kc3-lang/freetype/src/type1z/z1gload.c

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• Hash : b8817177
  Author :
  Date : 2000-09-15T17:17:17
  

  small bug-fix, the linearHoriBearing value was not loaded not computed correctly

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• src/type1z/z1gload.c

• /***************************************************************************/
  /*                                                                         */
  /*  z1gload.c                                                              */
  /*                                                                         */
  /*    Experimental Type 1 Glyph Loader (body).                             */
  /*                                                                         */
  /*  Copyright 1996-2000 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.                                        */
  /*                                                                         */
  /***************************************************************************/
  
  
  #ifdef FT_FLAT_COMPILE
  
  #include "z1gload.h"
  
  #else
  
  #include <type1z/z1gload.h>
  
  #endif
  
  
  #include <freetype/internal/ftdebug.h>
  #include <freetype/internal/ftstream.h>
  #include <freetype/ftoutln.h>
  #include <freetype/internal/psaux.h>
  
  
  #include <string.h>     /* for strcmp() */
  
  
    /*************************************************************************/
    /*                                                                       */
    /* 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_z1gload
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /**********                                                      *********/
    /**********            COMPUTE THE MAXIMUM ADVANCE WIDTH         *********/
    /**********                                                      *********/
    /**********    The following code is in charge of computing      *********/
    /**********    the maximum advance width of the font.  It        *********/
    /**********    quickly processes each glyph charstring to        *********/
    /**********    extract the value from either a `sbw' or `seac'   *********/
    /**********    operator.                                         *********/
    /**********                                                      *********/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
  
    LOCAL_FUNC_X
    FT_Error  Z1_Parse_Glyph( T1_Decoder*  decoder,
                              FT_UInt      glyph_index )
    {
      T1_Face   face  = (T1_Face)decoder->builder.face;
      T1_Font*  type1 = &face->type1;
  
  
      decoder->font_matrix = type1->font_matrix;
      decoder->font_offset = type1->font_offset;
  
      return decoder->funcs.parse_charstrings(
                        decoder,
                        type1->charstrings    [glyph_index],
                        type1->charstrings_len[glyph_index] );
    }
  
  
    LOCAL_FUNC
    FT_Error  Z1_Compute_Max_Advance( T1_Face  face,
                                      FT_Int*  max_advance )
    {
      FT_Error          error;
      T1_Decoder        decoder;
      FT_Int            glyph_index;
      T1_Font*          type1 = &face->type1;
      PSAux_Interface*  psaux = (PSAux_Interface*)face->psaux;
  
  
      *max_advance = 0;
  
      /* initialize load decoder */
      error = psaux->t1_decoder_funcs->init( &decoder,
                                             (FT_Face)face,
                                             0, /* size       */
                                             0, /* glyph slot */
                                             (FT_Byte**)type1->glyph_names,
                                             face->blend,
                                             Z1_Parse_Glyph );
      if ( error )
        return error;
        
      decoder.builder.metrics_only = 1;
      decoder.builder.load_points  = 0;
  
      decoder.num_subrs = type1->num_subrs;
      decoder.subrs     = type1->subrs;
      decoder.subrs_len = type1->subrs_len;
  
      /* for each glyph, parse the glyph charstring and extract */
      /* the advance width                                      */
      for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
      {
        /* now get load the unscaled outline */
        error = Z1_Parse_Glyph( &decoder, glyph_index );
        /* ignore the error if one occured - skip to next glyph */
      }
  
      *max_advance = decoder.builder.advance.x;
      return FT_Err_Ok;
    }
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /**********                                                      *********/
    /**********               UNHINTED GLYPH LOADER                  *********/
    /**********                                                      *********/
    /**********    The following code is in charge of loading a      *********/
    /**********    single outline.  It completely ignores hinting    *********/
    /**********    and is used when FT_LOAD_NO_HINTING is set.       *********/
    /**********                                                      *********/
    /**********      The Type 1 hinter is located in `t1hint.c'      *********/
    /**********                                                      *********/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
  
    LOCAL_FUNC
    FT_Error  Z1_Load_Glyph( Z1_GlyphSlot  glyph,
                             Z1_Size       size,
                             FT_Int        glyph_index,
                             FT_Int        load_flags )
    {
      FT_Error                error;
      T1_Decoder              decoder;
      T1_Face                 face = (T1_Face)glyph->root.face;
      FT_Bool                 hinting;
      T1_Font*                type1         = &face->type1;
      PSAux_Interface*        psaux         = (PSAux_Interface*)face->psaux;
      const T1_Decoder_Funcs* decoder_funcs = psaux->t1_decoder_funcs;
  
      FT_Matrix               font_matrix;
      FT_Vector               font_offset;
  
      if ( load_flags & FT_LOAD_NO_RECURSE )
        load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
  
      glyph->x_scale = size->root.metrics.x_scale;
      glyph->y_scale = size->root.metrics.y_scale;
  
      glyph->root.outline.n_points   = 0;
      glyph->root.outline.n_contours = 0;
      
      hinting = ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
                ( load_flags & FT_LOAD_NO_HINTING ) == 0;
  
      glyph->root.format = ft_glyph_format_outline;
  
      error = decoder_funcs->init( &decoder,
                                   (FT_Face)face,
                                   (FT_Size)size,
                                   (FT_GlyphSlot)glyph,
                                   (FT_Byte**)type1->glyph_names,
                                   face->blend,
                                   Z1_Parse_Glyph );
      if ( error )
        goto Exit;
                        
      decoder.builder.no_recurse = ( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 );
  
      decoder.num_subrs = type1->num_subrs;
      decoder.subrs     = type1->subrs;
      decoder.subrs_len = type1->subrs_len;
     
  
      /* now load the unscaled outline */
      error = Z1_Parse_Glyph( &decoder, glyph_index );
      if ( error )
        goto Exit;
  
      font_matrix = decoder.font_matrix;
      font_offset = decoder.font_offset;
  
      /* save new glyph tables */
      decoder_funcs->done( &decoder );
  
      /* now, set the metrics -- this is rather simple, as   */
      /* the left side bearing is the xMin, and the top side */
      /* bearing the yMax                                    */
      if ( !error )
      {
        glyph->root.outline.flags &= ft_outline_owner;
        glyph->root.outline.flags |= ft_outline_reverse_fill;
        
        /* for composite glyphs, return only left side bearing and */
        /* advance width                                           */
        if ( load_flags & FT_LOAD_NO_RECURSE )
        {
          glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
          glyph->root.metrics.horiAdvance  = decoder.builder.advance.x;
        }
        else
        {
          FT_BBox            cbox;
          FT_Glyph_Metrics*  metrics = &glyph->root.metrics;
  
  
          /* copy the _unscaled_ advance width */
          metrics->horiAdvance          = decoder.builder.advance.x;
          glyph->root.linearHoriAdvance = decoder.builder.advance.x;
  
          /* make up vertical metrics */
          metrics->vertBearingX = 0;
          metrics->vertBearingY = 0;
          metrics->vertAdvance  = 0;
  
          glyph->root.linearVertAdvance = 0;
  
          glyph->root.format = ft_glyph_format_outline;
  
          if ( size && size->root.metrics.y_ppem < 24 )
            glyph->root.outline.flags |= ft_outline_high_precision;
  
          /* apply the font matrix */
          FT_Outline_Transform( &glyph->root.outline, &font_matrix );
  
          FT_Outline_Translate( &glyph->root.outline,
                                font_offset.x,
                                font_offset.y );
  
  #if 0
  
          glyph->root.outline.second_pass    = TRUE;
          glyph->root.outline.high_precision = size->root.metrics.y_ppem < 24;
          glyph->root.outline.dropout_mode   = 2;
  
  #endif /* 0 */
  
          if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
          {
            /* scale the outline and the metrics */
            FT_Int       n;
            FT_Outline*  cur = decoder.builder.base;
            FT_Vector*   vec = cur->points;
            FT_Fixed     x_scale = glyph->x_scale;
            FT_Fixed     y_scale = glyph->y_scale;
  
  
            /* First of all, scale the points */
            for ( n = cur->n_points; n > 0; n--, vec++ )
            {
              vec->x = FT_MulFix( vec->x, x_scale );
              vec->y = FT_MulFix( vec->y, y_scale );
            }
  
            FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
  
            /* Then scale the metrics */
            metrics->horiAdvance  = FT_MulFix( metrics->horiAdvance,  x_scale );
            metrics->vertAdvance  = FT_MulFix( metrics->vertAdvance,  y_scale );
  
            metrics->vertBearingX = FT_MulFix( metrics->vertBearingX, x_scale );
            metrics->vertBearingY = FT_MulFix( metrics->vertBearingY, y_scale );
          }
  
          /* compute the other metrics */
          FT_Outline_Get_CBox( &glyph->root.outline, &cbox );
  
          /* grid fit the bounding box if necessary */
          if ( hinting )
          {
            cbox.xMin &= -64;
            cbox.yMin &= -64;
            cbox.xMax  = ( cbox.xMax+63 ) & -64;
            cbox.yMax  = ( cbox.yMax+63 ) & -64;
          }
  
          metrics->width  = cbox.xMax - cbox.xMin;
          metrics->height = cbox.yMax - cbox.yMin;
  
          metrics->horiBearingX = cbox.xMin;
          metrics->horiBearingY = cbox.yMax;
        }
      }
  
    Exit:
      return error;
    }
  
  
  /* END */
  

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