729                                         if(amount<0.0)amount=0.0;
 730                                         if(amount>1.0)amount=1.0;
 731
 732                                         amount*=get_amount();
 733
 734                                         (*surface)[j][i]=Color::blend(color,background[j-offset_y][i-offset_x],amount,get_blend_method());
 735                                 }else if(get_amount() != 1 || get_blend_method() != Color::BLEND_STRAIGHT)
 736                                 {
 737                                         (*surface)[j][i]=Color::blend(color,background[j][i],get_amount(),get_blend_method());
 738                                 }
 739                         }
 740                 }
 741     }
 742
 743         // Mark our progress as finished
 744         if(cb && !cb->amount_complete(10000,10000))
 745                 return false;
 746
 747         return true;
 748 }
 749
 750 Rect
 751 Circle::get_bounding_rect()const
 752 {
 753         if(invert)
 754                 return Rect::full_plane();
 755
 756         Rect bounds(
 757                 origin[0]+(radius+feather),
 758                 origin[1]+(radius+feather),
 759                 origin[0]-(radius+feather),
 760                 origin[1]-(radius+feather)
 761         );
 762
 763         return bounds;
 764 }
 765
 766 Rect
 767 Circle::get_full_bounding_rect(Context context)const
 768 {
 769         if(invert)
 770         {
 771                 if(is_solid_color() && color.get_a()==0)
 772                 {
 773                         Rect bounds(
 774                                 origin[0]+(radius+feather),
 775                                 origin[1]+(radius+feather),
 776                                 origin[0]-(radius+feather),
 777                                 origin[1]-(radius+feather)
 778                         );
 779                         return bounds & context.get_full_bounding_rect();
 780                 }
 781                 return Rect::full_plane();
 782         }
 783
 784         return Layer_Composite::get_full_bounding_rect(context);
 785 }