[Olena-patches] 2847: Introduce a factoring functor to load OFF image files.

* mln/io/off/load.hh (mln::io::off::internal::off_loader) (mln::io::off::internal::bin_off_loader): New classes. Use it to factor... (mln::io::off::load(bin_2complex_image3df&, const std::string&)): ...this function. (mln::io::off::internal::eat_comment): Remove. --- milena/ChangeLog | 13 + milena/mln/io/off/load.hh | 579 +++++++++++++++++++++++++++++---------------- 2 files changed, 387 insertions(+), 205 deletions(-) diff --git a/milena/ChangeLog b/milena/ChangeLog index 3ffe29b..02fdd91 100644 --- a/milena/ChangeLog +++ b/milena/ChangeLog @@ -1,5 +1,18 @@ 2008-11-12 Roland Levillain &lt;roland(a)lrde.epita.fr&gt; + Introduce a factoring functor to load OFF image files. + + * mln/io/off/load.hh + (mln::io::off::internal::off_loader) + (mln::io::off::internal::bin_off_loader): + New classes. + Use it to factor... + (mln::io::off::load(bin_2complex_image3df&, const std::string&)): + ...this function. + (mln::io::off::internal::eat_comment): Remove. + +2008-11-12 Roland Levillain &lt;roland(a)lrde.epita.fr&gt; + Add new typedefs for commonly-used complex-based images. * mln/core/alias/complex_geometry.hh: New. diff --git a/milena/mln/io/off/load.hh b/milena/mln/io/off/load.hh index 05160d0..4e9e86d 100644 --- a/milena/mln/io/off/load.hh +++ b/milena/mln/io/off/load.hh @@ -32,6 +32,7 @@ /// \brief Input loading function for OFF files. /// /// \see http://shape.cs.princeton.edu/benchmark/documentation/off_format.html +/// \see https://people.scs.fsu.edu/~burkardt/html/off_format.html # include <cstdlib> @@ -40,6 +41,7 @@ # include <string> +# include <mln/core/concept/object.hh> # include <mln/core/alias/complex_image.hh> @@ -63,231 +65,395 @@ namespace mln namespace internal { - /// A stream manipulator eating comments starting with a `#' - /// and ending at an end of line - std::istream& eat_comment (std::istream& istr); - } + + template <typename I, typename E> + struct off_loader : public Object<E> + { + typedef off_loader<I, E> self; + + /// Dimension of the built complex. + static const unsigned D = 2; + /// Type of the set of values. + typedef metal::vec<D + 1, std::vector< mln_value(I) > > values; + /// Type of the domain. + typedef mln_pset(I) domain; + + /// \brief Constructor, with static checks. + off_loader(); + + /// Load an image from \a filename into \a ima. + void operator()(I& ima, const std::string& filename); + + /// A stream manipulator eating comments starting with a `#' + /// and ending at an end of line. + static std::istream& eat_comment(std::istream& istr); + }; + + + struct bin_off_loader + : public off_loader< bin_2complex_image3df, bin_off_loader > + { + /// \brief Read face data. + /// + /// Dummy, does nothings (but required by the super class). + void read_face_data(std::istream& istr); + + /// \brief Assign values to image. + void assign(values& vs, const domain& s); + + /// \brief Pre-allocate data. + /// + /// Dummy, does nothings (but required by the super class). + void reserve(unsigned nvertices, unsigned nedges, unsigned nfaces); + }; + + } // end of namespace mln::io::off::internal + # ifndef MLN_INCLUDE_ONLY - void load(bin_2complex_image3df& ima, const std::string& filename) + /*----------. + | Facades. | + `----------*/ + + void + load(bin_2complex_image3df& ima, const std::string& filename) { trace::entering("mln::io::off::load"); + internal::bin_off_loader()(ima, filename); + trace::exiting("mln::io::off::load"); + } + - const std::string me = "mln::io::off::load"; + /*-------------------------. + | Actual implementations. | + `-------------------------*/ - std::ifstream istr(filename.c_str()); - if (!istr) + // -------- // + // Canvas. // + // -------- // + + namespace internal + { + + template <typename I, typename E> + inline + off_loader<I, E>::off_loader() { - std::cerr << me << ": `" << filename << "' not found." << std::endl; - /* FIXME: Too violent. We should allow the use of - exceptions, at least to have Milena's code behave - correctly in interpreted environments (std::exit() or - std::abort() causes the termination of a Python - interpreter, for instance!). */ - std::exit(1); + // Concept checking. + void (E::*m1)(std::istream&) = &E::read_face_data; + m1 = 0; + void (E::*m2)(unsigned, unsigned, unsigned) = &E::reserve; + m2 = 0; + void (E::*m3)(values&, const domain&) = &E::assign; + m3 = 0; } - /*---------. - | Header. | - `---------*/ - - /* ``The .off files in the Princeton Shape Benchmark conform - to the following standard''. */ - - /* ``OFF files are all ASCII files beginning with the keyword - OFF. '' */ - std::string type; - istr >> internal::eat_comment >> type; - if (type != "OFF") - { - std::cerr << me << ": `" << filename << "': ill-formed header." - << std::endl; - std::exit(1); - } - - /* ``The next line states the number of vertices, the number - of faces, and the number of edges. The number of edges can - be safely ignored.'' */ - unsigned nvertices, nfaces, nedges; - istr >> internal::eat_comment >> nvertices - >> internal::eat_comment >> nfaces - >> internal::eat_comment >> nedges; - - /*-------. - | Data. | - `-------*/ - - /* FIXME: Maybe we could sugar all this (using make_whatever - helpers?). */ - // --------- // - // Complex. // - // --------- // + template <typename I, typename E> + inline + void + off_loader<I, E>::operator()(I& ima, const std::string& filename) + { + const std::string me = "mln::io::off::load"; + + std::ifstream istr(filename.c_str()); + if (!istr) + { + std::cerr << me << ": `" << filename << "' not found." + << std::endl; + /* FIXME: Too violent. We should allow the use of + exceptions, at least to have Milena's code behave + correctly in interpreted environments (std::exit() or + std::abort() causes the termination of a Python + interpreter, for instance!). */ + std::exit(1); + } + + /*---------. + | Header. | + `---------*/ + + /* ``The .off files in the Princeton Shape Benchmark conform + to the following standard''. */ + + /* ``OFF files are all ASCII files beginning with the keyword + OFF. '' */ + std::string type; + istr >> &self::eat_comment >> type; + if (type != "OFF") + { + std::cerr << me << ": `" << filename << "': ill-formed header." + << std::endl; + std::exit(1); + } + + /* ``The next line states the number of vertices, the number + of faces, and the number of edges. The number of edges can + be safely ignored.'' */ + unsigned nvertices, nfaces, nedges; + istr >> &self::eat_comment >> nvertices + >> &self::eat_comment >> nfaces + >> &self::eat_comment >> nedges; - const unsigned D = 2; - topo::complex<D> c; + /// Possilby pre-allocate data. + exact(this)->reserve(nvertices, nedges, nfaces); - // ------------------------------------------ // - // Vertices & geometry (vertices locations). // - // ------------------------------------------ // + /*-------. + | Data. | + `-------*/ - /* ``The vertices are listed with x, y, z coordinates, written - one per line. */ + /* FIXME: Maybe we could sugar all this (using make_whatever + helpers?). */ - /* FIXME: We should have a faster way to create a bunch of - 0-faces (vertices). */ - for (unsigned v = 0; v < nvertices; ++v) + // --------- // + // Complex. // + // --------- // + + const unsigned D = 2; + topo::complex<D> c; + + // ------------------------------------------ // + // Vertices & geometry (vertices locations). // + // ------------------------------------------ // + + /* ``The vertices are listed with x, y, z coordinates, written + one per line.'' */ + + /* FIXME: We should have a faster way to create a bunch of + 0-faces (vertices). */ + for (unsigned v = 0; v < nvertices; ++v) c.add_face(); - typedef point3df P; - typedef mln_coord_(P) C; - typedef geom::complex_geometry<D, P> G; - G geom; - for (unsigned v = 0; v < nvertices; ++v) - { - C x, y, z; - istr >> internal::eat_comment >> x - >> internal::eat_comment >> y - >> internal::eat_comment >> z; - geom.add_location(point3df(x, y, z)); - } - - // --------------- // - // Faces & edges. // - // --------------- // - - /* After the list of vertices, the faces are listed, with one - face per line. For each face, the number of vertices is - specified, followed by indices into the list of - vertices.'' */ - - // An adjacenty matrix recording the edges seen so far. - typedef std::vector< std::vector<bool> > complex_edges_t; - complex_edges_t complex_edges (nvertices, - std::vector<bool>(nvertices, false)); - - for (unsigned f = 0; f < nfaces; ++f) - { - unsigned nface_vertices; - istr >> internal::eat_comment >> nface_vertices; - if (nface_vertices <= 2) - { - std::cerr << me << ": `" << filename - << "': ill-formed face (" << nface_vertices - << " vertices)" << std::endl; - std::exit(1); - } - - // The edges of the face. - topo::n_faces_set<1, D> face_edges_set; - face_edges_set.reserve(nface_vertices); - - // The first vertex id of the face. - unsigned first_vertex_id; - istr >> internal::eat_comment >> first_vertex_id; - // The current vertex id initialized with the first id. - unsigned vertex_id = first_vertex_id; - if (first_vertex_id >= nvertices) - { - std::cerr << me << ": `" << filename - << "': invalid vertex id " << first_vertex_id - << std::endl; - std::exit(1); - } - // Iterate on vertices and form edges. - for (unsigned v = 0; v < nface_vertices; ++v) - { - /* The next vertex id. The pair (vertex_id, next_vertex_id) - is an edge of the mesh/complex. */ - unsigned next_vertex_id; - /* When V is the id of the last vertex of the face F, - set next_vertex_id to first_vertex_id; otherwise, - read it from the input. */ - if (v == nface_vertices - 1) - next_vertex_id = first_vertex_id; - else - { - istr >> internal::eat_comment >> next_vertex_id; - if (next_vertex_id >= nvertices) - { - std::cerr << me << ": `" << filename - << "': invalid vertex id " << next_vertex_id - << std::endl; - std::exit(1); - } - } - // The ends of the current edge. - topo::n_face<0, D> vertex(c, vertex_id); - topo::n_face<0, D> next_vertex(c, next_vertex_id); - // The current edge. - topo::algebraic_n_face<1, D> edge; - // If the edge has been constructed yet, create it; - // otherwise, retrieve its id from the complex. - if (!complex_edges[vertex_id][next_vertex_id]) - { - complex_edges[vertex_id][next_vertex_id] = true; - complex_edges[next_vertex_id][vertex_id] = true; - edge = - make_algebraic_n_face(c.add_face(vertex - next_vertex), - true); - } - else - { - edge = topo::edge(vertex, next_vertex); - mln_assertion(edge.is_valid()); - } - // Record this edge. - face_edges_set += edge; - // Next vertex. - vertex_id = next_vertex_id; - } - - // Add face. - c.add_face(face_edges_set); - } - - /*--------. - | Image. | - `--------*/ - - // Value type. - typedef bool V; - - // Site set. - p_complex<D, G> pc(c, geom); - - // Values. - metal::vec<D + 1, std::vector<V> > values; - for (unsigned i = 0; i <= D; ++i) - values[i].insert(values[i].begin(), pc.cplx().nfaces(i), true); - - // Image. - ima.init_(pc, values); - - /*--------------. - | End of file. | - `--------------*/ - - istr >> internal::eat_comment; - if (!istr.eof()) - { - std::cerr << me << ": `" << filename - << "': end of file not reached" << std::endl; - std::exit(1); - } - istr.close(); + typedef point3df P; + typedef mln_coord_(P) C; + typedef geom::complex_geometry<D, P> G; + G geom; + for (unsigned v = 0; v < nvertices; ++v) + { + C x, y, z; + istr >> &self::eat_comment >> x + >> &self::eat_comment >> y + >> &self::eat_comment >> z; + geom.add_location(point3df(x, y, z)); + } - trace::exiting("mln::io::off::load"); - } + // --------------- // + // Faces & edges. // + // --------------- // + /* ``After the list of vertices, the faces are listed, with + one face per line. For each face, the number of vertices + is specified, followed by indices into the list of + vertices.'' */ - namespace internal - { - /// A stream manipulator eating comments starting with a `#' - /// and ending at an end of line - std::istream& eat_comment (std::istream& istr) + // An adjacenty matrix recording the edges seen so far. + typedef std::vector< std::vector<bool> > complex_edges_t; + complex_edges_t complex_edges (nvertices, + std::vector<bool>(nvertices, false)); + + for (unsigned f = 0; f < nfaces; ++f) + { + unsigned nface_vertices; + istr >> &self::eat_comment >> nface_vertices; + if (nface_vertices <= 2) + { + std::cerr << me << ": `" << filename + << "': ill-formed face (having " + << nface_vertices << ' ' + << (nface_vertices < 2 ? "vertex" : "vertices") + << ')' << std::endl; + std::exit(1); + } + + // The edges of the face. + topo::n_faces_set<1, D> face_edges_set; + face_edges_set.reserve(nface_vertices); + + // The first vertex id of the face. + unsigned first_vertex_id; + istr >> &self::eat_comment >> first_vertex_id; + // The current vertex id initialized with the first id. + unsigned vertex_id = first_vertex_id; + if (first_vertex_id >= nvertices) + { + std::cerr << me << ": `" << filename + << "': invalid vertex id " << first_vertex_id + << std::endl; + std::exit(1); + } + // Iterate on vertices and form edges. + for (unsigned v = 0; v < nface_vertices; ++v) + { + /* The next vertex id. The pair (vertex_id, + next_vertex_id) is an edge of the + mesh/complex. */ + unsigned next_vertex_id; + /* When V is the id of the last vertex of the face F, + set next_vertex_id to first_vertex_id; otherwise, + read it from the input. */ + if (v == nface_vertices - 1) + next_vertex_id = first_vertex_id; + else + { + istr >> &self::eat_comment >> next_vertex_id; + if (next_vertex_id >= nvertices) + { + std::cerr << me << ": `" << filename + << "': invalid vertex id " + << next_vertex_id << std::endl; + std::exit(1); + } + } + // The ends of the current edge. + topo::n_face<0, D> vertex(c, vertex_id); + topo::n_face<0, D> next_vertex(c, next_vertex_id); + // The current edge. + topo::algebraic_n_face<1, D> edge; + // If the edge has been constructed yet, create it; + // otherwise, retrieve its id from the complex. + if (!complex_edges[vertex_id][next_vertex_id]) + { + complex_edges[vertex_id][next_vertex_id] = true; + complex_edges[next_vertex_id][vertex_id] = true; + edge = + make_algebraic_n_face(c.add_face(vertex - + next_vertex), + true); + } + else + { + edge = topo::edge(vertex, next_vertex); + mln_assertion(edge.is_valid()); + } + // Record this edge. + face_edges_set += edge; + // Next vertex. + vertex_id = next_vertex_id; + } + + // Possibly read a value (depends on the actual format). + exact(this)->read_face_data(istr); + + // Add face. + c.add_face(face_edges_set); + } + + /*--------. + | Image. | + `--------*/ + + // Site set. + domain s(c, geom); + + // Values + values vs; + exact(this)->assign(vs, s); + + // Image. + ima.init_(s, vs); + + /*--------------. + | End of file. | + `--------------*/ + + istr >> &self::eat_comment; + if (!istr.eof()) + { + std::cerr << me << ": `" << filename + << "': end of file not reached" << std::endl; + std::exit(1); + } + istr.close(); + } + + + // ---------------- // + // Specific parts. // + // ---------------- // + + /* FIXME: We do not honor the part + + ``Line breaks are significant here: the color description + begins after VertN and ends with the end of the line (or + the next # comment). + + in the following comment. */ + + /** \brief Reading values. + + From https://people.scs.fsu.edu/~burkardt/html/off_format.html: + + ``Following these [coordinates] are the face descriptions, + typically written with one line per face. Each has the + form + + N Vert1 Vert2 ... VertN [color] + + Here N is the number of vertices on this face, and Vert1 + through VertN are indices into the list of vertices (in + the range 0..NVertices-1). + + The optional color may take several forms. Line breaks + are significant here: the color description begins after + VertN and ends with the end of the line (or the next # + comment). A color may be: + + nothing + the default color + one integer + index into "the" colormap; see below + three or four integers + RGB and possibly alpha values in the range 0..255 + three or four floating-point numbers + RGB and possibly alpha values in the range 0..1 + + For the one-integer case, the colormap is currently read + from the file `cmap.fmap' in Geomview's `data' + directory. Some better mechanism for supplying a colormap + is likely someday. + + The meaning of "default color" varies. If no face of the + object has a color, all inherit the environment's default + material color. If some but not all faces have colors, the + default is gray (R,G,B,A=.666).'' + + \{ */ + void + bin_off_loader::read_face_data(std::istream& /* istr */) + { + // Do nothing (no data associated to faces). + } + /* \} */ + + + void + bin_off_loader::reserve(unsigned /* nvertices */, + unsigned /* nedges */, + unsigned /* nfaces */) + { + // Do nothing (no data associated to faces). + } + + + void + bin_off_loader::assign(values& vs, const domain& s) + { + // Default values. + for (unsigned i = 0; i <= D; ++i) + vs[i].insert(vs[i].begin(), s.cplx().nfaces(i), true); + } + + + // --------- // + // Helpers. // + // --------- // + + template <typename I, typename E> + inline + std::istream& + off_loader<I, E>::eat_comment(std::istream& istr) { // Skip whitespace and newlines. std::ws(istr); @@ -304,10 +470,13 @@ namespace mln } return istr; } - } + + } // end of namespace mln::io::off::internal + # endif // ! MLN_INCLUDE_ONLY + } // end of namespace mln::io::off } // end of namespace mln::io -- 1.6.0.1