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                 .set_description(_("Fill color of the layer"))
 129         );
 130         ret.push_back(ParamDesc("radius")
 131                 .set_local_name(_("Radius"))
 132                 .set_origin("origin")
 133                 .set_description(_("Radius of the circle"))
 134                 .set_is_distance()
 135         );
 136         ret.push_back(ParamDesc("feather")
 137                 .set_local_name(_("Feather"))
 138                 .set_is_distance()
 139                 .set_description(_("Amount of feather of the circle"))
 140         );
 141         ret.push_back(ParamDesc("origin")
 142                 .set_local_name(_("Origin"))
 143                 .set_description(_("Center of the circle"))
 144         );
 145         ret.push_back(ParamDesc("invert")
 146                 .set_local_name(_("Invert"))
 147                 .set_description(_("Invert the circle"))
 148         );
 149
 150         ret.push_back(ParamDesc("falloff")
 151                 .set_local_name(_("Falloff"))
 152                 .set_description(_("Determines the falloff function for the feather"))
 153                 .set_hint("enum")
 154                 .add_enum_value(FALLOFF_INTERPOLATION_LINEAR,"linear",_("Linear"))
 155                 .add_enum_value(FALLOFF_SQUARED,"squared",_("Squared"))
 156                 .add_enum_value(FALLOFF_SQRT,"sqrt",_("Square Root"))
 157                 .add_enum_value(FALLOFF_SIGMOND,"sigmond",_("Sigmond"))
 158                 .add_enum_value(FALLOFF_COSINE,"cosine",_("Cosine"))
 159         );
 160
 161         return ret;
 162 }
 163
 164 synfig::Layer::Handle
 165 Circle::hit_check(synfig::Context context, const synfig::Point &point)const
 166 {
 167         Point temp=origin-point;
 168
 169         if(get_amount()==0)
 170                 return context.hit_check(point);
 171
 172         bool in_circle(temp.mag_squared() <= radius*radius);
 173
 174         if(invert)
 175         {
 176                 in_circle=!in_circle;
 177                 if(in_circle && get_amount()-(feather/radius)<=0.1 && get_blend_method()!=Color::BLEND_STRAIGHT)
 178                         in_circle=false;
 179         }
 180         else
 181         {
 182                 if(get_amount()-(feather/radius)<=0.0)
 183                         in_circle=false;
 184         }
 185
 186         if(in_circle)
 187         {
 188                 synfig::Layer::Handle tmp;
 189                 if(get_blend_method()==Color::BLEND_BEHIND && (tmp=context.hit_check(point)))
 190                         return tmp;
 191                 if(Color::is_onto(get_blend_method()) && !(tmp=context.hit_check(point)))
 192                         return 0;
 193                 return const_cast<Circle*>(this);
 194         }
 195
 196         return context.hit_check(point);
 197 }
 198
 199 //falloff functions
 200 Real    Circle::SqdFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 201 {
 202         //squared proportional falloff
 203         return (c.outer_radius_sqd - mag_sqd) / c.diff_sqd;
 204 }
 205
 206 Real    Circle::InvSqdFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 207 {
 208         //squared proportional falloff
 209         return 1.0 - (c.outer_radius_sqd - mag_sqd) / c.diff_sqd;
 210 }
 211
 212
 213 Real    Circle::SqrtFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 214 {
 215         //linear distance falloff
 216         Real ret = ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 217         //then take the square root of it
 218         ret = sqrt(ret);
 219         return ret;
 220 }
 221
 222 Real    Circle::InvSqrtFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 223 {
 224         //linear distance falloff
 225         Real ret = ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 226         //then take the square root of it
 227         ret = 1.0 - sqrt(ret);
 228         return ret;
 229 }
 230
 231 Real    Circle::LinearFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 232 {
 233         //linear distance falloff
 234         return ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 235 }
 236
 237 Real    Circle::InvLinearFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 238 {
 239         return 1.0 - ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 240         //linear distance falloff
 241 }
 242
 243 Real    Circle::SigmondFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 244 {
 245         //linear distance falloff
 246         Real ret = ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 247         // inverse exponential of the linear falloff (asymptotes at 0 and 1)
 248         // \frac{1.0}{ 1 + e^{- \( a*10-5 \)}}
 249         ret = 1.0 / (1 + exp(-(ret*10-5)) );
 250         return ret;
 251 }
 252
 253 Real    Circle::InvSigmondFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 254 {
 255         //linear distance falloff
 256         Real ret = ( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather;
 257         // inverse exponential of the linear falloff (asymptotes at 0 and 1)
 258         // \frac{1.0}{ 1 + e^{- \( a*10-5 \)}}
 259         ret = 1.0 - 1.0 / (1 + exp(-(ret*10-5)) );
 260         return ret;
 261 }
 262
 263
 264 Real
 265 Circle::CosineFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 266 {
 267         //Cosine distance falloff
 268         return (1.0f-cos((( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather)*3.1415927))*0.5f;
 269 }
 270
 271 Real
 272 Circle::InvCosineFalloff(const Circle::CircleDataCache &c, const Real &mag_sqd)
 273 {
 274         return 1.0f-(1.0f-cos((( c.outer_radius - sqrt(mag_sqd) ) / c.double_feather)*3.1415927))*0.5f;
 275         //Cosine distance falloff
 276 }
 277
 278 void Circle::constructcache()
 279 {
 280         cache.inner_radius = radius - feather;
 281         if(cache.inner_radius < 0)
 282                 cache.inner_radius = 0;
 283
 284         cache.outer_radius = radius + feather;
 285
 286         cache.inner_radius_sqd = cache.inner_radius > 0 ? (radius-feather)*(radius-feather) : 0;
 287         cache.outer_radius_sqd = (radius+feather)*(radius+feather);
 288
 289         cache.diff_sqd = feather*feather*4.0;
 290         cache.double_feather = feather*2.0;
 291
 292         falloff_func = GetFalloffFunc();
 293 }
 294
 295 Circle::FALLOFF_FUNC *Circle::GetFalloffFunc()const
 296 {
 297         switch(falloff)
 298         {
 299         case FALLOFF_SQUARED:   return invert?InvSqdFalloff:SqdFalloff;
 300
 301         case FALLOFF_SQRT:              return invert?InvSqrtFalloff:SqrtFalloff;
 302
 303         case FALLOFF_INTERPOLATION_LINEAR:      return invert?InvLinearFalloff:LinearFalloff;
 304
 305         case FALLOFF_SIGMOND:   return invert?InvSigmondFalloff:SigmondFalloff;
 306
 307         case FALLOFF_COSINE:
 308         default:                                return invert?InvCosineFalloff:CosineFalloff;
 309         }
 310 }
 311
 312 Color
 313 Circle::get_color(Context context, const Point &point)const
 314 {
 315         if(is_disabled() || (radius==0 && invert==false && !feather))
 316                 return context.get_color(point);
 317
 318
 319         Point temp=origin-point;
 320
 321         /*const Real inner_radius = radius-feather;
 322         const Real outer_radius = radius+feather;
 323
 324         const Real inner_radius_sqd = inner_radius > 0 ? (radius-feather)*(radius-feather) : 0;
 325         const Real outer_radius_sqd = (radius+feather)*(radius+feather);
 326
 327         const Real diff_radii_sqd = outer_radius_sqd - inner_radius_sqd;
 328         const Real double_feather = feather*2.0;*/
 329
 330         /*const Real &inner_radius = cache.inner_radius;
 331         const Real &outer_radius = cache.outer_radius;*/
 332
 333         const Real &inner_radius_sqd = cache.inner_radius_sqd;
 334         const Real &outer_radius_sqd = cache.outer_radius_sqd;
 335
 336         /*const Real &diff_radii_sqd = cache.diff_radii_sqd;
 337         const Real &double_feather = cache.double_feather;*/
 338
 339         const Vector::value_type mag_squared = temp.mag_squared();
 340
 341         //Outside the circle, with feathering enabled
 342         if( mag_squared > outer_radius_sqd )
 343         {
 344                 // inverted -> outside == colored in
 345                 if(invert)
 346                 {
 347                         if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 348                                 return color;
 349                         else
 350                                 return Color::blend(color,context.get_color(point),get_amount(),get_blend_method());
 351                 }
 352                 else
 353                         return Color::blend(Color::alpha(),context.get_color(point),get_amount(),get_blend_method());
 354         }
 355
 356         //inside the circle's solid area (with feathering)
 357         else if(mag_squared <= inner_radius_sqd)
 358         {
 359                 // !invert -> solid area
 360                 if(!invert)
 361                         if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 362                                 return color;
 363                         else
 364                                 return Color::blend(color,context.get_color(point),get_amount(),get_blend_method());
 365                 else
 366                         return Color::blend(Color::alpha(),context.get_color(point),get_amount(),get_blend_method());
 367         }
 368
 369         //If we get here, the pixel is within the feathering area, and is thus subject to falloff
 370         else
 371         {
 372                 Color::value_type alpha;
 373
 374                 /*switch(falloff)
 375                 {
 376
 377                 case FALLOFF_SQUARED:
 378                         //squared proportional falloff
 379                         alpha = (outer_radius_sqd - mag_squared) / diff_radii_sqd;
 380                         break;
 381
 382                 case FALLOFF_SQRT:
 383                         //linear distance falloff
 384                         alpha = ( outer_radius - sqrt(mag_squared) ) / double_feather;
 385                         //then take the square root of it
 386                         alpha = sqrt(alpha);
 387                         break;
 388
 389                 case FALLOFF_INTERPOLATION_LINEAR:
 390                         //linear distance falloff
 391                         alpha = ( outer_radius - sqrt(mag_squared) ) / double_feather;
 392                         break;
 393
 394                 case FALLOFF_SIGMOND:
 395                 default:
 396                         //linear distance falloff
 397                         alpha = ( outer_radius - sqrt(mag_squared) ) / double_feather;
 398                         // inverse exponential of the linear falloff (asymptotes at 0 and 1)
 399                         // \frac{1.0}{ 1 + e^{- \( a*10-5 \)}}
 400                         alpha = 1.0 / (1 + exp(-(alpha*10-5)) );
 401                         break;
 402                 }
 403
 404                 //If we're inverted, we need to invert the falloff value
 405                 if(invert)
 406                         alpha=1.0-alpha;*/
 407
 408                 alpha = falloff_func(cache,mag_squared);
 409
 410                 return Color::blend(color*alpha,context.get_color(point),get_amount(),get_blend_method());
 411         }
 412 }
 413
 414 Color NormalBlend(Color a, Color b, float amount)
 415 {
 416         return (b-a)*amount+a;
 417 }
 418
 419
 420 bool
 421 Circle::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
 422 {
 423         // trivial case
 424         if(is_disabled() || (radius==0 && invert==false && !feather))
 425                 return context.accelerated_render(surface,quality, renddesc, cb);
 426
 427         // Another trivial case
 428         if(invert && radius==0 && is_solid_color())
 429         {
 430                 surface->set_wh(renddesc.get_w(),renddesc.get_h());
 431                 surface->fill(color);
 432                 if(cb && !cb->amount_complete(10000,10000))
 433                         return false;
 434                 return true;
 435         }
 436
 437         // Window Boundaries
 438         const Point     tl(renddesc.get_tl());
 439         const Point br(renddesc.get_br());
 440         const int       w(renddesc.get_w());
 441         const int       h(renddesc.get_h());
 442
 443         const Real x_neg = tl[0] > br[0] ? -1 : 1;
 444         const Real y_neg = tl[1] > br[1] ? -1 : 1;
 445
 446         // Width and Height of a pixel
 447         const Real pw = (br[0] - tl[0]) / w;
 448         const Real ph = (br[1] - tl[1]) / h;
 449
 450         // Increasing the feather amount by the size of
 451         // a pixel will create an anti-aliased appearance
 452         // don't render feathering at all when quality is 10
 453         const Real newfeather = (quality == 10) ? 0 : feather + (abs(ph)+abs(pw))/4.0;
 454
 455         //int u,v;
 456         int left =      (int)   floor( (origin[0] - x_neg*(radius+newfeather) - tl[0]) / pw );
 457         int right = (int)       ceil( (origin[0] + x_neg*(radius+newfeather) - tl[0]) / pw );
 458         int top =       (int)   floor( (origin[1] - y_neg*(radius+newfeather) - tl[1]) / ph );
 459         int bottom = (int)      ceil( (origin[1] + y_neg*(radius+newfeather) - tl[1]) / ph );
 460
 461         //clip the rectangle bounds
 462         if(left < 0)
 463                 left = 0;
 464         if(top < 0)
 465                 top = 0;
 466         if(right >= w)
 467                 right = w-1;
 468         if(bottom >= h)
 469                 bottom = h-1;
 470
 471         const Real inner_radius = radius-newfeather>0 ? radius-newfeather : 0;
 472         const Real outer_radius = radius+newfeather;
 473
 474         const Real inner_radius_sqd = inner_radius*inner_radius;
 475         const Real outer_radius_sqd = outer_radius*outer_radius;
 476
 477         const Real diff_radii_sqd = 4*newfeather*std::max(newfeather,radius);//4.0*radius*newfeather;
 478         const Real double_feather = newfeather * 2.0;
 479
 480         //Compile the temporary cache for the falloff calculations
 481         FALLOFF_FUNC *func = GetFalloffFunc();
 482
 483         const CircleDataCache cache =
 484         {
 485                 inner_radius,outer_radius,
 486                 inner_radius_sqd,outer_radius_sqd,
 487                 diff_radii_sqd,double_feather
 488         };
 489
 490         //info("Circle: Initialized everything");
 491
 492         //let the rendering begin
 493         SuperCallback supercb(cb,0,9000,10000);
 494
 495         //if it's a degenerate circle, do what we need to do, and then leave
 496         if(left >= right || top >= bottom)
 497         {
 498                 if(invert)
 499                 {
 500                         if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 501                         {
 502                                 surface->set_wh(w,h);
 503                                 surface->fill(color);
 504                                 return true;
 505                         }else
 506                         {
 507                                 // Render what is behind us
 508                                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 509                                 {
 510                                         if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 511                                         return false;
 512                                 }
 513
 514                                 Surface::alpha_pen p(surface->begin(),get_amount(),_BlendFunc(get_blend_method()));
 515
 516                                 p.set_value(color);
 517                                 p.put_block(h,w);
 518                                 return true;
 519                         }
 520                 }else
 521                 {
 522                         // Render what is behind us
 523                         if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 524                         {
 525                                 if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 526                                 return false;
 527                         }
 528                         return true;
 529                 }
 530         }
 531
 532         if( (origin[0] - tl[0])*(origin[0] - tl[0]) + (origin[1] - tl[1])*(origin[1] - tl[1]) < inner_radius_sqd
 533                 && (origin[0] - br[0])*(origin[0] - br[0]) + (origin[1] - br[1])*(origin[1] - br[1]) < inner_radius_sqd
 534                 && (origin[0] - tl[0])*(origin[0] - tl[0]) + (origin[1] - br[1])*(origin[1] - br[1]) < inner_radius_sqd
 535                 && (origin[0] - br[0])*(origin[0] - br[0]) + (origin[1] - tl[1])*(origin[1] - tl[1]) < inner_radius_sqd )
 536         {
 537                 if(invert)
 538                 {
 539                         // Render what is behind us
 540                         if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 541                         {
 542                                 if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 543                                 return false;
 544                         }
 545                 }else
 546                 {
 547                         if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 548                         {
 549                                 surface->set_wh(w,h);
 550                                 surface->fill(color);
 551                                 return true;
 552                         }
 553                 }
 554         }
 555
 556         //info("Circle: Non degenerate, rasterize %c", invert);
 557
 558         //we start in the middle of the left-top pixel
 559         Real leftf      = (left + 0.5)*pw + tl[0];
 560         Real topf       = (top + 0.5)*ph + tl[1];
 561
 562         //the looping variables
 563         Real            x,y;
 564         int                     i,j;
 565
 566         //Loop normally, since we are not inverted
 567         if(!invert)
 568         {
 569                 // Render what is behind us
 570                 if(!context.accelerated_render(surface,quality,renddesc,&supercb))
 571                 {
 572                         if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 573                         return false;
 574                 }
 575
 576                 //make topf and leftf relative to the center of the circle
 577                 leftf   -=      origin[0];
 578                 topf    -=      origin[1];
 579
 580                 j = top;
 581                 y = topf;
 582
 583                 //Loop over the valid y-values in the bounding square
 584                 for(;j <= bottom; j++, y += ph)
 585                 {
 586                         i = left;
 587                         x = leftf;
 588
 589                         //for each y-value, Loop over the bounding x-values in the bounding square
 590                         for(;i <= right; i++, x += pw)
 591                         {
 592                                 //for each pixel, figure out the distance and blend
 593                                 Real    r = x*x + y*y;
 594
 595                                 //if in the inner circle then the full color shows through
 596                                 if(r <= inner_radius_sqd)
 597                                 {
 598                                         if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 599                                                 (*surface)[j][i]=color;
 600                                         else
 601                                                 (*surface)[j][i]=Color::blend(color,(*surface)[j][i],get_amount(),get_blend_method());
 602                                 }
 603                                 //if it's within the outer circle then it's in the feathering range
 604                                 else if(r <= outer_radius_sqd)
 605                                 {
 606                                         /*float myamount;
 607
 608                                         switch(falloff)
 609                                         {
 610                                         case FALLOFF_SQUARED:
 611                                                 myamount = (outer_radius_sqd - r) / diff_radii_sqd;
 612                                                 break;
 613
 614                                         case FALLOFF_SQRT:
 615                                                 myamount = (outer_radius - sqrt(r)) / double_feather;
 616                                                 myamount = sqrt(myamount);
 617                                                 break;
 618
 619                                         case FALLOFF_INTERPOLATION_LINEAR:
 620                                                 myamount = (outer_radius - sqrt(r)) / double_feather;
 621                                                 break;
 622
 623                                         case FALLOFF_SIGMOND:
 624                                         default:
 625                                                 myamount = (outer_radius - sqrt(r)) / double_feather;
 626                                                 myamount = 1.0 / ( 1 + exp(-(myamount*10 - 5)) );
 627                                                 break;
 628                                         }*/
 629
 630                                         Real    myamount = func(cache,r);
 631
 632                                         //if(myamount<0.0)myamount=0.0;
 633                                         //if(myamount>1.0)myamount=1.0;
 634                                         myamount *= get_amount();
 635                                         (*surface)[j][i] = Color::blend(color,(*surface)[j][i],myamount,get_blend_method());
 636                                 }
 637                         }
 638                 }
 639         }
 640         else
 641         {
 642                 Surface background;
 643                 RendDesc desc(renddesc);
 644                 desc.set_flags(0);
 645
 646                 int offset_x=0,offset_y=0;
 647
 648                 //fill the surface with the background color initially
 649                 surface->set_wh(w,h);
 650                 surface->fill(color);
 651
 652                 //then render the background to an alternate surface
 653                 if(get_amount() == 1 && get_blend_method() == Color::BLEND_STRAIGHT)
 654                 {
 655                         offset_x = left;
 656                         offset_y = top;
 657
 658                         //if there is no background showing through we are done
 659                         if(right < left || bottom < top)
 660                                 return true;
 661
 662                         desc.set_subwindow(left,top,right-left+1,bottom-top+1);
 663
 664                         // Render what is behind us
 665                         if(!context.accelerated_render(&background,quality,desc,&supercb))
 666                         {
 667                                 if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 668                                 return false;
 669                         }
 670                 }
 671                 else
 672                 {
 673                         left = 0;
 674                         right = w-1;
 675                         top = 0;
 676                         bottom = h-1;
 677
 678                         leftf = /*0.5*pw +*/ tl[0];
 679                         topf = /*0.5*ph +*/ tl[1];
 680
 681                         // Render what is behind us
 682                         if(!context.accelerated_render(&background,quality,renddesc,&supercb))
 683                         {
 684                                 if(cb)cb->error(strprintf(__FILE__"%d: Accelerated Renderer Failure",__LINE__));
 685                                 return false;
 686                         }
 687                 }
 688
 689                 topf -= origin[1];
 690                 leftf-= origin[0];
 691
 692                 j = top;
 693                 y = topf;
 694
 695                 for(;j <= bottom; j++, y+=ph)
 696                 {
 697                         i = left;
 698                         x = leftf;
 699
 700                         for(;i <= right; i++, x+=pw)
 701                         {
 702                                 Vector::value_type r = x*x + y*y;
 703
 704                                 if(r < inner_radius_sqd)
 705                                 {
 706                                         (*surface)[j][i] = background[j-offset_y][i-offset_x];
 707                                 }
 708                                 else if(r < outer_radius_sqd)
 709                                 {
 710                                         /*float amount;
 711
 712                                         switch(falloff)
 713                                         {
 714                                         case FALLOFF_SQUARED:
 715                                                 amount = (r - inner_radius_sqd) / diff_radii_sqd;
 716                                                 break;
 717                                         case FALLOFF_INTERPOLATION_LINEAR:
 718                                                 amount = (sqrt(r) - inner_radius) / double_feather;
 719                                                 break;
 720                                         case FALLOFF_SQRT:
 721                                                 amount = (outer_radius - sqrt(r)) / double_feather;
 722                                                 amount = 1.0 - sqrt(amount);
 723                                                 break;
 724                                         case FALLOFF_SIGMOND:
 725                                         default:
 726                                                 amount = (outer_radius - sqrt(r)) / double_feather;
 727                                                 amount = 1.0 - ( 1.0/( 1 + exp(-(amount*10-5)) ) );
 728                                                 break;
 729                                         }*/
 730
 731                                         Real amount = func(cache,r);
 732
 733                                         if(amount<0.0)amount=0.0;
 734                                         if(amount>1.0)amount=1.0;
 735
 736                                         amount*=get_amount();
 737
 738                                         (*surface)[j][i]=Color::blend(color,background[j-offset_y][i-offset_x],amount,get_blend_method());
 739                                 }else if(get_amount() != 1 || get_blend_method() != Color::BLEND_STRAIGHT)
 740                                 {
 741                                         (*surface)[j][i]=Color::blend(color,background[j][i],get_amount(),get_blend_method());
 742                                 }
 743                         }
 744                 }
 745     }
 746
 747         // Mark our progress as finished
 748         if(cb && !cb->amount_complete(10000,10000))
 749                 return false;
 750
 751         return true;
 752 }
 753
 754 Rect
 755 Circle::get_bounding_rect()const
 756 {
 757         if(invert)
 758                 return Rect::full_plane();
 759
 760         Rect bounds(
 761                 origin[0]+(radius+feather),
 762                 origin[1]+(radius+feather),
 763                 origin[0]-(radius+feather),
 764                 origin[1]-(radius+feather)
 765         );
 766
 767         return bounds;
 768 }
 769
 770 Rect
 771 Circle::get_full_bounding_rect(Context context)const
 772 {
 773         if(invert)
 774         {
 775                 if(is_solid_color() && color.get_a()==0)
 776                 {
 777                         Rect bounds(
 778                                 origin[0]+(radius+feather),
 779                                 origin[1]+(radius+feather),
 780                                 origin[0]-(radius+feather),
 781                                 origin[1]-(radius+feather)
 782                         );
 783                         return bounds & context.get_full_bounding_rect();
 784                 }
 785                 return Rect::full_plane();
 786         }
 787
 788         return Layer_Composite::get_full_bounding_rect(context);
 789 }