#include "util.h"

void lock(SDL_Surface *screen) { if ( SDL_MUSTLOCK(screen) && SDL_LockSurface(screen) < 0 ) return; }

void unlock(SDL_Surface *screen) { if ( SDL_MUSTLOCK(screen) ) SDL_UnlockSurface(screen); }

void initRand() { srand(time(NULL)); }

unsigned int randInt(unsigned int range) { return (unsigned int) (((double)range)*rand()/(RAND_MAX+1.0)); }

int clamp(int val, int min, int max, unsigned int vary)
{
  val += randInt(2*vary+1)-vary;
  return (val > max) ? max : ( (val < min) ? min : val );
}