ifs.c

linux下的MPEG1

	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 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;
	IFSPoint *points;
	int     i;

	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;

      /* xine: make it darker */
      if( *tmp && !((*tmp) >> 1) )
        *tmp = 1;
      else
        *tmp = (*tmp) >> 1;

			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);
}

VisualFX ifs_visualfx_create(void) {
	VisualFX vfx = {0};
	vfx.init = ifs_vfx_init;
	vfx.free = ifs_vfx_free;
	vfx.apply = ifs_vfx_apply;
	return vfx;
}