kc3-lang/freetype/src/cid/cidgload.c

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• Hash : 46960df7
  Author :
  Date : 2003-02-13T17:49:27
  

  The incremental interface now passes the old metrics when asking for replacement metrics so that they can be modified, not just replaced. For example, CFF fonts need this.

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• src/cid/cidgload.c

• /***************************************************************************/
  /*                                                                         */
  /*  cidgload.c                                                             */
  /*                                                                         */
  /*    CID-keyed Type1 Glyph Loader (body).                                 */
  /*                                                                         */
  /*  Copyright 1996-2001, 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 <ft2build.h>
  #include "cidload.h"
  #include "cidgload.h"
  #include FT_INTERNAL_DEBUG_H
  #include FT_INTERNAL_STREAM_H
  #include FT_OUTLINE_H
  
  #include "ciderrs.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_cidgload
  
  
    FT_CALLBACK_DEF( FT_Error )
    cid_load_glyph( T1_Decoder  decoder,
                    FT_UInt     glyph_index )
    {
      CID_Face      face = (CID_Face)decoder->builder.face;
      CID_FaceInfo  cid  = &face->cid;
      FT_Byte*      p;
      FT_UInt       fd_select;
      FT_Stream     stream = face->root.stream;
      FT_Error      error  = 0;
      FT_Byte*      charstring = 0;
      FT_Memory     memory = face->root.memory;
      FT_UInt       glyph_length = 0;
  
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
  
      /* For incremental fonts get the character data using */
      /* the callback function.                             */
      if ( face->root.internal->incremental_interface )
      {
        FT_Data  glyph_data;
  
  
        error = face->root.internal->incremental_interface->funcs->get_glyph_data(
                  face->root.internal->incremental_interface->object,
                  glyph_index,
                  &glyph_data );
        if ( error )
          goto Exit;
  
        p         = (FT_Byte*)glyph_data.pointer;
        fd_select = (FT_UInt)cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
  
        if ( glyph_data.length != 0 )
        {
          glyph_length = glyph_data.length - cid->fd_bytes;
          FT_ALLOC( charstring, glyph_length );
          if ( !error )
            ft_memcpy( charstring, glyph_data.pointer + cid->fd_bytes,
                       glyph_length );
        }
  
        face->root.internal->incremental_interface->funcs->free_glyph_data(
                  face->root.internal->incremental_interface->object,
                  &glyph_data );
  
        if ( error )
          goto Exit;
      }
  
      else
  
  #endif /* FT_CONFIG_OPTION_INCREMENTAL */
  
      /* For ordinary fonts read the CID font dictionary index */
      /* and charstring offset from the CIDMap.                */
      {
        FT_UInt   entry_len = cid->fd_bytes + cid->gd_bytes;
        FT_ULong  off1;
  
  
        if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset +
                             glyph_index * entry_len )               ||
             FT_FRAME_ENTER( 2 * entry_len )                         )
          goto Exit;
  
        p            = (FT_Byte*)stream->cursor;
        fd_select    = (FT_UInt) cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
        off1         = (FT_ULong)cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
        p           += cid->fd_bytes;
        glyph_length = (FT_UInt) cid_get_offset(
                                   &p, (FT_Byte)cid->gd_bytes ) - off1;
        FT_FRAME_EXIT();
  
        if ( glyph_length == 0 )
          goto Exit;
        if ( FT_ALLOC( charstring, glyph_length ) )
          goto Exit;
        if ( FT_STREAM_READ_AT( cid->data_offset + off1,
                                charstring, glyph_length ) )
          goto Exit;
      }
  
      /* Now set up the subrs array and parse the charstrings. */
      {
        CID_FaceDict  dict;
        CID_Subrs     cid_subrs = face->subrs + fd_select;
        FT_Int        cs_offset;
  
  
        /* Set up subrs */
        decoder->num_subrs = cid_subrs->num_subrs;
        decoder->subrs     = cid_subrs->code;
        decoder->subrs_len = 0;
  
        /* Set up font matrix */
        dict                 = cid->font_dicts + fd_select;
  
        decoder->font_matrix = dict->font_matrix;
        decoder->font_offset = dict->font_offset;
        decoder->lenIV       = dict->private_dict.lenIV;
  
        /* Decode the charstring. */
  
        /* Adjustment for seed bytes. */
        cs_offset = ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );
  
        /* Decrypt only if lenIV >= 0. */
        if ( decoder->lenIV >= 0 )
          cid_decrypt( charstring, glyph_length, 4330 );
  
        error = decoder->funcs.parse_charstrings( decoder,
                                                  charstring + cs_offset,
                                                  glyph_length - cs_offset  );
      }
  
      FT_FREE( charstring );
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
  
      /* Incremental fonts can optionally override the metrics. */
      if ( !error                                       &&
           face->root.internal->incremental_interface   &&
           face->root.internal->incremental_interface->funcs->get_glyph_metrics )
      {
        FT_Incremental_MetricsRec  metrics;
  
        metrics.bearing_x = decoder->builder.left_bearing.x;
  	  metrics.bearing_y = decoder->builder.left_bearing.y;
  	  metrics.advance   = decoder->builder.advance.x;
        error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
                  face->root.internal->incremental_interface->object,
                  glyph_index, FALSE, &metrics );
        decoder->builder.left_bearing.x = metrics.bearing_x;
        decoder->builder.left_bearing.y = metrics.bearing_y;
        decoder->builder.advance.x      = metrics.advance;
        decoder->builder.advance.y      = 0;
      }
  
  #endif /* FT_CONFIG_OPTION_INCREMENTAL */
  
    Exit:
      return error;
    }
  
  
  #if 0
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /**********                                                      *********/
    /**********                                                      *********/
    /**********            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.                                         *********/
    /**********                                                      *********/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
  
    FT_LOCAL_DEF( FT_Error )
    cid_face_compute_max_advance( CID_Face  face,
                                  FT_Int*   max_advance )
    {
      FT_Error       error;
      T1_DecoderRec  decoder;
      FT_Int         glyph_index;
  
      PSAux_Service  psaux = (PSAux_Service)face->psaux;
  
  
      *max_advance = 0;
  
      /* Initialize load decoder */
      error = psaux->t1_decoder_funcs->init( &decoder,
                                             (FT_Face)face,
                                             0, /* size       */
                                             0, /* glyph slot */
                                             0, /* glyph names! XXX */
                                             0, /* blend == 0 */
                                             0, /* hinting == 0 */
                                             cid_load_glyph );
      if ( error )
        return error;
  
      decoder.builder.metrics_only = 1;
      decoder.builder.load_points  = 0;
  
      /* for each glyph, parse the glyph charstring and extract */
      /* the advance width                                      */
      for ( glyph_index = 0; glyph_index < face->root.num_glyphs;
            glyph_index++ )
      {
        /* now get load the unscaled outline */
        error = cid_load_glyph( &decoder, glyph_index );
        /* ignore the error if one occurred - skip to next glyph */
      }
  
      *max_advance = decoder.builder.advance.x;
  
      return CID_Err_Ok;
    }
  
  
  #endif /* 0 */
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /**********                                                      *********/
    /**********                                                      *********/
    /**********               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.       *********/
    /**********                                                      *********/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
  
    FT_LOCAL_DEF( FT_Error )
    cid_slot_load_glyph( CID_GlyphSlot  glyph,
                         CID_Size       size,
                         FT_Int         glyph_index,
                         FT_Int32       load_flags )
    {
      FT_Error       error;
      T1_DecoderRec  decoder;
      CID_Face       face = (CID_Face)glyph->root.face;
      FT_Bool        hinting;
  
      PSAux_Service  psaux = (PSAux_Service)face->psaux;
      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 = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
                         ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
  
      glyph->root.format = FT_GLYPH_FORMAT_OUTLINE;
  
      {
        error = psaux->t1_decoder_funcs->init( &decoder,
                                               (FT_Face)face,
                                               (FT_Size)size,
                                               (FT_GlyphSlot)glyph,
                                               0, /* glyph names -- XXX */
                                               0, /* blend == 0 */
                                               hinting,
                                               FT_LOAD_TARGET_MODE(load_flags),
                                               cid_load_glyph );
  
        /* set up the decoder */
        decoder.builder.no_recurse = FT_BOOL(
          ( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 ) );
  
        error = cid_load_glyph( &decoder, glyph_index );
  
        font_matrix = decoder.font_matrix;
        font_offset = decoder.font_offset;
  
        /* save new glyph tables */
        psaux->t1_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 )
        {
          FT_Slot_Internal  internal = glyph->root.internal;
  
  
          glyph->root.metrics.horiBearingX = decoder.builder.left_bearing.x;
          glyph->root.metrics.horiAdvance  = decoder.builder.advance.x;
  
          internal->glyph_matrix         = font_matrix;
          internal->glyph_delta          = font_offset;
          internal->glyph_transformed    = 1;
        }
        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;
          glyph->root.internal->glyph_transformed = 0;
  
          /* 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 ( ( 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 */
            if ( !hinting )
              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 );
  
            if ( hinting )
            {
              metrics->horiAdvance = ( metrics->horiAdvance + 32 ) & -64;
              metrics->vertAdvance = ( metrics->vertAdvance + 32 ) & -64;
  
              metrics->vertBearingX = ( metrics->vertBearingX + 32 ) & -64;
              metrics->vertBearingY = ( metrics->vertBearingY + 32 ) & -64;
            }
          }
  
          /* 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;
        }
      }
      return error;
    }
  
  
  /* END */
  

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