kc3-lang/freetype/src/pfr/pfrobjs.c

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• Hash : fed59b7c
  Author :
  Date : 2002-07-17T22:51:06
  

  * src/sfnt/ttload.c (TT_Load_SFNT_Header): fixed a recent bug that prevented OpenType fonts to be recognized by FreeType

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• src/pfr/pfrobjs.c

• /***************************************************************************/
  /*                                                                         */
  /*  pfrobjs.c                                                              */
  /*                                                                         */
  /*    FreeType PFR object methods (body).                                  */
  /*                                                                         */
  /*  Copyright 2002 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 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( PFR_Face  face )
    {
      /* 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_LOCAL_DEF( FT_Error )
    pfr_face_init( FT_Stream  stream,
                   PFR_Face   face,
                   FT_Int     face_index )
    {
      FT_Error  error;
  
  
      /* 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;
  
        face->root.num_faces = num_faces;
      }
  
      if ( face_index < 0 )
        goto Exit;
  
      if ( face_index >= face->root.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 */
       {
         FT_Face      root     = FT_FACE( face );
         PFR_PhyFont  phy_font = &face->phy_font;
  
  
         root->face_index = face_index;
         root->num_glyphs = phy_font->num_chars;
         root->face_flags = FT_FACE_FLAG_SCALABLE;
  
         if ( (phy_font->flags & PFR_PHY_PROPORTIONAL) == 0 )
           root->face_flags |= FT_FACE_FLAG_FIXED_WIDTH;
  
         if ( phy_font->flags & PFR_PHY_VERTICAL )
           root->face_flags |= FT_FACE_FLAG_VERTICAL;
         else
           root->face_flags |= FT_FACE_FLAG_HORIZONTAL;
  
         /* XXX: kerning and embedded bitmap support isn't there yet */
  
         root->family_name = phy_font->font_id;
         root->style_name  = NULL;  /* no style name in font file */
  
         root->num_fixed_sizes = 0;
         root->available_sizes = 0;
  
         root->bbox         = phy_font->bbox;
         root->units_per_EM = (FT_UShort)phy_font->outline_resolution;
         root->ascender     = (FT_Short) phy_font->bbox.yMax;
         root->descender    = (FT_Short) phy_font->bbox.yMin;
         root->height       = (FT_Short)
                                ( ( ( root->ascender - root->descender ) * 12 )
                                  / 10 );
  
         /* now compute maximum advance width */
         if ( ( phy_font->flags & PFR_PHY_PROPORTIONAL ) == 0 )
           root->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;
           }
  
           root->max_advance_width = (FT_Short)max;
         }
  
         root->max_advance_height = root->height;
  
         root->underline_position  = (FT_Short)( - root->units_per_EM / 10 );
         root->underline_thickness = (FT_Short)(   root->units_per_EM / 30 );
  
         /* create charmap */
         {
           FT_CharMapRec  charmap;
  
  
           charmap.face        = root;
           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 (root->num_charmaps)
             root->charmap = root->charmaps[0];
  #endif
         }
  
         /* check whether we've loaded any kerning pairs */
         if ( phy_font->num_kern_pairs )
           root->face_flags |= FT_FACE_FLAG_KERNING;
       }
  
    Exit:
      return error;
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                    SLOT OBJECT METHOD                         *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
    FT_LOCAL_DEF( FT_Error )
    pfr_slot_init( PFR_Slot  slot )
    {
      FT_GlyphLoader  loader = slot->root.internal->loader;
  
      pfr_glyph_init( &slot->glyph, loader );
  
      return 0;
    }
  
  
    FT_LOCAL_DEF( void )
    pfr_slot_done( PFR_Slot  slot )
    {
      pfr_glyph_done( &slot->glyph );
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    pfr_slot_load( PFR_Slot  slot,
                   PFR_Size  size,
                   FT_UInt   gindex,
                   FT_Int    load_flags )
    {
      FT_Error     error;
      PFR_Face     face    = (PFR_Face)slot->root.face;
      PFR_Char     gchar;
      FT_Outline*  outline = &slot->root.outline;
      FT_ULong     gps_offset;
  
      if (gindex > 0)
        gindex--;
  
      /* check that the glyph index is correct */
      FT_ASSERT( gindex < face->phy_font.num_chars );
  
      gchar               = face->phy_font.chars + gindex;
      slot->root.format   = ft_glyph_format_outline;
      outline->n_points   = 0;
      outline->n_contours = 0;
      gps_offset          = face->header.gps_section_offset;
  
      /* load the glyph outline (FT_LOAD_NO_RECURSE isn't supported) */
      error = pfr_glyph_load( &slot->glyph, face->root.stream,
                              gps_offset, gchar->gps_offset, gchar->gps_size );
  
      if ( !error )
      {
        FT_BBox            cbox;
        FT_Glyph_Metrics*  metrics = &slot->root.metrics;
        FT_Pos             advance;
        FT_Int             em_metrics, em_outline;
        FT_Bool            scaling;
  
  
        scaling = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 );
  
        /* copy outline data */
        *outline = slot->glyph.loader->base.outline;
  
        outline->flags &= ~ft_outline_owner;
        outline->flags |= ft_outline_reverse_fill;
  
        if ( size && size->root.metrics.y_ppem < 24 )
          outline->flags |= ft_outline_high_precision;
  
        /* compute the advance vector */
        metrics->horiAdvance = 0;
        metrics->vertAdvance = 0;
  
        advance    = gchar->advance;
        em_metrics = face->phy_font.metrics_resolution;
        em_outline = face->phy_font.outline_resolution;
  
        if ( em_metrics != em_outline )
          advance = FT_MulDiv( advance, em_outline, em_metrics );
  
        if ( face->phy_font.flags & PFR_PHY_VERTICAL )
          metrics->vertAdvance = advance;
        else
          metrics->horiAdvance = advance;
  
        slot->root.linearHoriAdvance = metrics->horiAdvance;
        slot->root.linearVertAdvance = metrics->vertAdvance;
  
        /* make-up vertical metrics(?) */
        metrics->vertBearingX = 0;
        metrics->vertBearingY = 0;
  
        /* scale when needed */
        if ( scaling )
        {
          FT_Int      n;
          FT_Fixed    x_scale = size->root.metrics.x_scale;
          FT_Fixed    y_scale = size->root.metrics.y_scale;
          FT_Vector*  vec     = outline->points;
  
  
          /* scale outline points */
          for ( n = 0; n < outline->n_points; n++, vec++ )
          {
            vec->x = FT_MulFix( vec->x, x_scale );
            vec->y = FT_MulFix( vec->y, y_scale );
          }
  
          /* scale the advance */
          metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
          metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
        }
  
        /* compute the rest of the metrics */
        FT_Outline_Get_CBox( outline, &cbox );
  
        metrics->width        = cbox.xMax - cbox.xMin;
        metrics->height       = cbox.yMax - cbox.yMin;
        metrics->horiBearingX = cbox.xMin;
        metrics->horiBearingY = cbox.yMax - metrics->height;
      }
  
      return error;
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*****                                                               *****/
    /*****                      KERNING METHOD                           *****/
    /*****                                                               *****/
    /*************************************************************************/
    /*************************************************************************/
  
    /* XXX: This relies on the font being spec-conformant, i.e., that the
            kerning pairs are sorted.  We might want to sort it just to make
            sure */
  
  #undef  PFR_KERN_INDEX
  #define PFR_KERN_INDEX( g1, g2 )  ( ( (FT_ULong)g1 << 16 ) | g2 )
  
    /* find the kerning for a given glyph pair */
    FT_LOCAL_DEF( FT_Error )
    pfr_face_get_kerning( PFR_Face    face,
                          FT_UInt     glyph1,
                          FT_UInt     glyph2,
                          FT_Vector*  kerning )
    {
      PFR_PhyFont   phy_font = &face->phy_font;
      PFR_KernPair  min, mid, max;
      FT_ULong      idx = PFR_KERN_INDEX( glyph1, glyph2 );
  
  
      /* simple binary search */
      min = phy_font->kern_pairs;
      max = min + phy_font->num_kern_pairs;
  
      while ( min < max )
      {
        FT_ULong  midi;
  
  
        mid  = min + ( max - min ) / 2;
        midi = PFR_KERN_INDEX( mid->glyph1, mid->glyph2 );
  
        if ( midi == idx )
        {
          *kerning = mid->kerning;
          goto Exit;
        }
  
        if ( midi < idx )
          min = mid + 1;
        else
          max = mid;
      }
  
      kerning->x = 0;
      kerning->y = 0;
  
    Exit:
      return 0;
    }
  
  /* END */
  

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