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29 lines
860 B
C++
29 lines
860 B
C++
#include <fstream>
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#include <cassert>
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#include "utils.h"
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uint32_t pack_color(const uint8_t r, const uint8_t g, const uint8_t b, const uint8_t a) {
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return (a<<24) + (b<<16) + (g<<8) + r;
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}
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void unpack_color(const uint32_t &color, uint8_t &r, uint8_t &g, uint8_t &b, uint8_t &a) {
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r = (color >> 0) & 255;
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g = (color >> 8) & 255;
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b = (color >> 16) & 255;
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a = (color >> 24) & 255;
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}
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void drop_ppm_image(const std::string filename, const std::vector<uint32_t> &image, const size_t w, const size_t h) {
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assert(image.size() == w*h);
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std::ofstream ofs(filename);
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ofs << "P6\n" << w << " " << h << "\n255\n";
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for (size_t i = 0; i < h*w; ++i) {
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uint8_t r, g, b, a;
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unpack_color(image[i], r, g, b, a);
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ofs << static_cast<char>(r) << static_cast<char>(g) << static_cast<char>(b);
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}
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ofs.close();
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}
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