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/*
A test suite for dsmooth, compares dsmooth with dsmooth2
Jon Barron, 2007
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <regex.h>
#include <cairo.h>
#include <math.h>
#include "cairoutils.h"
#include "dimage.h"
#define PEAKDIST 4
int is_png(const struct dirent *de) {
regex_t preq;
regcomp(&preq, "[^ ]*[.](png|PNG)$", REG_EXTENDED);
return !regexec(&preq, de->d_name, (size_t) 0, NULL, 0);
}
int is_jpeg(const struct dirent *de) {
regex_t preq;
regcomp(&preq, "[^ ]*[.](jpg|JPG|jpeg|JPEG)$", REG_EXTENDED);
return !regexec(&preq, de->d_name, (size_t) 0, NULL, 0);
}
int is_image(const struct dirent *de) {
return is_jpeg(de) || is_png(de);
}
int is_output(const struct dirent *de) {
regex_t preq;
regcomp(&preq, "out_[^ ]*", REG_EXTENDED);
return !regexec(&preq, de->d_name, (size_t) 0, NULL, 0);
}
int is_input_image(const struct dirent *de) {
return is_image(de) && !is_output(de);
}
float* to_bw_f(unsigned char *image, int imW, int imH) {
int w, h, c;
float *image_bw;
float v;
image_bw = malloc(sizeof(float) * imW * imH);
for (w = 0; w < imW; w++) {
for (h = 0; h < imH; h++) {
v = 0.0;
for (c = 0; c <= 2; c++) {
v = v + ((float)(image[4*(w*imH+h) + c])) / 3.0;
}
image_bw[w*imH + h] = v;
}
}
return image_bw;
}
unsigned char* to_bw_u8(unsigned char *image, int imW, int imH) {
int i;
unsigned char *image_bw, *p;
image_bw = p = malloc(sizeof(unsigned char) * imW * imH);
for (i = 0; i < imW*imH; i++, image += 4, p++) {
int total = image[0] + image[1] + image[2];
*p = total / 3;
}
return image_bw;
}
unsigned char* to_cairo_bw(float *image_bw, int imW, int imH) {
int w, h, c;
unsigned char* image_cairo;
image_cairo = malloc(sizeof(unsigned char) * imW * imH * 4);
for (w = 0; w < imW; w++) {
for (h = 0; h < imH; h++) {
for (c = 0; c <= 2; c++) {
image_cairo[4*(w*imH + h) + c] = (unsigned char)(image_bw[w*imH + h]);
}
image_cairo[4*(w*imH + h) + 3] = 255;
}
}
return image_cairo;
}
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;
}
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