55 lines
1.1 KiB
C++
55 lines
1.1 KiB
C++
#ifndef DITHERING_UTILITY_HPP
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#define DITHERING_UTILITY_HPP
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#include <cmath>
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#include <functional>
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#include <optional>
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#include <utility>
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namespace utility {
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inline int twoToOne(int x, int y, int width, int height) {
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while (x < 0) {
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x += width;
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}
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while (y < 0) {
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y += height;
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}
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x = x % width;
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y = y % height;
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return x + y * width;
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}
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inline std::pair<int, int> oneToTwo(int i, int width) {
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return {i % width, i / width};
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}
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inline float dist(int a, int b, int width) {
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auto axy = utility::oneToTwo(a, width);
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auto bxy = utility::oneToTwo(b, width);
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float dx = axy.first - bxy.first;
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float dy = axy.second - bxy.second;
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return std::sqrt(dx * dx + dy * dy);
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}
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class Cleanup {
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public:
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Cleanup();
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Cleanup(std::function<void(void *)> fn, void *ptr);
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~Cleanup();
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// allow move
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Cleanup(Cleanup &&);
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Cleanup &operator=(Cleanup &&);
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// deny copy
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Cleanup(const Cleanup &) = delete;
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Cleanup &operator=(const Cleanup &) = delete;
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private:
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std::optional<std::function<void(void *)>> fn;
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void *ptr;
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};
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} // namespace utility
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#endif
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