1 files changed, 4 insertions, 0 deletions
diff --git a/pgm.h b/pgm.h
index b8900b8..3e40034 100644
--- a/pgm.h
+++ b/pgm.h
@@ -3,12 +3,16 @@
 
 #include <stdio.h>
 #include <stdint.h>
+#include "vector.h"
 
 typedef struct {
 	uint8_t r, g, b;
 } color_t;
 
 color_t *color_set(color_t *c, uint8_t r, uint8_t g, uint8_t b);
+color_t *color_scale(color_t *dest, color_t *a, float b);
+color_t *color_add(color_t *dest, color_t *a, color_t *b);
+color_t *color_scale_vector(color_t *dest, color_t *a, vector_t *v);
 
 int pgm_write_header(FILE *fp, unsigned int w, unsigned int h);
 int pgm_write_pixel(FILE *fp, color_t *c);