1  /*
       2   * Copyright © 2009, 2023  Red Hat, Inc.
       3   * Copyright © 2015  Google, Inc.
       4   *
       5   * Permission is hereby granted, without written agreement and without
       6   * license or royalty fees, to use, copy, modify, and distribute this
       7   * software and its documentation for any purpose, provided that the
       8   * above copyright notice and the following two paragraphs appear in
       9   * all copies of this software.
      10   *
      11   * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
      12   * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
      13   * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
      14   * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
      15   * DAMAGE.
      16   *
      17   * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
      18   * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
      19   * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
      20   * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
      21   * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
      22   *
      23   * Red Hat Author(s): Behdad Esfahbod, Matthias Clasen
      24   * Google Author(s): Behdad Esfahbod
      25   */
      26  
      27  #include <freetype/freetype.h>
      28  #include <freetype/tttables.h>
      29  
      30  #ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
      31  
      32  #include "ft-hb.h"
      33  
      34  /* The following three functions are a more or less verbatim
      35   * copy of corresponding HarfBuzz code from hb-ft.cc
      36   */
      37  
      38  static hb_blob_t *
      39  hb_ft_reference_table_ (hb_face_t *face, hb_tag_t tag, void *user_data)
      40  {
      41    FT_Face ft_face = (FT_Face) user_data;
      42    FT_Byte *buffer;
      43    FT_ULong  length = 0;
      44    FT_Error error;
      45  
      46    FT_UNUSED (face);
      47  
      48    /* Note: FreeType like HarfBuzz uses the NONE tag for fetching the entire blob */
      49  
      50    error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);
      51    if (error)
      52      return NULL;
      53  
      54    buffer = (FT_Byte *) ft_smalloc (length);
      55    if (!buffer)
      56      return NULL;
      57  
      58    error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length);
      59    if (error)
      60    {
      61      free (buffer);
      62      return NULL;
      63    }
      64  
      65    return hb_blob_create ((const char *) buffer, length,
      66                           HB_MEMORY_MODE_WRITABLE,
      67                           buffer, ft_sfree);
      68  }
      69  
      70  static hb_face_t *
      71  hb_ft_face_create_ (FT_Face           ft_face,
      72                      hb_destroy_func_t destroy)
      73  {
      74    hb_face_t *face;
      75  
      76    if (!ft_face->stream->read) {
      77      hb_blob_t *blob;
      78  
      79      blob = hb_blob_create ((const char *) ft_face->stream->base,
      80                             (unsigned int) ft_face->stream->size,
      81                             HB_MEMORY_MODE_READONLY,
      82                             ft_face, destroy);
      83      face = hb_face_create (blob, ft_face->face_index);
      84      hb_blob_destroy (blob);
      85    } else {
      86      face = hb_face_create_for_tables (hb_ft_reference_table_, ft_face, destroy);
      87    }
      88  
      89    hb_face_set_index (face, ft_face->face_index);
      90    hb_face_set_upem (face, ft_face->units_per_EM);
      91  
      92    return face;
      93  }
      94  
      95  FT_LOCAL_DEF(hb_font_t *)
      96  hb_ft_font_create_ (FT_Face           ft_face,
      97                      hb_destroy_func_t destroy)
      98  {
      99    hb_font_t *font;
     100    hb_face_t *face;
     101  
     102    face = hb_ft_face_create_ (ft_face, destroy);
     103    font = hb_font_create (face);
     104    hb_face_destroy (face);
     105    return font;
     106  }
     107  
     108  #else /* !FT_CONFIG_OPTION_USE_HARFBUZZ */
     109  
     110  /* ANSI C doesn't like empty source files */
     111  typedef int  ft_hb_dummy_;
     112  
     113  #endif /* !FT_CONFIG_OPTION_USE_HARFBUZZ */
     114  
     115  /* END */