godot/thirdparty/freetype/src/cff/cffgload.c

/****************************************************************************
 *
 * cffgload.c
 *
 *   OpenType Glyph Loader (body).
 *
 * Copyright (C) 1996-2023 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 <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include <freetype/internal/sfnt.h>
#include <freetype/internal/ftcalc.h>
#include <freetype/internal/psaux.h>
#include <freetype/ftoutln.h>
#include <freetype/ftdriver.h>

#include "cffload.h"
#include "cffgload.h"

#include "cfferrs.h"

#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
#define IS_DEFAULT_INSTANCE( _face ) …
#else
#define IS_DEFAULT_INSTANCE …
#endif


  /**************************************************************************
   *
   * 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 …


  FT_LOCAL_DEF( FT_Error )
  cff_get_glyph_data( TT_Face    face,
                      FT_UInt    glyph_index,
                      FT_Byte**  pointer,
                      FT_ULong*  length )
  { … }


  FT_LOCAL_DEF( void )
  cff_free_glyph_data( TT_Face    face,
                       FT_Byte**  pointer,
                       FT_ULong   length )
  { … }


  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/
  /**********                                                      *********/
  /**********                                                      *********/
  /**********            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.                                         *********/
  /**********                                                      *********/
  /*************************************************************************/
  /*************************************************************************/
  /*************************************************************************/


#if 0 /* unused until we support pure CFF fonts */


  FT_LOCAL_DEF( FT_Error )
  cff_compute_max_advance( TT_Face  face,
                           FT_Int*  max_advance )
  {
    FT_Error     error = FT_Err_Ok;
    CFF_Decoder  decoder;
    FT_Int       glyph_index;
    CFF_Font     cff = (CFF_Font)face->other;

    PSAux_Service            psaux         = (PSAux_Service)face->psaux;
    const CFF_Decoder_Funcs  decoder_funcs = psaux->cff_decoder_funcs;


    *max_advance = 0;

    /* Initialize load decoder */
    decoder_funcs->init( &decoder, face, 0, 0, 0, 0, 0, 0 );

    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++ )
    {
      FT_Byte*  charstring;
      FT_ULong  charstring_len;


      /* now get load the unscaled outline */
      error = cff_get_glyph_data( face, glyph_index,
                                  &charstring, &charstring_len );
      if ( !error )
      {
        error = decoder_funcs->prepare( &decoder, size, glyph_index );
        if ( !error )
          error = decoder_funcs->parse_charstrings_old( &decoder,
                                                        charstring,
                                                        charstring_len,
                                                        0 );

        cff_free_glyph_data( face, &charstring, &charstring_len );
      }

      /* ignore the error if one has occurred -- skip to next glyph */
      error = FT_Err_Ok;
    }

    *max_advance = decoder.builder.advance.x;

    return FT_Err_Ok;
  }


#endif /* 0 */


  FT_LOCAL_DEF( FT_Error )
  cff_slot_load( CFF_GlyphSlot  glyph,
                 CFF_Size       size,
                 FT_UInt        glyph_index,
                 FT_Int32       load_flags )
  { … }


/* END */