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#include <stdlib.h>
#include <stdint.h>
#include <cairo.h>
#include <gtk/gtk.h>
#include <gdk/gdkpixbuf.h>
#include "fft.h"
#include "image.h"
static complex_t
filter (complex_t c, double dist)
{
double m = complex_mag (c);
double arg = complex_arg (c);
return complex_from_mag_arg (m * (1/(pow (sqrt (dist) / 128.0, 4) + 1)) , arg);
}
static void
low_pass (complex_image_t *image, double d)
{
int w = image->width;
int h = image->height;
int i, j;
double d2 = d * d;
int c = h / 2;
for (i = 0; i < h; ++i)
{
for (j = 0; j < w; ++j)
{
int idx = i * w + j;
double dist = (c - i) * (c - i) + (c - j) * (c -j);
double t;
image->red[idx] = filter (image->red[idx], dist);
image->green[idx] = filter (image->green[idx], dist);
image->blue[idx] = filter (image->blue[idx], dist);
}
}
}
int
main (int argc, char **argv)
{
char *input;
GdkPixbuf *pb;
complex_image_t *image;
g_type_init ();
if (argc < 2)
{
printf ("Usage: %s <input name>\n\n", argv[0]);
return 1;
}
input = argv[1];
if (!(pb = gdk_pixbuf_new_from_file (input, NULL)))
{
printf ("Could not open %s\n", input);
return -1;
}
image = complex_image_from_pixbuf (pb);
g_print ("width, height %d %d\n", image->width, image->height);
complex_image_fft (image);
complex_image_show ("test", image, CONVERT_MAG);
low_pass (image, 2 * image->width);
complex_image_show ("test", image, CONVERT_MAG);
complex_image_ifft (image);
complex_image_show ("test", image, CONVERT_RE);
return 0;
}
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