pfrobjs.c

winNT技术操作系统,国外开放的原代码和LIUX一样

/***************************************************************************/
/*                                                                         */
/*  pfrobjs.c                                                              */
/*                                                                         */
/*    FreeType PFR object methods (body).                                  */
/*                                                                         */
/*  Copyright 2002, 2003, 2004, 2005, 2006, 2007 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 "pfrobjs.h"
#include "pfrload.h"
#include "pfrgload.h"
#include "pfrcmap.h"
#include "pfrsbit.h"
#include FT_OUTLINE_H
#include FT_INTERNAL_DEBUG_H

#include "pfrerror.h"

#undef  FT_COMPONENT
#define FT_COMPONENT  trace_pfr


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                     FACE OBJECT METHODS                       *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_LOCAL_DEF( void )
  pfr_face_done( FT_Face  pfrface )     /* PFR_Face */
  {
    PFR_Face   face   = (PFR_Face)pfrface;
    FT_Memory  memory = pfrface->driver->root.memory;


    /* we don't want dangling pointers */
    pfrface->family_name = NULL;
    pfrface->style_name  = NULL;

    /* finalize the physical font record */
    pfr_phy_font_done( &face->phy_font, FT_FACE_MEMORY( face ) );

    /* no need to finalize the logical font or the header */
    FT_FREE( pfrface->available_sizes );
  }


  FT_LOCAL_DEF( FT_Error )
  pfr_face_init( FT_Stream      stream,
                 FT_Face        pfrface,
                 FT_Int         face_index,
                 FT_Int         num_params,
                 FT_Parameter*  params )
  {
    PFR_Face  face = (PFR_Face)pfrface;
    FT_Error  error;

    FT_UNUSED( num_params );
    FT_UNUSED( params );


    /* load the header and check it */
    error = pfr_header_load( &face->header, stream );
    if ( error )
      goto Exit;

    if ( !pfr_header_check( &face->header ) )
    {
      FT_TRACE4(( "pfr_face_init: not a valid PFR font\n" ));
      error = PFR_Err_Unknown_File_Format;
      goto Exit;
    }

    /* check face index */
    {
      FT_UInt  num_faces;


      error = pfr_log_font_count( stream,
                                  face->header.log_dir_offset,
                                  &num_faces );
      if ( error )
        goto Exit;

      pfrface->num_faces = num_faces;
    }

    if ( face_index < 0 )
      goto Exit;

    if ( face_index >= pfrface->num_faces )
    {
      FT_ERROR(( "pfr_face_init: invalid face index\n" ));
      error = PFR_Err_Invalid_Argument;
      goto Exit;
    }

    /* load the face */
    error = pfr_log_font_load(
               &face->log_font, stream, face_index,
               face->header.log_dir_offset,
               FT_BOOL( face->header.phy_font_max_size_high != 0 ) );
    if ( error )
      goto Exit;

    /* now load the physical font descriptor */
    error = pfr_phy_font_load( &face->phy_font, stream,
                               face->log_font.phys_offset,
                               face->log_font.phys_size );
    if ( error )
      goto Exit;

    /* now set up all root face fields */
    {
      PFR_PhyFont  phy_font = &face->phy_font;


      pfrface->face_index = face_index;
      pfrface->num_glyphs = phy_font->num_chars + 1;
      pfrface->face_flags = FT_FACE_FLAG_SCALABLE;

      /* if all characters point to the same gps_offset 0, we */
      /* assume that the font only contains bitmaps           */
      {
        FT_UInt  nn;


        for ( nn = 0; nn < phy_font->num_chars; nn++ )
          if ( phy_font->chars[nn].gps_offset != 0 )
            break;

        if ( nn == phy_font->num_chars )
          pfrface->face_flags = 0;        /* not scalable */
      }

      if ( (phy_font->flags & PFR_PHY_PROPORTIONAL) == 0 )
        pfrface->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;

      if ( phy_font->flags & PFR_PHY_VERTICAL )
        pfrface->face_flags |= FT_FACE_FLAG_VERTICAL;
      else
        pfrface->face_flags |= FT_FACE_FLAG_HORIZONTAL;

      if ( phy_font->num_strikes > 0 )
        pfrface->face_flags |= FT_FACE_FLAG_FIXED_SIZES;

      if ( phy_font->num_kern_pairs > 0 )
        pfrface->face_flags |= FT_FACE_FLAG_KERNING;

      /* If no family name was found in the "undocumented" auxiliary
       * data, use the font ID instead.  This sucks but is better than
       * nothing.
       */
      pfrface->family_name = phy_font->family_name;
      if ( pfrface->family_name == NULL )
        pfrface->family_name = phy_font->font_id;

      /* note that the style name can be NULL in certain PFR fonts,
       * probably meaning "Regular"
       */
      pfrface->style_name = phy_font->style_name;

      pfrface->num_fixed_sizes = 0;
      pfrface->available_sizes = 0;

      pfrface->bbox         = phy_font->bbox;
      pfrface->units_per_EM = (FT_UShort)phy_font->outline_resolution;
      pfrface->ascender     = (FT_Short) phy_font->bbox.yMax;
      pfrface->descender    = (FT_Short) phy_font->bbox.yMin;

      pfrface->height = (FT_Short)( ( pfrface->units_per_EM * 12 ) / 10 );
      if ( pfrface->height < pfrface->ascender - pfrface->descender )
        pfrface->height = (FT_Short)(pfrface->ascender - pfrface->descender);

      if ( phy_font->num_strikes > 0 )
      {
        FT_UInt          n, count = phy_font->num_strikes;
        FT_Bitmap_Size*  size;
        PFR_Strike       strike;
        FT_Memory        memory = pfrface->stream->memory;


        if ( FT_NEW_ARRAY( pfrface->available_sizes, count ) )
          goto Exit;

        size   = pfrface->available_sizes;
        strike = phy_font->strikes;
        for ( n = 0; n < count; n++, size++, strike++ )
        {
          size->height = (FT_UShort)strike->y_ppm;
          size->width  = (FT_UShort)strike->x_ppm;
          size->size   = strike->y_ppm << 6;
          size->x_ppem = strike->x_ppm << 6;
          size->y_ppem = strike->y_ppm << 6;
        }
        pfrface->num_fixed_sizes = count;
      }

      /* now compute maximum advance width */
      if ( ( phy_font->flags & PFR_PHY_PROPORTIONAL ) == 0 )
        pfrface->max_advance_width = (FT_Short)phy_font->standard_advance;
      else
      {
        FT_Int    max = 0;
        FT_UInt   count = phy_font->num_chars;
        PFR_Char  gchar = phy_font->chars;


        for ( ; count > 0; count--, gchar++ )
        {
          if ( max < gchar->advance )
            max = gchar->advance;
        }

        pfrface->max_advance_width = (FT_Short)max;
      }

      pfrface->max_advance_height = pfrface->height;

      pfrface->underline_position  = (FT_Short)( -pfrface->units_per_EM / 10 );
      pfrface->underline_thickness = (FT_Short)(  pfrface->units_per_EM / 30 );

      /* create charmap */
      {
        FT_CharMapRec  charmap;


        charmap.face        = pfrface;
        charmap.platform_id = 3;
        charmap.encoding_id = 1;
        charmap.encoding    = FT_ENCODING_UNICODE;

        FT_CMap_New( &pfr_cmap_class_rec, NULL, &charmap, NULL );

#if 0
        /* Select default charmap */
        if ( pfrface->num_charmaps )
          pfrface->charmap = pfrface->charmaps[0];
#endif
      }

      /* check whether we've loaded any kerning pairs */
      if ( phy_font->num_kern_pairs )
        pfrface->face_flags |= FT_FACE_FLAG_KERNING;
    }

  Exit:
    return error;
  }


  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                    SLOT OBJECT METHOD                         *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

  FT_LOCAL_DEF( FT_Error )
  pfr_slot_init( FT_GlyphSlot  pfrslot )        /* PFR_Slot */
  {
    PFR_Slot        slot   = (PFR_Slot)pfrslot;
    FT_GlyphLoader  loader = pfrslot->internal->loader;


    pfr_glyph_init( &slot->glyph, loader );

    return 0;
  }


  FT_LOCAL_DEF( void )
  pfr_slot_done( FT_GlyphSlot  pfrslot )        /* PFR_Slot */
  {
    PFR_Slot  slot = (PFR_Slot)pfrslot;