YAPC::EU 2018 Glasgow Update!
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Ingy döt Net
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1170 changed files with 15042 additions and 3047 deletions
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#include <iostream>
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#include <string>
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#include <sstream>
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#include <valarray>
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const std::string input {
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"................................"
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".#########.......########......."
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".###...####.....####..####......"
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".###....###.....###....###......"
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".###...####.....###............."
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".#########......###............."
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".###.####.......###....###......"
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".###..####..###.####..####.###.."
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".###...####.###..########..###.."
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"................................"
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};
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const std::string input2 {
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".........................................................."
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".#################...................#############........"
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".##################...............################........"
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".###################............##################........"
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".########.....#######..........###################........"
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"...######.....#######.........#######.......######........"
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"...######.....#######........#######......................"
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"...#################.........#######......................"
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"...################..........#######......................"
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"...#################.........#######......................"
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"...######.....#######........#######......................"
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"...######.....#######........#######......................"
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"...######.....#######.........#######.......######........"
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".########.....#######..........###################........"
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".########.....#######.######....##################.######."
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".########.....#######.######......################.######."
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".########.....#######.######.........#############.######."
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".........................................................."
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};
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class ZhangSuen;
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class Image {
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public:
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friend class ZhangSuen;
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using pixel_t = char;
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static const pixel_t BLACK_PIX;
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static const pixel_t WHITE_PIX;
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Image(unsigned width = 1, unsigned height = 1)
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: width_{width}, height_{height}, data_( '\0', width_ * height_)
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{}
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Image(const Image& i) : width_{ i.width_}, height_{i.height_}, data_{i.data_}
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{}
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Image(Image&& i) : width_{ i.width_}, height_{i.height_}, data_{std::move(i.data_)}
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{}
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~Image() = default;
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Image& operator=(const Image& i) {
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if (this != &i) {
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width_ = i.width_;
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height_ = i.height_;
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data_ = i.data_;
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}
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return *this;
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}
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Image& operator=(Image&& i) {
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if (this != &i) {
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width_ = i.width_;
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height_ = i.height_;
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data_ = std::move(i.data_);
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}
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return *this;
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}
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size_t idx(unsigned x, unsigned y) const noexcept { return y * width_ + x; }
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bool operator()(unsigned x, unsigned y) {
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return data_[idx(x, y)];
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}
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friend std::ostream& operator<<(std::ostream& o, const Image& i) {
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o << i.width_ << " x " << i.height_ << std::endl;
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size_t px = 0;
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for(const auto& e : i.data_) {
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o << (e?Image::BLACK_PIX:Image::WHITE_PIX);
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if (++px % i.width_ == 0)
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o << std::endl;
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}
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return o << std::endl;
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}
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friend std::istream& operator>>(std::istream& in, Image& img) {
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auto it = std::begin(img.data_);
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const auto end = std::end(img.data_);
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Image::pixel_t tmp;
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while(in && it != end) {
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in >> tmp;
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if (tmp != Image::BLACK_PIX && tmp != Image::WHITE_PIX)
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throw "Bad character found in image";
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*it = (tmp == Image::BLACK_PIX)?1:0;
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++it;
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}
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return in;
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}
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unsigned width() const noexcept { return width_; }
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unsigned height() const noexcept { return height_; }
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struct Neighbours {
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// 9 2 3
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// 8 1 4
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// 7 6 5
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Neighbours(const Image& img, unsigned p1_x, unsigned p1_y)
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: img_{img}
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, p1_{img.idx(p1_x, p1_y)}
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, p2_{p1_ - img.width()}
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, p3_{p2_ + 1}
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, p4_{p1_ + 1}
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, p5_{p4_ + img.width()}
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, p6_{p5_ - 1}
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, p7_{p6_ - 1}
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, p8_{p1_ - 1}
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, p9_{p2_ - 1}
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{}
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const Image& img_;
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const Image::pixel_t& p1() const noexcept { return img_.data_[p1_]; }
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const Image::pixel_t& p2() const noexcept { return img_.data_[p2_]; }
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const Image::pixel_t& p3() const noexcept { return img_.data_[p3_]; }
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const Image::pixel_t& p4() const noexcept { return img_.data_[p4_]; }
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const Image::pixel_t& p5() const noexcept { return img_.data_[p5_]; }
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const Image::pixel_t& p6() const noexcept { return img_.data_[p6_]; }
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const Image::pixel_t& p7() const noexcept { return img_.data_[p7_]; }
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const Image::pixel_t& p8() const noexcept { return img_.data_[p8_]; }
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const Image::pixel_t& p9() const noexcept { return img_.data_[p9_]; }
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const size_t p1_, p2_, p3_, p4_, p5_, p6_, p7_, p8_, p9_;
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};
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Neighbours neighbours(unsigned x, unsigned y) const { return Neighbours(*this, x, y); }
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private:
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unsigned height_ { 0 };
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unsigned width_ { 0 };
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std::valarray<pixel_t> data_;
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};
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constexpr const Image::pixel_t Image::BLACK_PIX = '#';
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constexpr const Image::pixel_t Image::WHITE_PIX = '.';
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class ZhangSuen {
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public:
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// the number of transitions from white to black, (0 -> 1) in the sequence P2,P3,P4,P5,P6,P7,P8,P9,P2
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unsigned transitions_white_black(const Image::Neighbours& a) const {
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unsigned sum = 0;
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sum += (a.p9() == 0) && a.p2();
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sum += (a.p2() == 0) && a.p3();
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sum += (a.p3() == 0) && a.p4();
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sum += (a.p8() == 0) && a.p9();
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sum += (a.p4() == 0) && a.p5();
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sum += (a.p7() == 0) && a.p8();
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sum += (a.p6() == 0) && a.p7();
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sum += (a.p5() == 0) && a.p6();
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return sum;
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}
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// The number of black pixel neighbours of P1. ( = sum(P2 .. P9) )
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unsigned black_pixels(const Image::Neighbours& a) const {
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unsigned sum = 0;
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sum += a.p9();
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sum += a.p2();
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sum += a.p3();
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sum += a.p8();
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sum += a.p4();
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sum += a.p7();
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sum += a.p6();
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sum += a.p5();
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return sum;
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}
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const Image& operator()(const Image& img) {
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tmp_a_ = img;
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size_t changed_pixels = 0;
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do {
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changed_pixels = 0;
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// Step 1
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tmp_b_ = tmp_a_;
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for(size_t y = 1; y < tmp_a_.height() - 1; ++y) {
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for(size_t x = 1; x < tmp_a_.width() - 1; ++x) {
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if (tmp_a_.data_[tmp_a_.idx(x, y)]) {
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auto n = tmp_a_.neighbours(x, y);
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auto bp = black_pixels(n);
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if (bp >= 2 && bp <= 6) {
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auto tr = transitions_white_black(n);
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if ( tr == 1
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&& (n.p2() * n.p4() * n.p6() == 0)
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&& (n.p4() * n.p6() * n.p8() == 0)
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) {
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tmp_b_.data_[n.p1_] = 0;
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++changed_pixels;
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}
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}
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}
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}
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}
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// Step 2
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tmp_a_ = tmp_b_;
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for(size_t y = 1; y < tmp_b_.height() - 1; ++y) {
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for(size_t x = 1; x < tmp_b_.width() - 1; ++x) {
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if (tmp_b_.data_[tmp_b_.idx(x, y)]) {
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auto n = tmp_b_.neighbours(x, y);
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auto bp = black_pixels(n);
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if (bp >= 2 && bp <= 6) {
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auto tr = transitions_white_black(n);
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if ( tr == 1
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&& (n.p2() * n.p4() * n.p8() == 0)
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&& (n.p2() * n.p6() * n.p8() == 0)
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) {
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tmp_a_.data_[n.p1_] = 0;
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++changed_pixels;
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}
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}
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}
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}
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}
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} while(changed_pixels > 0);
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return tmp_a_;
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}
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private:
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Image tmp_a_;
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Image tmp_b_;
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};
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int main(int argc, char const *argv[])
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{
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using namespace std;
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Image img(32, 10);
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istringstream iss{input};
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iss >> img;
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cout << img;
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cout << "ZhangSuen" << endl;
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ZhangSuen zs;
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Image res = std::move(zs(img));
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cout << res << endl;
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Image img2(58,18);
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istringstream iss2{input2};
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iss2 >> img2;
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cout << img2;
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cout << "ZhangSuen with big image" << endl;
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Image res2 = std::move(zs(img2));
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cout << res2 << endl;
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return 0;
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}
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@ -1,5 +1,3 @@
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/*Abhishek Ghosh, 24th September 2017*/
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#include<stdlib.h>
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#include<stdio.h>
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