godot/thirdparty/freetype/src/cid/cidgload.c

/****************************************************************************
 *
 * cidgload.c
 *
 *   CID-keyed Type1 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 "cidload.h"
#include "cidgload.h"
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include <freetype/ftoutln.h>
#include <freetype/internal/ftcalc.h>

#include <freetype/internal/psaux.h>
#include <freetype/internal/cfftypes.h>
#include <freetype/ftdriver.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 …


  /*
   * A helper function to compute FD number (`fd_select`), the offset to the
   * head of the glyph data (`off1`), and the offset to the and of the glyph
   * data (`off2`).
   *
   * The number how many times `cid_get_offset` is invoked can be controlled
   * by the number of non-NULL arguments.  If `fd_select` is non-NULL but
   * `off1` and `off2` are NULL, `cid_get_offset` is invoked only for
   * `fd_select`; `off1` and `off2` are not validated.
   *
   */
  FT_LOCAL_DEF( FT_Error )
  cid_compute_fd_and_offsets( CID_Face   face,
                              FT_UInt    glyph_index,
                              FT_ULong*  fd_select_p,
                              FT_ULong*  off1_p,
                              FT_ULong*  off2_p )
  { … }


  FT_CALLBACK_DEF( FT_Error )
  cid_load_glyph( T1_Decoder  decoder,
                  FT_UInt     glyph_index )
  { … }


#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;

    /* TODO: initialize decoder.len_buildchar and decoder.buildchar */
    /*       if we ever support CID-keyed multiple master fonts     */

    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 = FIXED_TO_INT( decoder.builder.advance.x );

    psaux->t1_decoder_funcs->done( &decoder );

    return FT_Err_Ok;
  }


#endif /* 0 */


  FT_LOCAL_DEF( FT_Error )
  cid_slot_load_glyph( FT_GlyphSlot  cidglyph,      /* CID_GlyphSlot */
                       FT_Size       cidsize,       /* CID_Size      */
                       FT_UInt       glyph_index,
                       FT_Int32      load_flags )
  { … }


/* END */