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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ppm.h"
void save_as_ppm(char* file_path, small_t *t, size_t width, size_t height, size_t scaler)
{
FILE *fp = fopen(file_path, "wb");
if(!fp) {
fprintf(stderr, "ERROR: Could not open file: %s\n", file_path);
exit(EXIT_FAILURE);
}
if(scaler == 0) {
fprintf(stderr, "ERROR: Invalid value for scaler %ld\n", scaler);
exit(EXIT_FAILURE);
}
fprintf(fp, "P6\n%ld %ld 255\n", width*scaler, height*scaler);
for(size_t i = 0; i < height * scaler; i++)
for(size_t j = 0; j < width * scaler; j++)
{
char c = (t[(i/scaler) * width + (j/scaler)] == 0) ? 255 : 0;
for(int j = 0; j < 3; j++)
fwrite(&c, 1, 1, fp);
}
fclose(fp);
}
small_t *load_from_ppm(char *file_path, size_t *width, size_t *height)
{
FILE *fp = fopen(file_path, "rb");
if(!fp) {
fprintf(stderr, "ERROR: Could not open file: %s\n", file_path);
exit(EXIT_FAILURE);
}
char line[64] = {0};
fgets(line, sizeof(line), fp);
if(strncmp(line, "P6", 2) != 0) {
fprintf(stderr, "ERROR: PPM header is not correct of file: %s\n", file_path);
exit(EXIT_FAILURE);
}
fgets(line, sizeof(line), fp);
*width = atoi(strtok(line, " "));
*height = atoi(strtok(NULL, " "));
(void)strtok(NULL, " ");
char *pixels = malloc((*width) * (*height ) * 3);
fread(pixels, *width*3, *height, fp);
small_t *t = malloc((*width) * (*height));
for(size_t i = 0; i < *height; i++)
for(size_t j = 0; j < *width; j++)
t[i * *width + j] = (pixels[(i * *width + j) * 3] == 0) ? 1 : 0;
free(pixels);
fclose(fp);
return t;
}
void free_ppm(small_t *t)
{
free(t);
}
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