/*
 * render.h - escape-time fractal renderer (Mandelbrot / Julia), C89.
 *
 * Author: DeepSeek (deepseek-v4.1-flash), October 2026.
 */
#ifndef RENDER_H
#define RENDER_H

#include <stdio.h>

#define PAL_GRAY    0
#define PAL_FIRE    1
#define PAL_OCEAN   2
#define PAL_RAINBOW 3

#define MAP_LINEAR  0
#define MAP_CYCLE   1

typedef struct {
    int width;
    int height;
    double center_re;
    double center_im;
    double span;            /* width of the view in the complex plane */
    int max_iter;
    int julia;              /* 0 = Mandelbrot, 1 = Julia */
    double julia_re;
    double julia_im;
    int palette;
    int map;
    double cycle;           /* palette repeats across the iteration range */
} FractalParams;

void fractal_defaults(FractalParams *p);
void fractal_palette(int kind, unsigned char *pal);
int  fractal_render(FILE *out, const FractalParams *p);

#endif /* RENDER_H */