Blarx

#include <iostream>
#include "png++/png.hpp"
#include <ctime>

using namespace png;

int main() {
    size_t x = 10000;
    size_t y = 5000;
    clock_t start;
    float elapsed;
    image<rgb_pixel> img(x,y);
    std::cout << "iterativ: ";
    start = clock();
    for(size_t i=0; i<y; ++i) {
        for(size_t j=0; j<x; ++j) {
            img[i][j].red=255;
            img[i][j].green=0;
            img[i][j].blue=0;
        }
    }
    elapsed = (float)(clock() - start) / CLOCKS_PER_SEC;
    std::cout << elapsed << std::endl;
    img.write("test1.png");
    image<rgb_pixel> img2(x,y);
    std::cout << "Pointer: ";
    start = clock();
    rgb_pixel *pPtr;
    for(size_t i=0; i<y; ++i) {
        pPtr = &img2[i][0];
        for(size_t j = 0; j<x; ++j) {
            (*pPtr).red=0;
            (*pPtr).green=255;
            (*pPtr).blue=0;
            ++pPtr;
        }
    }
    elapsed = (float)(clock() - start) / CLOCKS_PER_SEC;
    std::cout << elapsed << std::endl;
    img2.write("test2.png");
    image<rgb_pixel> img3(x,y);
    std::cout << "Iterativ2: ";
    start = clock();
    for(size_t i=0; i<y; ++i) {
        for(size_t j=0; j<x; ++j) {
            img3.set_pixel(j,i,basic_rgb_pixel<byte>(0,0,255));
        }
    }
    elapsed = (float)(clock() - start) / CLOCKS_PER_SEC;
    std::cout << elapsed << std::endl;
    img3.write("test3.png");
    image<rgb_pixel> img4(x,y);
    std::cout << "Pointer2: ";
    start = clock();
    rgb_pixel *pPtr2;
    for(size_t i=0; i<y; ++i) {
        pPtr2 = &img4[i][0];
        for(size_t j=0; j<x; ++j) {
            (*pPtr2)=basic_rgb_pixel<byte>(255,255,0);
            ++pPtr2;
        }
    }
    elapsed = (float)(clock() - start) / CLOCKS_PER_SEC;
    std::cout << elapsed << std::endl;
    img4.write("test4.png");
    return 0;
}