52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
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#include <iostream>
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#include <fstream>
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#include <png++/png.hpp>
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#define CACHESIZE 4096u //must be lower than 2^13
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#define __CACHESIZE (CACHESIZE*4u) //Do not edit
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int main(int argc, char *argv[])
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{
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if (argc < 3)
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{
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std::cerr << "USAGE: " << argv[0] << " INPUT.PNG OUTPUT" << std::endl;
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exit(EXIT_FAILURE);
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}
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png::image< png::rgb_pixel > input(argv[1]);
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std::ofstream bitmap(argv[2]);
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uint32_t width, height, x, y;
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width = input.get_width();
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height = input.get_height();
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x = y = 0;
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size_t i = 0;
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bitmap << width << " " << height << " ";
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char* cache = new char[__CACHESIZE];
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while (i < width*height*4)
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{
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x = ((uint32_t) i/4 ) % width;
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y = (uint32_t)(i/4/width);
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cache[(i+1)%__CACHESIZE] = input[y][x].red;
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cache[(i+0)%__CACHESIZE] = input[y][x].green;
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cache[(i+3)%__CACHESIZE] = input[y][x].blue;
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cache[(i+2)%__CACHESIZE] = 255;
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i+=4;
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if (i % __CACHESIZE == 0) //Write
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bitmap.write(cache, __CACHESIZE);
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}
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if (i % __CACHESIZE != 0) //Write what has not been written
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bitmap.write(cache, width*height*4 % __CACHESIZE);
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delete[] cache;
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bitmap.close();
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return EXIT_SUCCESS;
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}
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