kc3-lang/freetype/src/type1/t1gload.c

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• Hash : e52c4ba1
  Author :
  Date : 2003-08-06T17:27:14
  

  * src/type1/t1gload.c (T1_Load_Glyph), src/cff/cffgload.c (cff_slot_load), src/cid/cidgload.c (cid_slot_load_glyph): Fix previous change.

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• src/type1/t1gload.c

• /***************************************************************************/
  /*                                                                         */
  /*  t1gload.c                                                              */
  /*                                                                         */
  /*    Type 1 Glyph Loader (body).                                          */
  /*                                                                         */
  /*  Copyright 1996-2001, 2002, 2003 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 "t1gload.h"
  #include FT_INTERNAL_DEBUG_H
  #include FT_INTERNAL_STREAM_H
  #include FT_OUTLINE_H
  #include FT_INTERNAL_POSTSCRIPT_AUX_H
  
  #include "t1errors.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_t1gload
  
  
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
    /**********                                                      *********/
    /**********            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 )
    T1_Parse_Glyph_And_Get_Char_String( T1_Decoder  decoder,
                                        FT_UInt     glyph_index,
                                        FT_Data*    char_string )
    {
      T1_Face   face  = (T1_Face)decoder->builder.face;
      T1_Font   type1 = &face->type1;
      FT_Error  error = 0;
  
  
      decoder->font_matrix = type1->font_matrix;
      decoder->font_offset = type1->font_offset;
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
  
      /* For incremental fonts get the character data using the */
      /* callback function.                                     */
      if ( face->root.internal->incremental_interface )
        error = face->root.internal->incremental_interface->funcs->get_glyph_data(
                  face->root.internal->incremental_interface->object,
                  glyph_index, char_string );
      else
  
  #endif /* FT_CONFIG_OPTION_INCREMENTAL */
  
      /* For ordinary fonts get the character data stored in the face record. */
      {
        char_string->pointer = type1->charstrings[glyph_index];
        char_string->length  = type1->charstrings_len[glyph_index];
      }
  
      if ( !error )
        error = decoder->funcs.parse_charstrings(
                  decoder, (FT_Byte*)char_string->pointer,
                  char_string->length );
  
  #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 */
  
    return error;
    }
  
  
    FT_CALLBACK_DEF( FT_Error )
    T1_Parse_Glyph( T1_Decoder  decoder,
                    FT_UInt     glyph_index )
    {
      FT_Data   glyph_data;
      FT_Error  error = T1_Parse_Glyph_And_Get_Char_String( 
                          decoder, glyph_index, &glyph_data );
  
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
      if ( !error )
      {
        T1_Face  face = (T1_Face)decoder->builder.face;
  
  
        if ( face->root.internal->incremental_interface )
          face->root.internal->incremental_interface->funcs->free_glyph_data(
            face->root.internal->incremental_interface->object,
            &glyph_data );
      }
  #endif /* FT_CONFIG_OPTION_INCREMENTAL */
  
      return error;
    }
  
  
    FT_LOCAL_DEF( FT_Error )
    T1_Compute_Max_Advance( T1_Face  face,
                            FT_Pos*  max_advance )
    {
      FT_Error       error;
      T1_DecoderRec  decoder;
      FT_Int         glyph_index;
      T1_Font        type1 = &face->type1;
      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 */
                                             (FT_Byte**)type1->glyph_names,
                                             face->blend,
                                             0,
                                             FT_RENDER_MODE_NORMAL,
                                             T1_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;
  
      *max_advance = 0;
  
      /* 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 = T1_Parse_Glyph( &decoder, glyph_index );
        if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance )
          *max_advance = decoder.builder.advance.x;
          
        /* ignore the error if one occurred - skip to next glyph */
      }
  
      return T1_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'      *********/
    /**********                                                      *********/
    /*************************************************************************/
    /*************************************************************************/
    /*************************************************************************/
  
  
    FT_LOCAL_DEF( FT_Error )
    T1_Load_Glyph( T1_GlyphSlot  glyph,
                   T1_Size       size,
                   FT_UInt       glyph_index,
                   FT_Int32      load_flags )
    {
      FT_Error                error;
      T1_DecoderRec           decoder;
      T1_Face                 face = (T1_Face)glyph->root.face;
      FT_Bool                 hinting;
      T1_Font                 type1         = &face->type1;
      PSAux_Service           psaux         = (PSAux_Service)face->psaux;
      const T1_Decoder_Funcs  decoder_funcs = psaux->t1_decoder_funcs;
  
      FT_Matrix               font_matrix;
      FT_Vector               font_offset;
      FT_Data                 glyph_data;
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
      FT_Bool                 glyph_data_loaded = 0;
  #endif
  
  
      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 = decoder_funcs->init( &decoder,
                                   (FT_Face)face,
                                   (FT_Size)size,
                                   (FT_GlyphSlot)glyph,
                                   (FT_Byte**)type1->glyph_names,
                                   face->blend,
                                   FT_BOOL( hinting ),
                                   FT_LOAD_TARGET_MODE(load_flags),
                                   T1_Parse_Glyph );
      if ( error )
        goto Exit;
  
      decoder.builder.no_recurse = FT_BOOL(
                                     ( 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 = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index,
                                                  &glyph_data );
      if ( error )
        goto Exit;
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
      glyph_data_loaded = 1;
  #endif
  
      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 )
        {
          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;
          FT_Vector          advance;
  
  
          /* 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;
  
  #if 1
          /* apply the font matrix, if any */
          FT_Outline_Transform( &glyph->root.outline, &font_matrix );
  
          FT_Outline_Translate( &glyph->root.outline,
                                font_offset.x,
                                font_offset.y );
  
          advance.x = metrics->horiAdvance;
          advance.y = 0;
          FT_Vector_Transform( &advance, &font_matrix );
          metrics->horiAdvance = advance.x + font_offset.x;
          advance.x = 0;
          advance.y = metrics->vertAdvance;
          FT_Vector_Transform( &advance, &font_matrix );
          metrics->vertAdvance = advance.y + font_offset.y;
  #endif
  
          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 we are not hinting */
            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;
        }
  
        /* Set control data to the glyph charstrings.  Note that this is */
        /* _not_ zero-terminated.                                        */
        glyph->root.control_data = (FT_Byte*)glyph_data.pointer;
        glyph->root.control_len  = glyph_data.length;
      }
  
  
    Exit:
  
  #ifdef FT_CONFIG_OPTION_INCREMENTAL
      if ( glyph_data_loaded && face->root.internal->incremental_interface )
      {
        face->root.internal->incremental_interface->funcs->free_glyph_data(
          face->root.internal->incremental_interface->object,
          &glyph_data );
  
        /* Set the control data to null - it is no longer available if   */
        /* loaded incrementally.                                         */
        glyph->root.control_data = 0;
        glyph->root.control_len  = 0;
      }
  #endif
  
      return error;
    }
  
  
  /* END */
  

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