[Olena-patches] 2848: Add a loading routine for floating-point value 2-complex images.

* mln/io/off/load.hh (mln::io::off::internal::float_off_loader): New class. (mln::io::off::load(float_2complex_image3df&, const std::string&)): New. --- milena/ChangeLog | 9 +++++ milena/mln/io/off/load.hh | 78 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 87 insertions(+), 0 deletions(-) diff --git a/milena/ChangeLog b/milena/ChangeLog index 02fdd91..bb16376 100644 --- a/milena/ChangeLog +++ b/milena/ChangeLog @@ -1,5 +1,14 @@ 2008-11-12 Roland Levillain &lt;roland(a)lrde.epita.fr&gt; + Add a loading routine for floating-point value 2-complex images. + + * mln/io/off/load.hh + (mln::io::off::internal::float_off_loader): New class. + (mln::io::off::load(float_2complex_image3df&, const std::string&)): + New. + +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 diff --git a/milena/mln/io/off/load.hh b/milena/mln/io/off/load.hh index 4e9e86d..5bfebf3 100644 --- a/milena/mln/io/off/load.hh +++ b/milena/mln/io/off/load.hh @@ -63,6 +63,16 @@ namespace mln existence of faces. */ void load(bin_2complex_image3df& ima, const std::string& filename); + /** \brief Load a floating-point OFF image into a complex image. + + \param[out] ima A reference to the image to construct. + \param[in] filename The name of the file to load. + + Read floating-point data is attached to 2-faces only; + 1-faces and 0-faces are set to 0.0f. */ + void load(float_2complex_image3df& ima, const std::string& filename); + + namespace internal { @@ -107,6 +117,23 @@ namespace mln void reserve(unsigned nvertices, unsigned nedges, unsigned nfaces); }; + + struct float_off_loader + : public off_loader< float_2complex_image3df, float_off_loader > + { + /// \brief Read face data. + void read_face_data(std::istream& istr); + + /// \brief Pre-allocate data. + void reserve(unsigned nvertices, unsigned nedges, unsigned nfaces); + + /// \brief Assign values to image. + void assign(values& vs, const domain& s); + + /// \brief 2-face floating-point values. + std::vector<float> face_value; + }; + } // end of namespace mln::io::off::internal @@ -125,6 +152,14 @@ namespace mln trace::exiting("mln::io::off::load"); } + void + load(float_2complex_image3df& ima, const std::string& filename) + { + trace::entering("mln::io::off::load"); + internal::float_off_loader()(ima, filename); + trace::exiting("mln::io::off::load"); + } + /*-------------------------. | Actual implementations. | @@ -425,6 +460,31 @@ namespace mln { // Do nothing (no data associated to faces). } + + void + float_off_loader::read_face_data(std::istream& istr) + { + /* We just use R and ignore G, B and A (transparency) when + considering the value (``color'') associated to a face as + a (scalar) floating-point value (though it really is an + RGB triplet). + + To ensure consistency, we /might/ (later) check that R, G + and B are equal---or better, ``almost equal'', as they + are floats. + + Moreover, R must (and G, B and A should) be + floating-point values between 0 and 1, according to the + OFF file format definition. */ + // FIXME: `A' should be optional. + float r, g, b, a; + istr >> r >> g >> b >> a; + mln_assertion(0.0f <= r); mln_assertion(r <= 1.0f); + mln_assertion(0.0f <= g); mln_assertion(g <= 1.0f); + mln_assertion(0.0f <= b); mln_assertion(b <= 1.0f); + mln_assertion(0.0f <= a); mln_assertion(a <= 1.0f); + face_value.push_back(r); + } /* \} */ @@ -436,6 +496,14 @@ namespace mln // Do nothing (no data associated to faces). } + void + float_off_loader::reserve(unsigned /* nvertices */, + unsigned /* nedges */, + unsigned nfaces) + { + face_value.reserve(nfaces); + } + void bin_off_loader::assign(values& vs, const domain& s) @@ -445,6 +513,16 @@ namespace mln vs[i].insert(vs[i].begin(), s.cplx().nfaces(i), true); } + void + float_off_loader::assign(values& vs, const domain& s) + { + // Default values for n-face with n in [0, D[. + for (unsigned i = 0; i < D; ++i) + vs[i].insert(vs[i].begin(), s.cplx().nfaces(i), 0.0f); + // Values for D-faces. + vs[D] = face_value; + } + // --------- // // Helpers. // -- 1.6.0.1