gstreamer/subprojects/gst-plugins-good/gst/goom/ifs.c

/*-
 * Copyright (c) 1997 by Massimino Pascal <Pascal.Massimon@ens.fr>
 *
 * ifs.c: modified iterated functions system for goom.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and that
 * both that copyright notice and this permission notice appear in
 * supporting documentation.
 *
 * This file is provided AS IS with no warranties of any kind.  The author
 * shall have no liability with respect to the infringement of copyrights,
 * trade secrets or any patents by this file or any part thereof.  In no
 * event will the author be liable for any lost revenue or profits or
 * other special, indirect and consequential damages.
 *
 * If this mode is weird and you have an old MetroX server, it is buggy.
 * There is a free SuSE-enhanced MetroX X server that is fine.
 *
 * When shown ifs, Diana Rose (4 years old) said, "It looks like dancing."
 *
 * Revision History:
 * 13-Dec-2003: Added some goom specific stuffs (to make ifs a VisualFX).
 * 11-Apr-2002: jeko@ios-software.com: Make ifs.c system-indendant. (ifs.h added)
 * 01-Nov-2000: Allocation checks
 * 10-May-1997: jwz@jwz.org: turned into a standalone program.
 *              Made it render into an offscreen bitmap and then copy
 *              that onto the screen, to reduce flicker.
 */

/* #ifdef STANDALONE */

#include <math.h>
#include <stdlib.h>
#include <stdio.h>

#include "goom_config.h"

#ifdef HAVE_MMX
#include "mmx.h"
#endif

#include "goom_graphic.h"
#include "ifs.h"
#include "goom_tools.h"

typedef struct _ifsPoint
{
  gint32 x, y;
}
IFSPoint;


#define MODE_ifs

#define PROGCLASS "IFS"

#define HACK_INIT init_ifs
#define HACK_DRAW draw_ifs

#define ifs_opts xlockmore_opts

#define DEFAULTS "*delay: 20000 \n" \
"*ncolors: 100 \n"

#define SMOOTH_COLORS

#define LRAND()            ((long) (goom_random(goomInfo->gRandom) & 0x7fffffff))
#define NRAND(n)           ((int) (LRAND() % (n)))

#if RAND_MAX < 0x10000
#define MAXRAND (((float)(RAND_MAX<16)+((float)RAND_MAX)+1.0f)/127.0f)
#else
#define MAXRAND            (2147483648.0/127.0) /* unsigned 1<<31 / 127.0 (cf goom_tools) as a float */
#endif

/*****************************************************/

typedef float DBL;
typedef int F_PT;

/* typedef float               F_PT; */

/*****************************************************/

#define FIX 12
#define UNIT   ( 1<<FIX )
#define MAX_SIMI  6

#define MAX_DEPTH_2  10
#define MAX_DEPTH_3  6
#define MAX_DEPTH_4  4
#define MAX_DEPTH_5  2

/* PREVIOUS VALUE 
#define MAX_SIMI  6

 * settings for a PC 120Mhz... *
#define MAX_DEPTH_2  10
#define MAX_DEPTH_3  6
#define MAX_DEPTH_4  4
#define MAX_DEPTH_5  3
*/

#define DBL_To_F_PT(x)  (F_PT)( (DBL)(UNIT)*(x) )

typedef struct Similitude_Struct SIMI;
typedef struct Fractal_Struct FRACTAL;

struct Similitude_Struct
{

  DBL c_x, c_y;
  DBL r, r2, A, A2;
  F_PT Ct, St, Ct2, St2;
  F_PT Cx, Cy;
  F_PT R, R2;
};


struct Fractal_Struct
{

  int Nb_Simi;
  SIMI Components[5 * MAX_SIMI];
  int Depth, Col;
  int Count, Speed;
  int Width, Height, Lx, Ly;
  DBL r_mean, dr_mean, dr2_mean;
  int Cur_Pt, Max_Pt;

  IFSPoint *Buffer1, *Buffer2;
};

typedef struct _IFS_DATA
{
  FRACTAL *Root;
  FRACTAL *Cur_F;

  /* Used by the Trace recursive method */
  IFSPoint *Buf;
  int Cur_Pt;
  int initalized;
} IfsData;


/*****************************************************/

static DBL
Gauss_Rand (PluginInfo * goomInfo, DBL c, DBL A, DBL S)
{
  DBL y;

  y = (DBL) LRAND () / MAXRAND;
  y = A * (1.0 - exp (-y * y * S)) / (1.0 - exp (-S));
  if (NRAND (2))
    return (c + y);
  return (c - y);
}

static DBL
Half_Gauss_Rand (PluginInfo * goomInfo, DBL c, DBL A, DBL S)
{
  DBL y;

  y = (DBL) LRAND () / MAXRAND;
  y = A * (1.0 - exp (-y * y * S)) / (1.0 - exp (-S));
  return (c + y);
}

static void
Random_Simis (PluginInfo * goomInfo, FRACTAL * F, SIMI * Cur, int i)
{
  while (i--) {
    Cur->c_x = Gauss_Rand (goomInfo, 0.0, .8, 4.0);
    Cur->c_y = Gauss_Rand (goomInfo, 0.0, .8, 4.0);
    Cur->r = Gauss_Rand (goomInfo, F->r_mean, F->dr_mean, 3.0);
    Cur->r2 = Half_Gauss_Rand (goomInfo, 0.0, F->dr2_mean, 2.0);
    Cur->A = Gauss_Rand (goomInfo, 0.0, 360.0, 4.0) * (G_PI / 180.0);
    Cur->A2 = Gauss_Rand (goomInfo, 0.0, 360.0, 4.0) * (G_PI / 180.0);
    Cur++;
  }
}

static void
free_ifs_buffers (FRACTAL * Fractal)
{
  if (Fractal->Buffer1 != NULL) {
    (void) free ((void *) Fractal->Buffer1);
    Fractal->Buffer1 = (IFSPoint *) NULL;
  }
  if (Fractal->Buffer2 != NULL) {
    (void) free ((void *) Fractal->Buffer2);
    Fractal->Buffer2 = (IFSPoint *) NULL;
  }
}


static void
free_ifs (FRACTAL * Fractal)
{
  free_ifs_buffers (Fractal);
}

/***************************************************************/

static void
init_ifs (PluginInfo * goomInfo, IfsData * data)
{
  int i;
  FRACTAL *Fractal;
  int width = goomInfo->screen.width;
  int height = goomInfo->screen.height;

  if (data->Root == NULL) {
    data->Root = (FRACTAL *) malloc (sizeof (FRACTAL));
    if (data->Root == NULL)
      return;
    data->Root->Buffer1 = (IFSPoint *) NULL;
    data->Root->Buffer2 = (IFSPoint *) NULL;
  }
  Fractal = data->Root;

  free_ifs_buffers (Fractal);

  i = (NRAND (4)) + 2;          /* Number of centers */
  switch (i) {
    case 3:
      Fractal->Depth = MAX_DEPTH_3;
      Fractal->r_mean = .6;
      Fractal->dr_mean = .4;
      Fractal->dr2_mean = .3;
      break;

    case 4:
      Fractal->Depth = MAX_DEPTH_4;
      Fractal->r_mean = .5;
      Fractal->dr_mean = .4;
      Fractal->dr2_mean = .3;
      break;

    case 5:
      Fractal->Depth = MAX_DEPTH_5;
      Fractal->r_mean = .5;
      Fractal->dr_mean = .4;
      Fractal->dr2_mean = .3;
      break;

    default:
    case 2:
      Fractal->Depth = MAX_DEPTH_2;
      Fractal->r_mean = .7;
      Fractal->dr_mean = .3;
      Fractal->dr2_mean = .4;
      break;
  }
  Fractal->Nb_Simi = i;
  Fractal->Max_Pt = Fractal->Nb_Simi - 1;
  for (i = 0; i <= Fractal->Depth + 2; ++i)
    Fractal->Max_Pt *= Fractal->Nb_Simi;

  if ((Fractal->Buffer1 = (IFSPoint *) calloc (Fractal->Max_Pt,
              sizeof (IFSPoint))) == NULL) {
    free_ifs (Fractal);
    return;
  }
  if ((Fractal->Buffer2 = (IFSPoint *) calloc (Fractal->Max_Pt,
              sizeof (IFSPoint))) == NULL) {
    free_ifs (Fractal);
    return;
  }

  Fractal->Speed = 6;
  Fractal->Width = width;       /* modif by JeKo */
  Fractal->Height = height;     /* modif by JeKo */
  Fractal->Cur_Pt = 0;
  Fractal->Count = 0;
  Fractal->Lx = (Fractal->Width - 1) / 2;
  Fractal->Ly = (Fractal->Height - 1) / 2;
  Fractal->Col = rand () % (width * height);    /* modif by JeKo */

  Random_Simis (goomInfo, Fractal, Fractal->Components, 5 * MAX_SIMI);
}


/***************************************************************/

static inline void
Transform (SIMI * Simi, F_PT xo, F_PT yo, F_PT * x, F_PT * y)
{
  F_PT xx, yy;

  xo = xo - Simi->Cx;
  xo = (xo * Simi->R) >> FIX;   /* / UNIT; */
  yo = yo - Simi->Cy;
  yo = (yo * Simi->R) >> FIX;   /* / UNIT; */

  xx = xo - Simi->Cx;
  xx = (xx * Simi->R2) >> FIX;  /* / UNIT; */
  yy = -yo - Simi->Cy;
  yy = (yy * Simi->R2) >> FIX;  /* / UNIT; */

  *x = ((xo * Simi->Ct - yo * Simi->St + xx * Simi->Ct2 - yy * Simi->St2)
      >> FIX /* / UNIT */ ) + Simi->Cx;
  *y = ((xo * Simi->St + yo * Simi->Ct + xx * Simi->St2 + yy * Simi->Ct2)
      >> FIX /* / UNIT */ ) + Simi->Cy;
}

/***************************************************************/

static void
Trace (FRACTAL * F, F_PT xo, F_PT yo, IfsData * data)
{
  F_PT x, y, i;
  SIMI *Cur;

  Cur = data->Cur_F->Components;
  for (i = data->Cur_F->Nb_Simi; i; --i, Cur++) {
    Transform (Cur, xo, yo, &x, &y);

    data->Buf->x = F->Lx + ((x * F->Lx) >> (FIX + 1) /* /(UNIT*2) */ );
    data->Buf->y = F->Ly - ((y * F->Ly) >> (FIX + 1) /* /(UNIT*2) */ );
    data->Buf++;

    data->Cur_Pt++;

    if (F->Depth && ((x - xo) >> 4) && ((y - yo) >> 4)) {
      F->Depth--;
      Trace (F, x, y, data);
      F->Depth++;
    }
  }
}

static void
Draw_Fractal (IfsData * data)
{
  FRACTAL *F = data->Root;
  int i, j;
  F_PT x, y, xo, yo;
  SIMI *Cur, *Simi;

  for (Cur = F->Components, i = F->Nb_Simi; i; --i, Cur++) {
    Cur->Cx = DBL_To_F_PT (Cur->c_x);
    Cur->Cy = DBL_To_F_PT (Cur->c_y);

    Cur->Ct = DBL_To_F_PT (cos (Cur->A));
    Cur->St = DBL_To_F_PT (sin (Cur->A));
    Cur->Ct2 = DBL_To_F_PT (cos (Cur->A2));
    Cur->St2 = DBL_To_F_PT (sin (Cur->A2));

    Cur->R = DBL_To_F_PT (Cur->r);
    Cur->R2 = DBL_To_F_PT (Cur->r2);
  }


  data->Cur_Pt = 0;
  data->Cur_F = F;
  data->Buf = F->Buffer2;
  for (Cur = F->Components, i = F->Nb_Simi; i; --i, Cur++) {
    xo = Cur->Cx;
    yo = Cur->Cy;
    for (Simi = F->Components, j = F->Nb_Simi; j; --j, Simi++) {
      if (Simi == Cur)
        continue;
      Transform (Simi, xo, yo, &x, &y);
      Trace (F, x, y, data);
    }
  }

  /* Erase previous */

  F->Cur_Pt = data->Cur_Pt;
  data->Buf = F->Buffer1;
  F->Buffer1 = F->Buffer2;
  F->Buffer2 = data->Buf;
}


static IFSPoint *
draw_ifs (PluginInfo * goomInfo, int *nbpt, IfsData * data)
{
  int i;
  DBL u, uu, v, vv, u0, u1, u2, u3;
  SIMI *S, *S1, *S2, *S3, *S4;
  FRACTAL *F;

  if (data->Root == NULL)
    return NULL;
  F = data->Root;
  if (F->Buffer1 == NULL)
    return NULL;

  u = (DBL) (F->Count) * (DBL) (F->Speed) / 1000.0;
  uu = u * u;
  v = 1.0 - u;
  vv = v * v;
  u0 = vv * v;
  u1 = 3.0 * vv * u;
  u2 = 3.0 * v * uu;
  u3 = u * uu;

  S = F->Components;
  S1 = S + F->Nb_Simi;
  S2 = S1 + F->Nb_Simi;
  S3 = S2 + F->Nb_Simi;
  S4 = S3 + F->Nb_Simi;

  for (i = F->Nb_Simi; i; --i, S++, S1++, S2++, S3++, S4++) {
    S->c_x = u0 * S1->c_x + u1 * S2->c_x + u2 * S3->c_x + u3 * S4->c_x;
    S->c_y = u0 * S1->c_y + u1 * S2->c_y + u2 * S3->c_y + u3 * S4->c_y;
    S->r = u0 * S1->r + u1 * S2->r + u2 * S3->r + u3 * S4->r;
    S->r2 = u0 * S1->r2 + u1 * S2->r2 + u2 * S3->r2 + u3 * S4->r2;
    S->A = u0 * S1->A + u1 * S2->A + u2 * S3->A + u3 * S4->A;
    S->A2 = u0 * S1->A2 + u1 * S2->A2 + u2 * S3->A2 + u3 * S4->A2;
  }

  Draw_Fractal (data);

  if (F->Count >= 1000 / F->Speed) {
    S = F->Components;
    S1 = S + F->Nb_Simi;
    S2 = S1 + F->Nb_Simi;
    S3 = S2 + F->Nb_Simi;
    S4 = S3 + F->Nb_Simi;

    for (i = F->Nb_Simi; i; --i, S++, S1++, S2++, S3++, S4++) {
      S2->c_x = 2.0 * S4->c_x - S3->c_x;
      S2->c_y = 2.0 * S4->c_y - S3->c_y;
      S2->r = 2.0 * S4->r - S3->r;
      S2->r2 = 2.0 * S4->r2 - S3->r2;
      S2->A = 2.0 * S4->A - S3->A;
      S2->A2 = 2.0 * S4->A2 - S3->A2;

      *S1 = *S4;
    }
    Random_Simis (goomInfo, F, F->Components + 3 * F->Nb_Simi, F->Nb_Simi);

    Random_Simis (goomInfo, F, F->Components + 4 * F->Nb_Simi, F->Nb_Simi);

    F->Count = 0;
  } else
    F->Count++;

  F->Col++;

  (*nbpt) = data->Cur_Pt;
  return F->Buffer2;
}


/***************************************************************/

static void
release_ifs (IfsData * data)
{
  if (data->Root != NULL) {
    free_ifs (data->Root);
    (void) free ((void *) data->Root);
    data->Root = (FRACTAL *) NULL;
  }
}

#define RAND() goom_random(goomInfo->gRandom)

static void
ifs_update (PluginInfo * goomInfo, Pixel * data, Pixel * back, int increment,
    IfsData * fx_data)
{
  static unsigned int couleur = 0xc0c0c0c0;
  static int v[4] = { 2, 4, 3, 2 };
  static int col[4] = { 2, 4, 3, 2 };

#define MOD_MER 0
#define MOD_FEU 1
#define MOD_MERVER 2
  static int mode = MOD_MERVER;
  static int justChanged = 0;
  static int cycle = 0;
  int cycle10;

  int nbpt = 0;
  IFSPoint *points;
  int i;

  unsigned int couleursl = couleur;
  int width = goomInfo->screen.width;
  int height = goomInfo->screen.height;

  cycle++;
  if (cycle >= 80)
    cycle = 0;

  if (cycle < 40)
    cycle10 = cycle / 10;
  else
    cycle10 = 7 - cycle / 10;

  {
    unsigned char *tmp = (unsigned char *) &couleursl;

    for (i = 0; i < 4; i++) {
      *tmp = (*tmp) >> cycle10;
      tmp++;
    }
  }

  points = draw_ifs (goomInfo, &nbpt, fx_data);
  nbpt--;

#ifdef HAVE_MMX
  movd_m2r (couleursl, mm1);
  punpckldq_r2r (mm1, mm1);
  for (i = 0; i < nbpt; i += increment) {
    int x = points[i].x;
    int y = points[i].y;

    if ((x < width) && (y < height) && (x > 0) && (y > 0)) {
      int pos = x + (y * width);

      movd_m2r (back[pos], mm0);
      paddusb_r2r (mm1, mm0);
      movd_r2m (mm0, data[pos]);
    }
  }
  emms ();     /*__asm__ __volatile__ ("emms");*/
#else
  for (i = 0; i < nbpt; i += increment) {
    int x = (int) points[i].x & 0x7fffffff;
    int y = (int) points[i].y & 0x7fffffff;

    if ((x < width) && (y < height)) {
      int pos = x + (int) (y * width);
      int tra = 0, i = 0;
      unsigned char *bra = (unsigned char *) &back[pos];
      unsigned char *dra = (unsigned char *) &data[pos];
      unsigned char *cra = (unsigned char *) &couleursl;

      for (; i < 4; i++) {
        tra = *cra;
        tra += *bra;
        if (tra > 255)
          tra = 255;
        *dra = tra;
        ++dra;
        ++cra;
        ++bra;
      }
    }
  }
#endif /*MMX*/
      justChanged--;

  col[ALPHA] = couleur >> (ALPHA * 8) & 0xff;
  col[BLEU] = couleur >> (BLEU * 8) & 0xff;
  col[VERT] = couleur >> (VERT * 8) & 0xff;
  col[ROUGE] = couleur >> (ROUGE * 8) & 0xff;

  if (mode == MOD_MER) {
    col[BLEU] += v[BLEU];
    if (col[BLEU] > 255) {
      col[BLEU] = 255;
      v[BLEU] = -(RAND () % 4) - 1;
    }
    if (col[BLEU] < 32) {
      col[BLEU] = 32;
      v[BLEU] = (RAND () % 4) + 1;
    }

    col[VERT] += v[VERT];
    if (col[VERT] > 200) {
      col[VERT] = 200;
      v[VERT] = -(RAND () % 3) - 2;
    }
    if (col[VERT] > col[BLEU]) {
      col[VERT] = col[BLEU];
      v[VERT] = v[BLEU];
    }
    if (col[VERT] < 32) {
      col[VERT] = 32;
      v[VERT] = (RAND () % 3) + 2;
    }

    col[ROUGE] += v[ROUGE];
    if (col[ROUGE] > 64) {
      col[ROUGE] = 64;
      v[ROUGE] = -(RAND () % 4) - 1;
    }
    if (col[ROUGE] < 0) {
      col[ROUGE] = 0;
      v[ROUGE] = (RAND () % 4) + 1;
    }

    col[ALPHA] += v[ALPHA];
    if (col[ALPHA] > 0) {
      col[ALPHA] = 0;
      v[ALPHA] = -(RAND () % 4) - 1;
    }
    if (col[ALPHA] < 0) {
      col[ALPHA] = 0;
      v[ALPHA] = (RAND () % 4) + 1;
    }

    if (((col[VERT] > 32) && (col[ROUGE] < col[VERT] + 40)
            && (col[VERT] < col[ROUGE] + 20) && (col[BLEU] < 64)
            && (RAND () % 20 == 0)) && (justChanged < 0)) {
      mode = (RAND () % 3) ? MOD_FEU : MOD_MERVER;
      justChanged = 250;
    }
  } else if (mode == MOD_MERVER) {
    col[BLEU] += v[BLEU];
    if (col[BLEU] > 128) {
      col[BLEU] = 128;
      v[BLEU] = -(RAND () % 4) - 1;
    }
    if (col[BLEU] < 16) {
      col[BLEU] = 16;
      v[BLEU] = (RAND () % 4) + 1;
    }

    col[VERT] += v[VERT];
    if (col[VERT] > 200) {
      col[VERT] = 200;
      v[VERT] = -(RAND () % 3) - 2;
    }
    if (col[VERT] > col[ALPHA]) {
      col[VERT] = col[ALPHA];
      v[VERT] = v[ALPHA];
    }
    if (col[VERT] < 32) {
      col[VERT] = 32;
      v[VERT] = (RAND () % 3) + 2;
    }

    col[ROUGE] += v[ROUGE];
    if (col[ROUGE] > 128) {
      col[ROUGE] = 128;
      v[ROUGE] = -(RAND () % 4) - 1;
    }
    if (col[ROUGE] < 0) {
      col[ROUGE] = 0;
      v[ROUGE] = (RAND () % 4) + 1;
    }

    col[ALPHA] += v[ALPHA];
    if (col[ALPHA] > 255) {
      col[ALPHA] = 255;
      v[ALPHA] = -(RAND () % 4) - 1;
    }
    if (col[ALPHA] < 0) {
      col[ALPHA] = 0;
      v[ALPHA] = (RAND () % 4) + 1;
    }

    if (((col[VERT] > 32) && (col[ROUGE] < col[VERT] + 40)
            && (col[VERT] < col[ROUGE] + 20) && (col[BLEU] < 64)
            && (RAND () % 20 == 0)) && (justChanged < 0)) {
      mode = (RAND () % 3) ? MOD_FEU : MOD_MER;
      justChanged = 250;
    }
  } else if (mode == MOD_FEU) {

    col[BLEU] += v[BLEU];
    if (col[BLEU] > 64) {
      col[BLEU] = 64;
      v[BLEU] = -(RAND () % 4) - 1;
    }
    if (col[BLEU] < 0) {
      col[BLEU] = 0;
      v[BLEU] = (RAND () % 4) + 1;
    }

    col[VERT] += v[VERT];
    if (col[VERT] > 200) {
      col[VERT] = 200;
      v[VERT] = -(RAND () % 3) - 2;
    }
    if (col[VERT] > col[ROUGE] + 20) {
      col[VERT] = col[ROUGE] + 20;
      v[VERT] = -(RAND () % 3) - 2;
      v[ROUGE] = (RAND () % 4) + 1;
      v[BLEU] = (RAND () % 4) + 1;
    }
    if (col[VERT] < 0) {
      col[VERT] = 0;
      v[VERT] = (RAND () % 3) + 2;
    }

    col[ROUGE] += v[ROUGE];
    if (col[ROUGE] > 255) {
      col[ROUGE] = 255;
      v[ROUGE] = -(RAND () % 4) - 1;
    }
    if (col[ROUGE] > col[VERT] + 40) {
      col[ROUGE] = col[VERT] + 40;
      v[ROUGE] = -(RAND () % 4) - 1;
    }
    if (col[ROUGE] < 0) {
      col[ROUGE] = 0;
      v[ROUGE] = (RAND () % 4) + 1;
    }

    col[ALPHA] += v[ALPHA];
    if (col[ALPHA] > 0) {
      col[ALPHA] = 0;
      v[ALPHA] = -(RAND () % 4) - 1;
    }
    if (col[ALPHA] < 0) {
      col[ALPHA] = 0;
      v[ALPHA] = (RAND () % 4) + 1;
    }

    if (((col[ROUGE] < 64) && (col[VERT] > 32) && (col[VERT] < col[BLEU])
            && (col[BLEU] > 32)
            && (RAND () % 20 == 0)) && (justChanged < 0)) {
      mode = (RAND () % 2) ? MOD_MER : MOD_MERVER;
      justChanged = 250;
    }
  }

  couleur = (col[ALPHA] << (ALPHA * 8))
      | (col[BLEU] << (BLEU * 8))
      | (col[VERT] << (VERT * 8))
      | (col[ROUGE] << (ROUGE * 8));
}

/* VISUAL_FX WRAPPER FOR IFS */

static void
ifs_vfx_apply (VisualFX * _this, Pixel * src, Pixel * dest,
    PluginInfo * goomInfo)
{

  IfsData *data = (IfsData *) _this->fx_data;

  if (!data->initalized) {
    data->initalized = 1;
    init_ifs (goomInfo, data);
  }
  ifs_update (goomInfo, dest, src, goomInfo->update.ifs_incr, data);
  /*TODO: trouver meilleur soluce pour increment (mettre le code de gestion de l'ifs dans ce fichier: ifs_vfx_apply) */
}

static void
ifs_vfx_init (VisualFX * _this, PluginInfo * info)
{

  IfsData *data = (IfsData *) malloc (sizeof (IfsData));

  data->Root = (FRACTAL *) NULL;
  data->initalized = 0;
  _this->fx_data = data;
}

static void
ifs_vfx_free (VisualFX * _this)
{
  IfsData *data = (IfsData *) _this->fx_data;

  release_ifs (data);
  free (data);
}

void
ifs_visualfx_create (VisualFX * vfx)
{

  vfx->init = ifs_vfx_init;
  vfx->free = ifs_vfx_free;
  vfx->apply = ifs_vfx_apply;
  vfx->fx_data = NULL;
  vfx->params = NULL;
}