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#include <stdlib.h>
#include <glib.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "util.h"
#ifndef N_THREADS
#define N_THREADS 4
#endif
static void
find_image_in_wimmel(GdkPixbuf *wimmel, GdkPixbuf *match, GdkPixbuf *output)
{
int wimmel_width, wimmel_height;
int width, height;
int i, j, k, n;
int difference, barrier;
wimmel_width = gdk_pixbuf_get_width(wimmel);
wimmel_height = gdk_pixbuf_get_height(wimmel);
width = gdk_pixbuf_get_width(match);
height = gdk_pixbuf_get_height(match);
barrier = width * height / 2;
int stride = gdk_pixbuf_get_rowstride(wimmel);
int nch = gdk_pixbuf_get_n_channels(wimmel);
guchar *row = gdk_pixbuf_get_pixels(wimmel);
guchar *pix, *pix_m;
int stride_m = gdk_pixbuf_get_rowstride(match);
for (j = 0; j < wimmel_height - height; ++j, row += stride) {
for (i = 0, pix = row; i < wimmel_width - width; ++i, pix += nch) {
difference = 0;
guchar *row_m = gdk_pixbuf_get_pixels(match);
for (n = 0; n < height; ++n, row_m += stride_m) {
for (k = 0, pix_m = row_m; k < width; ++k, pix_m += nch) {
pix = row + n * stride + (i + k) * nch;
if (abs((int)pix[0] - (int)pix_m[0]) > 10) {
difference++;
if (difference > barrier)
break;
}
}
}
if (difference < barrier) {
g_print("kleeblatt @ %d, %d; difference: %d\n", i, j, difference);
color_t color = COLOR(255, 0, 0, 0);
for (k = i; k < i+width; k++) {
put_pixel(output, POINT(k, j), color);
put_pixel(output, POINT(k, j+height), color);
}
for (n = j; n < j+height; n++) {
put_pixel(output, POINT(i, n), color);
put_pixel(output, POINT(i+width, n), color);
}
}
}
}
}
struct find_params {
GdkPixbuf *wimmel;
GdkPixbuf *match;
GdkPixbuf *output;
};
static gpointer
find_thread(gpointer data)
{
struct find_params *params = data;
find_image_in_wimmel(params->wimmel, params->match, params->output);
g_object_unref(params->wimmel);
g_object_unref(params->match);
g_object_unref(params->output);
free(params);
return NULL;
}
void
monochrome(GdkPixbuf *p)
{
int x, y, width, height, nch;
guchar *d;
width = gdk_pixbuf_get_width(p);
height = gdk_pixbuf_get_height(p);
nch = gdk_pixbuf_get_n_channels(p);
for (y = 0; y < height; ++y) {
d = gdk_pixbuf_get_pixels(p) + y * gdk_pixbuf_get_rowstride(p);
for (x = 0; x < width; ++x, d += nch) {
d[0] = MAX(d[0], MAX(d[1], d[2]));
}
}
}
int
main(int argc, char *argv[])
{
char *file;
GdkPixbuf *wimmel, *output;
GdkPixbuf *match_tmp, *match;
int i;
int x1, y1, mwidth, mheight, width, height;
GThread *thread[N_THREADS];
g_type_init();
if (argc < 5)
exit(EXIT_FAILURE);
file = argv[1];
x1 = atoi(argv[2]);
y1 = atoi(argv[3]);
mwidth = atoi(argv[4]);
mheight = atoi(argv[5]);
wimmel = gdk_pixbuf_new_from_file(file, NULL);
if (!wimmel)
exit(EXIT_FAILURE);
output = gdk_pixbuf_copy(wimmel);
monochrome(wimmel);
match_tmp = gdk_pixbuf_new_subpixbuf(wimmel, x1, y1, mwidth, mheight);
match = gdk_pixbuf_copy(match_tmp);
g_object_unref(match_tmp);
monochrome(match);
width = gdk_pixbuf_get_width(wimmel);
height = gdk_pixbuf_get_height(wimmel);
int step_y = height / N_THREADS;
int y;
for (i = 0, y = 0; i < N_THREADS; ++i, y += step_y) {
struct find_params *params = malloc(sizeof (struct find_params));;
if (!params)
exit(EXIT_FAILURE);
int h = step_y + mheight;
if (y + h > height)
h = height - y;
params->wimmel = gdk_pixbuf_new_subpixbuf(wimmel, 0, y, width, h);
params->output = gdk_pixbuf_new_subpixbuf(output, 0, y, width, h);
params->match = g_object_ref(match);
thread[i] = g_thread_create(find_thread, params, TRUE, NULL);
}
for (i = 0; i < N_THREADS; ++i)
g_thread_join(thread[i]);
gdk_pixbuf_save(output, "output.tiff", "tiff", NULL, NULL);
g_object_unref(wimmel);
g_object_unref(output);
g_object_unref(match);
}
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