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#include "pgm.h"
#include <stdio.h>
#include <stdlib.h>
#define COLOR_MAX 255
int pgm_write_header(FILE *fp, unsigned int w, unsigned int h)
{
return fprintf(fp, "P3\n%d %d\n%d\n", w, h, COLOR_MAX);
}
int pgm_write_pixel(FILE *fp, color_t *c)
{
return fprintf(fp, "%.0lf %.0lf %.0lf\n", c->r * COLOR_MAX, c->g * COLOR_MAX, c->b * COLOR_MAX);
}
color_t *color_set(color_t *c, COORD_T r, COORD_T g, COORD_T b)
{
if (!c) {
c = (color_t *) malloc(sizeof(color_t));
}
c->r = r;
c->g = g;
c->b = b;
return c;
}
color_t *color_add(color_t *dest, color_t *a, color_t *b)
{
if (!dest) {
dest = (color_t *) malloc(sizeof(color_t));
}
COORD_T tmp = a->r + b->r;
dest->r = tmp > 1 ? 1 : tmp;
tmp = a->g + b->g;
dest->g = tmp > 1 ? 1 : tmp;
tmp = a->b + b->b;
dest->b = tmp > 1 ? 1 : tmp;
return dest;
}
color_t *color_scale(color_t *dest, color_t *a, COORD_T b)
{
if (!dest) {
dest = (color_t *) malloc(sizeof(color_t));
}
COORD_T tmp = a->r * b;
dest->r = tmp > 1 ? 1 : tmp;
tmp = a->g * b;
dest->g = tmp > 1 ? 1 : tmp;
tmp = a->b * b;
dest->b = tmp > 1 ? 1 : tmp;
return dest;
}
color_t *color_scale_vector(color_t *dest, color_t *a, vector_t *v)
{
if (!dest) {
dest = (color_t *) malloc(sizeof(color_t));
}
dest->r = a->r * v->x;
dest->g = a->g * v->y;
dest->b = a->b * v->z;
return dest;
}
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