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#include "imgen.h"
namespace {
inline void write_color(std::ofstream& out, const imgen::color& color) {
out << std::get<0>(color)
<< std::get<1>(color)
<< std::get<2>(color);
}
}
namespace imgen {
ppm_pixel_stream::ppm_pixel_stream(
const std::string& path,
const std::size_t width,
const std::size_t height
): stream_() {
this->stream_.open(path, std::ios::binary | std::ios::out);
this->stream_.sync_with_stdio(false);
this->stream_ << "P6\n" << width << " " << height << "\n255\n";
}
ppm_pixel_stream& ppm_pixel_stream::operator<<(const color& value) {
write_color(this->stream_, value);
return *this;
}
void write_ppm(
const std::string& path,
const std::size_t width,
const std::size_t height,
std::function<color(std::ptrdiff_t, std::ptrdiff_t)> generator
) {
ppm_pixel_stream file(path, width, height);
const std::ptrdiff_t min_y = height / 2 * -1;
const std::ptrdiff_t max_y = height / 2;
const std::ptrdiff_t min_x = width / 2 * -1;
const std::ptrdiff_t max_x = width / 2;
for ( std::ptrdiff_t posY = min_y; posY < max_y; ++posY ) {
for ( std::ptrdiff_t posX = min_x; posX < max_x; ++posX ) {
file << generator(posX, posY);
}
}
}
}
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