jcmp: My image compression format (w/ wavelets)
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#pragma once
#include <string>
#include <chrono>
inline bool is_pow_of_two(int n){
return (n & (n - 1)) == 0;
}
// calculates integer 2-log such that:
// 2^(two_log(x)) >= x > 2^(two_log(x) - 1)
unsigned int two_log(unsigned int x){
if(x <= 1) return 0;
return 8*sizeof(unsigned int) - __builtin_clz(x-1);
}
inline std::string human_string(int n){
static const std::string names [] = {"", "K", "M", "G"};
int i = 0;
while(n > 1000 && i < sizeof(names)){
n /= 1000;
++i;
}
return std::to_string(n) + names[i];
}
inline std::string field(std::string const & str){
const int length = 12;
if(str.size() > length) return str + ":\t";
auto add = length - str.size();
return str + ":" + std::string(add, ' ') + "\t";
}
struct timer{
typedef std::chrono::high_resolution_clock clock;
typedef std::chrono::time_point<clock> time;
typedef std::chrono::duration<double> seconds;
std::string name;
time begin;
timer(std::string name)
: name(name)
, begin(clock::now())
{}
~timer(){
time end = clock::now();
seconds elapsed = end - begin;
std::cout << name << "\t" << elapsed.count() << std::endl;
}
};