38 lines
975 B
C++
38 lines
975 B
C++
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#include "blue_noise.hpp"
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#include <random>
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std::vector<bool> dither::blue_noise(std::size_t width, std::size_t height) {
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std::size_t count = width * height;
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std::vector<std::size_t> dither_array;
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dither_array.resize(count);
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std::vector<bool> pbp; // Prototype Binary Pattern
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pbp.resize(count);
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std::default_random_engine re(std::random_device{}());
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std::uniform_int_distribution<std::size_t> dist(0, count - 1);
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// initialize pbp
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for(std::size_t i = 0; i < count; ++i) {
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if(i < count / 2) {
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pbp[i] = true;
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} else {
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pbp[i] = false;
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}
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}
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// randomize pbp
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for(std::size_t i = 0; i < count-1; ++i) {
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decltype(dist)::param_type range{i+1, count-1};
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std::size_t ridx = dist(re, range);
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// probably can't use std::swap since using std::vector<bool>
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bool temp = pbp[i];
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pbp[i] = pbp[ridx];
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pbp[ridx] = temp;
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}
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return {};
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}
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