inline boost::optional<std::string> type_from_filename(std::string const& filename)
{
typedef boost::optional<std::string> result_type;
if (is_png(filename)) return result_type("png");
if (is_jpeg(filename)) return result_type("jpeg");
if (is_tiff(filename)) return result_type("tiff");
if (is_pdf(filename)) return result_type("pdf");
if (is_svg(filename)) return result_type("svg");
if (is_ps(filename)) return result_type("ps");
return result_type();
}
int main(void) {
struct dirent **namelist;
int i, n, N;
unsigned char *image = NULL;
float *image_bw_f;
unsigned char *image_bw_u8;
float *image_out_old;
float *image_out_new;
char fullpath[255];
char outpath_old[255];
char outpath_new[255];
int imW, imH;
float sigma;
float err;
sigma = 1.0;
N = scandir("demo_simplexy_images", &namelist, is_input_image, alphasort);
if (N < 0) {
perror("scandir");
return 1;
}
for (n = 0; n < N; n++) {
strcpy(fullpath, "demo_simplexy_images/");
strcat(fullpath, namelist[n]->d_name);
strcpy(outpath_old, "demo_simplexy_images/out_");
strcat(outpath_old, namelist[n]->d_name);
outpath_old[strlen(outpath_old)-4] = '\0';
strcat(outpath_old, "_old");
strcat(outpath_old, ".png");
strcpy(outpath_new, "demo_simplexy_images/out_");
strcat(outpath_new, namelist[n]->d_name);
outpath_new[strlen(outpath_new)-4] = '\0';
strcat(outpath_new, "_new");
strcat(outpath_new, ".png");
fprintf(stderr,"demo_dsmooth: loading %s ", fullpath);
if (is_png(namelist[n])) {
fprintf(stderr, "as a PNG\n");
image = cairoutils_read_png(fullpath, &imW, &imH);
}
if (is_jpeg(namelist[n])) {
fprintf(stderr, "as a JPEG\n");
image = cairoutils_read_jpeg(fullpath, &imW, &imH);
}
image_bw_u8 = to_bw_u8(image, imW, imH);
image_bw_f = malloc(sizeof(float) * imW * imH);
for (i = 0; i < imW*imH; i++) {
image_bw_f[i] = (float)image_bw_u8[i];
}
image_out_old = malloc(sizeof(float)*imW*imH);
image_out_new = malloc(sizeof(float)*imW*imH);
fprintf(stderr,"demo_dsmooth: running %s through dsmooth\n", fullpath);
dsmooth(image_bw_f, imW, imH, sigma, image_out_old);
fprintf(stderr,"demo_dsmooth: running %s through dsmooth2\n", fullpath);
dsmooth2(image_bw_f, imW, imH, sigma, image_out_new);
err = 0.0;
for (i = 0; i < imW*imH; i++) {
err += fabs(image_out_old[i]-image_out_new[i]);
}
err = err / (imW*imH);
fprintf(stderr, "demo_dsmooth: error between smooths: %f per pixel\n", err);
// fprintf(stderr, "demo_dsmooth: writing old dsmoothed image to %s\n", outpath_old);
// cairoutils_write_png(outpath_old, to_cairo_bw(image_out_old, imW, imH), imW, imH);
// fprintf(stderr, "demo_dsmooth: writing new dsmoothed image to %s\n", outpath_new);
// cairoutils_write_png(outpath_new, to_cairo_bw(image_out_new, imW, imH), imW, imH);
free(namelist[n]);
free(image);
free(image_bw_f);
free(image_bw_u8);
free(image_out_old);
free(image_out_new);
}
free(namelist);
return 0;
}
int is_image(const struct dirent *de) {
return is_jpeg(de) || is_png(de);
}