text: /* ============================================================================
   * Freetype GL - A C OpenGL Freetype engine
   * Platform:    Any
   * WWW:         https://github.com/rougier/freetype-gl
   * ----------------------------------------------------------------------------
   * Copyright 2011,2012,2013 Nicolas P. Rougier. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   *  1. Redistributions of source code must retain the above copyright notice,
   *     this list of conditions and the following disclaimer.
   *
   *  2. Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY NICOLAS P. ROUGIER ''AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
   * EVENT SHALL NICOLAS P. ROUGIER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * The views and conclusions contained in the software and documentation are
   * those of the authors and should not be interpreted as representing official
   * policies, either expressed or implied, of Nicolas P. Rougier.
   * ----------------------------------------------------------------------------
   */
  #ifndef __DISTANCE_FIELD_H__
  #define __DISTANCE_FIELD_H__
  
  #ifdef __cplusplus
  extern "C" {
  namespace ftgl {
  #endif
  
  /**
   * @file   shader.h
   * @author Nicolas Rougier (Nicolas.Rougier@inria.fr)
   *
   * @defgroup distance-field Distance Field
   *
   * Functions to calculate signed distance fields for bitmaps.
   *
   * <b>Example Usage</b>:
   * @code
   * #include "distance-field.h"
   *
   * int main( int arrgc, char *argv[] )
   * {
   *     int width = 512;
   *     int height = 512;
   *     unsigned char *image = create_greyscale_image(width, height);
   *
   *     image = make_distance_map( image, width, height );
   *
   *     return 0;
   * }
   * @endcode
   *
   * @{
   */
  
  /**
   * Create a distance file from the given image.
   *
   * @param img     A greyscale image.
   * @param width   The width of the given image.
   * @param height  The height of the given image.
   *
   * @return        A newly allocated distance field.  This image must
   *                be freed after usage.
   *
   */
  double *
  make_distance_mapd( double *img,
                      unsigned int width, unsigned int height );
  
  unsigned char *
  make_distance_mapb( unsigned char *img,
                      unsigned int width, unsigned int height );
  
  /** @} */
  
  #ifdef __cplusplus
  }
  }
  #endif
  
  #endif /* __DISTANCE_FIELD_H__ */
  