freetype2/tests/gview.c

#include <nirvana.h>
#include NV_VIEWPORT_H
#include <stdio.h>

#include <ft2build.h>
#include FT_FREETYPE_H

/* include FreeType internals to debug hints */
#include <../src/pshinter/pshrec.h>
#include <../src/pshinter/pshalgo.h>

#include <../src/autohint/ahtypes.h>

 /************************************************************************/
 /************************************************************************/
 /*****                                                              *****/
 /*****                     ROOT DEFINITIONS                         *****/
 /*****                                                              *****/
 /************************************************************************/
 /************************************************************************/


#include <time.h>    /* for clock() */

  /* SunOS 4.1.* does not define CLOCKS_PER_SEC, so include <sys/param.h> */
  /* to get the HZ macro which is the equivalent.                         */
#if defined( __sun__ ) && !defined( SVR4 ) && !defined( __SVR4 )
#include <sys/param.h>
#define CLOCKS_PER_SEC HZ
#endif

static int  first_glyph = 0;

static NV_Renderer   renderer;
static NV_Painter    painter;
static NV_Pixmap     target;
static NV_Error      error;
static NV_Memory     memory;
static NVV_Display   display;
static NVV_Surface   surface;

static FT_Library    freetype;
static FT_Face       face;


static  NV_Pos        glyph_scale;
static  NV_Pos        glyph_org_x;
static  NV_Pos        glyph_org_y;
static  NV_Transform  glyph_transform;  /* font units -> device pixels */
static  NV_Transform  size_transform;   /* subpixels  -> device pixels */

static  NV_Scale      grid_scale = 1.0;

static  int   glyph_index;
static  int   pixel_size = 12;


 /************************************************************************/
 /************************************************************************/
 /*****                                                              *****/
 /*****                 OPTIONS, COLORS and OTHERS                   *****/
 /*****                                                              *****/
 /************************************************************************/
 /************************************************************************/

static  int   option_show_axis     = 1;
static  int   option_show_dots     = 1;
static  int   option_show_stroke   = 0;
static  int   option_show_glyph    = 1;
static  int   option_show_grid     = 1;
static  int   option_show_em       = 0;
static  int   option_show_smooth   = 1;
static  int   option_show_blues    = 0;
static  int   option_show_edges    = 0;
static  int   option_show_segments = 1;
static  int   option_show_links    = 1;
static  int   option_show_indices  = 0;

static  int   option_show_ps_hints   = 1;
static  int   option_show_horz_hints = 1;
static  int   option_show_vert_hints = 1;


static  int   option_hinting = 1;

static  char  temp_message[1024];

static  NV_Path   symbol_dot     = NULL;
static  NV_Path   symbol_circle  = NULL;
static  NV_Path   symbol_square  = NULL;
static  NV_Path   symbol_rect_h  = NULL;
static  NV_Path   symbol_rect_v  = NULL;



#define  AXIS_COLOR        0xFFFF0000
#define  GRID_COLOR        0xFFD0D0D0
#define  ON_COLOR          0xFFFF2000
#define  OFF_COLOR         0xFFFF0080
#define  STRONG_COLOR      0xFF404040
#define  INTERP_COLOR      0xFF206040
#define  SMOOTH_COLOR      0xF000B040
#define  BACKGROUND_COLOR  0xFFFFFFFF
#define  TEXT_COLOR        0xFF000000
#define  EM_COLOR          0x80008000
#define  BLUES_TOP_COLOR   0x4000008F
#define  BLUES_BOT_COLOR   0x40008F00

#define  GHOST_HINT_COLOR  0xE00000FF
#define  STEM_HINT_COLOR   0xE02020FF
#define  STEM_JOIN_COLOR   0xE020FF20

#define  EDGE_COLOR        0xF0704070
#define  SEGMENT_COLOR     0xF0206040
#define  LINK_COLOR        0xF0FFFF00
#define  SERIF_LINK_COLOR  0xF0FF808F


/* print message and abort program */
static void
Panic( const char*  message )
{
  fprintf( stderr, "PANIC: %s\n", message );
  exit(1);
}


static void
init_symbols( void )
{
  nv_path_new_rectangle( renderer, -1, -1, 3, 3, 0, 0, &symbol_square );
  nv_path_new_rectangle( renderer, -1, -6, 2, 12, 0, 0, &symbol_rect_v );
  nv_path_new_rectangle( renderer, -6, -1, 12, 2, 0, 0, &symbol_rect_h );

  nv_path_new_circle( renderer, 0, 0, 3., &symbol_dot );

  nv_path_stroke( symbol_dot, 0.6,
                  nv_path_linecap_butt,
                  nv_path_linejoin_miter, 1.,
                  &symbol_circle );

  nv_path_destroy( symbol_dot );

  nv_path_new_circle( renderer, 0, 0, 2., &symbol_dot );
 }


static void
done_symbols( void )
{
  nv_path_destroy( symbol_circle );
  nv_path_destroy( symbol_dot );
  nv_path_destroy( symbol_rect_v );
  nv_path_destroy( symbol_rect_h );
  nv_path_destroy( symbol_square );
}


  /************************************************************************/
  /************************************************************************/
  /*****                                                              *****/
  /*****               COMMON GRID DRAWING ROUTINES                   *****/
  /*****                                                              *****/
  /************************************************************************/
  /************************************************************************/

static void
reset_scale( NV_Scale  scale )
{
  /* compute font units -> grid pixels scale factor */
  glyph_scale = target->width*0.75 / face->units_per_EM * scale;

  /* setup font units -> grid pixels transform */
  nv_transform_set_scale( &glyph_transform, glyph_scale, -glyph_scale );
  glyph_org_x = glyph_transform.delta.x = target->width*0.125;
  glyph_org_y = glyph_transform.delta.y = target->height*0.875;

  /* setup subpixels -> grid pixels transform */
  nv_transform_set_scale(
    &size_transform,
    glyph_scale / nv_fromfixed( face->size->metrics.x_scale ),
    -glyph_scale / nv_fromfixed( face->size->metrics.y_scale ) );

  size_transform.delta = glyph_transform.delta;
}


static void
reset_size( int       pixel_size,
            NV_Scale  scale )
{
  FT_Set_Pixel_Sizes( face, pixel_size, pixel_size );
  reset_scale( scale );
}


static void
clear_background( void )
{
  nv_pixmap_fill_rect( target, 0, 0, target->width, target->height,
                       BACKGROUND_COLOR );
}


static void
draw_grid( void )
{
  int  x = (int)glyph_org_x;
  int  y = (int)glyph_org_y;


  /* draw grid */
  if ( option_show_grid )
  {
    NV_Scale  min, max, x, step;


    /* draw vertical grid bars */
    step = 64. * size_transform.matrix.xx;
    if ( step > 1. )
    {
      min = max = glyph_org_x;
      while ( min - step >= 0 )             min -= step;
      while ( max + step < target->width )  max += step;

      for ( x = min; x <= max; x += step )
        nv_pixmap_fill_rect( target, (NV_Int)(x + .5), 0,
                             1, target->height, GRID_COLOR );
    }

    /* draw horizontal grid bars */
    step = -64. * size_transform.matrix.yy;
    if ( step > 1. )
    {
      min = max = glyph_org_y;
      while ( min - step >= 0 )              min -= step;
      while ( max + step < target->height )  max += step;

      for ( x = min; x <= max; x += step )
        nv_pixmap_fill_rect( target, 0, (NV_Int)(x + .5),
                             target->width, 1, GRID_COLOR );
    }
  }

  /* draw axis */
  if ( option_show_axis )
  {
    nv_pixmap_fill_rect( target, x, 0, 1, target->height, AXIS_COLOR );
    nv_pixmap_fill_rect( target, 0, y, target->width, 1, AXIS_COLOR );
  }

  if ( option_show_em )
  {
    NV_Path  path;
    NV_Path  stroke;
    NV_UInt  units = (NV_UInt)face->units_per_EM;


    nv_path_new_rectangle( renderer, 0, 0, units, units, 0, 0, &path );
    nv_path_transform( path, &glyph_transform );

    nv_path_stroke( path, 1.5, nv_path_linecap_butt, nv_path_linejoin_miter,
                    4.0, &stroke );

    nv_painter_set_color( painter, EM_COLOR, 256 );
    nv_painter_fill_path( painter, NULL, 0, stroke );

    nv_path_destroy( stroke );
    nv_path_destroy( path );
  }

}


  /************************************************************************/
  /************************************************************************/
  /*****                                                              *****/
  /*****                 POSTSCRIPT GLOBALS ROUTINES                  *****/
  /*****                                                              *****/
  /************************************************************************/
  /************************************************************************/

#include <../src/pshinter/pshglob.h>

static void
draw_ps_blue_zones( void )
{
  if ( option_show_blues && ps_debug_globals )
  {
    PSH_Blues       blues = &ps_debug_globals->blues;
    PSH_Blue_Table  table;
    NV_Vector       v;
    FT_Int          y1, y2;
    FT_UInt         count;
    PSH_Blue_Zone   zone;


    /* draw top zones */
    table = &blues->normal_top;
    count = table->count;
    zone  = table->zones;

    for ( ; count > 0; count--, zone++ )
    {
      v.x = 0;
      if ( !ps_debug_no_horz_hints )
      {
        v.y = zone->cur_ref + zone->cur_delta;
        nv_vector_transform( &v, &size_transform );
      }
      else
      {
        v.y = zone->org_ref + zone->org_delta;
        nv_vector_transform( &v, &glyph_transform );
      }
      y1  = (int)(v.y + 0.5);

      v.x = 0;
      if ( !ps_debug_no_horz_hints )
      {
        v.y = zone->cur_ref;
        nv_vector_transform( &v, &size_transform );
      }
      else
      {
        v.y = zone->org_ref;
        nv_vector_transform( &v, &glyph_transform );
      }
      y2 = (int)(v.y + 0.5);

      nv_pixmap_fill_rect( target, 0, y1,
                           target->width, y2-y1+1,
                           BLUES_TOP_COLOR );

#if 0
      printf( "top [%.3f %.3f]\n", zone->cur_bottom/64.0, zone->cur_top/64.0 );
#endif
    }


    /* draw bottom zones */
    table = &blues->normal_bottom;
    count = table->count;
    zone  = table->zones;

    for ( ; count > 0; count--, zone++ )
    {
      v.x = 0;
      v.y = zone->cur_ref;
      nv_vector_transform( &v, &size_transform );
      y1  = (int)(v.y + 0.5);

      v.x = 0;
      v.y = zone->cur_ref + zone->cur_delta;
      nv_vector_transform( &v, &size_transform );
      y2 = (int)(v.y + 0.5);

      nv_pixmap_fill_rect( target, 0, y1,
                           target->width, y2 - y1 + 1,
                           BLUES_BOT_COLOR );

#if 0
      printf( "bot [%.3f %.3f]\n", zone->cur_bottom/64.0, zone->cur_top/64.0 );
#endif
    }
  }
}


 /************************************************************************/
 /************************************************************************/
 /*****                                                              *****/
 /*****            POSTSCRIPT HINTER ALGORITHM ROUTINES              *****/
 /*****                                                              *****/
 /************************************************************************/
 /************************************************************************/

#include <../src/pshinter/pshalgo.h>

static void
draw_ps_hint( PSH_Hint  hint, 
              FT_Bool   vertical )
{
  int        x1, x2;
  NV_Vector  v;


  if ( pshint_vertical != vertical )
  {
    if ( vertical )
      pshint_cpos = 40;
    else
      pshint_cpos = 10;

    pshint_vertical = vertical;
  }

  if ( !vertical )
  {
    if ( !option_show_vert_hints )
      return;

    v.x = hint->cur_pos;
    v.y = 0;
    nv_vector_transform( &v, &size_transform );
    x1 = (int)(v.x + 0.5);

    v.x = hint->cur_pos + hint->cur_len;
    v.y = 0;
    nv_vector_transform( &v, &size_transform );
    x2 = (int)(v.x + 0.5);

    nv_pixmap_fill_rect( target, x1, 0, 1, target->height,
                         psh_hint_is_ghost( hint )
                         ? GHOST_HINT_COLOR : STEM_HINT_COLOR );

    if ( psh_hint_is_ghost( hint ) )
    {
      x1 --;
      x2 = x1 + 2;
    }
    else
      nv_pixmap_fill_rect( target, x2, 0, 1, target->height,
                           psh_hint_is_ghost( hint )
                           ? GHOST_HINT_COLOR : STEM_HINT_COLOR );

    nv_pixmap_fill_rect( target, x1, pshint_cpos, x2 + 1 - x1, 1,
                         STEM_JOIN_COLOR );
  }
  else
  {
    if ( !option_show_horz_hints )
      return;

    v.y = hint->cur_pos;
    v.x = 0;
    nv_vector_transform( &v, &size_transform );
    x1 = (int)(v.y + 0.5);

    v.y = hint->cur_pos + hint->cur_len;
    v.x = 0;
    nv_vector_transform( &v, &size_transform );
    x2 = (int)(v.y + 0.5);

    nv_pixmap_fill_rect( target, 0, x1, target->width, 1,
                         psh_hint_is_ghost( hint )
                         ? GHOST_HINT_COLOR : STEM_HINT_COLOR );

    if ( psh_hint_is_ghost( hint ) )
    {
      x1 --;
      x2 = x1 + 2;
    }
    else
      nv_pixmap_fill_rect( target, 0, x2, target->width, 1,
                           psh_hint_is_ghost(hint)
                           ? GHOST_HINT_COLOR : STEM_HINT_COLOR );

    nv_pixmap_fill_rect( target, pshint_cpos, x2, 1, x1 + 1 - x2,
                         STEM_JOIN_COLOR );
  }

#if 0
  printf( "[%7.3f %7.3f] %c\n", hint->cur_pos/64.0, (hint->cur_pos+hint->cur_len)/64.0, vertical ? 'v' : 'h' );
#endif

  pshint_cpos += 10;
}


static void
ps_draw_control_points( void )
{
  if ( ps_debug_glyph )
  {
    PSH_Glyph     glyph = ps_debug_glyph;
    PSH_Point     point = glyph->points;
    FT_UInt       count = glyph->num_points;
    NV_Transform  transform, *trans = &transform;
    NV_Path       vert_rect;
    NV_Path       horz_rect;
    NV_Path       dot, circle;


    for ( ; count > 0; count--, point++ )
    {
      NV_Vector  vec;


      vec.x = point->cur_x;
      vec.y = point->cur_y;
      nv_vector_transform( &vec, &size_transform );

      nv_transform_set_translate( trans, vec.x, vec.y );

      if ( option_show_smooth && !psh_point_is_smooth(point) )
      {
        nv_painter_set_color( painter, SMOOTH_COLOR, 256 );
        nv_painter_fill_path( painter, trans, 0, symbol_circle );
      }

      if ( option_show_horz_hints )
      {
        if ( point->flags_y & PSH_POINT_STRONG )
        {
          nv_painter_set_color( painter, STRONG_COLOR, 256 );
          nv_painter_fill_path( painter, trans, 0, symbol_rect_h );
        }
      }

      if ( option_show_vert_hints )
      {
        if ( point->flags_x & PSH_POINT_STRONG )
        {
          nv_painter_set_color( painter, STRONG_COLOR, 256 );
          nv_painter_fill_path( painter, trans, 0, symbol_rect_v );
        }
      }
    }
  }
}


static void
ps_print_hints( void )
{
  if ( ps_debug_hints )
  {
    FT_Int         dimension;


    for ( dimension = 1; dimension >= 0; dimension-- )
    {
      PS_Dimension  dim   = &ps_debug_hints->dimension[ dimension ];
      PS_Mask       mask  = dim->masks.masks;
      FT_UInt       count = dim->masks.num_masks;


      printf( "%s hints -------------------------\n",
              dimension ? "vertical" : "horizontal" );

      for ( ; count > 0; count--, mask++ )
      {
        FT_UInt  index;


        printf( "mask -> %d\n", mask->end_point );
        for ( index = 0; index < mask->num_bits; index++ )
        {
          if ( mask->bytes[ index >> 3 ] & (0x80 >> (index & 7)) )
          {
            PS_Hint  hint = dim->hints.hints + index;


            printf( "%c [%3d %3d (%4d)]\n", dimension ? "v" : "h",
                    hint->pos, hint->pos + hint->len, hint->len );
          }
        }
      }
    }
  }
}


  /************************************************************************/
  /************************************************************************/
  /*****                                                              *****/
  /*****            AUTOHINTER DRAWING ROUTINES                       *****/
  /*****                                                              *****/
  /************************************************************************/
  /************************************************************************/

static NV_Path
ah_link_path( NV_Vector*  p1,
              NV_Vector*  p4,
              NV_Bool     vertical )
{
  NV_PathWriter  writer;
  NV_Vector      p2, p3;
  NV_Path        path, stroke;


  if ( vertical )
  {
    p2.x = p4->x;
    p2.y = p1->y;

    p3.x = p1->x;
    p3.y = p4->y;
  }
  else
  {
    p2.x = p1->x;
    p2.y = p4->y;

    p3.x = p4->x;
    p3.y = p1->y;
  }

  nv_path_writer_new( renderer, &writer );
  nv_path_writer_moveto( writer, p1 );
  nv_path_writer_cubicto( writer, &p2, &p3, p4 );
  nv_path_writer_end( writer );

  path = nv_path_writer_get_path( writer );
  nv_path_writer_destroy( writer );

  nv_path_stroke( path, 1.,
                  nv_path_linecap_butt, nv_path_linejoin_round,
                  1., &stroke );

  nv_path_destroy( path );

  return stroke;
}


static void
ah_draw_smooth_points( void )
{
  if ( ah_debug_hinter && option_show_smooth )
  {
    AH_Outline   glyph = ah_debug_hinter->glyph;
    FT_UInt      count = glyph->num_points;
    AH_Point     point = glyph->points;


    nv_painter_set_color( painter, SMOOTH_COLOR, 256 );

    for ( ; count > 0; count--, point++ )
    {
      if ( !( point->flags & AH_FLAG_WEAK_INTERPOLATION ) )
      {
        NV_Transform  transform, *trans = &transform;
        NV_Vector     vec;


        vec.x = point->x - ah_debug_hinter->pp1.x;
        vec.y = point->y;
        nv_vector_transform( &vec, &size_transform );

        nv_transform_set_translate( &transform, vec.x, vec.y );
        nv_painter_fill_path( painter, trans, 0, symbol_circle );
      }
    }
  }
}


static void
ah_draw_edges( void )
{
  if ( ah_debug_hinter )
  {
    AH_Outline  glyph = ah_debug_hinter->glyph;
    FT_UInt     count;
    AH_Edge     edge;
    FT_Pos      pp1 = ah_debug_hinter->pp1.x;


    nv_painter_set_color( painter, EDGE_COLOR, 256 );

    if ( option_show_edges )
    {
      /* draw vertical edges */
      if ( option_show_vert_hints )
      {
        count = glyph->num_vedges;
        edge  = glyph->vert_edges;
        for ( ; count > 0; count--, edge++ )
        {
          NV_Vector  vec;
          NV_Pos     x;


          vec.x = edge->pos - pp1;
          vec.y = 0;

          nv_vector_transform( &vec, &size_transform );
          x = (FT_Pos)( vec.x + 0.5 );

          nv_pixmap_fill_rect( target, x, 0, 1, target->height, EDGE_COLOR );
        }
      }

      /* draw horizontal edges */
      if ( option_show_horz_hints )
      {
        count = glyph->num_hedges;
        edge  = glyph->horz_edges;
        for ( ; count > 0; count--, edge++ )
        {
          NV_Vector  vec;
          NV_Pos     x;


          vec.x = 0;
          vec.y = edge->pos;

          nv_vector_transform( &vec, &size_transform );
          x = (FT_Pos)( vec.y + 0.5 );

          nv_pixmap_fill_rect( target, 0, x, target->width, 1, EDGE_COLOR );
        }
      }
    }

    if ( option_show_segments )
    {
      /* draw vertical segments */
      if ( option_show_vert_hints )
      {
        AH_Segment  seg   = glyph->vert_segments;
        FT_UInt     count = glyph->num_vsegments;


        for ( ; count > 0; count--, seg++ )
        {
          AH_PointRec  *first, *last;
          NV_Vector  v1, v2;
          NV_Pos     y1, y2, x;


          first = seg->first;
          last  = seg->last;

          v1.x = v2.x = first->x - pp1;

          if ( first->y <= last->y )
          {
            v1.y = first->y;
            v2.y = last->y;
          }
          else
          {
            v1.y = last->y;
            v2.y = first->y;
          }

          nv_vector_transform( &v1, &size_transform );
          nv_vector_transform( &v2, &size_transform );

          y1 = (NV_Pos)( v1.y + 0.5 );
          y2 = (NV_Pos)( v2.y + 0.5 );
          x  = (NV_Pos)( v1.x + 0.5 );

          nv_pixmap_fill_rect( target, x - 1, y2, 3,
                               ABS( y1 - y2 ) + 1, SEGMENT_COLOR );
        }
      }

      /* draw horizontal segments */
      if ( option_show_horz_hints )
      {
        AH_Segment  seg   = glyph->horz_segments;
        FT_UInt     count = glyph->num_hsegments;


        for ( ; count > 0; count--, seg++ )
        {
          AH_PointRec  *first, *last;
          NV_Vector    v1, v2;
          NV_Pos       y1, y2, x;


          first = seg->first;
          last  = seg->last;

          v1.y = v2.y = first->y;

          if ( first->x <= last->x )
          {
            v1.x = first->x - pp1;
            v2.x = last->x - pp1;
          }
          else
          {
            v1.x = last->x - pp1;
            v2.x = first->x - pp1;
          }

          nv_vector_transform( &v1, &size_transform );
          nv_vector_transform( &v2, &size_transform );

          y1 = (NV_Pos)( v1.x + 0.5 );
          y2 = (NV_Pos)( v2.x + 0.5 );
          x  = (NV_Pos)( v1.y + 0.5 );

          nv_pixmap_fill_rect( target, y1, x - 1,
                               ABS( y1 - y2 ) + 1, 3, SEGMENT_COLOR );
        }
      }

      if ( option_show_vert_hints && option_show_links )
      {
        AH_Segment  seg   = glyph->vert_segments;
        FT_UInt     count = glyph->num_vsegments;


        for ( ; count > 0; count--, seg++ )
        {
          AH_Segment  seg2 = NULL;
          NV_Path     link;
          NV_Vector   v1, v2;


          if ( seg->link )
          {
            if ( seg->link > seg )
              seg2 = seg->link;
          }
          else if ( seg->serif )
            seg2 = seg->serif;

          if ( seg2 )
          {
            v1.x = seg->first->x  - pp1;
            v2.x = seg2->first->x - pp1;
            v1.y = ( seg->first->y + seg->last->y ) / 2;
            v2.y = ( seg2->first->y + seg2->last->y ) / 2;

            link = ah_link_path( &v1, &v2, 1 );

            nv_painter_set_color( painter,
                                  seg->serif ? SERIF_LINK_COLOR : LINK_COLOR,
                                  256 );
            nv_painter_fill_path( painter, &size_transform, 0, link );

            nv_path_destroy( link );
          }
        }
      }

      if ( option_show_horz_hints && option_show_links )
      {
        AH_Segment  seg   = glyph->horz_segments;
        FT_UInt     count = glyph->num_hsegments;


        for ( ; count > 0; count--, seg++ )
        {
          AH_Segment  seg2 = NULL;
          NV_Path     link;
          NV_Vector   v1, v2;


          if ( seg->link )
          {
            if ( seg->link > seg )
              seg2 = seg->link;
          }
          else if ( seg->serif )
            seg2 = seg->serif;

          if ( seg2 )
          {
            v1.y = seg->first->y;
            v2.y = seg2->first->y;
            v1.x = ( seg->first->x + seg->last->x ) / 2 - pp1;
            v2.x = ( seg2->first->x + seg2->last->x ) / 2 - pp1;

            link = ah_link_path( &v1, &v2, 0 );

            nv_painter_set_color( painter,
                                  seg->serif ? SERIF_LINK_COLOR : LINK_COLOR,
                                  256 );
            nv_painter_fill_path( painter, &size_transform, 0, link );

            nv_path_destroy( link );
          }
        }
      }
    }
  }
}


  /************************************************************************/
  /************************************************************************/
  /*****                                                              *****/
  /*****                        MAIN LOOP(S)                          *****/
  /*****                                                              *****/
  /************************************************************************/
  /************************************************************************/

static void
draw_glyph( int  glyph_index )
{
  NV_Path   path;


  pshint_vertical = -1;

  ps_debug_hint_func = option_show_ps_hints ? draw_ps_hint : 0;

  ah_debug_hinter = NULL;

  error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_BITMAP );
  if ( error )
    Panic( "could not load glyph" );

  if ( face->glyph->format != FT_GLYPH_FORMAT_OUTLINE )
    Panic( "could not load glyph outline" );

  error = nv_path_new_from_outline( renderer,
                                    (NV_Outline*)&face->glyph->outline,
                                    &size_transform,
                                    &path );
  if ( error )
    Panic( "could not create glyph path" );

  /* trac<61> du glyphe plein */
  if ( option_show_glyph )
  {
    nv_painter_set_color( painter, 0xFF404080, 128 );
    nv_painter_fill_path( painter, 0, 0, path );
  }

  if ( option_show_stroke )
  {
    NV_Path  stroke;


    error = nv_path_stroke( path, 0.6,
                            nv_path_linecap_butt,
                            nv_path_linejoin_miter,
                            1.0, &stroke );
    if ( error )
      Panic( "could not stroke glyph path" );

    nv_painter_set_color( painter, 0xFF000040, 256 );
    nv_painter_fill_path( painter, 0, 0, stroke );

    nv_path_destroy( stroke );
  }

  /* trac<61> des points de controle */
  if ( option_show_dots )
  {
    NV_Path     plot;
    NV_Outline  out;
    NV_Scale    r = 2;
    NV_Int      n, first, last;


    nv_path_get_outline( path, NULL, memory, &out );

    first = 0;
    for ( n = 0; n < out.n_contours; n++ )
    {
      int            m;
      NV_Transform   trans;
      NV_Color       color;
      NV_SubVector*  vec;


      last  = out.contours[n];

      for ( m = first; m <= last; m++ )
      {
        color = (out.tags[m] & FT_CURVE_TAG_ON)
              ? ON_COLOR
              : OFF_COLOR;

        vec = out.points + m;

        nv_transform_set_translate( &trans, vec->x / 64.0, vec->y / 64.0 );

        nv_painter_set_color( painter, color, 256 );
        nv_painter_fill_path( painter, &trans, 0, symbol_dot );

        if ( option_show_indices )
        {
          char  temp[5];


          sprintf( temp, "%d", m );
          nv_pixmap_cell_text( target, vec->x / 64 + 4, vec->y / 64 - 4,
                               temp, TEXT_COLOR );
        }
      }

      first = last + 1;
    }
  }

  ah_draw_smooth_points();
  ah_draw_edges();

  nv_path_destroy( path );

  /* autre infos */
  {
    char  temp[1024];
    char  temp2[64];


    sprintf( temp, "font name : %s (%s)", face->family_name,
                                          face->style_name );
    nv_pixmap_cell_text( target, 0, 0, temp, TEXT_COLOR );

    FT_Get_Glyph_Name( face, glyph_index, temp2, 63 );
    temp2[63] = 0;

    sprintf( temp, "glyph %4d: %s", glyph_index, temp2 );
    nv_pixmap_cell_text( target, 0, 8, temp, TEXT_COLOR );

    if ( temp_message[0] )
    {
      nv_pixmap_cell_text( target, 0, 16, temp_message, TEXT_COLOR );
      temp_message[0] = 0;
    }
  }
}


#define  TOGGLE_OPTION(var,prefix)                           \
            do                                               \
            {                                                \
              var = !var;                                    \
              sprintf( temp_message, prefix " is now %s",    \
                       var ? "on" : "off" );                 \
            }                                                \
            while()


#define  TOGGLE_OPTION_NEG(var,prefix)                       \
            do                                               \
            {                                                \
              var = !var;                                    \
              sprintf( temp_message, prefix " is now %s",    \
                       !var ? "on" : "off" );                \
            }                                                \
            while


static void
handle_event( NVV_EventRec*  ev )
{
  switch ( ev->key )
  {
  case NVV_Key_Left:
    if ( glyph_index > 0 )
      glyph_index--;
    break;

  case NVV_Key_Right:
    if ( glyph_index + 1 < face->num_glyphs )
      glyph_index++;
    break;

  case NVV_KEY( 'x' ):
    TOGGLE_OPTION( option_show_axis, "grid axis display" );
    break;

  case NVV_KEY( 's' ):
    TOGGLE_OPTION( option_show_stroke, "glyph stroke display" );
    break;

  case NVV_KEY( 'g' ):
    TOGGLE_OPTION( option_show_glyph, "glyph fill display" );
    break;

  case NVV_KEY( 'd' ):
    TOGGLE_OPTION( option_show_dots, "control points display" );
    break

  case NVV_KEY( 'e' ):
    TOGGLE_OPTION( option_show_em, "EM square display" );
    break;

  case NVV_KEY( '+' ):
    grid_scale *= 1.2;
    reset_scale( grid_scale );
    break;

  case NVV_KEY( '-' ):
    if ( grid_scale > 0.3 )
    {
      grid_scale /= 1.2;
      reset_scale( grid_scale );
    }
    break;

  case NVV_Key_Up:
    pixel_size++;
    reset_size( pixel_size, grid_scale );
    sprintf( temp_message, "pixel size = %d", pixel_size );
    break;

  case NVV_Key_Down:
    if ( pixel_size > 1 )
    {
      pixel_size--;
      reset_size( pixel_size, grid_scale );
      sprintf( temp_message, "pixel size = %d", pixel_size );
    }
    break;

  case NVV_KEY( 'z' ):
    TOGGLE_OPTION_NEG( ps_debug_no_vert_hints, "vertical hints processing" );
    break;

  case NVV_KEY( 'a' ):
    TOGGLE_OPTION_NEG( ps_debug_no_horz_hints, "horizontal hints processing" );
    break;

  case NVV_KEY( 'Z' ):
    TOGGLE_OPTION( option_show_vert_hints, "vertical hints display" );
    break;

  case NVV_KEY( 'A' ):
    TOGGLE_OPTION( option_show_horz_hints, "horizontal hints display" );
    break;

  case NVV_KEY( 'S' ):
    TOGGLE_OPTION( option_show_smooth, "smooth points display" );
    break;

  case NVV_KEY( 'i' ):
    TOGGLE_OPTION( option_show_indices, "point index display" );
    break;

  case NVV_KEY( 'b' ):
    TOGGLE_OPTION( option_show_blues, "blue zones display" );
    break;

  case NVV_KEY( 'h' ):
    ps_debug_no_horz_hints = option_hinting;
    ps_debug_no_vert_hints = option_hinting;

    TOGGLE_OPTION( option_hinting, "hinting" );
    break;

  case NVV_KEY( 'H' ):
    ps_print_hints();
    break;

  default:
    ;
  }
}


static void
usage()
{
  Panic( "no usage" );
}


#define  OPTION1(n,code)   \
           case n :        \
             code          \
             argc--;       \
             argv++;       \
             break;

#define  OPTION2(n,code)     \
           case n :          \
             code            \
             argc -= 2;      \
             argv += 2;      \
             break;


static void
parse_options( int*     argc_p,
               char***  argv_p )
{
  int     argc = *argc_p;
  char**  argv = *argv_p;


  while ( argc > 2 && argv[1][0] == '-' )
  {
    switch ( argv[1][1] )
    {
      OPTION2( 'f', first_glyph = atoi( argv[2] ); )

      OPTION2( 's', pixel_size = atoi( argv[2] ); )

      default:
        usage();
    }
  }

  *argc_p = argc;
  *argv_p = argv;
}


int
main( int     argc,
      char**  argv )
{
  char*  filename = "/winnt/fonts/arial.ttf";


  parse_options( &argc, &argv );

  if ( argc >= 2 )
    filename = argv[1];


  /* create library */
  error = nv_renderer_new( 0, &renderer );
  if ( error )
    Panic( "could not create Nirvana renderer" );

  memory = nv_renderer_get_memory( renderer );
  init_symbols();

  error = nvv_display_new( renderer, &display );
  if ( error )
    Panic( "could not create display" );

  error = nvv_surface_new( display, 460, 460, nv_pixmap_type_argb, &surface );
  if ( error )
    Panic( "could not create surface" );

  target = nvv_surface_get_pixmap( surface );

  error = nv_painter_new( renderer, &painter );
  if ( error )
    Panic( "could not create painter" );

  nv_painter_set_target( painter, target );

  clear_background();

  error = FT_Init_FreeType( &freetype );
  if ( error )
    Panic( "could not initialize FreeType" );

  error = FT_New_Face( freetype, filename, 0, &face );
  if ( error )
    Panic( "could not open font face" );

  reset_size( pixel_size, grid_scale );

  nvv_surface_set_title( surface, "FreeType Glyph Viewer" );

  {
    NVV_EventRec  event;


    glyph_index = first_glyph;
    for ( ;; )
    {
      clear_background();
      draw_grid();

      ps_debug_hints  = 0;
      ah_debug_hinter = 0;

      ah_debug_disable_vert = ps_debug_no_vert_hints;
      ah_debug_disable_horz = ps_debug_no_horz_hints;

      draw_ps_blue_zones();
      draw_glyph( glyph_index );
      ps_draw_control_points();

      nvv_surface_refresh( surface, NULL );

      nvv_surface_listen( surface, 0, &event );
      if ( event.key == NVV_Key_Esc )
        break;

      handle_event( &event );
      switch ( event.key )
      {
      case NVV_Key_Esc:
        goto Exit;

      default:
        ;
      }
    }
  }

Exit:
  /* wait for escape */

  /* destroy display (and surface) */
  nvv_display_unref( display );

  done_symbols();
  nv_renderer_unref( renderer );

  return 0;
}