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/*
* Part of fractal-gen - Generate iteration-based fractals in PNM format
* Copyright (c) 2016 David Phillips <dbphillipsnz@gmail.com>
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "common.h"
void
*generate_burning_ship_section(void *section)
{
data_section *d = (data_section*)section;
struct frame *f = &(d->parent_frame);
unsigned int x,y,i;
double a,b;
double left,top;
double complex z,c;
defaultsd(&d->parent_frame.scale, 3.5f);
defaultsd(&d->parent_frame.x, -0.45f);
defaultsd(&d->parent_frame.y, -0.45f);
left = d->parent_frame.x - (d->parent_frame.scale / 2);
top = d->parent_frame.y - (d->parent_frame.scale / 2);
/* FIXME document this */
b = clust_id*(f->scale/size)+top; /* FIXME document this */
for (y = clust_id; y < size; y += clust_total) {
a = d->core*(f->scale/size)+left;
for (x = d->core; x < size; x += threads) {
z = 0;
c = a+I*b;
for (i = 0; i < iterat; i++) {
if (cabs(z) >= 2)
break;
z = cpow( fabs(creal(z)) + I*fabs(cimag(z)) , power) + c;
}
d->data[d->idx++] = (255*i)/iterat;
a += threads*(f->scale/size);
}
b += clust_total*(f->scale/size);
}
return NULL;
}
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