#ifndef _UTIL_H_
#define _UTIL_H_

int
pgm_save(unsigned char *buf, int wrap, int xsize, int ysize, char *filename);

/* Store half of frame_a and half of frame_b in frame_a */
void
frame_mix(struct video_frame *frame_a, struct video_frame *frame_b);

#endif /* _UTIL_H_ */