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chrc.cpp
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chrc.cpp
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#include <cstdio>
#include <cstdlib>
#include <array>
using tile_t = std::array<unsigned char, 16>;
// dcdcbaba
tile_t make_tile(unsigned char i)
{
unsigned char const nw = ((i >> 5) & 1) | ((i >> 6) & 2);
unsigned char const ne = ((i >> 4) & 1) | ((i >> 5) & 2);
unsigned char const sw = ((i >> 1) & 1) | ((i >> 2) & 2);
unsigned char const se = ((i >> 0) & 1) | ((i >> 1) & 2);
unsigned char p[2][2] = {};
switch(nw)
{
case 3: p[0][0] |= 0b11110000; p[1][0] |= 0b11110000; break;
case 2: p[1][0] |= 0b11110000; break;
case 1: p[0][0] |= 0b11110000; break;
default: break;
}
switch(ne)
{
case 3: p[0][0] |= 0b00001111; p[1][0] |= 0b00001111; break;
case 2: p[1][0] |= 0b00001111; break;
case 1: p[0][0] |= 0b00001111; break;
default: break;
}
switch(sw)
{
case 3: p[0][1] |= 0b11110000; p[1][1] |= 0b11110000; break;
case 2: p[1][1] |= 0b11110000; break;
case 1: p[0][1] |= 0b11110000; break;
default: break;
}
switch(se)
{
case 3: p[0][1] |= 0b00001111; p[1][1] |= 0b00001111; break;
case 2: p[1][1] |= 0b00001111; break;
case 1: p[0][1] |= 0b00001111; break;
default: break;
}
return
{{
p[0][0], p[0][0], p[0][0], p[0][0],
p[0][1], p[0][1], p[0][1], p[0][1],
p[1][0], p[1][0], p[1][0], p[1][0],
p[1][1], p[1][1], p[1][1], p[1][1],
}};
}
int main(int argc, char** argv)
{
if(argc != 2)
{
std::fprintf(stderr, "usage: %s [outfile]\n", argv[0]);
return EXIT_FAILURE;
}
FILE* fp = std::fopen(argv[1], "wb");
if(!fp)
{
std::fprintf(stderr, "can't open file %s\n", argv[1]);
return EXIT_FAILURE;
}
for(unsigned i = 0; i != 256; ++i)
for(unsigned char byte : make_tile(i))
std::fputc(byte, fp);
std::fclose(fp);
}