# dlib C++ Library - render_face_detections_abstract.h

    // Copyright (C) 2014  Davis E. King (davis@dlib.net)
    // License: Boost Software License   See LICENSE.txt for the full license.
    #undef DLIB_RENDER_FACE_DeTECTIONS_ABSTRACT_H_
    #ifdef DLIB_RENDER_FACE_DeTECTIONS_ABSTRACT_H_

    #include "full_object_detection_abstract.h"
    #include "../gui_widgets.h"

    namespace dlib
    {

    // ----------------------------------------------------------------------------------------

        inline std::vector<image_window::overlay_line> render_face_detections (
            const std::vector<full_object_detection>& dets,
            const rgb_pixel color = rgb_pixel(0,255,0)
        );
        /*!
            requires
                - for all valid i:
                    - dets[i].num_parts() == 68 || dets[i].num_parts() == 5
            ensures
                - Interprets the given objects as face detections with parts annotated using
                  either the iBUG face landmark scheme or a 5 point face annotation.  We then
                  return a set of overlay lines that will draw the objects onto the screen in a
                  way that properly draws the outline of the face features defined by the part
                  locations.
                - returns a vector with dets.size() elements, each containing the lines
                  necessary to render a face detection from dets.
                - The 5 point face annotation scheme is assumed to be:
                    - det part 0 == left eye corner, outside part of eye.
                    - det part 1 == left eye corner, inside part of eye.
                    - det part 2 == right eye corner, outside part of eye.
                    - det part 3 == right eye corner, inside part of eye.
                    - det part 4 == immediately under the nose, right at the top of the philtrum.
        !*/

    // ----------------------------------------------------------------------------------------

        inline std::vector<image_window::overlay_line> render_face_detections (
            const full_object_detection& det,
            const rgb_pixel color = rgb_pixel(0,255,0)
        );
        /*!
            requires
                - det.num_parts() == 68 || det.num_parts() == 5
            ensures
                - This function is identical to the above render_face_detections() routine
                  except that it takes just a single full_object_detection instead of a
                  std::vector of them.
        !*/

    // ----------------------------------------------------------------------------------------

    }

    #endif // DLIB_RENDER_FACE_DeTECTIONS_ABSTRACT_H_