diff options
Diffstat (limited to 'examples/pixel_art.cpp')
| -rw-r--r-- | examples/pixel_art.cpp | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/examples/pixel_art.cpp b/examples/pixel_art.cpp new file mode 100644 index 0000000..003ffe9 --- /dev/null +++ b/examples/pixel_art.cpp @@ -0,0 +1,120 @@ +#if 0 +g++ $0 -std=c++14 -Iinclude && ./a.out && rm -f a.out && qiv panda.ppm 1up.ppm +exit +#else + +#include <array> +#include <frozen/map.h> +#include <fstream> + +constexpr frozen::map<char, std::array<char, 3>, 5> Tans{ + {'R', {(char)0xFF, (char)0x00, (char)0x00}}, + {'G', {(char)0x00, (char)0xFF, (char)0x00}}, + {'B', {(char)0x00, (char)0x00, (char)0xFF}}, + {'#', {(char)0x00, (char)0x00, (char)0x00}}, + {' ', {(char)0xFF, (char)0xFF, (char)0xFF}}, +}; + +constexpr unsigned itoa(unsigned char * start, unsigned i) { + constexpr unsigned step = sizeof(unsigned) * 3; + for(unsigned k = 0; k < step; ++k) + *start++ = ' '; + do { + *--start = '0' + i % 10; + i /= 10; + } while(i); + return step; +} + +template <unsigned H, unsigned W> struct ppm { + unsigned char bytes[9 /* fixed header*/ + sizeof(unsigned) * 3 * 2 /* to hold sizes */ + 3 * H * W]; + + constexpr ppm(unsigned char const *data) : bytes{0} { + unsigned j = 0; + bytes[j++] = 'P'; + bytes[j++] = '6'; + bytes[j++] = ' '; + + j += itoa(bytes + j, H); + + bytes[j++] = ' '; + + j += itoa(bytes + j, W); + + bytes[j++] = ' '; + bytes[j++] = '2'; + bytes[j++] = '5'; + bytes[j++] = '5'; + bytes[j++] = '\n'; + for (unsigned i = 0; i < H * W; ++i) { + auto const code = Tans.find(data[i])->second; + bytes[j + 3 * i + 0] = code[0]; + bytes[j + 3 * i + 1] = code[1]; + bytes[j + 3 * i + 2] = code[2]; + } + } + + void save(char const path[]) const { + std::ofstream out{path, std::ios::binary}; + out.write((char *)bytes, sizeof bytes); + } +}; + +void make_panda() { + constexpr unsigned char bytes[] = " ### ### " + " ##### ########## ##### " + " ####### ####### " + " #### #### " + " ### ### " + " # # " + " # # " + " # ### ### # " + " # ##### ##### # " + " # #### # # #### # " + " # #### # # #### # " + " # ##### ##### # " + " # ### ## ### # " + " # ## # " + " #### RRR RRR #### " + " ######RRRRR RRRRR###### " + " ######RRRRRRRRRRRR###### " + " ######RRRRRRRRRRRR###### " + " ######RRRRRRRRRRRR###### " + " #######RRRRRRRRRR####### " + " ##### RRRRRRRR #### " + " ### RRRRRR ## " + " RRRR "; + constexpr ppm<26, 22> some{bytes}; + some.save("panda.ppm"); +} + +void make_1up() { + constexpr unsigned char bytes[] = " ###### " + " ##GGGG ## " + " # GGGG # " + " # GGGGGG # " + " # GG GG # " + " #GGG GGGGG# " + " #GGG GG G# " + " # GG G # " + " # GG GG # " + " # GGGGGGGGG G# " + " # GG########GGG# " + " ### # # ### " + " # # # # " + " # # " + " # # " + " ######## " + + ; + constexpr ppm<18, 16> some{bytes}; + some.save("1up.ppm"); +} + +int main() { + make_panda(); + make_1up(); + return 0; +} + +#endif |