pshinter.c

ucgui的矢量字库支持包,可以象windows一样使用truetype的字库了

      memory = globals->memory;
      globals->dimension[0].stdw.count = 0;
      globals->dimension[1].stdw.count = 0;

      globals->blues.normal_top.count    = 0;
      globals->blues.normal_bottom.count = 0;
      globals->blues.family_top.count    = 0;
      globals->blues.family_bottom.count = 0;

      FT_FREE( globals );

#ifdef DEBUG_HINTER
      ps_debug_globals = 0;
#endif
    }
  }


  static FT_Error
  psh_globals_new( FT_Memory     memory,
                   T1_Private*   priv,
                   PSH_Globals  *aglobals )
  {
    PSH_Globals  globals;
    FT_Error     error;


    if ( !FT_NEW( globals ) )
    {
      FT_UInt    count;
      FT_Short*  read;


      globals->memory = memory;

      /* copy standard widths */
      {
        PSH_Dimension  dim   = &globals->dimension[1];
        PSH_Width      write = dim->stdw.widths;


        write->org = priv->standard_width[0];
        write++;

        read = priv->snap_widths;
        for ( count = priv->num_snap_widths; count > 0; count-- )
        {
          write->org = *read;
          write++;
          read++;
        }

        dim->stdw.count = priv->num_snap_widths + 1;
      }

      /* copy standard heights */
      {
        PSH_Dimension  dim = &globals->dimension[0];
        PSH_Width      write = dim->stdw.widths;


        write->org = priv->standard_height[0];
        write++;
        read = priv->snap_heights;
        for ( count = priv->num_snap_heights; count > 0; count-- )
        {
          write->org = *read;
          write++;
          read++;
        }

        dim->stdw.count = priv->num_snap_heights + 1;
      }

      /* copy blue zones */
      psh_blues_set_zones( &globals->blues, priv->num_blue_values,
                           priv->blue_values, priv->num_other_blues,
                           priv->other_blues, priv->blue_fuzz, 0 );

      psh_blues_set_zones( &globals->blues, priv->num_family_blues,
                           priv->family_blues, priv->num_family_other_blues,
                           priv->family_other_blues, priv->blue_fuzz, 1 );

      globals->blues.blue_scale = priv->blue_scale;
      globals->blues.blue_shift = priv->blue_shift;
      globals->blues.blue_fuzz  = priv->blue_fuzz;

      globals->dimension[0].scale_mult  = 0;
      globals->dimension[0].scale_delta = 0;
      globals->dimension[1].scale_mult  = 0;
      globals->dimension[1].scale_delta = 0;

#ifdef DEBUG_HINTER
      ps_debug_globals = globals;
#endif
    }

    *aglobals = globals;
    return error;
  }


  FT_LOCAL_DEF( FT_Error )
  psh_globals_set_scale( PSH_Globals  globals,
                         FT_Fixed     x_scale,
                         FT_Fixed     y_scale,
                         FT_Fixed     x_delta,
                         FT_Fixed     y_delta )
  {
    PSH_Dimension  dim = &globals->dimension[0];


    dim = &globals->dimension[0];
    if ( x_scale != dim->scale_mult  ||
         x_delta != dim->scale_delta )
    {
      dim->scale_mult  = x_scale;
      dim->scale_delta = x_delta;

      psh_globals_scale_widths( globals, 0 );
    }

    dim = &globals->dimension[1];
    if ( y_scale != dim->scale_mult  ||
         y_delta != dim->scale_delta )
    {
      dim->scale_mult  = y_scale;
      dim->scale_delta = y_delta;

      psh_globals_scale_widths( globals, 1 );
      psh_blues_scale_zones( &globals->blues, y_scale, y_delta );
    }

    return 0;
  }


  FT_LOCAL_DEF( void )
  psh_globals_funcs_init( PSH_Globals_FuncsRec*  funcs )
  {
    funcs->create    = psh_globals_new;
    funcs->set_scale = psh_globals_set_scale;
    funcs->destroy   = psh_globals_destroy;
  }


/* END */

/***************************************************************************/
/*                                                                         */
/*  pshalgo.c                                                              */
/*                                                                         */
/*    PostScript hinting algorithm (body).                                 */
/*                                                                         */
/*  Copyright 2001, 2002, 2003, 2004, 2005 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.                                        */
/*                                                                         */
/***************************************************************************/


#include "ft2build.h"
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_DEBUG_H
#include "pshalgo.h"

#include "pshnterr.h"


#undef  FT_COMPONENT
#define FT_COMPONENT  trace_pshalgo2


#ifdef DEBUG_HINTER
  PSH_Hint_Table  ps_debug_hint_table = 0;
  PSH_HintFunc    ps_debug_hint_func  = 0;
  PSH_Glyph       ps_debug_glyph      = 0;
#endif


#define  COMPUTE_INFLEXS  /* compute inflection points to optimize `S' */
                          /* and similar glyphs                        */
#define  STRONGER         /* slightly increase the contrast of smooth  */
                          /* hinting                                   */


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                  BASIC HINTS RECORDINGS                       *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  /* return true if two stem hints overlap */
  static FT_Int
  psh_hint_overlap( PSH_Hint  hint1,
                    PSH_Hint  hint2 )
  {
    return hint1->org_pos + hint1->org_len >= hint2->org_pos &&
           hint2->org_pos + hint2->org_len >= hint1->org_pos;
  }


  /* destroy hints table */
  static void
  psh_hint_table_done( PSH_Hint_Table  table,
                       FT_Memory       memory )
  {
    FT_FREE( table->zones );
    table->num_zones = 0;
    table->zone      = 0;

    FT_FREE( table->sort );
    FT_FREE( table->hints );
    table->num_hints   = 0;
    table->max_hints   = 0;
    table->sort_global = 0;
  }


  /* deactivate all hints in a table */
  static void
  psh_hint_table_deactivate( PSH_Hint_Table  table )
  {
    FT_UInt   count = table->max_hints;
    PSH_Hint  hint  = table->hints;


    for ( ; count > 0; count--, hint++ )
    {
      psh_hint_deactivate( hint );
      hint->order = -1;
    }
  }


  /* internal function to record a new hint */
  static void
  psh_hint_table_record( PSH_Hint_Table  table,
                         FT_UInt         idx )
  {
    PSH_Hint  hint = table->hints + idx;


    if ( idx >= table->max_hints )
    {
      FT_ERROR(( "psh_hint_table_record: invalid hint index %d\n", idx ));
      return;
    }

    /* ignore active hints */
    if ( psh_hint_is_active( hint ) )
      return;

    psh_hint_activate( hint );

    /* now scan the current active hint set to check */
    /* whether `hint' overlaps with another hint     */
    {
      PSH_Hint*  sorted = table->sort_global;
      FT_UInt    count  = table->num_hints;
      PSH_Hint   hint2;


      hint->parent = 0;
      for ( ; count > 0; count--, sorted++ )
      {
        hint2 = sorted[0];

        if ( psh_hint_overlap( hint, hint2 ) )
        {
          hint->parent = hint2;
          break;
        }
      }
    }

    if ( table->num_hints < table->max_hints )
      table->sort_global[table->num_hints++] = hint;
    else
      FT_ERROR(( "psh_hint_table_record: too many sorted hints!  BUG!\n" ));
  }


  static void
  psh_hint_table_record_mask( PSH_Hint_Table  table,
                              PS_Mask         hint_mask )
  {
    FT_Int    mask = 0, val = 0;
    FT_Byte*  cursor = hint_mask->bytes;
    FT_UInt   idx, limit;


    limit = hint_mask->num_bits;

    for ( idx = 0; idx < limit; idx++ )
    {
      if ( mask == 0 )
      {
        val  = *cursor++;
        mask = 0x80;
      }

      if ( val & mask )
        psh_hint_table_record( table, idx );

      mask >>= 1;
    }
  }


  /* create hints table */
  static FT_Error
  psh_hint_table_init( PSH_Hint_Table  table,
                       PS_Hint_Table   hints,
                       PS_Mask_Table   hint_masks,
                       PS_Mask_Table   counter_masks,
                       FT_Memory       memory )
  {
    FT_UInt   count;
    FT_Error  error;

    FT_UNUSED( counter_masks );


    count = hints->num_hints;

    /* allocate our tables */
    if ( FT_NEW_ARRAY( table->sort,  2 * count     ) ||
         FT_NEW_ARRAY( table->hints,     count     ) ||
         FT_NEW_ARRAY( table->zones, 2 * count + 1 ) )
      goto Exit;

    table->max_hints   = count;
    table->sort_global = table->sort + count;
    table->num_hints   = 0;
    table->num_zones   = 0;
    table->zone        = 0;

    /* initialize the `table->hints' array */
    {
      PSH_Hint  write = table->hints;
      PS_Hint   read  = hints->hints;


      for ( ; count > 0; count--, write++, read++ )
      {
        write->org_pos = read->pos;
        write->org_len = read->len;
        write->flags   = read->flags;
      }
    }

    /* we now need to determine the initial `parent' stems; first  */
    /* activate the hints that are given by the initial hint masks */
    if ( hint_masks )
    {
      PS_Mask  mask = hint_masks->masks;


      count             = hint_masks->num_masks;
      table->hint_masks = hint_masks;

      for ( ; count > 0; count--, mask++ )
        psh_hint_table_record_mask( table, mask );
    }

    /* finally, do a linear parse in case some hints were left alone */
    if ( table->num_hints != table->max_hints )
    {
      FT_UInt  idx;


      FT_ERROR(( "psh_hint_table_init: missing/incorrect hint masks!\n" ));

      count = table->max_hints;
      for ( idx = 0; idx < count; idx++ )
        psh_hint_table_record( table, idx );
    }

  Exit:
    return error;
  }


  static void
  psh_hint_table_activate_mask( PSH_Hint_Table  table,
                                PS_Mask         hint_mask )
  {
    FT_Int    mask = 0, val = 0;
    FT_Byte*  cursor = hint_mask->bytes;
    FT_UInt   idx, limit, count;


    limit = hint_mask->num_bits;
    count = 0;

    psh_hint_table_deactivate( table );

    for ( idx = 0; idx < limit; idx++ )
    {
      if ( mask == 0 )
      {
        val  = *cursor++;
        mask = 0x80;
      }

      if ( val & mask )
      {
        PSH_Hint  hint = &table->hints[idx];


        if ( !psh_hint_is_active( hint ) )
        {
          FT_UInt     count2;

#if 0
          PSH_Hint*  sort = table->sort;
          PSH_Hint   hint2;


          for ( count2 = count; count2 > 0; count2--, sort++ )
          {
            hint2 = sort[0];
            if ( psh_hint_overlap( hint, hint2 ) )
              FT_ERROR(( "psh_hint_table_activate_mask:"
                         " found overlapping hints\n" ))
          }
#else
          count2 = 0;
#endif

          if ( count2 == 0 )
          {
            psh_hint_activate( hint );
            if ( count < table->max_hints )
              table->sort[count++] = hint;
            else
              FT_ERROR(( "psh_hint_tableactivate_mask:"
                         " too many active hints\n" ));
          }
        }
      }

      mask >>= 1;
    }
    table->num_hints = count;

    /* now, sort the hints; they are guaranteed to not overlap */
    /* so we can compare their "org_pos" field directly        */
    {
      FT_Int     i1, i2;
      PSH_Hint   hint1, hint2;