freetype2/src/base/ftoutln.c

/***************************************************************************/
/*                                                                         */
/*  ftoutln.c                                                              */
/*                                                                         */
/*    FreeType outline management (body).                                  */
/*                                                                         */
/*  Copyright 1996-2001 by                                                 */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* All functions are declared in freetype.h.                             */
  /*                                                                       */
  /*************************************************************************/


#include <ft2build.h>
#include FT_OUTLINE_H
#include FT_INTERNAL_OBJECTS_H


  /*************************************************************************/
  /*                                                                       */
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  /* messages during execution.                                            */
  /*                                                                       */
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_outline


  static
  const FT_Outline  null_outline = { 0, 0, 0, 0, 0, 0 };


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Outline_Decompose( FT_Outline*              outline,
                        const FT_Outline_Funcs*  interface,
                        void*                    user )
  {
#undef SCALED
#define SCALED( x )  ( ( (x) << shift ) - delta )

    FT_Vector   v_last;
    FT_Vector   v_control;
    FT_Vector   v_start;

    FT_Vector*  point;
    FT_Vector*  limit;
    char*       tags;

    FT_Error    error;

    FT_Int   n;         /* index of contour in outline     */
    FT_UInt  first;     /* index of first point in contour */
    FT_Int   tag;       /* current point's state           */

    FT_Int   shift;
    FT_Pos   delta;


    if ( !outline || !interface )
      return FT_Err_Invalid_Argument;

    shift = interface->shift;
    delta = interface->delta;
    first = 0;

    for ( n = 0; n < outline->n_contours; n++ )
    {
      FT_Int  last;  /* index of last point in contour */


      last  = outline->contours[n];
      limit = outline->points + last;

      v_start = outline->points[first];
      v_last  = outline->points[last];

      v_start.x = SCALED( v_start.x ); v_start.y = SCALED( v_start.y );
      v_last.x  = SCALED( v_last.x );  v_last.y  = SCALED( v_last.y );

      v_control = v_start;

      point = outline->points + first;
      tags  = outline->tags  + first;
      tag   = FT_CURVE_TAG( tags[0] );

      /* A contour cannot start with a cubic control point! */
      if ( tag == FT_Curve_Tag_Cubic )
        goto Invalid_Outline;

      /* check first point to determine origin */
      if ( tag == FT_Curve_Tag_Conic )
      {
        /* first point is conic control.  Yes, this happens. */
        if ( FT_CURVE_TAG( outline->tags[last] ) == FT_Curve_Tag_On )
        {
          /* start at last point if it is on the curve */
          v_start = v_last;
          limit--;
        }
        else
        {
          /* if both first and last points are conic,         */
          /* start at their middle and record its position    */
          /* for closure                                      */
          v_start.x = ( v_start.x + v_last.x ) / 2;
          v_start.y = ( v_start.y + v_last.y ) / 2;

          v_last = v_start;
        }
        point--;
        tags--;
      }

      error = interface->move_to( &v_start, user );
      if ( error )
        goto Exit;

      while ( point < limit )
      {
        point++;
        tags++;

        tag = FT_CURVE_TAG( tags[0] );
        switch ( tag )
        {
        case FT_Curve_Tag_On:  /* emit a single line_to */
          {
            FT_Vector  vec;


            vec.x = SCALED( point->x );
            vec.y = SCALED( point->y );

            error = interface->line_to( &vec, user );
            if ( error )
              goto Exit;
            continue;
          }

        case FT_Curve_Tag_Conic:  /* consume conic arcs */
          v_control.x = SCALED( point->x );
          v_control.y = SCALED( point->y );

        Do_Conic:
          if ( point < limit )
          {
            FT_Vector  vec;
            FT_Vector  v_middle;


            point++;
            tags++;
            tag = FT_CURVE_TAG( tags[0] );

            vec.x = SCALED( point->x );
            vec.y = SCALED( point->y );

            if ( tag == FT_Curve_Tag_On )
            {
              error = interface->conic_to( &v_control, &vec, user );
              if ( error )
                goto Exit;
              continue;
            }

            if ( tag != FT_Curve_Tag_Conic )
              goto Invalid_Outline;

            v_middle.x = ( v_control.x + vec.x ) / 2;
            v_middle.y = ( v_control.y + vec.y ) / 2;

            error = interface->conic_to( &v_control, &v_middle, user );
            if ( error )
              goto Exit;

            v_control = vec;
            goto Do_Conic;
          }

          error = interface->conic_to( &v_control, &v_start, user );
          goto Close;

        default:  /* FT_Curve_Tag_Cubic */
          {
            FT_Vector  vec1, vec2;


            if ( point + 1 > limit                             ||
                 FT_CURVE_TAG( tags[1] ) != FT_Curve_Tag_Cubic )
              goto Invalid_Outline;

            point += 2;
            tags  += 2;

            vec1.x = SCALED( point[-2].x ); vec1.y = SCALED( point[-2].y );
            vec2.x = SCALED( point[-1].x ); vec2.y = SCALED( point[-1].y );

            if ( point <= limit )
            {
              FT_Vector  vec;


              vec.x = SCALED( point->x );
              vec.y = SCALED( point->y );

              error = interface->cubic_to( &vec1, &vec2, &vec, user );
              if ( error )
                goto Exit;
              continue;
            }

            error = interface->cubic_to( &vec1, &vec2, &v_start, user );
            goto Close;
          }
        }
      }

      /* close the contour with a line segment */
      error = interface->line_to( &v_start, user );

    Close:
      if ( error )
        goto Exit;

      first = last + 1;
    }

    return 0;

  Exit:
    return error;

  Invalid_Outline:
    return FT_Err_Invalid_Outline;
  }


  FT_EXPORT_DEF( FT_Error )
  FT_Outline_New_Internal( FT_Memory    memory,
                           FT_UInt      numPoints,
                           FT_Int       numContours,
                           FT_Outline  *anoutline )
  {
    FT_Error  error;


    if ( !anoutline || !memory )
      return FT_Err_Invalid_Argument;

    *anoutline = null_outline;

    if ( ALLOC_ARRAY( anoutline->points,   numPoints * 2L, FT_Pos    ) ||
         ALLOC_ARRAY( anoutline->tags,     numPoints,      FT_Byte   ) ||
         ALLOC_ARRAY( anoutline->contours, numContours,    FT_UShort ) )
      goto Fail;

    anoutline->n_points    = (FT_UShort)numPoints;
    anoutline->n_contours  = (FT_Short)numContours;
    anoutline->flags      |= ft_outline_owner;

    return FT_Err_Ok;

  Fail:
    anoutline->flags |= ft_outline_owner;
    FT_Outline_Done_Internal( memory, anoutline );

    return error;
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Outline_New( FT_Library   library,
                  FT_UInt      numPoints,
                  FT_Int       numContours,
                  FT_Outline  *anoutline )
  {
    if ( !library )
      return FT_Err_Invalid_Library_Handle;

    return FT_Outline_New_Internal( library->memory, numPoints,
                                    numContours, anoutline );
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Outline_Check( FT_Outline*  outline )
  {
    if ( outline )
    {
      FT_Int  n_points   = outline->n_points;
      FT_Int  n_contours = outline->n_contours;
      FT_Int  end0, end;
      FT_Int  n;


      /* empty glyph? */
      if ( n_points == 0 && n_contours == 0 )
        return 0;

      /* check point and contour counts */
      if ( n_points <= 0 || n_contours <= 0 )
        goto Bad;

      end0 = -1;
      end  = end0;
      for ( n = 0; n < n_contours; n++ )
      {
        end = outline->contours[n];

        /* note that we don't accept empty contours */
        if ( end <= end0 || end >= n_points )
          goto Bad;

        end0 = end;
      }

      if ( end != n_points - 1 )
        goto Bad;

      /* XXX: check the that array */
      return 0;
    }

  Bad:
    return FT_Err_Invalid_Argument;
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Outline_Copy( FT_Outline*  source,
                   FT_Outline  *target )
  {
    FT_Int  is_owner;


    if ( !source            || !target            ||
         source->n_points   != target->n_points   ||
         source->n_contours != target->n_contours )
      return FT_Err_Invalid_Argument;

    MEM_Copy( target->points, source->points,
              source->n_points * sizeof ( FT_Vector ) );

    MEM_Copy( target->tags, source->tags,
              source->n_points * sizeof ( FT_Byte ) );

    MEM_Copy( target->contours, source->contours,
              source->n_contours * sizeof ( FT_Short ) );

    /* copy all flags, except the `ft_outline_owner' one */
    is_owner      = target->flags & ft_outline_owner;
    target->flags = source->flags;

    target->flags &= ~ft_outline_owner;
    target->flags |= is_owner;

    return FT_Err_Ok;
  }


  FT_EXPORT_DEF( FT_Error )
  FT_Outline_Done_Internal( FT_Memory    memory,
                            FT_Outline*  outline )
  {
    if ( outline )
    {
      if ( outline->flags & ft_outline_owner )
      {
        FREE( outline->points   );
        FREE( outline->tags     );
        FREE( outline->contours );
      }
      *outline = null_outline;

      return FT_Err_Ok;
    }
    else
      return FT_Err_Invalid_Argument;
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Outline_Done( FT_Library   library,
                   FT_Outline*  outline )
  {
    /* check for valid `outline' in FT_Outline_Done_Internal() */

    if ( !library )
      return FT_Err_Invalid_Library_Handle;

    return FT_Outline_Done_Internal( library->memory, outline );
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( void )
  FT_Outline_Get_CBox( FT_Outline*  outline,
                       FT_BBox     *acbox )
  {
    FT_Pos  xMin, yMin, xMax, yMax;


    if ( outline && acbox )
    {
      if ( outline->n_points == 0 )
      {
        xMin = 0;
        yMin = 0;
        xMax = 0;
        yMax = 0;
      }
      else
      {
        FT_Vector*  vec   = outline->points;
        FT_Vector*  limit = vec + outline->n_points;


        xMin = xMax = vec->x;
        yMin = yMax = vec->y;
        vec++;

        for ( ; vec < limit; vec++ )
        {
          FT_Pos  x, y;


          x = vec->x;
          if ( x < xMin ) xMin = x;
          if ( x > xMax ) xMax = x;

          y = vec->y;
          if ( y < yMin ) yMin = y;
          if ( y > yMax ) yMax = y;
        }
      }
      acbox->xMin = xMin;
      acbox->xMax = xMax;
      acbox->yMin = yMin;
      acbox->yMax = yMax;
    }
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( void )
  FT_Outline_Translate( FT_Outline*  outline,
                        FT_Pos       xOffset,
                        FT_Pos       yOffset )
  {
    FT_UShort   n;
    FT_Vector*  vec = outline->points;


    for ( n = 0; n < outline->n_points; n++ )
    {
      vec->x += xOffset;
      vec->y += yOffset;
      vec++;
    }
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( void )
  FT_Outline_Reverse( FT_Outline*  outline )
  {
    FT_UShort  n;
    FT_Int     first, last;


    first = 0;

    for ( n = 0; n < outline->n_contours; n++ )
    {
      last  = outline->contours[n];

      /* reverse point table */
      {
        FT_Vector*  p = outline->points + first;
        FT_Vector*  q = outline->points + last;
        FT_Vector   swap;


        while ( p < q )
        {
          swap = *p;
          *p   = *q;
          *q   = swap;
          p++;
          q--;
        }
      }

      /* reverse tags table */
      {
        char*  p = outline->tags + first;
        char*  q = outline->tags + last;
        char   swap;


        while ( p < q )
        {
          swap = *p;
          *p   = *q;
          *q   = swap;
          p++;
          q--;
        }
      }

      first = last + 1;
    }

    outline->flags ^= ft_outline_reverse_fill;
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Outline_Render( FT_Library         library,
                     FT_Outline*        outline,
                     FT_Raster_Params*  params )
  {
    FT_Error     error;
    FT_Bool      update = 0;
    FT_Renderer  renderer;
    FT_ListNode  node;


    if ( !library )
      return FT_Err_Invalid_Library_Handle;

    if ( !params )
      return FT_Err_Invalid_Argument;

    renderer = library->cur_renderer;
    node     = library->renderers.head;

    params->source = (void*)outline;

    error = FT_Err_Cannot_Render_Glyph;
    while ( renderer )
    {
      error = renderer->raster_render( renderer->raster, params );
      if ( !error || FT_ERROR_BASE( error ) != FT_Err_Cannot_Render_Glyph )
        break;

      /* FT_Err_Cannot_Render_Glyph is returned if the render mode   */
      /* is unsupported by the current renderer for this glyph image */
      /* format                                                      */

      /* now, look for another renderer that supports the same */
      /* format                                                */
      renderer = FT_Lookup_Renderer( library, ft_glyph_format_outline,
                                     &node );
      update   = 1;
    }

    /* if we changed the current renderer for the glyph image format */
    /* we need to select it as the next current one                  */
    if ( !error && update && renderer )
      FT_Set_Renderer( library, renderer, 0, 0 );

    return error;
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( FT_Error )
  FT_Outline_Get_Bitmap( FT_Library   library,
                         FT_Outline*  outline,
                         FT_Bitmap   *abitmap )
  {
    FT_Raster_Params  params;


    if ( !abitmap )
      return FT_Err_Invalid_Argument;

    /* other checks are delayed to FT_Outline_Render() */

    params.target = abitmap;
    params.flags  = 0;

    if ( abitmap->pixel_mode == ft_pixel_mode_grays )
      params.flags |= ft_raster_flag_aa;

    return FT_Outline_Render( library, outline, &params );
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( void )
  FT_Vector_Transform( FT_Vector*  vector,
                       FT_Matrix*  matrix )
  {
    FT_Pos xz, yz;


    if ( !vector || !matrix )
      return;

    xz = FT_MulFix( vector->x, matrix->xx ) +
         FT_MulFix( vector->y, matrix->xy );

    yz = FT_MulFix( vector->x, matrix->yx ) +
         FT_MulFix( vector->y, matrix->yy );

    vector->x = xz;
    vector->y = yz;
  }


  /* documentation is in ftoutln.h */

  FT_EXPORT_DEF( void )
  FT_Outline_Transform( FT_Outline*  outline,
                        FT_Matrix*   matrix )
  {
    FT_Vector*  vec = outline->points;
    FT_Vector*  limit = vec + outline->n_points;


    for ( ; vec < limit; vec++ )
      FT_Vector_Transform( vec, matrix );
  }


/* END */